GNU bug report logs - #76428
[GCD PATCH] 003-set-search-paths-without-program-wrappers: Submit.

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To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Subject: Re: GCD 004 deliberation
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Ludovic Court=C3=A8s <ludo@HIDDEN> writes:

> Hello,
>
> =E5=AE=8B=E6=96=87=E6=AD=A6 <iyzsong@HIDDEN> skribis:
>
>> Hello, Below is the final version of GCD for "Set search paths without
>> program wrappers", which means now this GCD start its deliberation
>> period (14 days), so team members please reply to
>> <76428 <at> debbugs.gnu.org> with opinions.  Thanks!
>
> I just realized we=E2=80=99re already past the end of the deliberation.
>
> I believe only 1 team member deliberated (Florian Pelz: support).
> This is below the quorum of 25% of team members, so I believe this GCD
> is withdrawn.
>
> Could you update the =E2=80=98status=E2=80=99 and =E2=80=98date=E2=80=99 =
fields accordingly in the repo?
>
> It is disappointing that the proposal did not get more attention; we=E2=
=80=99ll
> have to assess to what extent this is due to the process itself.

I wonder if there should be a page on guix.gnu.org showing gcd and
start/end times, otherwise many people will forget about it.

>
> However I would recommend reaching out to more people, perhaps stripping
> it down to the essentials, and hopefully it can be resubmitted later
> once there=E2=80=99s a broader understanding of the stakes and consequenc=
es.
>
> Thanks for all the work,
> Ludo=E2=80=99.

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Message received at 76428 <at> debbugs.gnu.org:

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: =?utf-8?B?5a6L5paH5q2m?= <iyzsong@HIDDEN>
Subject: GCD 004 deliberation
In-Reply-To: <87a59hdskx.fsf@HIDDEN> (=?utf-8?B?IuWui+aWh+atpiIncw==?=
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Hello,

=E5=AE=8B=E6=96=87=E6=AD=A6 <iyzsong@HIDDEN> skribis:

> Hello, Below is the final version of GCD for "Set search paths without
> program wrappers", which means now this GCD start its deliberation
> period (14 days), so team members please reply to
> <76428 <at> debbugs.gnu.org> with opinions.  Thanks!

I just realized we=E2=80=99re already past the end of the deliberation.

I believe only 1 team member deliberated (Florian Pelz: support).
This is below the quorum of 25% of team members, so I believe this GCD
is withdrawn.

Could you update the =E2=80=98status=E2=80=99 and =E2=80=98date=E2=80=99 fi=
elds accordingly in the repo?

It is disappointing that the proposal did not get more attention; we=E2=80=
=99ll
have to assess to what extent this is due to the process itself.

However I would recommend reaching out to more people, perhaps stripping
it down to the essentials, and hopefully it can be resubmitted later
once there=E2=80=99s a broader understanding of the stakes and consequences.

Thanks for all the work,
Ludo=E2=80=99.

Message received at 76428 <at> debbugs.gnu.org:

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Subject: Re: [bug#76428] [GCD PATCH]
 003-set-search-paths-without-program-wrappers: Submit.
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Hello,

=E5=AE=8B=E6=96=87=E6=AD=A6 <iyzsong@HIDDEN> skribis:

> Yes, we introduced GUIX_PYTHONPATH, GUIX_GTK* to avoid ABI
> incompatibility problems between different programs from foreign systems
> and Guix systems.  But XDG_DATA_DIRS, as it's designed for shareable
> data files, won't have ABI incompatibility problems, and we rely on it
> for a foreign desktop launch to find applications (via desktop files),
> fonts installed from Guix.

(I hadn=E2=80=99t realized GUIX_GTK* and GUIX_GDK* already exist=E2=80=A6)

> So do we need 'GUIX_XDG_*'?  Well, In 'wrap-program' we can specifiy how
> the wrapped environment variables are going to be combined with the
> system level variables in 3 positions: prefix, suffix or =3D (exact).  The
> priority between wrapped and system level variables influence the
> robustness of programs.
>
> For plugins which might have ABI problems, we'll use 'prefix', so a
> wrapped program always load the correct ones (eg: qtbase) first, and
> hopefully they can ignore the possible incompatible ones (eg: a qt
> theme plugin) with reduced functions but still works.
>
> Or for not real search paths which only support a single directory or
> file, we'll use '=3D' (eg: SSL_CERT_FILE).
>
> But for XDG_DATA_DIRS and XDG_CONFIG_DIRS, we'll want to use 'suffix',
> so that the shared combined data (icons, mime databases) will be used
> instead of a seperated incomplete ones.  Also it allow user to customize
> them as usually, or 'guix home' or 'guix system' to custom them at
> profile level.

I understand this, but I=E2=80=99m not sure how it releases to GUIX_-prefix=
ing
more variables.

> In the specified search-paths.d implementation, for simplify reason, the
> envs from search-paths.d files are always used in 'prefix' way.  For '=3D'
> cases, we could patch it to a real search path (eg:
> GUIX_GDK_PIXBUF_MODULE_FILES), or hardcode it (eg:
> QTWEBENGINEPROCESS_PATH #75966).  For 'suffix' cases, it uses 2
> variables, that's prefer XDG_DATA_DIRS (set by profile or foreign
> system) over GUIX_XDG_DATA_DIRS (set by search-paths.d, not leaking).

Uh.  Having GUIX_XDG_DATA_DIRS at all sounds like a problem to me.

>>>   - `GUIX_INTERPRETER_FILE`: absolute file name of the interpreter
>>>   - `GUIX_MAIN_SCRIPT_FILE`: absolute file name of the script
>>
>> We won=E2=80=99t patch every interpreter out there, that=E2=80=99s not r=
easonable.
>
> Yes, python should be the most, also we can avoid patching and still use
> 'wrap-program' for them.

Hmm OK.

>> Overall, I think I=E2=80=99d be reassured if we reduced the scope a litt=
le bit:
>> don=E2=80=99t insist on the =E2=80=9CGUIX_=E2=80=9D prefix, focus on GTK=
 and Qt applications.
>
> Okay, I'll send GUIX_GIO_EXTRA_MODULES as a seperated patch later.  For
> 'GUIX_XDG_DATA_DIRS' and 'GUIX_XDG_CONFIG_DIRS', do you think the
> current implementation plan (GUIX_ ones only used by search-paths.d,
> only XDG_DATA_* still set by profile and visible, use 2 variables due to
> simplify reason) fine?

I=E2=80=99m not sure I fully understand what =E2=80=9Conly used by search-p=
aths.d=E2=80=9D
means; I would prefer not introducing any GUIX_-prefixed variable as
part of this work.  Adding these variables could be discussed
separately.

Thanks for explaining!

Ludo=E2=80=99.

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Subject: Re: [bug#76428] [GCD PATCH]
 003-set-search-paths-without-program-wrappers: Submit.
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On 2025-02-26 12:16, =E5=AE=8B=E6=96=87=E6=AD=A6 via Guix-patches via wrote:

> Ludovic Court=C3=A8s <ludo@HIDDEN> writes:
>
>>> [...]
>>> +Those search path configuration files would be created by the package =
builder,
>>> +after the `install` phase, replace usages of `wrap-program` when possi=
ble.
>>
>> One thought came to mind.
>>
>> If we are going to provide that sort of metadata along side package
>> build results, what about providing a =E2=80=98package=E2=80=99 sexp sim=
ilar to those
>> found in the =E2=80=98manifest=E2=80=99 file of profiles (see =E2=80=98m=
anifest->gexp=E2=80=99), for
>> example in =E2=80=98etc/guix/package=E2=80=99?
>
> Okay, I guess that can be done in gnu-build-system.
>
>>
>> The sexp could provide info such as: the package name and version, its
>> search paths, maybe its propagated inputs.

Just realised how great this can be.  It would be good for at least
Python to manage propagated-inputs this way, if doable!  If
search-paths.d already has all info about GUIX_PYTHONPATH, then we
probably won't need to install packages in the profile at all, we'll
just have to ensure that GUIX_PYTHONPATH is built as the concatenation
of profile's search-paths.d.

--=20
Best regards,
Nicolas Graves

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To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Subject: Re: bug#76428: [GCD PATCH]
 003-set-search-paths-without-program-wrappers: Submit.
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Ludovic Court=C3=A8s <ludo@HIDDEN> writes:

> =E5=AE=8B=E6=96=87=E6=AD=A6 <iyzsong@HIDDEN> skribis:
>
>>   ld.so.cache
>>   search-paths.d
>>     GUIX_XDG_DATA_DIRS
>>     GUIX_GIO_EXTRA_MODULES
>>     GUIX_GTK4_PATH
>
> I don=E2=80=99t think the =E2=80=9CGUIX_=E2=80=9D prefix is really justif=
ied in the proposal.

Sure.  There are 2 reasons, one is to avoid broke foreign systems (
GUIX_GIO_EXTRA_MODULES, GUIX_GTK4_PATH), another is about priority
(GUIX_XDG_*) I'll explain later.

