(Separated out from another thread since this issue seems more general.)
I am planning to use 'git new-workdir', which basically lets several workspaces share a single .git/refs directory. (Among other dirs in .git) It's possible that I'll end up running 'git fetch' in these workspaces simultaneously, meaning they'll be trying to update .git/ref at the same time. Is this safe? I know there's a push-lock, but there doesn't seem to be a fetch-lock.
When I tried it, I got some errors:
Running 'git fetch' in window 1: --- khan% git fetch origin remote: Counting objects: 37, done. remote: Compressing objects: 100% (37/37), done. remote: Total 37 (delta 11), reused 0 (delta 0) Unpacking objects: 100% (37/37), done. From github.com:Khan/webapp 1f893f3..a9d6739 master -> origin/master 2641d9f..b630758 athena -> origin/athena + 2a83b90...b7ca8be chris -> origin/chris (forced update) 0e74194..a9d6739 sat -> origin/sat * [new tag] gae-1219-0726-b7ca8bef9b50 -> gae-1219-0726-b7ca8bef9b50 * [new tag] gae-1219-0908-a9d67391b44c -> gae-1219-0908-a9d67391b44c ---
Running 'git fetch' in window2 at the same time, in the same directory: --- khan% git fetch origin error: Ref refs/remotes/origin/master is at a9d67391b44cc8df8336afbc0b0a53691eae1bd4 but expected 1f893f3a4d78012964fc7fb93d1f61eacb1b4858 From github.com:Khan/webapp ! 1f893f3..a9d6739 master -> origin/master (unable to update local ref) error: Ref refs/remotes/origin/athena is at b63075834f77e494c56aade8ef8d7154f174865c but expected 2641d9ff052769aca8919c5528f02d65210a12cf ! 2641d9f..b630758 athena -> origin/athena (unable to update local ref) error: Ref refs/remotes/origin/chris is at b7ca8bef9b5011aa763104f1193b60dd91e0ba0c but expected 2a83b9042cfd1d73970cf0333910f4db978fbc71 ! 2a83b90...b7ca8be chris -> origin/chris (unable to update local ref) error: Ref refs/remotes/origin/sat is at a9d67391b44cc8df8336afbc0b0a53691eae1bd4 but expected 0e74194f8a07a13dbae023f88d9cdf2ddcc3566f ! 0e74194..a9d6739 sat -> origin/sat (unable to update local ref) * [new tag] gae-1219-0726-b7ca8bef9b50 -> gae-1219-0726-b7ca8bef9b50 * [new tag] gae-1219-0908-a9d67391b44c -> gae-1219-0908-a9d67391b44c ---
Are these errors benign, or is there the risk of corruption of some kind? Is there the possibility of corruption in other dirs as well, such as .git/objects?
Is it possible that both fetch's could prompt a gc run, and if so, is there a risk that two gc's running simultaneously could cause problems?
(Here's the full list of .git dirs shared across workspaces, according to https://github.com/git/git/blob/master/contrib/workdir/git-new-workdir): config refs logs/refs objects info hooks packed-refs remotes rr-cache svn
Thanks, craig