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| '''Named branches''' allow assigning persistent symbolic names to [[Branch|branches]] of development inside a single [[Repository|repository]]. == Find What Branch You're On == Calling {{{hg branch}}} without a name shows the current branch name of the [[WorkingDirectory|working directory]]. Calling {{{hg branch}}} after a {{{hg init}}} outputs "default", the (reserved) name of the default branch: {{{ $ hg init $ hg branch default }}} == Create a Branch == To begin a new branch, set the branch name of the working directory and then [[Commit|commit]] it: {{{ $ hg branch newfeature marked working directory as branch newfeature $ hg branch newfeature $ hg ci -m "start feature branch" $ hg parents changeset: 3899:c08bfc770d37 branch: newfeature tag: tip user: Matt Mackall <mpm@selenic.com> date: Tue Dec 19 14:20:11 2006 -0600 summary: start feature branch }}} From this point on, all committed [[ChangeSet|changesets]] will be associated with the supplied branch name. Unless overridden with the {{{hg branch}}} command, the working directory inherits the branch name associated with a changeset. This way, a sequence of changesets will typically all have the same branch name. When Mercurial lists a changeset, it will only show the branch name associated with the changeset if the branch name differs from the reserved branch name "default". === Create a Branch From an Older Revision === This can be done by updating your working copy to the revision in question and then creating the new branch. {{{ $ hg update -r 500 hg 613 files updated, 0 files merged, 16 files removed, 0 files unresolved $ hg branch newbranch $ hg commit -m 'made a new branch from revision 500' }}} == Switch Among Branches == Switch among branches using the {{{hg update}}} command: {{{ $ hg update -C main $ hg update -C newfeature }}} The {{{hg update}}} command normally allows updating along a single branch in the history. Use the {{{-C}}} option to switch to another. '''Note:''' the {{{-C}}} option also discards local changes, so be careful before using this command. == Merge Branches == When [[Merge|merging]] with another branch, the local branch name takes precedence: {{{ $ hg branch newfeature $ hg in remote searching for changes changeset: 3900:3be94ff00829 branch: main tag: tip parent: 3898:93e5f07baf75 user: Matt Mackall <mpm@selenic.com> date: Tue Dec 19 14:26:52 2006 -0600 summary: bug fix $ hg pull remote pulling from remote searching for changes adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files (+1 heads) (run 'hg heads' to see heads, 'hg merge' to merge) $ hg merge 1 files updated, 0 files merged, 0 files removed, 0 files unresolved (branch merge, don't forget to commit) $ hg branch newfeature }}} Branch names can be used anywhere that tag names can, including log, diff, [[Push|push]], and [[Pull|pull]]. When a branch has multiple [[Head|heads]], the [[Tip|tipmost]] revision of the branch will be found. Here are some examples: {{{ $ hg branches main 3900:3be94ff00829 newfeature 3899:c08bfc770d37 $ hg log -r main changeset: 3900:3be94ff00829 branch: main tag: tip parent: 3898:93e5f07baf75 user: Matt Mackall <mpm@selenic.com> date: Tue Dec 19 14:26:52 2006 -0600 summary: bug fix $ hg in -r main ../bd2 searching for changes no changes found }}} == Delete Branches == PruningDeadBranches == Undoing a Bad Merge == Mercurial does not yet offer a foolproof way to back out an erroneous merge. The latest information I've been able to find on this matter is at http://stackoverflow.com/questions/265944/backing-out-a-backwards-merge-on-mercurial and is currently marked unresolved. == Links == * [[http://hgbook.red-bean.com/read/managing-releases-and-branchy-development.html|Managing releases and branchy development]] See also: [[MultipleHeads]], [[Branch]], [[Bookmarks]] ---- CategoryHowTo |
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