441 lines
14 KiB
Plaintext
441 lines
14 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] [-m] [<branch>]
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'git checkout' [-q] [-f] [-m] [--detach] [<commit>]
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'git checkout' [-q] [-f] [-m] [[-b|-B|--orphan] <new_branch>] [<start_point>]
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'git checkout' [-f|--ours|--theirs|-m|--conflict=<style>] [<tree-ish>] [--] <paths>...
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'git checkout' [-p|--patch] [<tree-ish>] [--] [<paths>...]
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DESCRIPTION
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-----------
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Updates files in the working tree to match the version in the index
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or the specified tree. If no paths are given, 'git checkout' will
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also update `HEAD` to set the specified branch as the current
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branch.
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'git checkout' [<branch>]::
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'git checkout' -b|-B <new_branch> [<start point>]::
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'git checkout' [--detach] [<commit>]::
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This form switches branches by updating the index, working
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tree, and HEAD to reflect the specified branch or commit.
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+
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If `-b` is given, a new branch is created as if linkgit:git-branch[1]
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were called and then checked out; in this case you can
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use the `--track` or `--no-track` options, which will be passed to
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'git branch'. As a convenience, `--track` without `-b` implies branch
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creation; see the description of `--track` below.
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+
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If `-B` is given, <new_branch> is created if it doesn't exist; otherwise, it
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is reset. This is the transactional equivalent of
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+
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------------
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$ git branch -f <branch> [<start point>]
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$ git checkout <branch>
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------------
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+
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that is to say, the branch is not reset/created unless "git checkout" is
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successful.
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'git checkout' [-p|--patch] [<tree-ish>] [--] <pathspec>...::
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When <paths> or `--patch` are given, 'git checkout' does *not*
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switch branches. It updates the named paths in the working tree
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from the index file or from a named <tree-ish> (most often a
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commit). In this case, the `-b` and `--track` options are
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meaningless and giving either of them results in an error. The
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<tree-ish> argument can be used to specify a specific tree-ish
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(i.e. commit, tag or tree) to update the index for the given
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paths before updating the working tree.
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+
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The index may contain unmerged entries because of a previous failed merge.
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By 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 re-create the original conflicted merge result.
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OPTIONS
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-------
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-q::
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--quiet::
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Quiet, suppress feedback messages.
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-f::
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--force::
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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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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 <new_branch>::
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Create a new branch named <new_branch> and start it at
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<start_point>; see linkgit:git-branch[1] for details.
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-B <new_branch>::
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Creates the branch <new_branch> and start it at <start_point>;
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if it already exists, then reset it to <start_point>. This is
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equivalent to running "git branch" with "-f"; see
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linkgit:git-branch[1] for details.
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-t::
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--track::
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When creating a new branch, set up "upstream" configuration. See
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"--track" in linkgit:git-branch[1] for details.
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If no '-b' option is given, the name of the new branch will be
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derived from the remote-tracking branch. If "remotes/" or "refs/remotes/"
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is prefixed it is stripped away, and then the part up to the
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next slash (which would be the nickname of the remote) is removed.
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This would tell us to use "hack" as the local branch when branching
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off of "origin/hack" (or "remotes/origin/hack", or even
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"refs/remotes/origin/hack"). If the given name has no slash, or the above
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guessing results in an empty name, the guessing is aborted. You can
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explicitly give a name with '-b' in such a case.
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--no-track::
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Do not set up "upstream" configuration, even if the
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branch.autosetupmerge configuration variable is true.
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-l::
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Create the new branch's reflog; see linkgit:git-branch[1] for
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details.
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--detach::
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Rather than checking out a branch to work on it, check out a
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commit for inspection and discardable experiments.
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This is the default behavior of "git checkout <commit>" when
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<commit> is not a branch name. See the "DETACHED HEAD" section
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below for details.
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--orphan <new_branch>::
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Create a new 'orphan' branch, named <new_branch>, started from
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<start_point> and switch to it. The first commit made on this
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new branch will have no parents and it will be the root of a new
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history totally disconnected from all the other branches and
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commits.
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+
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The index and the working tree are adjusted as if you had previously run
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"git checkout <start_point>". This allows you to start a new history
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that records a set of paths similar to <start_point> by easily running
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"git commit -a" to make the root commit.
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+
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This can be useful when you want to publish the tree from a commit
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without exposing its full history. You might want to do this to publish
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an open source branch of a project whose current tree is "clean", but
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whose full history contains proprietary or otherwise encumbered bits of
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code.
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If you want to start a disconnected history that records a set of paths
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that is totally different from the one of <start_point>, then you should
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clear the index and the working tree right after creating the orphan
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branch by running "git rm -rf ." from the top level of the working tree.
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Afterwards you will be ready to prepare your new files, repopulating the
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working tree, by copying them from elsewhere, extracting a tarball, etc.
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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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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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-p::
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--patch::
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Interactively select hunks in the difference between the
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<tree-ish> (or the index, if unspecified) and the working
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tree. The chosen hunks are then applied in reverse to the
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working tree (and if a <tree-ish> was specified, the index).
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This means that you can use `git checkout -p` to selectively discard
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edits from your current working tree. See the ``Interactive Mode''
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section of linkgit:git-add[1] to learn how to operate the `--patch` mode.
