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|
#!/bin/sh
#
# Copyright (c) 2005 Junio C Hamano.
#
USAGE='[--onto <newbase>] <upstream> [<branch>]'
LONG_USAGE='If <branch> is specified, switch to that branch first. Then,
extract commits in the current branch that are not in <upstream>,
and reconstruct the current on top of <upstream>, discarding the original
development history. If --onto <newbase> is specified, the history is
reconstructed on top of <newbase>, instead of <upstream>. For example,
while on "topic" branch:
A---B---C topic
/
D---E---F---G master
$ '"$0"' --onto master~1 master topic
would rewrite the history to look like this:
A'\''--B'\''--C'\'' topic
/
D---E---F---G master
'
. git-sh-setup
unset newbase
while case "$#" in 0) break ;; esac
do
case "$1" in
--onto)
test 2 -le "$#" || usage
newbase="$2"
shift
;;
-*)
usage
;;
*)
break
;;
esac
shift
done
# Make sure we do not have .dotest
if mkdir .dotest
then
rmdir .dotest
else
echo >&2 '
It seems that I cannot create a .dotest directory, and I wonder if you
are in the middle of patch application or another rebase. If that is not
the case, please rm -fr .dotest and run me again. I am stopping in case
you still have something valuable there.'
exit 1
fi
# The tree must be really really clean.
git-update-index --refresh || exit
diff=$(git-diff-index --cached --name-status -r HEAD)
case "$diff" in
?*) echo "$diff"
exit 1
;;
esac
# The upstream head must be given. Make sure it is valid.
upstream_name="$1"
upstream=`git rev-parse --verify "${upstream_name}^0"` ||
die "invalid upsteram $upstream_name"
# If the branch to rebase is given, first switch to it.
case "$#" in
2)
branch_name="$2"
git-checkout "$2" || usage
;;
*)
branch_name=`git symbolic-ref HEAD` || die "No current branch"
branch_name=`expr "$branch_name" : 'refs/heads/\(.*\)'`
;;
esac
branch=$(git-rev-parse --verify "${branch_name}^0") || exit
# Make sure the branch to rebase onto is valid.
onto_name=${newbase-"$upstream_name"}
onto=$(git-rev-parse --verify "${onto_name}^0") || exit
# Now we are rebasing commits $upstream..$branch on top of $onto
# Check if we are already based on $onto, but this should be
# done only when upstream and onto are the same.
if test "$upstream" = "onto"
then
mb=$(git-merge-base "$onto" "$branch")
if test "$mb" = "$onto"
then
echo >&2 "Current branch $branch_name is up to date."
exit 0
fi
fi
# Rewind the head to "$onto"; this saves our current head in ORIG_HEAD.
git-reset --hard "$onto"
# If the $onto is a proper descendant of the tip of the branch, then
# we just fast forwarded.
if test "$mb" = "$onto"
then
echo >&2 "Fast-forwarded $branch to $newbase."
exit 0
fi
git-format-patch -k --stdout --full-index "$upstream" ORIG_HEAD |
git am --binary -3 -k
|
