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81 lines
2.6 KiB
81 lines
2.6 KiB
Date: Sat, 13 Aug 2005 22:16:02 -0700 (PDT) |
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From: Linus Torvalds <torvalds@osdl.org> |
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To: Steve French <smfrench@austin.rr.com> |
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cc: git@vger.kernel.org |
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Subject: Re: sending changesets from the middle of a git tree |
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Abstract: In this article, Linus demonstrates how a broken commit |
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in a sequence of commits can be removed by rewinding the head and |
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reapplying selected changes. |
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On Sat, 13 Aug 2005, Linus Torvalds wrote: |
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> That's correct. Same things apply: you can move a patch over, and create a |
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> new one with a modified comment, but basically the _old_ commit will be |
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> immutable. |
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Let me clarify. |
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You can entirely _drop_ old branches, so commits may be immutable, but |
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nothing forces you to keep them. Of course, when you drop a commit, you'll |
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always end up dropping all the commits that depended on it, and if you |
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actually got somebody else to pull that commit you can't drop it from |
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_their_ repository, but undoing things is not impossible. |
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For example, let's say that you've made a mess of things: you've committed |
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three commits "old->a->b->c", and you notice that "a" was broken, but you |
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want to save "b" and "c". What you can do is |
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# Create a branch "broken" that is the current code |
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# for reference |
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git branch broken |
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# Reset the main branch to three parents back: this |
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# effectively undoes the three top commits |
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git reset HEAD^^^ |
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git checkout -f |
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# Check the result visually to make sure you know what's |
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# going on |
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gitk --all |
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# Re-apply the two top ones from "broken" |
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# |
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# First "parent of broken" (aka b): |
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git-diff-tree -p broken^ | git-apply --index |
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git commit --reedit=broken^ |
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# Then "top of broken" (aka c): |
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git-diff-tree -p broken | git-apply --index |
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git commit --reedit=broken |
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and you've now re-applied (and possibly edited the comments) the two |
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commits b/c, and commit "a" is basically gone (it still exists in the |
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"broken" branch, of course). |
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Finally, check out the end result again: |
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# Look at the new commit history |
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gitk --all |
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to see that everything looks sensible. |
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And then, you can just remove the broken branch if you decide you really |
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don't want it: |
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# remove 'broken' branch |
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rm .git/refs/heads/broken |
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# Prune old objects if you're really really sure |
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git prune |
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And yeah, I'm sure there are other ways of doing this. And as usual, the |
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above is totally untested, and I just wrote it down in this email, so if |
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I've done something wrong, you'll have to figure it out on your own ;) |
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Linus |
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- |
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