>
> There=E2=80=99s a precedent, =E2=80=98GUIX_PYTHONPATH=E2=80=99, but I thi=
nk it does not follow
> that this can be generalized to every search path environment variable.
>
> For example, the XDG_ variables are honored by a lot of software, not
> just GLib- or Qt-based software, and it=E2=80=99s unrealistic to patch th=
em all.
> It=E2=80=99s also undesirable: generally speaking, we want to stay as clo=
se to
> upstream as possible so that documentation, tutorials, and scripts found
> elsewhere also work on Guix.

Yes, we introduced GUIX_PYTHONPATH, GUIX_GTK* to avoid ABI
incompatibility problems between different programs from foreign systems
and Guix systems.  But XDG_DATA_DIRS, as it's designed for shareable
data files, won't have ABI incompatibility problems, and we rely on it
for a foreign desktop launch to find applications (via desktop files),
fonts installed from Guix.

So do we need 'GUIX_XDG_*'?  Well, In 'wrap-program' we can specifiy how
the wrapped environment variables are going to be combined with the
system level variables in 3 positions: prefix, suffix or =3D (exact).  The
priority between wrapped and system level variables influence the
robustness of programs.

For plugins which might have ABI problems, we'll use 'prefix', so a
wrapped program always load the correct ones (eg: qtbase) first, and
hopefully they can ignore the possible incompatible ones (eg: a qt
theme plugin) with reduced functions but still works.

Or for not real search paths which only support a single directory or
file, we'll use '=3D' (eg: SSL_CERT_FILE).

But for XDG_DATA_DIRS and XDG_CONFIG_DIRS, we'll want to use 'suffix',
so that the shared combined data (icons, mime databases) will be used
instead of a seperated incomplete ones.  Also it allow user to customize
them as usually, or 'guix home' or 'guix system' to custom them at
profile level.

In the specified search-paths.d implementation, for simplify reason, the
envs from search-paths.d files are always used in 'prefix' way.  For '=3D'
cases, we could patch it to a real search path (eg:
GUIX_GDK_PIXBUF_MODULE_FILES), or hardcode it (eg:
QTWEBENGINEPROCESS_PATH #75966).  For 'suffix' cases, it uses 2
variables, that's prefer XDG_DATA_DIRS (set by profile or foreign
system) over GUIX_XDG_DATA_DIRS (set by search-paths.d, not leaking).

>
>> ## Find the location of the current executable
>>
>> To find its search path configuration files when an executable is runnin=
g,
>> we can first find the location of the executable.  Conveniently, Linux
>> provides a pseudo-file `/proc/self/exe` for this exact purpose, which wo=
rks
>> well for ELF executables.   But for an interpreter script, `/proc/self/e=
xe`
>> would return the file name of its interpreter instead of the script, so
>> we patch interpreters to set 2 environment variables:
>>
>>   - `GUIX_INTERPRETER_FILE`: absolute file name of the interpreter
>>   - `GUIX_MAIN_SCRIPT_FILE`: absolute file name of the script
>
> We won=E2=80=99t patch every interpreter out there, that=E2=80=99s not re=
asonable.

Yes, python should be the most, also we can avoid patching and still use
'wrap-program' for them.

>
> These two variables could also have unexpected consequences since an
> attacker could override them to cause confusion.

The check (current /prof/self-exe =3D=3D GUIX_INTERPRETER_FILE) done in the
client side should prevent the attack or confusion, if the interpreter
haven't changed then there should be no way to modify
GUIX_MAIN_SCRIPT_FILE set by the interpreter.


> [...]
>
> I=E2=80=99m concerned about the cost of maintaining these patches.  Again=
, the
> ld.so patch (for glibc) sets a precedent, but this part of glibc changes
> relatively rarely, and it=E2=80=99s just one patch; what if we have to ma=
intain
> ten such patches in big and changing libraries like GLib and Qt?

I'm totally fine with reject the implementation due to maintaince
burden.  I could polish the patches later for easier review and decide
they are reasonable or not.

>
> Overall, I think I=E2=80=99d be reassured if we reduced the scope a littl=
e bit:
> don=E2=80=99t insist on the =E2=80=9CGUIX_=E2=80=9D prefix, focus on GTK =
and Qt applications.

Okay, I'll send GUIX_GIO_EXTRA_MODULES as a seperated patch later.  For
'GUIX_XDG_DATA_DIRS' and 'GUIX_XDG_CONFIG_DIRS', do you think the
current implementation plan (GUIX_ ones only used by search-paths.d,
only XDG_DATA_* still set by profile and visible, use 2 variables due to
simplify reason) fine?

Thank you!

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From: =?utf-8?B?5a6L5paH5q2m?= <iyzsong@HIDDEN>
To: Rutherther <rutherther@HIDDEN>
Subject: Re: [GCD deliberation] Set search paths without program wrappers
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Rutherther <rutherther@HIDDEN> writes:

> Hi,
>
> I am missing any mention about the current etc/profile file inside of built
> Guix profiles. Is it planned to also change the function of the search
> paths in profiles?

Hi, this GCD is for program wrappers.  ABI problems caused by environment
variables from profiles may be addressed later, no actual plan yet.

>
> Because for example currently it can happen that GIO_EXTRA_MODULES will
> get set, because dconf is propagated into the profile, and this can
> break, even on Guix system, the expected so files used.

Just like GUIX_GDK_PIXBUF_MODULE_FILES #75523, I'll send a patch for
GUIX_GIO_EXTRA_MODULES later, which will avoid broke foreign systems.
For Guix system, we need more thinking...

>
> 1. After this change, are packages still going to respect the env var as
> well, or will the ones patched and having etc/search-path.d just ignore them
> completely? (replace v prepend)
> And if they won't ignore them, how is this incompatibility
> outlined higher going to be fixed, if anyhow?

They are still going to respect the env vars.  The incompatibility are
reduced due to there won't be environment variables leakage from a
process to its child.  For environment variables from profiles, we may
make them ABI-dependent as suggested by Maxime Devos in
https://issues.guix.gnu.org/63203#5, or improve the upstream to avoid
load ABI incompatible plugins.

>
> 1(b). What if user combines the profiles? For example, I will install
> python and python-numpy to system profile, then python and
> python-matplotlib to user profile. When I start python, which search
> path is actually used? Currently both are as the env var is just merged,

Yes, It's merged by 'guix package --search-paths' in ~/.bash_profile,
user can choose to not merge them by 'source' each profile's
'etc/profile'.

> but it doesn't seem to be possible to me with etc/search-paths.d (at
> least unless the various search-paths.d folders are going to be in an
> env var, but I think that would go against the motivation that env vars
> shouldn't be 'leaking'. Although they wouldn't be leaking to childs
> exactly, they would still be leaking from the profiles sourced.)

Program wrappers (which 'etc/search-paths.d' going to replace) and
profile level search paths are actually for different use cases, for
the former 'leaking' are side effects we don't want, and for
the later set the environment variables is actually we want.

Wrappers are used for necessary dependencies like GSetting schemes,
SVG plugin, etc, without them applications won't start or unuseable.
Profile level search paths (ideally) are for optional things like theme,
nice to have extra features.

> 2. Is something going to happen to the search-paths / native-search-paths
> functionality of the package records in regards to guix profiles? (in
> other words will the generation of etc/profile file in guix profiles be
> afected) And if so, how exactly? I can't seem to comprehend
> it being removed completely as some build systems just won't have the
> patches, at least yet, on the other hand how would it be distinguished
> which ones should end up in the profile exports and which ones should
> just end up in the search-paths.d files?

Not yet anything for search-paths functionality to guix profiles.  As I
wrote earlier, search-paths.d are to replace program wrappers.  The
general rule for program wrappers applied, I think that's if it's a
necessary or nice to have dependeny (gsettings schema, TLS for browsers,
SVG for image viewers), and it can be handled by program wrappers
without introduce dependencies cycle, then we'll use program wrappers or
search-paths.d, otherwise we have to use search-paths from profiles.


Hope it's more clear now, thank you!

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From: Rutherther <rutherther@HIDDEN>
To: =?utf-8?B?5a6L5paH5q2m?= <iyzsong@HIDDEN>
Subject: Re: [GCD deliberation] Set search paths without program wrappers
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Hi,

I am missing any mention about the current etc/profile file inside of built
Guix profiles. Is it planned to also change the function of the search
paths in profiles?

Because for example currently it can happen that GIO_EXTRA_MODULES will
get set, because dconf is propagated into the profile, and this can
break, even on Guix system, the expected so files used. The home profile
packages can pick up the system so files and when the home profile
hasn't been rebuilt yet, you get crashing programs.
I think this means the env var needs to get effectively replaced
instead, or not set at all by the profile's etc/profile file.
This seems to be quite 'common' (after there start to be ABI
incompatibilities, it's common for users to go asking in the irc channel
about this) when libdconfsettings.so ends up in one of the search path folders.

1. After this change, are packages still going to respect the env var as
well, or will the ones patched and having etc/search-path.d just ignore them
completely? (replace v prepend)
And if they won't ignore them, how is this incompatibility
outlined higher going to be fixed, if anyhow?

