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Diffstat (limited to 'Documentation/git-push.txt')
| -rw-r--r-- | Documentation/git-push.txt | 296 |
1 files changed, 239 insertions, 57 deletions
diff --git a/Documentation/git-push.txt b/Documentation/git-push.txt index f06d94e318..52c0538df5 100644 --- a/Documentation/git-push.txt +++ b/Documentation/git-push.txt @@ -9,8 +9,9 @@ git-push - Update remote refs along with associated objects SYNOPSIS -------- [verse] -'git-push' [--all] [--dry-run] [--tags] [--receive-pack=<git-receive-pack>] - [--repo=all] [-f | --force] [-v | --verbose] [<repository> <refspec>...] +'git push' [--all | --mirror | --tags] [-n | --dry-run] [--receive-pack=<git-receive-pack>] + [--repo=<repository>] [-f | --force] [-v | --verbose] + [<repository> <refspec>...] DESCRIPTION ----------- @@ -23,50 +24,57 @@ every time you push into it, by setting up 'hooks' there. See documentation for linkgit:git-receive-pack[1]. -OPTIONS -------- +OPTIONS[[OPTIONS]] +------------------ <repository>:: The "remote" repository that is destination of a push - operation. See the section <<URLS,GIT URLS>> below. - -<refspec>:: - The canonical format of a <refspec> parameter is - `+?<src>:<dst>`; that is, an optional plus `+`, followed - by the source ref, followed by a colon `:`, followed by - the destination ref. + operation. This parameter can be either a URL + (see the section <<URLS,GIT URLS>> below) or the name + of a remote (see the section <<REMOTES,REMOTES>> below). + +<refspec>...:: + The format of a <refspec> parameter is an optional plus + `{plus}`, followed by the source ref <src>, followed + by a colon `:`, followed by the destination ref <dst>. + It is used to specify with what <src> object the <dst> ref + in the remote repository is to be updated. + -The <src> side represents the source branch (or arbitrary -"SHA1 expression", such as `master~4` (four parents before the -tip of `master` branch); see linkgit:git-rev-parse[1]) that you -want to push. The <dst> side represents the destination location. +The <src> is often the name of the branch you would want to push, but +it can be any arbitrary "SHA-1 expression", such as `master~4` or +`HEAD` (see linkgit:git-rev-parse[1]). + -The local ref that matches <src> is used -to fast forward the remote ref that matches <dst> (or, if no <dst> was -specified, the same ref that <src> referred to locally). If -the optional leading plus `+` is used, the remote ref is updated -even if it does not result in a fast forward update. +The <dst> tells which ref on the remote side is updated with this +push. Arbitrary expressions cannot be used here, an actual ref must +be named. If `:`<dst> is omitted, the same ref as <src> will be +updated. + -Note: If no explicit refspec is found, (that is neither -on the command line nor in any Push line of the -corresponding remotes file---see below), then "matching" heads are -pushed: for every head that exists on the local side, the remote side is -updated if a head of the same name already exists on the remote side. +The object referenced by <src> is used to update the <dst> reference +on the remote side, but by default this is only allowed if the +update can fast-forward <dst>. By having the optional leading `{plus}`, +you can tell git to update the <dst> ref even when the update is not a +fast-forward. This does *not* attempt to merge <src> into <dst>. See +EXAMPLES below for details. + `tag <tag>` means the same as `refs/tags/<tag>:refs/tags/<tag>`. + -A parameter <ref> without a colon pushes the <ref> from the source -repository to the destination repository under the same name. -+ Pushing an empty <src> allows you to delete the <dst> ref from the remote repository. - -\--all:: ++ +The special refspec `:` (or `{plus}:` to allow non-fast-forward updates) +directs git to push "matching" branches: for every branch that exists on +the local side, the remote side is updated if a branch of the same name +already exists on the remote side. This is the default operation mode +if no explicit refspec is found (that is neither on the command line +nor in any Push line of the corresponding remotes file---see below). + +--all:: Instead of naming each ref to push, specifies that all refs under `$GIT_DIR/refs/heads/` be pushed. -\--mirror:: +--mirror:: Instead of naming each ref to push, specifies that all - refs under `$GIT_DIR/refs/heads/` and `$GIT_DIR/refs/tags/` + refs under `$GIT_DIR/refs/` (which includes but is not + limited to `refs/heads/`, `refs/remotes/`, and `refs/tags/`) be mirrored to the remote repository. Newly created local refs will be pushed to the remote end, locally updated refs will be force updated on the remote end, and deleted refs @@ -74,41 +82,67 @@ the remote repository. if the configuration option `remote.