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<branch>::
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Branch to checkout; if it refers to a branch (i.e., a name that,
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when prepended with "refs/heads/", is a valid ref), then that
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branch is checked out. Otherwise, if it refers to a valid
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commit, your HEAD becomes "detached" and you are no longer on
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any branch (see below for details).
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As a special case, the `"@{-N}"` syntax for the N-th last branch
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checks out the branch (instead of detaching). You may also specify
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`-` which is synonymous with `"@{-1}"`.
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As a further special case, you may use `"A...B"` as a shortcut for the
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merge base of `A` and `B` if there is exactly one merge base. You can
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leave out at most one of `A` and `B`, in which case it defaults to `HEAD`.
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<new_branch>::
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Name for the new branch.
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<start_point>::
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The name of a commit at which to start the new branch; see
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linkgit:git-branch[1] for details. Defaults to HEAD.
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<tree-ish>::
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Tree to checkout from (when paths are given). If not specified,
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the index will be used.
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DETACHED HEAD
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-------------
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HEAD normally refers to a named branch (e.g. 'master'). Meanwhile, each
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branch refers to a specific commit. Let's look at a repo with three
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commits, one of them tagged, and with branch 'master' checked out:
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------------
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HEAD (refers to branch 'master')
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v
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a---b---c branch 'master' (refers to commit 'c')
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^
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tag 'v2.0' (refers to commit 'b')
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------------
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When a commit is created in this state, the branch is updated to refer to
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the new commit. Specifically, 'git commit' creates a new commit 'd', whose
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parent is commit 'c', and then updates branch 'master' to refer to new
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commit 'd'. HEAD still refers to branch 'master' and so indirectly now refers
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to commit 'd':
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------------
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$ edit; git add; git commit
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HEAD (refers to branch 'master')
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v
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a---b---c---d branch 'master' (refers to commit 'd')
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^
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tag 'v2.0' (refers to commit 'b')
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------------
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It is sometimes useful to be able to checkout a commit that is not at
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the tip of any named branch, or even to create a new commit that is not
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referenced by a named branch. Let's look at what happens when we
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checkout commit 'b' (here we show two ways this may be done):
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------------
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$ git checkout v2.0 # or
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$ git checkout master^^
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HEAD (refers to commit 'b')
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v
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a---b---c---d branch 'master' (refers to commit 'd')
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^
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tag 'v2.0' (refers to commit 'b')
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------------
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Notice that regardless of which checkout command we use, HEAD now refers
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directly to commit 'b'. This is known as being in detached HEAD state.
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It means simply that HEAD refers to a specific commit, as opposed to
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referring to a named branch. Let's see what happens when we create a commit:
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------------
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$ edit; git add; git commit
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HEAD (refers to commit 'e')
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v
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e
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/
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a---b---c---d branch 'master' (refers to commit 'd')
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^
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tag 'v2.0' (refers to commit 'b')
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------------
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There is now a new commit 'e', but it is referenced only by HEAD. We can
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of course add yet another commit in this state:
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------------
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$ edit; git add; git commit
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HEAD (refers to commit 'f')
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v
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e---f
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/
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a---b---c---d branch 'master' (refers to commit 'd')
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^
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tag 'v2.0' (refers to commit 'b')
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------------
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In fact, we can perform all the normal git operations. But, let's look
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at what happens when we then checkout master:
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------------
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$ git checkout master
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HEAD (refers to branch 'master')
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e---f |
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/ v
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a---b---c---d branch 'master' (refers to commit 'd')
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^
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tag 'v2.0' (refers to commit 'b')
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------------
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It is important to realize that at this point nothing refers to commit
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'f'. Eventually commit 'f' (and by extension commit 'e') will be deleted
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by the routine git garbage collection process, unless we create a reference
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before that happens. If we have not yet moved away from commit 'f',
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any of these will create a reference to it:
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------------
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$ git checkout -b foo <1>
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$ git branch foo <2>
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$ git tag foo <3>
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------------
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<1> creates a new branch 'foo', which refers to commit 'f', and then
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updates HEAD to refer to branch 'foo'. In other words, we'll no longer
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be in detached HEAD state after this command.
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<2> similarly creates a new branch 'foo', which refers to commit 'f',
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but leaves HEAD detached.
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<3> creates a new tag 'foo', which refers to commit 'f',
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leaving HEAD detached.
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If we have moved away from commit 'f', then we must first recover its object
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name (typically by using git reflog), and then we can create a reference to
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it. For example, to see the last two commits to which HEAD referred, we
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can use either of these commands:
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------------
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$ git reflog -2 HEAD # or
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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 a file out of another commit
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<3> restore hello.c from the index
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If you want to check out _all_ C source files out of the index,
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you can say
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------------
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$ git checkout -- '*.c'
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------------
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Note the quotes around `*.c`. The file `hello.c` will also be
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checked out, even though it is no longer in the working tree,
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because the file globbing is used to match entries in the index
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(not in the working tree by the shell).
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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 the wrong branch, switching to the correct
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branch would be done using:
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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 modified locally, 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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error: You have local changes to 'frotz'; not switching branches.
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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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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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GIT
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---
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Part of the linkgit:git[1] suite
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