1(b). What if user combines the profiles? For example, I will install
python and python-numpy to system profile, then python and
python-matplotlib to user profile. When I start python, which search
path is actually used? Currently both are as the env var is just merged,
but it doesn't seem to be possible to me with etc/search-paths.d (at
least unless the various search-paths.d folders are going to be in an
env var, but I think that would go against the motivation that env vars
shouldn't be 'leaking'. Although they wouldn't be leaking to childs
exactly, they would still be leaking from the profiles sourced.)

2. Is something going to happen to the search-paths / native-search-paths
functionality of the package records in regards to guix profiles? (in
other words will the generation of etc/profile file in guix profiles be
afected) And if so, how exactly? I can't seem to comprehend
it being removed completely as some build systems just won't have the
patches, at least yet, on the other hand how would it be distinguished
which ones should end up in the profile exports and which ones should
just end up in the search-paths.d files?

Apologies if I've just missed answers to these questions in the GCD
text or discussion.

Regards,
Rutherther

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: =?utf-8?B?5a6L5paH5q2m?= <iyzsong@HIDDEN>
Subject: Re: bug#76428: [GCD PATCH]
 003-set-search-paths-without-program-wrappers: Submit.
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Hi =E5=AE=8B=E6=96=87=E6=AD=A6,

First of all, apologies for not really contributing to the discussion
before.

My sentiment could be summarized as: I agree with the rationale, I like
the idea of storing search path metadata in package outputs, but I=E2=80=99m
concerned about the maintainability and viability of some aspects of the
proposal (see below).  I=E2=80=99ll send my deliberation in a separate mess=
age.

=E5=AE=8B=E6=96=87=E6=AD=A6 <iyzsong@HIDDEN> skribis:

>   ld.so.cache
>   search-paths.d
>     GUIX_XDG_DATA_DIRS
>     GUIX_GIO_EXTRA_MODULES
>     GUIX_GTK4_PATH

I don=E2=80=99t think the =E2=80=9CGUIX_=E2=80=9D prefix is really justifie=
d in the proposal.

There=E2=80=99s a precedent, =E2=80=98GUIX_PYTHONPATH=E2=80=99, but I think=
 it does not follow
that this can be generalized to every search path environment variable.

For example, the XDG_ variables are honored by a lot of software, not
just GLib- or Qt-based software, and it=E2=80=99s unrealistic to patch them=
 all.
It=E2=80=99s also undesirable: generally speaking, we want to stay as close=
 to
upstream as possible so that documentation, tutorials, and scripts found
elsewhere also work on Guix.

> ## Find the location of the current executable
>
> To find its search path configuration files when an executable is running,
> we can first find the location of the executable.  Conveniently, Linux
> provides a pseudo-file `/proc/self/exe` for this exact purpose, which wor=
ks
> well for ELF executables.   But for an interpreter script, `/proc/self/ex=
e`
> would return the file name of its interpreter instead of the script, so
> we patch interpreters to set 2 environment variables:
>
>   - `GUIX_INTERPRETER_FILE`: absolute file name of the interpreter
>   - `GUIX_MAIN_SCRIPT_FILE`: absolute file name of the script

We won=E2=80=99t patch every interpreter out there, that=E2=80=99s not reas=
onable.

These two variables could also have unexpected consequences since an
attacker could override them to cause confusion.

> ## Implementation plan
>
> A WIP implementation can be found in <https://issues.guix.gnu.org/75688>.
>
> - Add a new function `g_guix_build_search_path_dirs` to GLib, which retur=
ns a
>   search path as a list of file or directory names from a search path
>   configuration file and an environment variable.
> - Patch GLib to use `g_guix_build_search_path_dirs` for `GUIX_XDG_DATA_DI=
RS`,
>   `GUIX_XDG_CONFIG_DIRS`, `GUIX_GIO_EXTRA_MODULES` and
>   `GUIX_GSETTINGS_SCHEMA_DIR`.
> - Patch Python to set `GUIX_INTERPRETER_FILE` and `GUIX_MAIN_SCRIPT_FILE`.
> - Patch Qt to use `g_guix_build_search_path_dirs` for `GUIX_XDG_DATA_DIRS=
`,
>   `GUIX_XDG_CONFIG_DIRS`, `GUIX_QT_PLUGIN_PATH`, `GUIX_QML_IMPORT_PATH`,
>   `GUIX_QML2_IMPORT_PATH`.
> - Modify `glib-or-gtk-build-system` to get rid of `wrap-program`.
> - Modify `qt-build-system` to get rid of `wrap-program`.

I=E2=80=99m concerned about the cost of maintaining these patches.  Again, =
the
ld.so patch (for glibc) sets a precedent, but this part of glibc changes
relatively rarely, and it=E2=80=99s just one patch; what if we have to main=
tain
ten such patches in big and changing libraries like GLib and Qt?

Overall, I think I=E2=80=99d be reassured if we reduced the scope a little =
bit:
don=E2=80=99t insist on the =E2=80=9CGUIX_=E2=80=9D prefix, focus on GTK an=
d Qt applications.

Thanks,
Ludo=E2=80=99.

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To: Janneke Nieuwenhuizen <janneke@HIDDEN>
Subject: Re: [GCD deliberation] Set search paths without program wrappers
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Janneke Nieuwenhuizen <janneke@HIDDEN> writes:

> [...]
>> And when the executable's `/proc/self/exe` matches `GUIX_INTERPRETER_FILE`,
>> we can get the script file name from `GUIX_MAIN_SCRIPT_FILE`.  Alternatively,
>> we can try to construct the script file name from command line arguments, but
>> that won't work when you run a script using a relative file name and its
>> current working directory changed before we figure out the script file name.
>
> Would this work with `guix pack' tarball archives, esp. think
> cross-built `guix pack' archives for MinGW?

I think this should work for `guix pack' when the target is a linux
system, MingGW won't work with '/proc/self/exe', but maybe we can find
something similiar.

I'll keep this in mind and do some tests later, thanks!

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Subject: Re: [GCD deliberation] Set search paths without program wrappers
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Hello,

> # Detailed Design

[..]

> ## Find the location of the current executable
>
> To find its search path configuration files when an executable is running,
> we can first find the location of the executable.  Conveniently, Linux
> provides a pseudo-file `/proc/self/exe` for this exact purpose, which wor=
ks
> well for ELF executables.   But for an interpreter script, `/proc/self/ex=
e`
> would return the file name of its interpreter instead of the script, so
> we patch interpreters to set 2 environment variables:
>
>   - `GUIX_INTERPRETER_FILE`: absolute file name of the interpreter
>   - `GUIX_MAIN_SCRIPT_FILE`: absolute file name of the script
>
> And when the executable's `/proc/self/exe` matches `GUIX_INTERPRETER_FILE=
`,
> we can get the script file name from `GUIX_MAIN_SCRIPT_FILE`.  Alternativ=
ely,
> we can try to construct the script file name from command line arguments,=
 but
> that won't work when you run a script using a relative file name and its
> current working directory changed before we figure out the script file na=
me.

Would this work with `guix pack' tarball archives, esp. think
cross-built `guix pack' archives for MinGW?

Greetings,
Janneke

--=20
Janneke Nieuwenhuizen <janneke@HIDDEN>  | GNU LilyPond https://LilyPond.org
Freelance IT https://www.JoyOfSource.com | Avatar=C2=AE https://AvatarAcade=
my.com

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From: =?utf-8?B?5a6L5paH5q2m?= <iyzsong@HIDDEN>
To: info-guix@HIDDEN
Subject: [GCD deliberation] Set search paths without program wrappers
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Hello, Below is the final version of GCD for "Set search paths without
program wrappers", which means now this GCD start its deliberation
period (14 days), so team members please reply to
<76428 <at> debbugs.gnu.org> with opinions.  Thanks!


link: https://git.savannah.gnu.org/cgit/guix/guix-consensus-documents.git/p=
lain/004-set-search-paths-without-program-wrappers.md
title: Set search paths without program wrappers
id: 004
status: submitted
discussion: https://issues.guix.gnu.org/76428
authors: =E5=AE=8B=E6=96=87=E6=AD=A6 <iyzsong@HIDDEN>
sponsors: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
date-submitted: 2025-02-21
date: 2025-02-21
SPDX-License-Identifier: CC-BY-SA-4.0 OR GFDL-1.3-no-invariants-or-later
---

# Summary

Currently program wrappers are widely used to set search paths via
environment variables.  Those wrappers have some problems:

  - environment variables leakage from a process to its child
    processes;
  - duplicate entries in environment variables;
  - obscured process names.

To address those problems, we propose a way to set search paths with
some per-output configuration files, reduce the need of creating
program wrappers.


# Motivation

To make sure programs work out-of-the-box rather then depend on some
external settings, Guix encourages the use of [program wrappers](https://gu=
ix.gnu.org/manual/en/html_node/Build-Utilities.html#Wrappers)
when define packages.  In particular,  both `glib-or-gtk-build-system`
and `qt-build-system` includes a wrap phase to make program wrappers for ev=
ery
GNOME and KDE program.

