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-rw-r--r--Documentation/git-push.txt88
1 files changed, 74 insertions, 14 deletions
diff --git a/Documentation/git-push.txt b/Documentation/git-push.txt
index f7dfe48d28..2b7f4f939f 100644
--- a/Documentation/git-push.txt
+++ b/Documentation/git-push.txt
@@ -11,6 +11,7 @@ SYNOPSIS
[verse]
'git push' [--all | --mirror | --tags] [--follow-tags] [-n | --dry-run] [--receive-pack=<git-receive-pack>]
[--repo=<repository>] [-f | --force] [--prune] [-v | --verbose] [-u | --set-upstream]
+ [--force-with-lease[=<refname>[:<expect>]]]
[--no-verify] [<repository> [<refspec>...]]
DESCRIPTION
@@ -55,8 +56,13 @@ it can be any arbitrary "SHA-1 expression", such as `master~4` or
+
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.
+be named.
+If `git push [<repository>]` without any `<refspec>` argument is set to
+update some ref at the destination with `<src>` with
+`remote.<repository>.push` configuration variable, `:<dst>` part can
+be omitted---such a push will update a ref that `<src>` normally updates
+without any `<refspec>` on the command line. Otherwise, missing
+`:<dst>` means to update the same ref as the `<src>`.
+
The object referenced by <src> is used to update the <dst> reference
on the remote side. By default this is only allowed if <dst> is not
@@ -120,7 +126,7 @@ already exists on the remote side.
--follow-tags::
Push all the refs that would be pushed without this option,
and also push annotated tags in `refs/tags` that are missing
- from the remote but are pointing at committish that are
+ from the remote but are pointing at commit-ish that are
reachable from the refs being pushed.
--receive-pack=<git-receive-pack>::
@@ -130,21 +136,75 @@ already exists on the remote side.
repository over ssh, and you do not have the program in
a directory on the default $PATH.
+--[no-]force-with-lease::
+--force-with-lease=<refname>::
+--force-with-lease=<refname>:<expect>::
+ Usually, "git push" refuses to update a remote ref that is
+ not an ancestor of the local ref used to overwrite it.
++
+This option bypasses the check, but instead requires that the
+current value of the ref to be the expected value. "git push"
+fails otherwise.
++
+Imagine that you have to rebase what you have already published.
+You will have to bypass the "must fast-forward" rule in order to
+replace the history you originally published with the rebased history.
+If somebody else built on top of your original history while you are
+rebasing, the tip of the branch at the remote may advance with her
+commit, and blindly pushing with `--force` will lose her work.
++
+This option allows you to say that you expect the history you are
+updating is what you rebased and want to replace. If the remote ref
+still points at the commit you specified, you can be sure that no
+other people did anything to the ref (it is like taking a "lease" on
+the ref without explicitly locking it, and you update the ref while
+making sure that your earlier "lease" is still valid).
++
+`--force-with-lease` alone, without specifying the details, will protect
+all remote refs that are going to be updated by requiring their
+current value to be the same as the remote-tracking branch we have
+for them, unless specified with a `--force-with-lease=<refname>:<expect>`
+option that explicitly states what the expected value is.
++
+`--force-with-lease=<refname>`, without specifying the expected value, will
+protect the named ref (alone), if it is going to be updated, by
+requiring its current value to be the same as the remote-tracking
+branch we have for it.
++
+`--force-with-lease=<refname>:<expect>` will protect the named ref (alone),
+if it is going to be updated, by requiring its current value to be
+the same as the specified value <expect> (which is allowed to be
+different from the remote-tracking branch we have for the refname,
+or we do not even have to have such a remote-tracking branch when
+this form is used).
++
+Note that all forms other than `--force-with-lease=<refname>:<expect>`
+that specifies the expected current value of the ref explicitly are
+still experimental and their semantics may change as we gain experience
+with this feature.
++
+"--no-force-with-lease" will cancel all the previous --force-with-lease on the
+command line.
+
-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.
- Note that `--force` applies to all the refs that are pushed,
- hence using it with `push.default` set to `matching` or with
- multiple push destinations configured with `remote.*.push`
- may overwrite refs other than the current branch (including
- local refs that are strictly behind their remote counterpart).
- To force a push to only one branch, use a `+` in front of the
- refspec to push (e.g `git push origin +master` to force a push
- to the `master` branch). See the `<refspec>...` section above
- for details.
+ Also, when `--force-with-lease` option is used, the command refuses
+ to update a remote ref whose current value does not match
+ what is expected.
++
+This flag disables these checks, and can cause the remote repository
+to lose commits; use it with care.
++
+Note that `--force` applies to all the refs that are pushed, hence
+using it with `push.default` set to `matching` or with multiple push
+destinations configured with `remote.*.push` may overwrite refs
+other than the current branch (including local refs that are
+strictly behind their remote counterpart). To force a push to only
+one branch, use a `+` in front of the refspec to push (e.g `git push
+origin +master` to force a push to the `master` branch). See the
+`<refspec>...` section above for details.
--repo=<repository>::
This option is only relevant if no <repository> argument is