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Subject: [bug#73795] [PATCH] Add support for the bzip3 compression tool to automake.
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bzip3 (https://github.com/kspalaiologos/bzip3) is a free and open-source LGPLv3-licensed data
compression utility that excels at compressing text and source code.

Compression ratio tests for the automake distribution tarball:
% wc -c *tar*
1885428 automake-1.17.0.91.tar.bz2
1500817 automake-1.17.0.91.tar.bz3
2456935 automake-1.17.0.91.tar.gz
1641112 automake-1.17.0.91.tar.xz

---
 bin/automake.in         | 3 ++-
 lib/Automake/Options.pm | 1 +
 lib/am/distdir.am       | 9 +++++++++
 t/dist-formats.tap      | 1 +
 4 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/bin/automake.in b/bin/automake.in
index a17f45236..30d82bb96 100644
--- a/bin/automake.in
+++ b/bin/automake.in
@@ -3856,7 +3856,7 @@ sub handle_dist ()
     {
       my $archive_defined = option 'no-dist-gzip' ? 0 : 1;
       $archive_defined ||=
-	grep { option "dist-$_" } qw(shar zip tarZ bzip2 lzip xz zstd);
+	grep { option "dist-$_" } qw(shar zip tarZ bzip2 bzip3 lzip xz zstd);
       error (option 'no-dist-gzip',
 	     "no-dist-gzip specified but no dist-* specified,\n"
 	     . "at least one archive format must be enabled")
@@ -6898,6 +6898,7 @@ sub preprocess_file
 		 'XZ'          => !! option 'dist-xz',
 		 'LZIP'        => !! option 'dist-lzip',
 		 'BZIP2'       => !! option 'dist-bzip2',
+		 'BZIP3'       => !! option 'dist-bzip3',
 		 'COMPRESS'    => !! option 'dist-tarZ',
 		 'GZIP'        =>  ! option 'no-dist-gzip',
 		 'SHAR'        => !! option 'dist-shar',
diff --git a/lib/Automake/Options.pm b/lib/Automake/Options.pm
index 2dc7899f8..d08af3ef1 100644
--- a/lib/Automake/Options.pm
+++ b/lib/Automake/Options.pm
@@ -275,6 +275,7 @@ sub _is_valid_easy_option ($)
     color-tests
     dejagnu
     dist-bzip2
+    dist-bzip3
     dist-lzip
     dist-xz
     dist-zip
diff --git a/lib/am/distdir.am b/lib/am/distdir.am
index c85f6a325..4a7534f98 100644
--- a/lib/am/distdir.am
+++ b/lib/am/distdir.am
@@ -343,6 +343,12 @@ dist-bzip2: distdir
 	tardir=$(distdir) && $(am__tar) | BZIP2=$${BZIP2--9} bzip2 -c >$(distdir).tar.bz2
 	$(am__post_remove_distdir)

+?BZIP3?DIST_ARCHIVES += $(distdir).tar.bz3
+.PHONY: dist-bzip3
+dist-bzip3: distdir
+	tardir=$(distdir) && $(am__tar) | BZIP2=$${BZIP2--9} bzip3 -c >$(distdir).tar.bz3
+	$(am__post_remove_distdir)
+
 ?LZIP?DIST_ARCHIVES += $(distdir).tar.lz
 .PHONY: dist-lzip
 dist-lzip: distdir
@@ -390,6 +396,7 @@ dist-zip: distdir
 ?XZ?DIST_TARGETS += dist-xz
 ?SHAR?DIST_TARGETS += dist-shar
 ?BZIP2?DIST_TARGETS += dist-bzip2
+?BZIP3?DIST_TARGETS += dist-bzip3
 ?GZIP?DIST_TARGETS += dist-gzip
 ?ZIP?DIST_TARGETS += dist-zip
 ?ZSTD?DIST_TARGETS += dist-zstd
@@ -443,6 +450,8 @@ distcheck: dist
 	  eval GZIP= gzip -dc $(distdir).tar.gz | $(am__untar) ;;\
 	*.tar.bz2*) \
 	  bzip2 -dc $(distdir).tar.bz2 | $(am__untar) ;;\
+	*.tar.bz3*) \
+	  bzip3 -dc $(distdir).tar.bz3 | $(am__untar) ;;\
 	*.tar.lz*) \
 	  lzip -dc $(distdir).tar.lz | $(am__untar) ;;\
 	*.tar.xz*) \
diff --git a/t/dist-formats.tap b/t/dist-formats.tap
index 34d88b67c..13250327c 100644
--- a/t/dist-formats.tap
+++ b/t/dist-formats.tap
@@ -59,6 +59,7 @@ setup_vars_for_compression_format ()
     lzip) suffix=tar.lz  compressor=lzip     ;;
       xz) suffix=tar.xz  compressor=xz       ;;
    bzip2) suffix=tar.bz2 compressor=bzip2    ;;
+   bzip3) suffix=tar.bz3 compressor=bzip3    ;;
      zip) suffix=zip     compressor=zip      ;;
     zstd) suffix=tar.zst compressor=zstd     ;;
        *) fatal_ "invalid compression format '$1'";;
-- 
2.45.2

