Unsync'd Git Repository in Dropbox

I have a git repository (and working directory) that is stored in my Dropbox so I can move back and forth between computers without having to commit or stash (read: without any effort at all). This is working great except for one minor annoyance that is becoming a major annoyance.

Every so often, I'll leave one computer in a fully committed state only to pick up on the other computer and find that a git status reports changes. Inevitably, those changes are related to permissions. What I'm not sure about is why? I assumed that it might be related to how Dropbox writes files on sync'd computers, but the umask on both systems is 开发者_高级运维set to 0002. I would assume that value dictates the mode of files written/updated by Dropbox, but it wouldn't be the first time I'd be wrong.

I know I can just tell Git to ignore the file mode, but that's just masking the problem. I'd really like to understand it so I can make an informed decision of how to proceed.

Thanks.

UPDATE

So here's a pretty decent representative example of a repository getting out of sync even though it's entirely contained within Dropbox. As we speak, my personal laptop is reporting a clean working directory for one of my projects:

$ git status
# On branch develop
nothing to commit (working directory clean)

My work laptop, though, reports a number of untracked files. Let me say that again: untracked files.

$ git status
# On branch develop
# Untracked files:
#   (use "git add <file>..." to include in what will be committed)
#
#   html/cake/console/libs/templates/
#   ...4 more files...
#   html/cake/tests/test_app/plugins/test_plugin/views/themed/
nothing added to commit but untracked files present (use "git add" to track)

How can that be? My ~/.gitignore file is also shared across both machines (not that any of these paths are excluded in an ignore file). Is there another component of Git--or maybe Dropbox--that could be in play here?

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I've gotten this exact problem under the same circumstances.

To stop the files showing in git status you can set git to ignore file mode changes:

git config core.filemode false

This change is local to the git repository and will be synced along with the files.

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You may want to check where you are setting your umask; it may be that dropbox is starting with a different umask than what your shell has. However, I believe that git ignores the group/other permissions and is mostly concerned with the execute bit, which should not be affected by the umask. Some thoughts for debugging:

• Can you reproduce this on-demand? How?
• What operating systems are you synchronizing between?
• If you git checkout -f on the files in question, do they get the correct permissions?
• If you simply chmod a file on one system, does that change get propagated?

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The fact you are using Macs is relevant - the Macworld Hints article mentioned in a comment explains the issue (but read down to the comment that explains how to fix permissions with chmod u+rwX etc, rather than absolute permissions that may mess things up).

This Dropbox Support answer explains what's probably going on and how to fix it - related to how MacOS X Leopard (10.5) changed the default usage of ACLs.