[gentoo-portage-dev] [PATCH] [sync] Run `git update-index --refresh` when doing shallow pulls

[Michał Górny]

Run `git update-index --refresh` to force proper index recheck before
running `git reset --merge` on a shallow pull. This fixes syncing on
some filesystem configurations including overlayfs on squashfs.
---
 pym/portage/sync/modules/git/git.py | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/pym/portage/sync/modules/git/git.py b/pym/portage/sync/modules/git/git.py
index 3734b80..dc94ec9 100644
--- a/pym/portage/sync/modules/git/git.py
+++ b/pym/portage/sync/modules/git/git.py
@@ -89,7 +89,7 @@ class GitSync(NewBase):
 		else:
 			# Since the default merge strategy typically fails when
 			# the depth is not unlimited, use `git fetch` followed by
-			# `git reset --merge`.
+			# `git update-index --refresh`, then `git reset --merge`.
 			try:
 				remote_branch = portage._unicode_decode(
 					subprocess.check_output([self.bin_command, 'rev-parse',
@@ -116,12 +116,23 @@ class GitSync(NewBase):
 			**self.spawn_kwargs)
 
 		if exitcode == os.EX_OK and self.repo.sync_depth is not None:
-			reset_cmd = [self.bin_command, 'reset', '--merge', remote_branch]
-			if quiet:
-				reset_cmd.append('--quiet')
-			exitcode = subprocess.call(reset_cmd,
+			# update-index --refresh is needed on some filesystems
+			# (e.g. with overlayfs on squashfs)
+			update_index_cmd = [self.bin_command, 'update-index']
+			if quiet: # -q needs to go first
+				update_index_cmd.append('-q')
+			update_index_cmd.append('--refresh')
+
+			exitcode = subprocess.call(update_index_cmd,
 				cwd=portage._unicode_encode(self.repo.location))
 
+			if exitcode == os.EX_OK:
+				reset_cmd = [self.bin_command, 'reset', '--merge', remote_branch]
+				if quiet:
+					reset_cmd.append('--quiet')
+				exitcode = subprocess.call(reset_cmd,
+					cwd=portage._unicode_encode(self.repo.location))
+
 		if exitcode != os.EX_OK:
 			msg = "!!! git pull error in %s" % self.repo.location
 			self.logger(self.xterm_titles, msg)
-- 
2.10.2