[gcc r12-6545] Simplify git-backport.py script.

[gcc r12-6545] Simplify git-backport.py script.

[Martin Liska]

https://gcc.gnu.org/g:db0d23722e8b8daa54203f537729f578f3809c15

commit r12-6545-gdb0d23722e8b8daa54203f537729f578f3809c15
Author: Martin Liska <mliska@suse.cz>
Date:   Thu Jan 13 11:45:46 2022 +0100

    Simplify git-backport.py script.
    
    It's very unlikely that somebody is going to backport a revision
    that is > 14 months old to a release branch.
    
    contrib/ChangeLog:
    
            * git-backport.py: Simplify the script as pre-auto-ChangeLog era
            is 14 months old.

Diff:
---
 contrib/git-backport.py | 39 ++-------------------------------------
 1 file changed, 2 insertions(+), 37 deletions(-)

diff --git a/contrib/git-backport.py b/contrib/git-backport.py
index 2b8e4686719..bc2907a14ed 100755
--- a/contrib/git-backport.py
+++ b/contrib/git-backport.py
@@ -23,43 +23,8 @@ import argparse
 import subprocess
 
 if __name__ == '__main__':
-    parser = argparse.ArgumentParser(description='Backport a git revision and '
-                                     'stash all ChangeLog files.')
+    parser = argparse.ArgumentParser(description='Backport a git revision.')
     parser.add_argument('revision', help='Revision')
     args = parser.parse_args()
 
-    r = subprocess.run('git cherry-pick -x %s' % args.revision, shell=True)
-    if r.returncode == 0:
-        cmd = 'git show --name-only --pretty="" -- "*ChangeLog"'
-        changelogs = subprocess.check_output(cmd, shell=True, encoding='utf8')
-        changelogs = changelogs.strip()
-        if changelogs:
-            for changelog in changelogs.split('\n'):
-                subprocess.check_output('git checkout HEAD~ %s' % changelog,
-                                        shell=True)
-        subprocess.check_output('git commit --amend --no-edit', shell=True)
-    else:
-        # 1) remove all ChangeLog files from conflicts
-        out = subprocess.check_output('git diff --name-only --diff-filter=U',
-                                      shell=True,
-                                      encoding='utf8')
-        conflicts = out.strip().split('\n')
-        changelogs = [c for c in conflicts if c.endswith('ChangeLog')]
-        if changelogs:
-            cmd = 'git checkout --theirs %s' % ' '.join(changelogs)
-            subprocess.check_output(cmd, shell=True)
-        # 2) remove all ChangeLog files from index
-        cmd = 'git diff --name-only --diff-filter=M HEAD'
-        out = subprocess.check_output(cmd, shell=True, encoding='utf8')
-        out = out.strip().split('\n')
-        modified = [c for c in out if c.endswith('ChangeLog')]
-        for m in modified:
-            subprocess.check_output('git reset %s' % m, shell=True)
-            subprocess.check_output('git checkout %s' % m, shell=True)
-
-        # try to continue
-        if len(conflicts) == len(changelogs):
-            cmd = 'git -c core.editor=true cherry-pick --continue'
-            subprocess.check_output(cmd, shell=True)
-        else:
-            print('Please resolve all remaining file conflicts.')
+    subprocess.run('git cherry-pick -x %s' % args.revision, shell=True)