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65 lines
2.4 KiB
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65 lines
2.4 KiB
Plaintext
From: Junio C Hamano <junkio@cox.net>
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Subject: Resetting paths
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Date: Thu, 09 Feb 2006 20:40:15 -0800
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Message-ID: <7vlkwjzv0w.fsf@assigned-by-dhcp.cox.net>
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Content-Type: text/plain; charset=us-ascii
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Return-path: <git-owner@vger.kernel.org>
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While working on "assume unchanged" git series, I found one
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thing missing from the current set of tools.
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While I worked on parts of the system that deals with the cached
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lstat() information, I needed a way to debug that, so I hacked
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ls-files -t option to show entries marked as "always matches the
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index" with lowercase tag letters. This was primarily debugging
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aid hack.
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Then I committed the whole thing with "git commit -a" by
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mistake. In order to rewind the HEAD to pre-commit state, I can
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say "git reset --soft HEAD^", but after doing that, now I want
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to unupdate the index so that ls-files.c matches the pre-commit
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HEAD.
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"git reset --mixed" is a heavy-handed tool for that. It reads
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the entier index from the HEAD commit without touching the
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working tree, so I would need to add the modified paths back
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with "git update-index".
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The low-level voodoo to do so for this particular case is this
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single liner:
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git ls-tree HEAD ls-files.c | git update-index --index-info
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Have people found themselves in similar need like this? This
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could take different forms.
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* you did "git update-index" on a wrong path. This is my
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example and the above voodoo is a recipe for recovery.
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* you did "git add" on a wrong path and you want to remove it.
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This is easier than the above:
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git update-index --force-remove path
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* you did the above recovery from "git add" on a wrong path,
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and you want to add it again. The same voodoo would work in
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this case as well.
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git ls-tree HEAD path | git update-index --index-info
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We could add "git reset path..." to reduce typing for the above,
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but I am wondering if it is worth it.
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BTW, this shows how "index centric" git is. With other SCM that
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has only the last commit and the working tree files, you do not
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have to worry any of these things, so it might appear that index
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is just a nuisance. But if you do not have any "registry of
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paths to be committed", you cannot do a partial commit like what
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I did above ("commit changes to all files other than
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ls-files.c") without listing all the paths to be committed, or
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fall back on CVS style "one path at a time", breaking an atomic
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commit, so there is a drawback for not having an index as well.
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