Those wrappers have some unsolved issues:

- [Program crash due to leaked environment variables](https://issues.guix.g=
nu.org/63203)
- [Duplicate entries in various environment variables](https://issues.guix.=
gnu.org/23118)
- [Ansible & others' problems with wrapped '.ansible-real' scripts](https:/=
/issues.guix.gnu.org/26752)

If we managed to find a way to set search paths without using program
wappers, then programs will be more robust.


# Detailed Design

In addition to environment variables, some programs also allow to set search
paths via configuration files, for example you can use
[path configuration files](https://docs.python.org/3/library/site.html)
to set `sys.path` for Python, and we have a per-output [`ld.so.cache`](http=
s://guix.gnu.org/en/blog/2021/taming-the-stat-storm-with-a-loader-cache/)
to load shared libraries efficiently.  Inspired by them, we are going to pa=
tch
some programs and libraries, so that when they build a search path from an
environment variable, would also honor a per-output search path configurati=
on
file.  The details are how to make those search path configuration files and
how to find them when an executable is running.

## Search path configuration files

We'll create search path configuration files under the `etc/search-path.d`
directory of each package output, with each file specify a search path.
The file name and its content are same to the corresponding environment
variable.  For example the output of the `gnome-console` package would have:

```
bin
  kgx
etc
  ld.so.cache
  search-paths.d
    GUIX_XDG_DATA_DIRS
    GUIX_GIO_EXTRA_MODULES
    GUIX_GTK4_PATH
lib
share
```

The content of its `GUIX_XDG_DATA_DIRS` file would be:
```
/gnu/store/...-shared-mime-info-2.3/share:/gnu/store/...-glib-2.78.0/share:=
/gnu/store/...-gsettings-desktop-schemas-44.0/share:/gnu/store/...-libadwai=
ta-1.5.2/share:/gnu/store/...-gtk-4.14.5/share:/gnu/store/...-gnome-console=
-44.4/share
```

Those search path configuration files would be created by the package build=
er,
after the `install` phase, replace usages of `wrap-program` when possible.


## Find the location of the current executable

To find its search path configuration files when an executable is running,
we can first find the location of the executable.  Conveniently, Linux
provides a pseudo-file `/proc/self/exe` for this exact purpose, which works
well for ELF executables.   But for an interpreter script, `/proc/self/exe`
would return the file name of its interpreter instead of the script, so
we patch interpreters to set 2 environment variables:

  - `GUIX_INTERPRETER_FILE`: absolute file name of the interpreter
  - `GUIX_MAIN_SCRIPT_FILE`: absolute file name of the script

And when the executable's `/proc/self/exe` matches `GUIX_INTERPRETER_FILE`,
we can get the script file name from `GUIX_MAIN_SCRIPT_FILE`.  Alternativel=
y,
we can try to construct the script file name from command line arguments, b=
ut
that won't work when you run a script using a relative file name and its
current working directory changed before we figure out the script file name.


## Set search paths with configuration files from search-paths.d

Finally, when the program want to build a search path from an
environment variable, we patch the code to search its `search-paths.d`
first, the result search path value will include both the content of
the search path configuration file and the environment variable.  This
usually happens in C/C++ libraries like GLib, GTK and Qt with a
`getenv` call, we need patch these `getenv` calls for each search path
we care.


## Implementation plan

A WIP implementation can be found in <https://issues.guix.gnu.org/75688>.

- Add a new function `g_guix_build_search_path_dirs` to GLib, which returns=
 a
  search path as a list of file or directory names from a search path
  configuration file and an environment variable.
- Patch GLib to use `g_guix_build_search_path_dirs` for `GUIX_XDG_DATA_DIRS=
`,
  `GUIX_XDG_CONFIG_DIRS`, `GUIX_GIO_EXTRA_MODULES` and
  `GUIX_GSETTINGS_SCHEMA_DIR`.
- Patch Python to set `GUIX_INTERPRETER_FILE` and `GUIX_MAIN_SCRIPT_FILE`.
- Patch Qt to use `g_guix_build_search_path_dirs` for `GUIX_XDG_DATA_DIRS`,
  `GUIX_XDG_CONFIG_DIRS`, `GUIX_QT_PLUGIN_PATH`, `GUIX_QML_IMPORT_PATH`,
  `GUIX_QML2_IMPORT_PATH`.
- Modify `glib-or-gtk-build-system` to get rid of `wrap-program`.
- Modify `qt-build-system` to get rid of `wrap-program`.


# The Cost Of Reverting

We can revert to program wrappers by manually adding wrap phases on a case =
by
case basic, if needed.


# Drawbacks or Open Questions

If implemented, we would likely carry several custom patches for GLib,
GTK, Qt, Python, etc. forever.


This proposal focuses solving problems caused by program wrappers in desktop
environments, namely GNOME and KDE.  Individual `wrap-progam` usages are not
addressed.  We plan to handle that in build systems later, for example:

  - Handle `GUIX_GI_TYPELIB_PATH` and `GUIX_GDK_PIXBUF_MODULE_FILES` in
    `glib-or-gtk-build-system` without wrappers.
  - Handle `GUIX_PYTHONPATH` in `python-build-system` without wrappers.


There are still ABI problems caused by environment variables from
profiles, which may be addressed later as suggested by Maxime Devos in
<https://issues.guix.gnu.org/63203#5>.

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From: "pelzflorian (Florian Pelz)" <pelzflorian@HIDDEN>
To: 76428 <at> debbugs.gnu.org
Subject: Re: [bug#76428] [GCD deliberation] Set search paths without program
 wrappers
In-Reply-To: <87a59hdskx.fsf@HIDDEN> (=?utf-8?B?IuWui+aWh+atpg==?= via
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I support; it is needed and backwards-compatible as said on
<https://lists.gnu.org/archive/html/guix-devel/2025-02/msg00450.html>.

Regards,
Florian

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Hello, Below is the final version of GCD for "Set search paths without
program wrappers", which means now this GCD start its deliberation
period (14 days), so team members please reply to
<76428 <at> debbugs.gnu.org> with opinions.  Thanks!


link: https://git.savannah.gnu.org/cgit/guix/guix-consensus-documents.git/p=
lain/004-set-search-paths-without-program-wrappers.md
title: Set search paths without program wrappers
id: 004
status: submitted
discussion: https://issues.guix.gnu.org/76428
authors: =E5=AE=8B=E6=96=87=E6=AD=A6 <iyzsong@HIDDEN>
sponsors: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
date-submitted: 2025-02-21
date: 2025-02-21
SPDX-License-Identifier: CC-BY-SA-4.0 OR GFDL-1.3-no-invariants-or-later
---

# Summary

Currently program wrappers are widely used to set search paths via
environment variables.  Those wrappers have some problems:

  - environment variables leakage from a process to its child
    processes;
  - duplicate entries in environment variables;
  - obscured process names.

To address those problems, we propose a way to set search paths with
some per-output configuration files, reduce the need of creating
program wrappers.


# Motivation

To make sure programs work out-of-the-box rather then depend on some
external settings, Guix encourages the use of [program wrappers](https://gu=
ix.gnu.org/manual/en/html_node/Build-Utilities.html#Wrappers)
when define packages.  In particular,  both `glib-or-gtk-build-system`
and `qt-build-system` includes a wrap phase to make program wrappers for ev=
ery
GNOME and KDE program.

Those wrappers have some unsolved issues:

- [Program crash due to leaked environment variables](https://issues.guix.g=
nu.org/63203)
- [Duplicate entries in various environment variables](https://issues.guix.=
gnu.org/23118)
- [Ansible & others' problems with wrapped '.ansible-real' scripts](https:/=
/issues.guix.gnu.org/26752)

If we managed to find a way to set search paths without using program
wappers, then programs will be more robust.


# Detailed Design

In addition to environment variables, some programs also allow to set search
paths via configuration files, for example you can use
[path configuration files](https://docs.python.org/3/library/site.html)
to set `sys.path` for Python, and we have a per-output [`ld.so.cache`](http=
s://guix.gnu.org/en/blog/2021/taming-the-stat-storm-with-a-loader-cache/)
to load shared libraries efficiently.  Inspired by them, we are going to pa=
tch
some programs and libraries, so that when they build a search path from an
environment variable, would also honor a per-output search path configurati=
on
file.  The details are how to make those search path configuration files and
how to find them when an executable is running.

## Search path configuration files

We'll create search path configuration files under the `etc/search-path.d`
directory of each package output, with each file specify a search path.
The file name and its content are same to the corresponding environment
variable.  For example the output of the `gnome-console` package would have:

```
bin
  kgx
etc
  ld.so.cache
  search-paths.d
    GUIX_XDG_DATA_DIRS
    GUIX_GIO_EXTRA_MODULES
    GUIX_GTK4_PATH
lib
share
```

The content of its `GUIX_XDG_DATA_DIRS` file would be:
```
/gnu/store/...-shared-mime-info-2.3/share:/gnu/store/...-glib-2.78.0/share:=
/gnu/store/...-gsettings-desktop-schemas-44.0/share:/gnu/store/...-libadwai=
ta-1.5.2/share:/gnu/store/...-gtk-4.14.5/share:/gnu/store/...-gnome-console=
-44.4/share
```

Those search path configuration files would be created by the package build=
er,
after the `install` phase, replace usages of `wrap-program` when possible.


