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![Junio C Hamano](/assets/img/avatar_default.png)
This new option does essentially the same thing as -m option when checking unmerged paths out of the index, but it uses the specified style instead of configured merge.conflictstyle. Setting "merge.conflictstyle" to "diff3" is usually less useful than using the default "merge" style, because the latter allows a conflict that results by both sides changing the same region in a very similar way to get simplified substancially by reducing the common lines. However, when one side removed a group of lines (perhaps a function was moved to some other file) while the other side modified it, the default "merge" style does not give any clue as to why the hunk is left conflicting. You would need the original to understand what is going on. The recommended use would be not to set merge.conflictstyle variable so that you would usually use the default "merge" style conflict, and when the result in a path in a particular merge is too hard to understand, use "git checkout --conflict=diff3 $path" to check it out with the original to review what is going on. Signed-off-by: Junio C Hamano <gitster@pobox.com>
247 lines
7.8 KiB
Plaintext
247 lines
7.8 KiB
Plaintext
git-checkout(1)
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===============
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NAME
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----
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git-checkout - Checkout a branch or paths to the working tree
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SYNOPSIS
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--------
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[verse]
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'git checkout' [-q] [-f] [[--track | --no-track] -b <new_branch> [-l]] [-m] [<branch>]
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'git checkout' [-f|--ours|--theirs|-m|--conflict=<style>] [<tree-ish>] [--] <paths>...
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DESCRIPTION
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-----------
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When <paths> are not given, this command switches branches by
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updating the index and working tree to reflect the specified
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branch, <branch>, and updating HEAD to be <branch> or, if
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specified, <new_branch>. Using -b will cause <new_branch> to
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be created; in this case you can use the --track or --no-track
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options, which will be passed to `git branch`.
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When <paths> are given, this command does *not* switch
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branches. It updates the named paths in the working tree from
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the index file, or from a named commit. In
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this case, the `-b` options is meaningless and giving
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either of them results in an error. <tree-ish> argument can be
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used to specify a specific tree-ish (i.e. commit, tag or tree)
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to update the index for the given paths before updating the
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working tree.
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The index may contain unmerged entries after a failed merge. By
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default, if you try to check out such an entry from the index, the
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checkout operation will fail and nothing will be checked out.
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Using -f will ignore these unmerged entries. The contents from a
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specific side of the merge can be checked out of the index by
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using --ours or --theirs. With -m, changes made to the working tree
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file can be discarded to recreate the original conflicted merge result.
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OPTIONS
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-------
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-q::
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Quiet, suppress feedback messages.
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-f::
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When switching branches, proceed even if the index or the
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working tree differs from HEAD. This is used to throw away
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local changes.
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+
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When checking out paths from the index, do not fail upon unmerged
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entries; instead, unmerged entries are ignored.
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--ours::
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--theirs::
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When checking out paths from the index, check out stage #2
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('ours') or #3 ('theirs') for unmerged paths.
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-b::
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Create a new branch named <new_branch> and start it at
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<branch>. The new branch name must pass all checks defined
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by linkgit:git-check-ref-format[1]. Some of these checks
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may restrict the characters allowed in a branch name.
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-t::
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--track::
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When creating a new branch, set up configuration so that 'git-pull'
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will automatically retrieve data from the start point, which must be
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a branch. Use this if you always pull from the same upstream branch
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into the new branch, and if you don't want to use "git pull
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<repository> <refspec>" explicitly. This behavior is the default
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when the start point is a remote branch. Set the
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branch.autosetupmerge configuration variable to `false` if you want
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'git-checkout' and 'git-branch' to always behave as if '--no-track' were
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given. Set it to `always` if you want this behavior when the
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start-point is either a local or remote branch.
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--no-track::
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Ignore the branch.autosetupmerge configuration variable.
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-l::
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Create the new branch's reflog. This activates recording of
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all changes made to the branch ref, enabling use of date
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based sha1 expressions such as "<branchname>@\{yesterday}".
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-m::
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--merge::
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When switching branches,
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if you have local modifications to one or more files that
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are different between the current branch and the branch to
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which you are switching, the command refuses to switch
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branches in order to preserve your modifications in context.
