GNU bug report logs - #74434
[PATCH] py-compile: Allow user to disable python

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Package: automake-patches; Reported by: Frédéric Bérat <fberat@HIDDEN>; Keywords: patch; dated Tue, 19 Nov 2024 09:55:02 UTC; Maintainer for automake-patches is automake-patches@HIDDEN.

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From: Frederic Berat <fberat@HIDDEN>
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Subject: Re: [bug#74434] [PATCH] py-compile: Allow user to disable python
To: Karl Berry <karl@HIDDEN>
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On Sun, Nov 24, 2024 at 3:05=E2=80=AFAM Karl Berry <karl@HIDDEN> w=
rote:

>     +case "$PYTHON" in
>     +  *python*) ;;
>     +  *)
>     +  echo "$me: Invalid python executable ${PYTHON}";
>     +  echo "$me: Python support disabled";
>     +  exit 0;;
>     +esac
>
> Thanks. But I'm not sure about requiring the executable name to include
> "python". Apart from technically being against GNU standards, I can
> imagine people making a link named anything and then using that. For
> whatever reason.
>
> Maybe it would suffice to run $PYTHON -V and see if the result matches
> grep -i python?
>
> I don't have Python 2.0 (the oldest we claim to support, though I have
> my doubts), but it works with Python 2.7.
>
> $ python2.7 -V
> Python 2.7.18
>
> Wdyt? --thanks, karl.
>

That sounds reasonable.

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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Sun, Nov 24, 2024 at 3:05=E2=80=AF=
AM Karl Berry &lt;<a href=3D"mailto:karl@HIDDEN">karl@freefriends.=
org</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"marg=
in:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1e=
x">=C2=A0 =C2=A0 +case &quot;$PYTHON&quot; in<br>
=C2=A0 =C2=A0 +=C2=A0 *python*) ;;<br>
=C2=A0 =C2=A0 +=C2=A0 *)<br>
=C2=A0 =C2=A0 +=C2=A0 echo &quot;$me: Invalid python executable ${PYTHON}&q=
uot;;<br>
=C2=A0 =C2=A0 +=C2=A0 echo &quot;$me: Python support disabled&quot;;<br>
=C2=A0 =C2=A0 +=C2=A0 exit 0;;<br>
=C2=A0 =C2=A0 +esac<br>
<br>
Thanks. But I&#39;m not sure about requiring the executable name to include=
<br>
&quot;python&quot;. Apart from technically being against GNU standards, I c=
an<br>
imagine people making a link named anything and then using that. For<br>
whatever reason.<br>
<br>
Maybe it would suffice to run $PYTHON -V and see if the result matches<br>
grep -i python?<br>
<br>
I don&#39;t have Python 2.0 (the oldest we claim to support, though I have<=
br>
my doubts), but it works with Python 2.7.<br>
<br>
$ python2.7 -V<br>
Python 2.7.18<br>
<br>
Wdyt? --thanks, karl.<br></blockquote><div><br></div><div>That sounds reaso=
nable. <br></div></div></div>

--000000000000262d860627b77d80--
Information forwarded to automake-patches@HIDDEN:
bug#74434; Package automake-patches. Full text available.

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To: fberat@HIDDEN
Subject: Re: [bug#74434] [PATCH] py-compile: Allow user to disable python
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    +case "$PYTHON" in
    +  *python*) ;;
    +  *)
    +  echo "$me: Invalid python executable ${PYTHON}";
    +  echo "$me: Python support disabled";
    +  exit 0;;
    +esac

Thanks. But I'm not sure about requiring the executable name to include
"python". Apart from technically being against GNU standards, I can
imagine people making a link named anything and then using that. For
whatever reason.

Maybe it would suffice to run $PYTHON -V and see if the result matches
grep -i python?

I don't have Python 2.0 (the oldest we claim to support, though I have
my doubts), but it works with Python 2.7.

$ python2.7 -V
Python 2.7.18

Wdyt? --thanks, karl.
Information forwarded to automake-patches@HIDDEN:
bug#74434; Package automake-patches. Full text available.