## Find the location of the current executable

To find its search path configuration files when an executable is running,
we can first find the location of the executable.  Conveniently, Linux
provides a pseudo-file `/proc/self/exe` for this exact purpose, which works
well for ELF executables.   But for an interpreter script, `/proc/self/exe`
would return the file name of its interpreter instead of the script, so
we patch interpreters to set 2 environment variables:

  - `GUIX_INTERPRETER_FILE`: absolute file name of the interpreter
  - `GUIX_MAIN_SCRIPT_FILE`: absolute file name of the script

And when the executable's `/proc/self/exe` matches `GUIX_INTERPRETER_FILE`,
we can get the script file name from `GUIX_MAIN_SCRIPT_FILE`.  Alternativel=
y,
we can try to construct the script file name from command line arguments, b=
ut
that won't work when you run a script using a relative file name and its
current working directory changed before we figure out the script file name.


## Set search paths with configuration files from search-paths.d

Finally, when the program want to build a search path from an
environment variable, we patch the code to search its `search-paths.d`
first, the result search path value will include both the content of
the search path configuration file and the environment variable.  This
usually happens in C/C++ libraries like GLib, GTK and Qt with a
`getenv` call, we need patch these `getenv` calls for each search path
we care.


## Implementation plan

A WIP implementation can be found in <https://issues.guix.gnu.org/75688>.

- Add a new function `g_guix_build_search_path_dirs` to GLib, which returns=
 a
  search path as a list of file or directory names from a search path
  configuration file and an environment variable.
- Patch GLib to use `g_guix_build_search_path_dirs` for `GUIX_XDG_DATA_DIRS=
`,
  `GUIX_XDG_CONFIG_DIRS`, `GUIX_GIO_EXTRA_MODULES` and
  `GUIX_GSETTINGS_SCHEMA_DIR`.
- Patch Python to set `GUIX_INTERPRETER_FILE` and `GUIX_MAIN_SCRIPT_FILE`.
- Patch Qt to use `g_guix_build_search_path_dirs` for `GUIX_XDG_DATA_DIRS`,
  `GUIX_XDG_CONFIG_DIRS`, `GUIX_QT_PLUGIN_PATH`, `GUIX_QML_IMPORT_PATH`,
  `GUIX_QML2_IMPORT_PATH`.
- Modify `glib-or-gtk-build-system` to get rid of `wrap-program`.
- Modify `qt-build-system` to get rid of `wrap-program`.


# The Cost Of Reverting

We can revert to program wrappers by manually adding wrap phases on a case =
by
case basic, if needed.


# Drawbacks or Open Questions

If implemented, we would likely carry several custom patches for GLib,
GTK, Qt, Python, etc. forever.


This proposal focuses solving problems caused by program wrappers in desktop
environments, namely GNOME and KDE.  Individual `wrap-progam` usages are not
addressed.  We plan to handle that in build systems later, for example:

  - Handle `GUIX_GI_TYPELIB_PATH` and `GUIX_GDK_PIXBUF_MODULE_FILES` in
    `glib-or-gtk-build-system` without wrappers.
  - Handle `GUIX_PYTHONPATH` in `python-build-system` without wrappers.


There are still ABI problems caused by environment variables from
profiles, which may be addressed later as suggested by Maxime Devos in
<https://issues.guix.gnu.org/63203#5>.

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From: =?utf-8?B?5a6L5paH5q2m?= <iyzsong@HIDDEN>
To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Subject: Re: bug#76428: [GCD PATCH]
 003-set-search-paths-without-program-wrappers: Submit.
In-Reply-To: <871pvmnez7.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
 =?utf-8?Q?s?= message of "Tue, 25 Feb 2025 17:53:00 +0100")
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Ludovic Court=C3=A8s <ludo@HIDDEN> writes:

>> [...]
>> +Those search path configuration files would be created by the package b=
uilder,
>> +after the `install` phase, replace usages of `wrap-program` when possib=
le.
>
> One thought came to mind.
>
> If we are going to provide that sort of metadata along side package
> build results, what about providing a =E2=80=98package=E2=80=99 sexp simi=
lar to those
> found in the =E2=80=98manifest=E2=80=99 file of profiles (see =E2=80=98ma=
nifest->gexp=E2=80=99), for
> example in =E2=80=98etc/guix/package=E2=80=99?

Okay, I guess that can be done in gnu-build-system.

>
> The sexp could provide info such as: the package name and version, its
> search paths, maybe its propagated inputs.
>
> This could have applications for things like =E2=80=98guix health=E2=80=
=99=C2=B9 and maybe
> even fixing <https://issues.guix.gnu.org/20255>.

That #20255 is already fixed, by 'guix package --search-paths' with
multiple profiles.

I think you mean <https://issues.guix.gnu.org/22138>:
  "Search paths of dependencies are not honored"

> But now I realize that the main drawback of this approach is that it
> would be too hard to parse that in GLib etc.

The sexp file and search-paths.d files could coexist, we can build the
latter from the former.


> So this is probably not a useful comment, but now we have it on record.

I see that a package level sexp metadata file would be useful, we could
do it indepent of this GCD.

Thanks.

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: iyzsong@HIDDEN
Subject: Re: bug#76428: [GCD PATCH]
 003-set-search-paths-without-program-wrappers: Submit.
In-Reply-To: <20250220040827.4127-1-iyzsong@HIDDEN> (iyzsong@HIDDEN's
 message of "Thu, 20 Feb 2025 12:08:23 +0800")
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Hi =E5=AE=8B=E6=96=87=E6=AD=A6,

iyzsong@HIDDEN skribis:

> +etc
> +  ld.so.cache
> +  search-paths.d
> +    GUIX_XDG_DATA_DIRS
> +    GUIX_GIO_EXTRA_MODULES
> +    GUIX_GTK4_PATH
> +lib
> +share
> +```
> +
> +The content of its `GUIX_XDG_DATA_DIRS` file would be:
> +```
> +/gnu/store/...-shared-mime-info-2.3/share:/gnu/store/...-glib-2.78.0/sha=
re:/gnu/store/...-gsettings-desktop-schemas-44.0/share:/gnu/store/...-libad=
waita-1.5.2/share:/gnu/store/...-gtk-4.14.5/share:/gnu/store/...-gnome-cons=
ole-44.4/share
> +```
> +
> +Those search path configuration files would be created by the package bu=
ilder,
> +after the `install` phase, replace usages of `wrap-program` when possibl=
e.

One thought came to mind.

If we are going to provide that sort of metadata along side package
build results, what about providing a =E2=80=98package=E2=80=99 sexp simila=
r to those
found in the =E2=80=98manifest=E2=80=99 file of profiles (see =E2=80=98mani=
fest->gexp=E2=80=99), for
example in =E2=80=98etc/guix/package=E2=80=99?

The sexp could provide info such as: the package name and version, its
search paths, maybe its propagated inputs.

This could have applications for things like =E2=80=98guix health=E2=80=99=
=C2=B9 and maybe
even fixing <https://issues.guix.gnu.org/20255>.

But now I realize that the main drawback of this approach is that it
would be too hard to parse that in GLib etc.

So this is probably not a useful comment, but now we have it on record.
:-)

Thanks,
Ludo=E2=80=99.

=C2=B9 https://issues.guix.gnu.org/31444

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From: =?utf-8?B?5a6L5paH5q2m?= <iyzsong@HIDDEN>
To: Simon Tournier <zimon.toutoune@HIDDEN>
Subject: Re: [bug#76428] [PATCH v2]
 004-set-search-paths-without-program-wrappers: Submit.
In-Reply-To: <87bjuvry05.fsf@HIDDEN> (Simon Tournier's message of "Fri, 21
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Simon Tournier <zimon.toutoune@HIDDEN> writes:

> =E5=97=A8 =E5=AE=8B=E6=96=87=E6=AD=A6!
>
> More or less copy/pasting [1] what I wrote to Liliana about GCD 003.
>
> Now, the GCD=E2=80=99s submitted \o/, I recommend to push the two first
> revisions and then each new revision to a dedicated branch, say
> =E2=80=99wip-set-search-paths-without-program-wrapper=E2=80=99 directly t=
o the GCDs
> repository.

Done, thanks.


It now can be view from:

https://git.savannah.gnu.org/cgit/guix/guix-consensus-documents.git/tree/00=
4-set-search-paths-without-program-wrappers.md?h=3Dwip-set-search-paths-wit=
hout-program-wrappers

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Subject: Re: [GCD] Set search paths without program wrappers
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=E5=AE=8B=E6=96=87=E6=AD=A6 via "Development of GNU Guix and the GNU System=
 distribution."
<guix-devel@HIDDEN> writes:

> Hartmut Goebel <h.goebel@HIDDEN> writes:
>
>> Hi,
>>
>> I don't understand what solution you propose.
>>
>> The GCD talks about setting some Env variable, like
>> `GUIX_INTERPRETER_FILE` and `GUIX_MAIN_SCRIPT_FILE` (for Python).
>> What is happening then? Isn't there some code required for reading
>> the files in search-paths.d and set the variables
>> accordingly?
Add a small section to clarify where search-paths.d is used:

https://git.savannah.gnu.org/cgit/guix/guix-consensus-documents.git/commit/=
004-set-search-paths-without-program-wrappers.md?h=3Dwip-set-search-paths-w=
ithout-program-wrappers&id=3D990d1a273018a2782666089de2c9878f02cfe6e6


The lastest version of this GCD can be viewed from:

https://git.savannah.gnu.org/cgit/guix/guix-consensus-documents.git/plain/0=
04-set-search-paths-without-program-wrappers.md?h=3Dwip-set-search-paths-wi=
thout-program-wrappers


Hope it helps, thanks.

