# Copyright (c) 2005 Junio C Hamano.
#
-. git-sh-setup || die "Not a git archive."
+. git-sh-setup
-# The other head is given
+# 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 other head is given. Make sure it is valid.
other=$(git-rev-parse --verify "$1^0") || exit
+# Make sure we have HEAD that is valid.
+head=$(git-rev-parse --verify "HEAD^0") || exit
+
# The tree must be really really clean.
git-update-index --refresh || exit
diff=$(git-diff-index --cached --name-status -r HEAD)
git-checkout "$2" || exit
esac
+# If the HEAD is a proper descendant of $other, we do not even need
+# to rebase. Make sure we do not do needless rebase. In such a
+# case, merge-base should be the same as "$other".
+mb=$(git-merge-base "$other" "$head")
+if test "$mb" = "$other"
+then
+ echo >&2 "Current branch `git-symbolic-ref HEAD` is up to date."
+ exit 0
+fi
+
# Rewind the head to "$other"
git-reset --hard "$other"
git-format-patch -k --stdout --full-index "$other" ORIG_HEAD |