local end receive-pack runs, but to the user who is sitting at
the send-pack end, it is updating the remote. Confused?)
-Before each ref is updated, if $GIT_DIR/hooks/update file exists
-and executable, it is called with three parameters:
+There are other real-world examples of using update and
+post-update hooks found in the Documentation/howto directory.
- $GIT_DIR/hooks/update refname sha1-old sha1-new
+git-receive-pack honours the receive.denyNonFastForwards config
+option, which tells it if updates to a ref should be denied if they
+are not fast-forwards.
+
+OPTIONS
+-------
+<directory>::
+ The repository to sync into.
+
+pre-receive Hook
+----------------
+Before any ref is updated, if $GIT_DIR/hooks/pre-receive file exists
+and is executable, it will be invoked once with no parameters. The
+standard input of the hook will be one line per ref to be updated:
+
+ sha1-old SP sha1-new SP refname LF
+
+The refname value is relative to $GIT_DIR; e.g. for the master
+head this is "refs/heads/master". The two sha1 values before
+each refname are the object names for the refname before and after
+the update. Refs to be created will have sha1-old equal to 0{40},
+while refs to be deleted will have sha1-new equal to 0{40}, otherwise
+sha1-old and sha1-new should be valid objects in the repository.
+
+This hook is called before any refname is updated and before any
+fast-forward checks are performed.
+
+If the pre-receive hook exits with a non-zero exit status no updates
+will be performed, and the update, post-receive and post-update
+hooks will not be invoked either. This can be useful to quickly
+bail out if the update is not to be supported.
-The refname parameter is relative to $GIT_DIR; e.g. for the
-master head this is "refs/heads/master". Two sha1 are the
-object names for the refname before and after the update. Note
-that the hook is called before the refname is updated, so either
-sha1-old is 0{40} (meaning there is no such ref yet), or it
-should match what is recorded in refname.
+update Hook
+-----------
+Before each ref is updated, if $GIT_DIR/hooks/update file exists
+and is executable, it is invoked once per ref, with three parameters:
-The hook should exit with non-zero status if it wants to
-disallow updating the named ref. Otherwise it should exit with
-zero.
+ $GIT_DIR/hooks/update refname sha1-old sha1-new
-Using this hook, it is easy to generate mails on updates to
-the local repository. This example script sends a mail with
-the commits pushed to the repository:
+The refname parameter is relative to $GIT_DIR; e.g. for the master
+head this is "refs/heads/master". The two sha1 arguments are
+the object names for the refname before and after the update.
+Note that the hook is called before the refname is updated,
+so either sha1-old is 0{40} (meaning there is no such ref yet),
+or it should match what is recorded in refname.
+
+The hook should exit with non-zero status if it wants to disallow
+updating the named ref. Otherwise it should exit with zero.
+
+Successful execution (a zero exit status) of this hook does not
+ensure the ref will actully be updated, it is only a prerequisite.
+As such it is not a good idea to send notices (e.g. email) from
+this hook. Consider using the post-receive hook instead.
+
+post-receive Hook
+-----------------
+After all refs were updated (or attempted to be updated), if any
+ref update was successful, and if $GIT_DIR/hooks/post-receive
+file exists and is executable, it will be invoke once with no
+parameters. The standard input of the hook will be one line
+for each successfully updated ref:
+
+ sha1-old SP sha1-new SP refname LF
+
+The refname value is relative to $GIT_DIR; e.g. for the master
+head this is "refs/heads/master". The two sha1 values before
+each refname are the object names for the refname before and after
+the update. Refs that were created will have sha1-old equal to
+0{40}, while refs that were deleted will have sha1-new equal to
+0{40}, otherwise sha1-old and sha1-new should be valid objects in
+the repository.
+
+Using this hook, it is easy to generate mails describing the updates
+to the repository. This example script sends one mail message per
+ref listing the commits pushed to the repository:
#!/bin/sh
# mail out commit update information.
- if expr "$2" : '0*$' >/dev/null
- then
- echo "Created a new ref, with the following commits:"
- git-rev-list --pretty "$2"
- else
- echo "New commits:"
- git-rev-list --pretty "$3" "^$2"
- fi |
- mail -s "Changes to ref $1" commit-list@mydomain
+ while read oval nval ref
+ do
+ if expr "$oval" : '0*$' >/dev/null
+ then
+ echo "Created a new ref, with the following commits:"
+ git-rev-list --pretty "$nval"
+ else
+ echo "New commits:"
+ git-rev-list --pretty "$nval" "^$oval"
+ fi |
+ mail -s "Changes to ref $ref" commit-list@mydomain
+ done
exit 0
-Another hook $GIT_DIR/hooks/post-update, if exists and
-executable, is called with the list of refs that have been
-updated. This can be used to implement repository wide cleanup
-task if needed. The exit code from this hook invocation is
-ignored; the only thing left for git-receive-pack to do at that
-point is to exit itself anyway. This hook can be used, for
-example, to run "git-update-server-info" if the repository is
-packed and is served via a dumb transport.
+The exit code from this hook invocation is ignored, however a
+non-zero exit code will generate an error message.
- #!/bin/sh
- exec git-update-server-info
+Note that it is possible for refname to not have sha1-new when this
+hook runs. This can easily occur if another user modifies the ref
+after it was updated by receive-pack, but before the hook was able
+to evaluate it. It is recommended that hooks rely on sha1-new
+rather than the current value of refname.
-There are other real-world examples of using update and
-post-update hooks found in the Documentation/howto directory.
+post-update Hook
+----------------
+After all other processing, if at least one ref was updated, and
+if $GIT_DIR/hooks/post-update file exists and is executable, then
+post-update will called with the list of refs that have been updated.
+This can be used to implement any repository wide cleanup tasks.
-git-receive-pack honours the receive.denyNonFastforwards flag, which
-tells it if updates to a ref should be denied if they are not fast-forwards.
+The exit code from this hook invocation is ignored; the only thing
+left for git-receive-pack to do at that point is to exit itself
+anyway.
-OPTIONS
--------
-<directory>::
- The repository to sync into.
+This hook can be used, for example, to run "git-update-server-info"
+if the repository is packed and is served via a dumb transport.
+
+ #!/bin/sh
+ exec git-update-server-info
SEE ALSO