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From: Simon Tournier <zimon.toutoune@HIDDEN>
To: iyzsong@HIDDEN, 76428 <at> debbugs.gnu.org
Subject: Re: [bug#76428] [PATCH v2]
 004-set-search-paths-without-program-wrappers: Submit.
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=E5=97=A8 =E5=AE=8B=E6=96=87=E6=AD=A6!

More or less copy/pasting [1] what I wrote to Liliana about GCD 003.

Now, the GCD=E2=80=99s submitted \o/, I recommend to push the two first
revisions and then each new revision to a dedicated branch, say
=E2=80=99wip-set-search-paths-without-program-wrapper=E2=80=99 directly to =
the GCDs
repository.

    https://git.savannah.gnu.org/cgit/guix/guix-consensus-documents.git

You can take example from wip-default-branch-name. :-) At the end of the
process, this branch will be merged to =E2=80=99main=E2=80=99.

Why?  Based on the experience of 001, it can quickly become a mess. :-)

There is several revisions in different emails and all becomes harder
and harder to follow.  Do I read the last revision?  This one?  Ah no
there is this yet another email?  And that MUA screwed up the subject=E2=80=
=A6
Is it really the last revision?  etc.  Hard to follow; especially for
the ones who just want to read the last current revision.

Moreover, it=E2=80=99s more comfortable to read a plain file than a diff or=
 a
patch, IMHO.  For example, one specific revision of 001:

    https://git.savannah.gnu.org/cgit/guix/guix-consensus-documents.git/tre=
e/0001-rfc-process.md?id=3D7da54b980efcd23ce662040b00712bd7fa76982e

(It perfectly works with Emacs browser EWW so it works for any
browser. ;-))

Last, having all the revisions in a dedicated branch allows to easily
diff between each revision.

So for the next revision, you could announce a link for the new revision
(for example of a link, the one above) in addition to the patch or plain
file.

My 2 cents. :-)

Cheers,
simon



1: [bug#76407] [GCD] A better name for the default branch
Simon Tournier <zimon.toutoune@HIDDEN>
Thu, 20 Feb 2025 18:25:02 +0100
id:87frk8lea9.fsf@HIDDEN
https://issues.guix.gnu.org/76407
https://issues.guix.gnu.org/msgid/87frk8lea9.fsf@HIDDEN
https://yhetil.org/guix/87frk8lea9.fsf@HIDDEN

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--=-=-=
Content-Type: text/plain

Hi Guix, "GCD 004: Set search paths without program wrappers" was
submitted to address the issues of program wrappers.

Discuss via email in <76428 <at> debbugs.gnu.org>, thanks.


--=-=-=
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline;
 filename=004-set-search-paths-without-program-wrappers.md
Content-Transfer-Encoding: quoted-printable

title: Set search paths without program wrappers
id: 004
status: submitted
discussion: https://issues.guix.gnu.org/76428
authors: =E5=AE=8B=E6=96=87=E6=AD=A6 <iyzsong@HIDDEN>
sponsors: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
date-submitted: 2025-02-21
date: 2025-02-21
SPDX-License-Identifier: CC-BY-SA-4.0 OR GFDL-1.3-no-invariants-or-later
---

# Summary

Currently program wrappers are widely used to set search paths via
environment variables.  Those wrappers have some problems:

  - environment variables leakage from a process to its child
    processes;
  - duplicate entries in environment variables;
  - obscured process names.

To address those problems, we propose a way to set search paths with
some per-output configuration files, reduce the need of creating
program wrappers.


# Motivation

To make sure programs work out-of-the-box rather then depend on some
external settings, Guix encourages the use of [program wrappers](https://gu=
ix.gnu.org/manual/en/html_node/Build-Utilities.html#Wrappers)
when define packages.  In particular,  both `glib-or-gtk-build-system`
and `qt-build-system` includes a wrap phase to make program wrappers for ev=
ery
GNOME and KDE program.

Those wrappers have some unsolved issues:

- [Program crash due to leaked environment variables](https://issues.guix.g=
nu.org/63203)
- [Duplicate entries in various environment variables](https://issues.guix.=
gnu.org/23118)
- [Ansible & others' problems with wrapped '.ansible-real' scripts](https:/=
/issues.guix.gnu.org/26752)

If we managed to find a way to set search paths without using program
wappers, then programs will be more robust.


# Detailed Design

In addition to environment variables, some programs also allow to set search
paths via configuration files, for example you can use
[path configuration files](https://docs.python.org/3/library/site.html)
to set `sys.path` for Python, and we have a per-output [`ld.so.cache`](http=
s://guix.gnu.org/en/blog/2021/taming-the-stat-storm-with-a-loader-cache/)
to load shared libraries efficiently.  Inspired by them, we are going to pa=
tch
some programs and libraries, so that when they build a search path from an
environment variable, would also honor a per-output search path configurati=
on
file.  The details are how to make those search path configuration files and
how to find them when an executable is running.

## Search path configuration files

We'll create search path configuration files under the `etc/search-path.d`
directory of each package output, with each file specify a search path.
The file name and its content are same to the corresponding environment
variable.  For example the output of the `gnome-console` package would have:

```
bin
  kgx
etc
  ld.so.cache
  search-paths.d
    GUIX_XDG_DATA_DIRS
    GUIX_GIO_EXTRA_MODULES
    GUIX_GTK4_PATH
lib
share
```

The content of its `GUIX_XDG_DATA_DIRS` file would be:
```
/gnu/store/...-shared-mime-info-2.3/share:/gnu/store/...-glib-2.78.0/share:=
/gnu/store/...-gsettings-desktop-schemas-44.0/share:/gnu/store/...-libadwai=
ta-1.5.2/share:/gnu/store/...-gtk-4.14.5/share:/gnu/store/...-gnome-console=
-44.4/share
```

Those search path configuration files would be created by the package build=
er,
after the `install` phase, replace usages of `wrap-program` when possible.


## Find the location of the current executable

To find its search path configuration files when an executable is running,
we can first find the location of the executable.  Conveniently, Linux
provides a pseudo-file `/proc/self/exe` for this exact purpose, which works
well for ELF executables.   But for an interpreter script, `/proc/self/exe`
would return the file name of its interpreter instead of the script, so
we patch interpreters to set 2 environment variables:

  - `GUIX_INTERPRETER_FILE`: absolute file name of the interpreter
  - `GUIX_MAIN_SCRIPT_FILE`: absolute file name of the script

And when the executable's `/proc/self/exe` matches `GUIX_INTERPRETER_FILE`,
we can get the script file name from `GUIX_MAIN_SCRIPT_FILE`.  Alternativel=
y,
we can try to construct the script file name from command line arguments, b=
ut
that won't work when you run a script using a relative file name and its
current working directory changed before we figure out the script file name.


## Implementation plan

A WIP implementation can be found in <https://issues.guix.gnu.org/75688>.

- Add a new function `g_guix_build_search_path_dirs` to GLib, which returns=
 a
  search path as a list of file or directory names from a search path
  configuration file and an environment variable.
- Patch GLib to use `g_guix_build_search_path_dirs` for `GUIX_XDG_DATA_DIRS=
`,
  `GUIX_XDG_CONFIG_DIRS`, `GUIX_GIO_EXTRA_MODULES` and
  `GUIX_GSETTINGS_SCHEMA_DIR`.
- Patch Python to set `GUIX_INTERPRETER_FILE` and `GUIX_MAIN_SCRIPT_FILE`.
- Patch Qt to use `g_guix_build_search_path_dirs` for `GUIX_XDG_DATA_DIRS`,
  `GUIX_XDG_CONFIG_DIRS`, `GUIX_QT_PLUGIN_PATH`, `GUIX_QML_IMPORT_PATH`,
  `GUIX_QML2_IMPORT_PATH`, `GUIX_QTWEBENGINEPROCESS_PATH`.
- Modify `glib-or-gtk-build-system` to get rid of `wrap-program`.
- Modify `qt-build-system` to get rid of `wrap-program`.


# The Cost Of Reverting

We can revert to program wrappers by manually adding wrap phases on a case =
by
case basic, if needed.


# Drawbacks or Open Questions

If implemented, we would likely carry several custom patches for GLib,
GTK, Qt, Python, etc. forever.