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However, with this option, a three-way merge between the current
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branch, your working tree contents, and the new branch
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is done, and you will be on the new branch.
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+
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When a merge conflict happens, the index entries for conflicting
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paths are left unmerged, and you need to resolve the conflicts
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and mark the resolved paths with `git add` (or `git rm` if the merge
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should result in deletion of the path).
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+
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When checking out paths from the index, this option lets you recreate
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the conflicted merge in the specified paths.
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--conflict=<style>::
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The same as --merge option above, but changes the way the
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conflicting hunks are presented, overriding the
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merge.conflictstyle configuration variable. Possible values are
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"merge" (default) and "diff3" (in addition to what is shown by
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"merge" style, shows the original contents).
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<new_branch>::
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Name for the new branch.
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<branch>::
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Branch to checkout; may be any object ID that resolves to a
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commit. Defaults to HEAD.
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+
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When this parameter names a non-branch (but still a valid commit object),
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your HEAD becomes 'detached'.
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Detached HEAD
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-------------
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It is sometimes useful to be able to 'checkout' a commit that is
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not at the tip of one of your branches. The most obvious
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example is to check out the commit at a tagged official release
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point, like this:
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------------
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$ git checkout v2.6.18
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------------
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Earlier versions of git did not allow this and asked you to
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create a temporary branch using `-b` option, but starting from
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version 1.5.0, the above command 'detaches' your HEAD from the
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current branch and directly point at the commit named by the tag
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(`v2.6.18` in the above example).
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You can use usual git commands while in this state. You can use
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`git reset --hard $othercommit` to further move around, for
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example. You can make changes and create a new commit on top of
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a detached HEAD. You can even create a merge by using `git
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merge $othercommit`.
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The state you are in while your HEAD is detached is not recorded
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by any branch (which is natural --- you are not on any branch).
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What this means is that you can discard your temporary commits
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and merges by switching back to an existing branch (e.g. `git
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checkout master`), and a later `git prune` or `git gc` would
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garbage-collect them. If you did this by mistake, you can ask
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the reflog for HEAD where you were, e.g.
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------------
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$ git log -g -2 HEAD
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------------
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EXAMPLES
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--------
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. The following sequence checks out the `master` branch, reverts
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the `Makefile` to two revisions back, deletes hello.c by
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mistake, and gets it back from the index.
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------------
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$ git checkout master <1>
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$ git checkout master~2 Makefile <2>
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$ rm -f hello.c
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$ git checkout hello.c <3>
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------------
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<1> switch branch
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<2> take out a file out of other commit
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<3> restore hello.c from HEAD of current branch
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If you have an unfortunate branch that is named `hello.c`, this
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step would be confused as an instruction to switch to that branch.
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You should instead write:
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------------
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$ git checkout -- hello.c
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------------
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. After working in a wrong branch, switching to the correct
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branch would be done using:
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+
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------------
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$ git checkout mytopic
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------------
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However, your "wrong" branch and correct "mytopic" branch may
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differ in files that you have locally modified, in which case,
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the above checkout would fail like this:
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------------
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$ git checkout mytopic
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fatal: Entry 'frotz' not uptodate. Cannot merge.
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------------
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You can give the `-m` flag to the command, which would try a
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three-way merge:
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------------
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$ git checkout -m mytopic
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Auto-merging frotz
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------------
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After this three-way merge, the local modifications are _not_
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registered in your index file, so `git diff` would show you what
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changes you made since the tip of the new branch.
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. When a merge conflict happens during switching branches with
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the `-m` option, you would see something like this:
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------------
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$ git checkout -m mytopic
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Auto-merging frotz
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merge: warning: conflicts during merge
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ERROR: Merge conflict in frotz
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fatal: merge program failed
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------------
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At this point, `git diff` shows the changes cleanly merged as in
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the previous example, as well as the changes in the conflicted
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files. Edit and resolve the conflict and mark it resolved with
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`git add` as usual:
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------------
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$ edit frotz
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$ git add frotz
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------------
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Author
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------
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Written by Linus Torvalds <torvalds@osdl.org>
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Documentation
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--------------
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Documentation by Junio C Hamano and the git-list <git@vger.kernel.org>.
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GIT
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---
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Part of the linkgit:git[1] suite
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