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From: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20B=C3=A9rat?= <fberat@HIDDEN>
To: Karl Berry <karl@HIDDEN>
Subject: Re: [bug#74434] [PATCH] py-compile: Allow user to disable python
Date: Fri, 22 Nov 2024 13:27:10 +0100
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Hi,

Here is a revision of the patch, so that py-compile-en.sh test passes.
I leave to you to decide if a test dedicated to "PYTHON=:" is truly necessary.

Fred.

-- 8< --
Subject: [PATCH v2] py-compile: Allow user to disable python

Common practice is to set PYTHON=: to disable python support, which
breaks the current version of this script.
---
 lib/py-compile      |  8 ++++++++
 t/py-compile-env.sh | 20 ++++++++++----------
 2 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/lib/py-compile b/lib/py-compile
index c9d4fde94..332cb4b79 100755
--- a/lib/py-compile
+++ b/lib/py-compile
@@ -33,6 +33,14 @@ fi
 
 me=py-compile
 
+case "$PYTHON" in
+  *python*) ;;
+  *)
+  echo "$me: Invalid python executable ${PYTHON}";
+  echo "$me: Python support disabled";
+  exit 0;;
+esac
+
 usage_error ()
 {
   echo "$me: $*" >&2
diff --git a/t/py-compile-env.sh b/t/py-compile-env.sh
index b4ba6dcbe..7d8766b30 100644
--- a/t/py-compile-env.sh
+++ b/t/py-compile-env.sh
@@ -21,17 +21,17 @@
 cp "$am_scriptdir/py-compile" . \
   || fatal_ "failed to fetch auxiliary script py-compile"
 
-cat > my-py <<'END'
+cat > my-python <<'END'
 #!/bin/sh
 echo 2
-: > my-py.run
+: > my-python.run
 END
-chmod a+x my-py
+chmod a+x my-python
 
 mkdir sub1
 cd sub1
 
-PYTHON=false ../py-compile foo.py && exit 1
+! PYTHON=false ../py-compile foo.py && exit 1
 ls | grep . && exit 1
 
 PYTHON='echo GrEpMe AndMeToo' ../py-compile foo.py
@@ -42,16 +42,16 @@ cd ..
 mkdir sub2
 cd sub2
 
-PYTHON=../my-py ../py-compile foo.py
-test -f my-py.run
-ls | grep -v '^my-py\.run$' | grep . && exit 1
+PYTHON=../my-python ../py-compile foo.py
+test -f my-python.run
+ls | grep -v '^my-python\.run$' | grep . && exit 1
 
 cd ..
 mkdir sub3
 cd sub3
 PATH=..$PATH_SEPARATOR$PATH; export PATH
-PYTHON=my-py py-compile foo.py
-test -f my-py.run
-ls | grep -v '^my-py\.run$' | grep . && exit 1
+PYTHON=my-python py-compile foo.py
+test -f my-python.run
+ls | grep -v '^my-python\.run$' | grep . && exit 1
 
 :
-- 
2.47.0
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bug#74434; Package automake-patches. Full text available.

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From: Karl Berry <karl@HIDDEN>
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Subject: Re: [bug#74434] [PATCH] py-compile: Allow user to disable python
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    There may be a bit more thoughts needed to get the py-compile-env.sh test
    to work properly though.

Yes, we should add an explicit check for this PYTHON=: setting.
If you have time to munge around in the test(s), that would be great.
Else I'll get to it when I get to it. --thanks, karl.
Information forwarded to automake-patches@HIDDEN:
bug#74434; Package automake-patches. Full text available.