This proposal focuses solving problems caused by program wrappers in desktop
environments, namely GNOME and KDE.  Individual `wrap-progam` usages are not
addressed.  We plan to handle that in build systems later, for example:

  - Handle `GUIX_GI_TYPELIB_PATH` and `GUIX_GDK_PIXBUF_MODULE_FILES` in
    `glib-or-gtk-build-system` without wrappers.
  - Handle `GUIX_PYTHONPATH` in `python-build-system` without wrappers.


There are still ABI problems caused by environment variables from
profiles, which may be addressed later as suggested by Maxime Devos in
<https://issues.guix.gnu.org/63203#5>.

--=-=-=--

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To: Simon Tournier <zimon.toutoune@HIDDEN>
Subject: Re: bug#76428: [GCD PATCH]
 003-set-search-paths-without-program-wrappers: Submit.
In-Reply-To: <87eczseolc.fsf@HIDDEN> (Simon Tournier's message of "Thu, 20
 Feb 2025 14:24:15 +0100")
References: <20250220040827.4127-1-iyzsong@HIDDEN> <87eczseolc.fsf@HIDDEN>
Date: Fri, 21 Feb 2025 10:31:44 +0800
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Simon Tournier <zimon.toutoune@HIDDEN> writes:

> Hi,
>
> On Thu, 20 Feb 2025 at 12:08, iyzsong@HIDDEN wrote:
>
>> * 003-set-search-paths-without-program-wrappers.md: New file.
>
> [...]
>
>> +id: 003
>
> Please consider that bug#76407 [1] is already 003.  Well, the numbering
> changes nothing at this point.  The final number of this GCD =E2=80=9CSet=
 search
> paths without program wrappers=E2=80=9D will be 004 though.
>
>
>> +SPDX-License-Identifier: CC-BY-SA-4.0 OR GFDL-1.3-no-invariants-only
>
> I think this should be: GFDL-1.3-no-invariants-or-later as GCD 001 and
> 000-template.md mentions it [2,3].
>
> Except if you specifically want to be =E2=80=9C-only=E2=80=9D instead. :-)
>

Updated in v2, thank you!

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To: 76428 <at> debbugs.gnu.org
Subject: [PATCH v2] 004-set-search-paths-without-program-wrappers: Submit.
Date: Fri, 21 Feb 2025 10:30:58 +0800
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From: 宋文武 <iyzsong@HIDDEN>

* 004-set-search-paths-without-program-wrappers.md: New file.
---
 ...t-search-paths-without-program-wrappers.md | 146 ++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 004-set-search-paths-without-program-wrappers.md

diff --git a/004-set-search-paths-without-program-wrappers.md b/004-set-search-paths-without-program-wrappers.md
new file mode 100644
index 0000000..39fb473
--- /dev/null
+++ b/004-set-search-paths-without-program-wrappers.md
@@ -0,0 +1,146 @@
+title: Set search paths without program wrappers
+id: 004
+status: submitted
+discussion: https://issues.guix.gnu.org/76428
+authors: 宋文武 <iyzsong@HIDDEN>
+sponsors: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
+date-submitted: 2025-02-20
+date: 2025-02-21
+SPDX-License-Identifier: CC-BY-SA-4.0 OR GFDL-1.3-no-invariants-or-later
+---
+
+# Summary
+
+Currently program wrappers are widely used to set search paths via
+environment variables.  Those wrappers have some problems:
+
+  - environment variables leakage from a process to its child
+    processes;
+  - duplicate entries in environment variables;
+  - obscured process names.
+
+To address those problems, we propose a way to set search paths with
+some per-output configuration files, reduce the need of creating
+program wrappers.
+
+
+# Motivation
+
+To make sure programs work out-of-the-box rather then depend on some
+external settings, Guix encourages the use of [program wrappers](https://guix.gnu.org/manual/en/html_node/Build-Utilities.html#Wrappers)
+when define packages.  In particular,  both `glib-or-gtk-build-system`
+and `qt-build-system` includes a wrap phase to make program wrappers for every
+GNOME and KDE program.
+
+Those wrappers have some unsolved issues:
+
+- [Program crash due to leaked environment variables](https://issues.guix.gnu.org/63203)
+- [Duplicate entries in various environment variables](https://issues.guix.gnu.org/23118)
+- [Ansible & others' problems with wrapped '.ansible-real' scripts](https://issues.guix.gnu.org/26752)
+
+If we managed to find a way to set search paths without using program
+wappers, then programs will be more robust.
+
+
+# Detailed Design
+
+In addition to environment variables, some programs also allow to set search
+paths via configuration files, for example you can use
+[path configuration files](https://docs.python.org/3/library/site.html)
+to set `sys.path` for Python, and we have a per-output [`ld.so.cache`](https://guix.gnu.org/en/blog/2021/taming-the-stat-storm-with-a-loader-cache/)
+to load shared libraries efficiently.  Inspired by them, we are going to patch
+some programs and libraries, so that when they build a search path from an
+environment variable, would also honor a per-output search path configuration
+file.  The details are how to make those search path configuration files and
+how to find them when an executable is running.
+
+## Search path configuration files
+
+We'll create search path configuration files under the `etc/search-path.d`
+directory of each package output, with each file specify a search path.
+The file name and its content are same to the corresponding environment
+variable.  For example the output of the `gnome-console` package would have:
+
+```
+bin
+  kgx
+etc
+  ld.so.cache
+  search-paths.d
+    GUIX_XDG_DATA_DIRS
+    GUIX_GIO_EXTRA_MODULES
+    GUIX_GTK4_PATH
+lib
+share
+```
+
+The content of its `GUIX_XDG_DATA_DIRS` file would be:
+```
+/gnu/store/...-shared-mime-info-2.3/share:/gnu/store/...-glib-2.78.0/share:/gnu/store/...-gsettings-desktop-schemas-44.0/share:/gnu/store/...-libadwaita-1.5.2/share:/gnu/store/...-gtk-4.14.5/share:/gnu/store/...-gnome-console-44.4/share
+```
+
+Those search path configuration files would be created by the package builder,
+after the `install` phase, replace usages of `wrap-program` when possible.
+
+
+## Find the location of the current executable
+
+To find its search path configuration files when an executable is running,
+we can first find the location of the executable.  Conveniently, Linux
+provides a pseudo-file `/proc/self/exe` for this exact purpose, which works
+well for ELF executables.   But for an interpreter script, `/proc/self/exe`
+would return the file name of its interpreter instead of the script, so
+we patch interpreters to set 2 environment variables:
+
+  - `GUIX_INTERPRETER_FILE`: absolute file name of the interpreter
+  - `GUIX_MAIN_SCRIPT_FILE`: absolute file name of the script
+
+And when the executable's `/proc/self/exe` matches `GUIX_INTERPRETER_FILE`,
+we can get the script file name from `GUIX_MAIN_SCRIPT_FILE`.  Alternatively,
+we can try to construct the script file name from command line arguments, but
+that won't work when you run a script using a relative file name and its
+current working directory changed before we figure out the script file name.
+
+
+## Implementation plan
+
+A WIP implementation can be found in <https://issues.guix.gnu.org/75688>.
+
+- Add a new function `g_guix_build_search_path_dirs` to GLib, which returns a
+  search path as a list of file or directory names from a search path
+  configuration file and an environment variable.
+- Patch GLib to use `g_guix_build_search_path_dirs` for `GUIX_XDG_DATA_DIRS`,
+  `GUIX_XDG_CONFIG_DIRS`, `GUIX_GIO_EXTRA_MODULES` and
+  `GUIX_GSETTINGS_SCHEMA_DIR`.
+- Patch Python to set `GUIX_INTERPRETER_FILE` and `GUIX_MAIN_SCRIPT_FILE`.
+- Patch Qt to use `g_guix_build_search_path_dirs` for `GUIX_XDG_DATA_DIRS`,
+  `GUIX_XDG_CONFIG_DIRS`, `GUIX_QT_PLUGIN_PATH`, `GUIX_QML_IMPORT_PATH`,
+  `GUIX_QML2_IMPORT_PATH`, `GUIX_QTWEBENGINEPROCESS_PATH`.
+- Modify `glib-or-gtk-build-system` to get rid of `wrap-program`.
+- Modify `qt-build-system` to get rid of `wrap-program`.
+
+
+# The Cost Of Reverting
+
+We can revert to program wrappers by manually adding wrap phases on a case by
+case basic, if needed.
+
+
+# Drawbacks or Open Questions
+
+If implemented, we would likely carry several custom patches for GLib,
+GTK, Qt, Python, etc. forever.
+
+
+This proposal focuses solving problems caused by program wrappers in desktop
+environments, namely GNOME and KDE.  Individual `wrap-progam` usages are not
+addressed.  We plan to handle that in build systems later, for example:
+
+  - Handle `GUIX_GI_TYPELIB_PATH` and `GUIX_GDK_PIXBUF_MODULE_FILES` in
+    `glib-or-gtk-build-system` without wrappers.
+  - Handle `GUIX_PYTHONPATH` in `python-build-system` without wrappers.
+
+
+There are still ABI problems caused by environment variables from
+profiles, which may be addressed later as suggested by Maxime Devos in
+<https://issues.guix.gnu.org/63203#5>.
-- 
2.48.1

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From: Simon Tournier <zimon.toutoune@HIDDEN>
To: iyzsong@HIDDEN
Subject: Re: bug#76428: [GCD PATCH]
 003-set-search-paths-without-program-wrappers: Submit.
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Hi,

On Thu, 20 Feb 2025 at 12:08, iyzsong@HIDDEN wrote:

> * 003-set-search-paths-without-program-wrappers.md: New file.

