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project: abort a bit earlier before migrating .git/

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Verify all the .git/ paths will be handled by the migration logic before
starting the migration.  This way we still abort & log an error, but the
user gets to see it before we put the tree into a state that they have to
manually recover.  Also add a few more known-safe-to-clobber paths.

Bug: https://crbug.com/gerrit/15273
Change-Id: If49d69b341bc960ddcafa30da333fb5ec7145b51
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/327557
Reviewed-by: Colin Cross <ccross@android.com>
Tested-by: Mike Frysinger <vapier@google.com>
This commit is contained in:
Mike Frysinger 2022-01-06 05:42:24 -05:00
parent 71e48b7672
commit 89ed8acdbe
2 changed files with 53 additions and 13 deletions
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38
project.py
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@ -2818,24 +2818,40 @@ class Project(object):
}
# Paths that we know will be in both, but are safe to clobber in .repo/projects/.
SAFE_TO_CLOBBER = {
'COMMIT_EDITMSG', 'FETCH_HEAD', 'HEAD', 'index', 'ORIG_HEAD',
'COMMIT_EDITMSG', 'FETCH_HEAD', 'HEAD', 'gitk.cache', 'index', 'ORIG_HEAD',
}
# First see if we'd succeed before starting the migration.
unknown_paths = []
for name in platform_utils.listdir(dotgit):
# Ignore all temporary/backup names. These are common with vim & emacs.
if name.endswith('~') or (name[0] == '#' and name[-1] == '#'):
continue
dotgit_path = os.path.join(dotgit, name)
if name in KNOWN_LINKS:
if not platform_utils.islink(dotgit_path):
unknown_paths.append(f'{dotgit_path}: should be a symlink')
else:
gitdir_path = os.path.join(gitdir, name)
if name not in SAFE_TO_CLOBBER and os.path.exists(gitdir_path):
unknown_paths.append(f'{dotgit_path}: unknown file; please file a bug')
if unknown_paths:
raise GitError('Aborting migration: ' + '\n'.join(unknown_paths))
# Now walk the paths and sync the .git/ to .repo/projects/.
for name in platform_utils.listdir(dotgit):
dotgit_path = os.path.join(dotgit, name)
if name in KNOWN_LINKS:
if platform_utils.islink(dotgit_path):
platform_utils.remove(dotgit_path)
else:
raise GitError(f'{dotgit_path}: should be a symlink')
# Ignore all temporary/backup names. These are common with vim & emacs.
if name.endswith('~') or (name[0] == '#' and name[-1] == '#'):
platform_utils.remove(dotgit_path)
elif name in KNOWN_LINKS:
platform_utils.remove(dotgit_path)
else:
gitdir_path = os.path.join(gitdir, name)
if name in SAFE_TO_CLOBBER or not os.path.exists(gitdir_path):
platform_utils.remove(gitdir_path, missing_ok=True)
platform_utils.rename(dotgit_path, gitdir_path)
else:
raise GitError(f'{dotgit_path}: unknown file; please file a bug')
platform_utils.remove(gitdir_path, missing_ok=True)
platform_utils.rename(dotgit_path, gitdir_path)
# Now that the dir should be empty, clear it out, and symlink it over.
platform_utils.rmdir(dotgit)