<remote>.mirror` is set. -\--dry-run:: +-n:: +--dry-run:: Do everything except actually send the updates. -\--tags:: +--porcelain:: + Produce machine-readable output. The output status line for each ref + will be tab-separated and sent to stdout instead of stderr. The full + symbolic names of the refs will be given. + +--tags:: All refs under `$GIT_DIR/refs/tags` are pushed, in addition to refspecs explicitly listed on the command line. -\--receive-pack=<git-receive-pack>:: +--receive-pack=<git-receive-pack>:: +--exec=<git-receive-pack>:: Path to the 'git-receive-pack' program on the remote end. Sometimes useful when pushing to a remote repository over ssh, and you do not have the program in a directory on the default $PATH. -\--exec=<git-receive-pack>:: - Same as \--receive-pack=<git-receive-pack>. - --f, \--force:: +-f:: +--force:: Usually, the command refuses to update a remote ref that is not an ancestor of the local ref used to overwrite it. This flag disables the check. This can cause the remote repository to lose commits; use it with care. -\--repo=<repo>:: - When no repository is specified the command defaults to - "origin"; this overrides it. +--repo=<repository>:: + This option is only relevant if no <repository> argument is + passed in the invocation. In this case, 'git-push' derives the + remote name from the current branch: If it tracks a remote + branch, then that remote repository is pushed to. Otherwise, + the name "origin" is used. For this latter case, this option + can be used to override the name "origin". In other words, + the difference between these two commands ++ +-------------------------- +git push public #1 +git push --repo=public #2 +-------------------------- ++ +is that #1 always pushes to "public" whereas #2 pushes to "public" +only if the current branch does not track a remote branch. This is +useful if you write an alias or script around 'git-push'. -\--thin, \--no-thin:: - These options are passed to `git-send-pack`. Thin +--thin:: +--no-thin:: + These options are passed to 'git-send-pack'. Thin transfer spends extra cycles to minimize the number of objects to be sent and meant to be used on slower connection. --v, \--verbose:: +-v:: +--verbose:: Run verbosely. +-q:: +--quiet:: + Suppress all output, including the listing of updated refs, + unless an error occurs. + include::urls-remotes.txt[] OUTPUT @@ -125,6 +159,12 @@ representing the status of a single ref. Each line is of the form: <flag> <summary> <from> -> <to> (<reason>) ------------------------------- +If --porcelain is used, then each line of the output is of the form: + +------------------------------- + <flag> \t <from>:<to> \t <summary> (<reason>) +------------------------------- + flag:: A single character indicating the status of the ref. This is blank for a successfully pushed ref, `!` for a ref that was @@ -136,10 +176,10 @@ summary:: For a successfully pushed ref, the summary shows the old and new values of the ref in a form suitable for using as an argument to `git log` (this is `<old>..<new>` in most cases, and - `<old>...<new>` for forced non-fast forward updates). For a + `<old>...<new>` for forced non-fast-forward updates). For a failed update, more details are given for the failure. The string `rejected` indicates that git did not try to send the - ref at all (typically because it is not a fast forward). The + ref at all (typically because it is not a fast-forward). The string `remote rejected` indicates that the remote end refused the update; this rejection is typically caused by a hook on the remote side. The string `remote failure` indicates that the @@ -161,9 +201,117 @@ reason:: refs, no explanation is needed. For a failed ref, the reason for failure is described. +Note about fast-forwards +------------------------ + +When an update changes a branch (or more in general, a ref) that used to +point at commit A to point at another commit B, it is called a +fast-forward update if and only if B is a descendant of A. + +In a fast-forward update from A to B, the set of commits that the original +commit A built on top of is a subset of the commits the new commit B +builds on top of. Hence, it does not lose any history. + +In contrast, a non-fast-forward update will lose history. For example, +suppose you and somebody else started at the same commit X, and you built +a history leading to commit B while the other person built a history +leading to commit A. The history looks like this: + +---------------- + + B + / + ---X---A + +---------------- + +Further suppose that the other person already pushed changes leading to A +back to the original repository you two obtained the original commit X. + +The push done by the other person updated the branch that used to point at +commit X to point at commit A. It is a fast-forward. + +But if you try to push, you will attempt to update the branch (that +now points at A) with commit B. This does _not_ fast-forward. If you did +so, the changes introduced by commit A will be lost, because everybody +will now start building on top of B. + +The command by default does not allow an update that is not a fast-forward +to prevent such loss of history. + +If you do not want to lose your work (history from X to B) nor the work by +the other person (history from X to A), you would need to first fetch the +history from the repository, create a history that