commit:     f77fcd6b0b4ebb49ca62f5767cd5c931127c3dbb
Author:     Michał Górny <mgorny <AT> gentoo <DOT> org>
AuthorDate: Sun Oct 30 19:14:11 2016 +0000
Commit:     Michał Górny <mgorny <AT> gentoo <DOT> org>
CommitDate: Sun Oct 30 21:23:30 2016 +0000
URL:        https://gitweb.gentoo.org/proj/portage.git/commit/?id=f77fcd6b

[sync] Run `git update-index --refresh` when doing shallow pulls

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.

Reviewed-by: Zac Medico <zmedico <AT> gentoo.org>

 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)

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