apertis-abi-compare: don't fail in case of soname change

When the soname changes, the name of the binary package changes
accordingly. In this case, ABI breakage is expected thus there is
no need to run abi-compliance-checker. apertis-abi-compare detects
this case and report the soname change without failing.

Signed-off-by: Dylan Aïssi <dylan.aissi@collabora.com>

tools/apertis-abi-compare

@@ -273,7 +273,27 @@ def main():
         subprocess.run(['/usr/bin/apt', 'download', bin_deb],
                        cwd=folder_old_bin)
 
-    my_old_deb = list(pathlib.Path(folder_old_bin).glob('*.deb'))[0]
+    list_old_debs = list(pathlib.Path(folder_old_bin).glob('*.deb'))
+    print(f'INFO: {len(list_old_debs)} old packages have been downloaded!')
+    if len(list_old_debs) == 0:
+        print('INFO: Checking if similar packages are available in apt repositories')
+        for bin_deb in list_bin_deb:
+            if re.search('\d$', bin_deb):
+                libbin_deb = re.sub('(\d*[\.]*)*\d$', '', bin_deb)
+                my_libbin_deb = libbin_deb + '[0-9]$'
+                print(f'INFO:  ...searching for {libbin_deb} in apt')
+                apt_search = subprocess.run(['/usr/bin/apt-cache', 'search', '--names-only', my_libbin_deb], capture_output=True)
+                my_oldlibbin_deb = apt_search.stdout.decode('utf-8').split(' - ')[0]
+                if len(my_oldlibbin_deb) < 1:
+                    print('INFO: No previous packages available in apt repositories for comparison\n'
+                          f'INFO: Could this be the first release of {libbin_deb}?')
+                else:
+                    print(f'INFO: soname change detected for {bin_deb}')
+                    print(f'INFO: {my_oldlibbin_deb} is available in apt repositories')
+                    print('INFO: ABI breakage expected, no need to run abi-compliance-checker')
+        sys.exit(0)
+
+    my_old_deb = list_old_debs[0]
     my_old_deb = debfile.DebFile(my_old_deb)
     my_old_debcontrol = my_old_deb.debcontrol()
     my_old_ver = my_old_debcontrol['Version']