mirror of
https://github.com/git/git.git
synced 2024-11-18 15:04:49 +01:00
9a111c91b0
This lets a hook to interfere a rebase and help prevent certain branches from being rebased by mistake. A sample hook to show how to prevent a topic branch that has already been merged into publish branch. Signed-off-by: Junio C Hamano <junkio@cox.net>
150 lines
4.2 KiB
Bash
150 lines
4.2 KiB
Bash
#!/bin/sh
|
|
#
|
|
# Copyright (c) 2006 Junio C Hamano
|
|
#
|
|
|
|
publish=next
|
|
basebranch="$1"
|
|
if test "$#" = 2
|
|
then
|
|
topic="refs/heads/$2"
|
|
else
|
|
topic=`git symbolic-ref HEAD`
|
|
fi
|
|
|
|
case "$basebranch,$topic" in
|
|
master,refs/heads/??/*)
|
|
;;
|
|
*)
|
|
exit 0 ;# we do not interrupt others.
|
|
;;
|
|
esac
|
|
|
|
# Now we are dealing with a topic branch being rebased
|
|
# on top of master. Is it OK to rebase it?
|
|
|
|
# Is topic fully merged to master?
|
|
not_in_master=`git-rev-list --pretty=oneline ^master "$topic"`
|
|
if test -z "$not_in_master"
|
|
then
|
|
echo >&2 "$topic is fully merged to master; better remove it."
|
|
exit 1 ;# we could allow it, but there is no point.
|
|
fi
|
|
|
|
# Is topic ever merged to next? If so you should not be rebasing it.
|
|
only_next_1=`git-rev-list ^master "^$topic" ${publish} | sort`
|
|
only_next_2=`git-rev-list ^master ${publish} | sort`
|
|
if test "$only_next_1" = "$only_next_2"
|
|
then
|
|
not_in_topic=`git-rev-list "^$topic" master`
|
|
if test -z "$not_in_topic"
|
|
then
|
|
echo >&2 "$topic is already up-to-date with master"
|
|
exit 1 ;# we could allow it, but there is no point.
|
|
else
|
|
exit 0
|
|
fi
|
|
else
|
|
not_in_next=`git-rev-list --pretty=oneline ^${publish} "$topic"`
|
|
perl -e '
|
|
my $topic = $ARGV[0];
|
|
my $msg = "* $topic has commits already merged to public branch:\n";
|
|
my (%not_in_next) = map {
|
|
/^([0-9a-f]+) /;
|
|
($1 => 1);
|
|
} split(/\n/, $ARGV[1]);
|
|
for my $elem (map {
|
|
/^([0-9a-f]+) (.*)$/;
|
|
[$1 => $2];
|
|
} split(/\n/, $ARGV[2])) {
|
|
if (!exists $not_in_next{$elem->[0]}) {
|
|
if ($msg) {
|
|
print STDERR $msg;
|
|
undef $msg;
|
|
}
|
|
print STDERR " $elem->[1]\n";
|
|
}
|
|
}
|
|
' "$topic" "$not_in_next" "$not_in_master"
|
|
exit 1
|
|
fi
|
|
|
|
exit 0
|
|
|
|
################################################################
|
|
|
|
This sample hook safeguards topic branches that have been
|
|
published from being rewound.
|
|
|
|
The workflow assumed here is:
|
|
|
|
* Once a topic branch forks from "master", "master" is never
|
|
merged into it again (either directly or indirectly).
|
|
|
|
* Once a topic branch is fully cooked and merged into "master",
|
|
it is deleted. If you need to build on top of it to correct
|
|
earlier mistakes, a new topic branch is created by forking at
|
|
the tip of the "master". This is not strictly necessary, but
|
|
it makes it easier to keep your history simple.
|
|
|
|
* Whenever you need to test or publish your changes to topic
|
|
branches, merge them into "next" branch.
|
|
|
|
The script, being an example, hardcodes the publish branch name
|
|
to be "next", but it is trivial to make it configurable via
|
|
$GIT_DIR/config mechanism.
|
|
|
|
With this workflow, you would want to know:
|
|
|
|
(1) ... if a topic branch has ever been merged to "next". Young
|
|
topic branches can have stupid mistakes you would rather
|
|
clean up before publishing, and things that have not been
|
|
merged into other branches can be easily rebased without
|
|
affecting other people. But once it is published, you would
|
|
not want to rewind it.
|
|
|
|
(2) ... if a topic branch has been fully merged to "master".
|
|
Then you can delete it. More importantly, you should not
|
|
build on top of it -- other people may already want to
|
|
change things related to the topic as patches against your
|
|
"master", so if you need further changes, it is better to
|
|
fork the topic (perhaps with the same name) afresh from the
|
|
tip of "master".
|
|
|
|
Let's look at this example:
|
|
|
|
o---o---o---o---o---o---o---o---o---o "next"
|
|
/ / / /
|
|
/ a---a---b A / /
|
|
/ / / /
|
|
/ / c---c---c---c B /
|
|
/ / / \ /
|
|
/ / / b---b C \ /
|
|
/ / / / \ /
|
|
---o---o---o---o---o---o---o---o---o---o---o "master"
|
|
|
|
|
|
A, B and C are topic branches.
|
|
|
|
* A has one fix since it was merged up to "next".
|
|
|
|
* B has finished. It has been fully merged up to "master" and "next",
|
|
and is ready to be deleted.
|
|
|
|
* C has not merged to "next" at all.
|
|
|
|
We would want to allow C to be rebased, refuse A, and encourage
|
|
B to be deleted.
|
|
|
|
To compute (1):
|
|
|
|
git-rev-list ^master ^topic next
|
|
git-rev-list ^master next
|
|
|
|
if these match, topic has not merged in next at all.
|
|
|
|
To compute (2):
|
|
|
|
git-rev-list master..topic
|
|
|
|
if this is empty, it is fully merged to "master".
|