contains changes done +by both parties, and push the result back. + +You can perform "git pull", resolve potential conflicts, and "git push" +the result. A "git pull" will create a merge commit C between commits A +and B. + +---------------- + + B---C + / / + ---X---A + +---------------- + +Updating A with the resulting merge commit will fast-forward and your +push will be accepted. + +Alternatively, you can rebase your change between X and B on top of A, +with "git pull --rebase", and push the result back. The rebase will +create a new commit D that builds the change between X and B on top of +A. + +---------------- + + B D + / / + ---X---A + +---------------- + +Again, updating A with this commit will fast-forward and your push will be +accepted. + +There is another common situation where you may encounter non-fast-forward +rejection when you try to push, and it is possible even when you are +pushing into a repository nobody else pushes into. After you push commit +A yourself (in the first picture in this section), replace it with "git +commit --amend" to produce commit B, and you try to push it out, because +forgot that you have pushed A out already. In such a case, and only if +you are certain that nobody in the meantime fetched your earlier commit A +(and started building on top of it), you can run "git push --force" to +overwrite it. In other words, "git push --force" is a method reserved for +a case where you do mean to lose history. + + Examples -------- +git push:: + Works like `git push <remote>`, where <remote> is the + current branch's remote (or `origin`, if no remote is + configured for the current branch). + +git push origin:: + Without additional configuration, works like + `git push origin :`. ++ +The default behavior of this command when no <refspec> is given can be +configured by setting the `push` option of the remote. ++ +For example, to default to pushing only the current branch to `origin` +use `git config remote.origin.push HEAD`. Any valid <refspec> (like +the ones in the examples below) can be configured as the default for +`git push origin`. + +git push origin ::: + Push "matching" branches to `origin`. See + <refspec> in the <<OPTIONS,OPTIONS>> section above for a + description of "matching" branches. + git push origin master:: Find a ref that matches `master` in the source repository (most likely, it would find `refs/heads/master`), and update @@ -171,15 +319,20 @@ git push origin master:: with it. If `master` did not exist remotely, it would be created. -git push origin :experimental:: - Find a ref that matches `experimental` in the `origin` repository - (e.g. `refs/heads/experimental`), and delete it. +git push origin HEAD:: + A handy way to push the current branch to the same name on the + remote. -git push origin master:satellite/master:: - Find a ref that matches `master` in the source repository - (most likely, it would find `refs/heads/master`), and update - the ref that matches `satellite/master` (most likely, it would - be `refs/remotes/satellite/master`) in `origin` repository with it. +git push origin master:satellite/master dev:satellite/dev:: + Use the source ref that matches `master` (e.g. `refs/heads/master`) + to update the ref that matches `satellite/master` (most probably + `refs/remotes/satellite/master`) in the `origin` repository, then + do the same for `dev` and `satellite/dev`. + +git push origin HEAD:master:: + Push the current branch to the remote ref matching `master` in the + `origin` repository. This form is convenient to push the current + branch without thinking about its local name. git push origin master:refs/heads/experimental:: Create the branch `experimental` in the `origin` repository @@ -188,9 +341,38 @@ git push origin master:refs/heads/experimental:: the local name and the remote name are different; otherwise, the ref name on its own will work. +git push origin :experimental:: + Find a ref that matches `experimental` in the `origin` repository + (e.g. `refs/heads/experimental`), and delete it. + +git push origin {plus}dev:master:: + Update the origin repository's master branch with the dev branch, + allowing non-fast-forward updates. *This can leave unreferenced + commits dangling in the origin repository.* Consider the + following situation, where a fast-forward is not possible: ++ +---- + o---o---o---A---B origin/master + \ + X---Y---Z dev +---- ++ +The above command would change the origin repository to ++ +---- + A---B (unnamed branch) + / + o---o---o---X---Y---Z master +---- ++ +Commits A and B would no longer belong to a branch with a symbolic name, +and so would be unreachable. As such, these commits would be removed by +a `git gc` command on the origin repository. + + Author ------ -Written by Junio C Hamano <junkio@cox.net>, later rewritten in C +Written by Junio C Hamano <gitster@pobox.com>, later rewritten in C by Linus Torvalds <torvalds@osdl.org> Documentation @@ -199,4 +381,4 @@ Documentation by Junio C Hamano and the git-list <git@vger.kernel.org>. GIT --- -Part of the linkgit:git[7] suite +Part of the linkgit:git[1] suite |