[Bug,default/31672] abidb: make libarchive a soft dependency

  https://sourceware.org/bugzilla/show_bug.cgi?id=31672

--- Comment #3 from Dodji Seketeli <dodji at seketeli dot org> ---
Dodji Seketeli <dodji@seketeli.org> a écrit:

[...]

> I came up with the potential commit below that is currently running
> through the build bots.  OK to apply if it passes tests?

Actually, the previous patch failed some tests on some platform where
the libarchive python module is missing.  This is because some code in
the main() function was still referencing the archive even though it is
not supported.  Adjusted thus.

Now, the updated patch below actually passes the test on all the tested
platforms.  OK to apply to the master branch?

From f41d17301f75fab61366bd7b568418d2a9c30567 Mon Sep 17 00:00:00 2001
From: "Frank Ch. Eigler" <fche@redhat.com>
Date: Fri, 26 Apr 2024 10:30:42 +0200
Subject: [PATCH] configure,abidb: Make the libarchive python module optional
for abidb

Some distributions don't have the libarchive python module packaged.

This patch makes that module optional and enables abidb to function
without it, as it's only necessary for the support of the '--archive'
command line option of the abidb program.

        * configure.ac: Detect the libarchive python module as an optional
        dependency for the abidb program.  So far, only the git python
        module remains a hard dependency.
        * tools/abidb (main): Do not support the '--archive' command line
        option if the libarchive python module is not present.

Signed-off-by: Dodji Seketeli <dodji@redhat.com>
---
 configure.ac | 15 +++++++++++++--
 tools/abidb  | 31 +++++++++++++++++++------------
 2 files changed, 32 insertions(+), 14 deletions(-)

     parser.add_argument('--sysroot',type=str,help='remove given sysroot prefix
from submitted file names',default=None)
     parser.add_argument('--filter',type=str,help='submit only binaries
matching given wildcard',default=r'/lib.*\.so') # sub-version suffixes will be
flattened into SONAME
     # --sysroot=PATH subtract this from SUBMIT paths
@@ -208,14 +213,15 @@ def main() -> list[str]:
         logging.info(f'checked out distrobranch {args.distrobranch} files
{numfiles}')

         ra = {}
-        for entry in args.archive: # parse / accumulate -Z EXT=CMD bits
-            extcmd = entry.split('=')
-            ext = extcmd[0]
-            if len(extcmd) == 1:
-                cmd = "cat" # default: pass through to libarchive
-            else:
-                cmd = "=".join(extcmd[1:]) # the rest of the command, filling
other ='s back in
-            ra["."+ext] = cmd
+        if enable_libarchive:
+            for entry in args.archive: # parse / accumulate -Z EXT=CMD bits
+                extcmd = entry.split('=')
+                ext = extcmd[0]
+                if len(extcmd) == 1:
+                    cmd = "cat" # default: pass through to libarchive
+                else:
+                    cmd = "=".join(extcmd[1:]) # the rest of the command,
filling other ='s back in
+                    ra["."+ext] = cmd


         def submit_file_generator(args):
@@ -230,6 +236,7 @@ def main() -> list[str]:
                         ln = submit
                     yield (None, ln, pn) # must be a plain file # XXX or
ldconfig-created symlink, ugh
                 else: # an archive!
+                    assert enable_libarchive
                     cmd = ra[ext]
                     if (cmd == "cat"): # short-circuit this
                         with libarchive.file_reader(submit) as archive: