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authorLibravatar Jeff King <peff@peff.net>2011-03-30 15:53:19 -0400
committerLibravatar Junio C Hamano <gitster@pobox.com>2011-03-30 13:47:53 -0700
commita9f5a3558dcf83440c60ae5a2e2b56c80d65bb0b (patch)
tree98937f314b51230a2ee144b8ecbd4779f9c2eee2 /contrib/hooks/pre-auto-gc-battery
parentremote: disallow some nonsensical option combinations (diff)
downloadtgif-a9f5a3558dcf83440c60ae5a2e2b56c80d65bb0b.tar.xz
remote: separate the concept of push and fetch mirrors
git-remote currently has one option, "--mirror", which sets up mirror configuration which can be used for either fetching or pushing. It looks like this: [remote "mirror"] url = wherever fetch = +refs/*:refs/* mirror = true However, a remote like this can be dangerous and confusing. Specifically: 1. If you issue the wrong command, it can be devastating. You are not likely to "push" when you meant to "fetch", but "git remote update" will try to fetch it, even if you intended the remote only for pushing. In either case, the results can be quite destructive. An unintended push will overwrite or delete remote refs, and an unintended fetch can overwrite local branches. 2. The tracking setup code can produce confusing results. The fetch refspec above means that "git checkout -b new master" will consider refs/heads/master to come from the remote "mirror", even if you only ever intend to push to the mirror. It will set up the "new" branch to track mirror's refs/heads/master. 3. The push code tries to opportunistically update tracking branches. If you "git push mirror foo:bar", it will see that we are updating mirror's refs/heads/bar, which corresponds to our local refs/heads/bar, and will update our local branch. To solve this, we split the concept into "push mirrors" and "fetch mirrors". Push mirrors set only remote.*.mirror, solving (2) and (3), and making an accidental fetch write only into FETCH_HEAD. Fetch mirrors set only the fetch refspec, meaning an accidental push will not force-overwrite or delete refs on the remote end. The new syntax is "--mirror=<fetch|push>". For compatibility, we keep "--mirror" as-is, setting up both types simultaneously. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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