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Subject: Re: [bug#74434] [PATCH] py-compile: Allow user to disable python
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On Tue, Nov 19, 2024 at 10:29=E2=80=AFPM Karl Berry <karl@HIDDEN> =
wrote:

> Hi Frederic,
>
>     I believe this is a common practice
>
> Well, clearly no one had thought of it nor was it tried at any point
> during the lengthy automake pretest sequence, but anyway, agreed that
> there's no reason to gratuitously fail in this case.
>

> As for disabling pythong, it doesn't seem to me that setting PYTHON=3D:
> can really be considered equivalent to something like a --without-python
> option, but since it helps in some cases, that's fine. --thanks, karl.
>

Well, to rephrase: that is a construct I've already seen, not that I agree
or disagree with its usage in this usecase.

There may be a bit more thoughts needed to get the py-compile-env.sh test
to work properly though.

--000000000000b6e4e706275899cf
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Tue, Nov 19, 2024 at 10:29=E2=80=
=AFPM Karl Berry &lt;<a href=3D"mailto:karl@HIDDEN">karl@freefrien=
ds.org</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"m=
argin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left=
:1ex">Hi Frederic,<br>
<br>
=C2=A0 =C2=A0 I believe this is a common practice <br>
<br>
Well, clearly no one had thought of it nor was it tried at any point<br>
during the lengthy automake pretest sequence, but anyway, agreed that<br>
there&#39;s no reason to gratuitously fail in this case. <br></blockquote><=
blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l=
eft:1px solid rgb(204,204,204);padding-left:1ex">
<br>
As for disabling pythong, it doesn&#39;t seem to me that setting PYTHON=3D:=
<br>
can really be considered equivalent to something like a --without-python<br=
>
option, but since it helps in some cases, that&#39;s fine. --thanks, karl.<=
br></blockquote><div><br></div><div>Well, to rephrase: that is a construct =
I&#39;ve already seen, not that I agree or disagree with its usage in this =
usecase.<br></div><div><br></div><div>There may be a bit more thoughts need=
ed to get the py-compile-env.sh test to work properly though.<br></div></di=
v></div>

--000000000000b6e4e706275899cf--
Information forwarded to automake-patches@HIDDEN:
bug#74434; Package automake-patches. Full text available.

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Hi Frederic,

    I believe this is a common practice 

Well, clearly no one had thought of it nor was it tried at any point
during the lengthy automake pretest sequence, but anyway, agreed that
there's no reason to gratuitously fail in this case.

As for disabling pythong, it doesn't seem to me that setting PYTHON=:
can really be considered equivalent to something like a --without-python
option, but since it helps in some cases, that's fine. --thanks, karl.
Information forwarded to automake-patches@HIDDEN:
bug#74434; Package automake-patches. Full text available.

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


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Hello,

While integrating automake 1.17, I found that otf2 package build fails.
The failure is due to:
	py-compile: could not determine : major version

This is a side-effect of a rework of the py-compile script, which
formerly defaulted to python3 if there was an error while getting the
python version.

The new code doesn't have this fallback, and if users want to disable
python support by setting `PYTHON=:` as environment variable, the script
bails out.

I believe this is a common practice and that py-compile needs a fix. I
therefore propose the one below.

Feel free to tell me otherwise.

Fred.

-- 8< --
Subject: [PATCH] py-compile: Allow user to disable python

Common practice is to set PYTHON=: to disable python support, which
breaks the current version of this script.

Check that the PYTHON variable contains `python`, early exit otherwise.
---
 lib/py-compile | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/py-compile b/lib/py-compile
index c9d4fde94..0238bab2c 100755
--- a/lib/py-compile
+++ b/lib/py-compile
@@ -33,6 +33,13 @@ fi
 
 me=py-compile
 
+case "$PYTHON" in
+  *python*) ;;
+  *)
+  echo "$me: Python support disabled";
+  exit 0;;
+esac
+
 usage_error ()
 {
   echo "$me: $*" >&2
-- 
2.47.0
Acknowledgement sent to Frédéric Bérat <fberat@HIDDEN>:
New bug report received and forwarded. Copy sent to automake-patches@HIDDEN. Full text available.
Report forwarded to automake-patches@HIDDEN:
bug#74434; Package automake-patches. Full text available.
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GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.