X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=git-rebase.sh;h=638ff0dbc01cbf87edf1af511d5caac5ee4f1d66;hb=287f860054345505e4f737466279efa6c3ff04b5;hp=2bc3a12995ec5f18cf666289a6691fa2e4d3fb47;hpb=36d277c72d90d32f99616072b64a2652248f5264;p=git.git

diff --git a/git-rebase.sh b/git-rebase.sh
index 2bc3a129..638ff0db 100755
--- a/git-rebase.sh
+++ b/git-rebase.sh
@@ -5,9 +5,25 @@
 
 . 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)
@@ -23,6 +39,16 @@ case "$#" in
 	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 |