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Kamila Szewczyk <kspalaiologos@HIDDEN>
Subject: bug#73795: Acknowledgement ([PATCH] Add support for the bzip3
 compression tool to automake.)
Message-ID: <handler.73795.B.172883659314411.ack <at> debbugs.gnu.org>
References: <43207a7f-f799-4f3a-ae96-338e0938d48c@HIDDEN>
X-Gnu-PR-Message: ack 73795
X-Gnu-PR-Package: automake-patches
X-Gnu-PR-Keywords: patch
Reply-To: 73795 <at> debbugs.gnu.org
Date: Sun, 13 Oct 2024 16:24:02 +0000

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Message sent to automake-patches@HIDDEN:

Subject: [bug#73795] [PATCH] Add support for the bzip3 compression tool to automake.
References: <43207a7f-f799-4f3a-ae96-338e0938d48c@HIDDEN>
Resent-From: Karl Berry <karl@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
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To: kspalaiologos@HIDDEN
Cc: 73795 <at> debbugs.gnu.org
Date: Sun, 13 Oct 2024 16:03:41 -0600
Message-Id: <202410132203.49DM3f4K1633953@HIDDEN>
From: Karl Berry <karl@HIDDEN>
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Hi Kamila - thanks much for the patch.

    % wc -c *tar*
    1885428 automake-1.17.0.91.tar.bz2
    1500817 automake-1.17.0.91.tar.bz3
    2456935 automake-1.17.0.91.tar.gz
    1641112 automake-1.17.0.91.tar.xz

That is an impressive compression ratio.

    LGPLv3-licensed

I searched for bzip3 on pkgs.org and it said the license was 
LGPL-3.0-or-later AND BSD-2-Clause. Which is good, if true, because
LGPLv3 is not compatible with GPLv2-only.
https://rhel.pkgs.org/9/epel-x86_64/bzip3-1.3.1-1.el9.x86_64.rpm.html

But main.c only says LGPLv3, so I'm not sure what to make of that.
Can you clarify? Not that it's a stopper.

Also not a stopper, but I just wonder, what is the relationship to
bzip3? It seems there is, basically, none.  I presume you are not Julian
Seward by another name :).  I don't understand the "spiritual"
connection, sorry. But it's surely too late to rename it anyway, so it
doesn't matter.

Thanks again,
Karl

Message sent to automake-patches@HIDDEN:

Subject: [bug#73795] [PATCH] Add support for the bzip3 compression tool to automake.
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From: Kamila Szewczyk <kspalaiologos@HIDDEN>
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Hi Karl,

Thank *you* for the quick response. The AND implies that the package contains both LGPLv3.0 and
BSD-licensed code (in particular e.g. Rich Felker's getopt shim) - it is not dual-licensed. However,
for all intents and purposes I hereby grant the GNU Project permission to use it in any GPLv2
licensed package.

The "spiritual" connection primarily lies in the algorithmic matters: bzip3 is actually more similar
to bzip than bzip2 - the former being abandoned due to patent issues on arithmetic coding, which are
not a problem nowadays. Both codecs are statistical and make use of the Burrows-Wheeler transform.
Hence, bzip3 really stands for Burrows-wheeler ZIP, but versions one and two were taken.

To my knowledge, Julian does not have a trademark on the bzip series, which itself doesn't seem to
infringe the IP of Katz' original PKZIP.

--
Yours,
Kamila Szewczyk

On 10/14/24 12:03 AM, Karl Berry wrote:
> Hi Kamila - thanks much for the patch.
> 
>     % wc -c *tar*
>     1885428 automake-1.17.0.91.tar.bz2
>     1500817 automake-1.17.0.91.tar.bz3
>     2456935 automake-1.17.0.91.tar.gz
>     1641112 automake-1.17.0.91.tar.xz
> 
> That is an impressive compression ratio.
> 
>     LGPLv3-licensed
> 
> I searched for bzip3 on pkgs.org and it said the license was 
> LGPL-3.0-or-later AND BSD-2-Clause. Which is good, if true, because
> LGPLv3 is not compatible with GPLv2-only.
> https://rhel.pkgs.org/9/epel-x86_64/bzip3-1.3.1-1.el9.x86_64.rpm.html
> 
> But main.c only says LGPLv3, so I'm not sure what to make of that.
> Can you clarify? Not that it's a stopper.
> 
> Also not a stopper, but I just wonder, what is the relationship to
> bzip3? It seems there is, basically, none.  I presume you are not Julian
> Seward by another name :).  I don't understand the "spiritual"
> connection, sorry. But it's surely too late to rename it anyway, so it
> doesn't matter.
> 
> Thanks again,
> Karl

Last modified: Sun, 12 Jan 2025 05:45:02 UTC

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