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Diffstat (limited to 'pkgthing/git/hooks/pre-rebase.sample')
| -rwxr-xr-x | pkgthing/git/hooks/pre-rebase.sample | 169 |
1 files changed, 0 insertions, 169 deletions
diff --git a/pkgthing/git/hooks/pre-rebase.sample b/pkgthing/git/hooks/pre-rebase.sample deleted file mode 100755 index be1b06e..0000000 --- a/pkgthing/git/hooks/pre-rebase.sample +++ /dev/null @@ -1,169 +0,0 @@ -#!/bin/sh -# -# Copyright (c) 2006, 2008 Junio C Hamano -# -# The "pre-rebase" hook is run just before "git-rebase" starts doing -# its job, and can prevent the command from running by exiting with -# non-zero status. -# -# The hook is called with the following parameters: -# -# $1 -- the upstream the series was forked from. -# $2 -- the branch being rebased (or empty when rebasing the current branch). -# -# This sample shows how to prevent topic branches that are already -# merged to 'next' branch from getting rebased, because allowing it -# would result in rebasing already published history. - -publish=next -basebranch="$1" -if test "$#" = 2 -then - topic="refs/heads/$2" -else - topic=`git symbolic-ref HEAD` || - exit 0 ;# we do not interrupt rebasing detached HEAD -fi - -case "$topic" in -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? - -# Does the topic really exist? -git show-ref -q "$topic" || { - echo >&2 "No such branch $topic" - exit 1 -} - -# Is topic fully merged to master? -not_in_master=`git-rev-list --pretty=oneline ^master "$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". |