[...]

> +id: 003

Please consider that bug#76407 [1] is already 003.  Well, the numbering
changes nothing at this point.  The final number of this GCD =E2=80=9CSet s=
earch
paths without program wrappers=E2=80=9D will be 004 though.


> +SPDX-License-Identifier: CC-BY-SA-4.0 OR GFDL-1.3-no-invariants-only

I think this should be: GFDL-1.3-no-invariants-or-later as GCD 001 and
000-template.md mentions it [2,3].

Except if you specifically want to be =E2=80=9C-only=E2=80=9D instead. :-)

Cheers,
simon


1: [bug#76407] [GCD] A better name for the default branch
Liliana Marie Prikler <liliana.prikler@HIDDEN>
Tue, 18 Feb 2025 23:07:07 +0100
id:b900cd17b88123af3ae95f4e7d572e540f86e879.camel@HIDDEN
https://issues.guix.gnu.org/76407
https://issues.guix.gnu.org/msgid/b900cd17b88123af3ae95f4e7d572e540f86e879.=
camel@HIDDEN
https://yhetil.org/guix/b900cd17b88123af3ae95f4e7d572e540f86e879.camel@gmai=
l.com

2: https://git.savannah.gnu.org/cgit/guix/guix-consensus-documents.git/tree=
/001-gcd-process.md?id=3Dc6a594ceb316e23bea975928eb2f40b7df450c94#n8

3: https://git.savannah.gnu.org/cgit/guix/guix-consensus-documents.git/tree=
/000-template.md?id=3Dc6a594ceb316e23bea975928eb2f40b7df450c94#n8

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From: iyzsong@HIDDEN
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Subject: [GCD PATCH] 003-set-search-paths-without-program-wrappers: Submit.
Date: Thu, 20 Feb 2025 12:08:23 +0800
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From: 宋文武 <iyzsong@HIDDEN>

* 003-set-search-paths-without-program-wrappers.md: New file.
---
 ...t-search-paths-without-program-wrappers.md | 146 ++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 003-set-search-paths-without-program-wrappers.md

diff --git a/003-set-search-paths-without-program-wrappers.md b/003-set-search-paths-without-program-wrappers.md
new file mode 100644
index 0000000..1a75bcb
--- /dev/null
+++ b/003-set-search-paths-without-program-wrappers.md
@@ -0,0 +1,146 @@
+title: Set search paths without program wrappers
+id: 003
+status: submitted
+discussion: https://issues.guix.gnu.org/<number assigned by issue tracker>
+authors: 宋文武 <iyzsong@HIDDEN>
+sponsors: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
+date-submitted: 2025-02-20
+date: 2025-02-20
+SPDX-License-Identifier: CC-BY-SA-4.0 OR GFDL-1.3-no-invariants-only
+---
+
+# Summary
+
+Currently program wrappers are widely used to set search paths via
+environment variables.  Those wrappers have some problems:
+
+  - environment variables leakage from a process to its child
+    processes;
+  - duplicate entries in environment variables;
+  - obscured process names.
+
+To address those problems, we propose a way to set search paths with
+some per-output configuration files, reduce the need of creating
+program wrappers.
+
+
+# Motivation
+
+To make sure programs work out-of-the-box rather then depend on some
+external settings, Guix encourages the use of [program wrappers](https://guix.gnu.org/manual/en/html_node/Build-Utilities.html#Wrappers)
+when define packages.  In particular,  both `glib-or-gtk-build-system`
+and `qt-build-system` includes a wrap phase to make program wrappers for every
+GNOME and KDE program.
+
+Those wrappers have some unsolved issues:
+
+- [Program crash due to leaked environment variables](https://issues.guix.gnu.org/63203)
+- [Duplicate entries in various environment variables](https://issues.guix.gnu.org/23118)
+- [Ansible & others' problems with wrapped '.ansible-real' scripts](https://issues.guix.gnu.org/26752)
+
+If we managed to find a way to set search paths without using program
+wappers, then programs will be more robust.
+
+
+# Detailed Design
+
+In addition to environment variables, some programs also allow to set search
+paths via configuration files, for example you can use
+[path configuration files](https://docs.python.org/3/library/site.html)
+to set `sys.path` for Python, and we have a per-output [`ld.so.cache`](https://guix.gnu.org/en/blog/2021/taming-the-stat-storm-with-a-loader-cache/)
+to load shared libraries efficiently.  Inspired by them, we are going to patch
+some programs and libraries, so that when they build a search path from an
+environment variable, would also honor a per-output search path configuration
+file.  The details are how to make those search path configuration files and
+how to find them when an executable is running.
+
+## Search path configuration files
+
+We'll create search path configuration files under the `etc/search-path.d`
+directory of each package output, with each file specify a search path.
+The file name and its content are same to the corresponding environment
+variable.  For example the output of the `gnome-console` package would have:
+
+```
+bin
+  kgx
+etc
+  ld.so.cache
+  search-paths.d
+    GUIX_XDG_DATA_DIRS
+    GUIX_GIO_EXTRA_MODULES
+    GUIX_GTK4_PATH
+lib
+share
+```
+
+The content of its `GUIX_XDG_DATA_DIRS` file would be:
+```
+/gnu/store/...-shared-mime-info-2.3/share:/gnu/store/...-glib-2.78.0/share:/gnu/store/...-gsettings-desktop-schemas-44.0/share:/gnu/store/...-libadwaita-1.5.2/share:/gnu/store/...-gtk-4.14.5/share:/gnu/store/...-gnome-console-44.4/share
+```
+
+Those search path configuration files would be created by the package builder,
+after the `install` phase, replace usages of `wrap-program` when possible.
+
+
+## Find the location of the current executable
+
+To find its search path configuration files when an executable is running,
+we can first find the location of the executable.  Conveniently, Linux
+provides a pseudo-file `/proc/self/exe` for this exact purpose, which works
+well for ELF executables.   But for an interpreter script, `/proc/self/exe`
+would return the file name of its interpreter instead of the script, so
+we patch interpreters to set 2 environment variables:
+
+  - `GUIX_INTERPRETER_FILE`: absolute file name of the interpreter
+  - `GUIX_MAIN_SCRIPT_FILE`: absolute file name of the script
+
+And when the executable's `/proc/self/exe` matches `GUIX_INTERPRETER_FILE`,
+we can get the script file name from `GUIX_MAIN_SCRIPT_FILE`.  Alternatively,
+we can try to construct the script file name from command line arguments, but
+that won't work when you run a script using a relative file name and its
+current working directory changed before we figure out the script file name.
+
+
+## Implementation plan
+
+A WIP implementation can be found in <https://issues.guix.gnu.org/75688>.
+
+- Add a new function `g_guix_build_search_path_dirs` to GLib, which returns a
+  search path as a list of file or directory names from a search path
+  configuration file and an environment variable.
+- Patch GLib to use `g_guix_build_search_path_dirs` for `GUIX_XDG_DATA_DIRS`,
+  `GUIX_XDG_CONFIG_DIRS`, `GUIX_GIO_EXTRA_MODULES` and
+  `GUIX_GSETTINGS_SCHEMA_DIR`.
+- Patch Python to set `GUIX_INTERPRETER_FILE` and `GUIX_MAIN_SCRIPT_FILE`.
+- Patch Qt to use `g_guix_build_search_path_dirs` for `GUIX_XDG_DATA_DIRS`,
+  `GUIX_XDG_CONFIG_DIRS`, `GUIX_QT_PLUGIN_PATH`, `GUIX_QML_IMPORT_PATH`,
+  `GUIX_QML2_IMPORT_PATH`, `GUIX_QTWEBENGINEPROCESS_PATH`.
+- Modify `glib-or-gtk-build-system` to get rid of `wrap-program`.
+- Modify `qt-build-system` to get rid of `wrap-program`.
+
+
+# The Cost Of Reverting
+
+We can revert to program wrappers by manually adding wrap phases on a case by
+case basic, if needed.
+
+
+# Drawbacks or Open Questions
+
+If implemented, we would likely carry several custom patches for GLib,
+GTK, Qt, Python, etc. forever.
+
+
+This proposal focuses solving problems caused by program wrappers in desktop
+environments, namely GNOME and KDE.  Individual `wrap-progam` usages are not
+addressed.  We plan to handle that in build systems later, for example:
+
+  - Handle `GUIX_GI_TYPELIB_PATH` and `GUIX_GDK_PIXBUF_MODULE_FILES` in
+    `glib-or-gtk-build-system` without wrappers.
+  - Handle `GUIX_PYTHONPATH` in `python-build-system` without wrappers.
+
+
+There are still ABI problems caused by environment variables from
+profiles, which may be addressed later as suggested by Maxime Devos in
+<https://issues.guix.gnu.org/63203#5>.
-- 
2.48.1