Update the git-ls-tree documentation

[git.git] / git-rebase.sh

diff --git a/git-rebase.sh b/git-rebase.sh
index 5289762..638ff0d 100755 (executable)
--- a/git-rebase.sh
+++ b/git-rebase.sh
@@ -3,11 +3,27 @@
 # 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)
@@ -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 |