Reduce the number of connects when fetching

diff --git a/git-rebase.sh b/git-rebase.sh
index e3ad7dedc4c27c505ae1278ed9e108d43bdca32d..bdcea0ed703057e08fd4204245f4f0c8a308f8d0 100755 (executable)
--- a/git-rebase.sh
+++ b/git-rebase.sh
@@ -61,7 +61,7 @@ continue_merge () {
        fi
 
        cmt=`cat "$dotest/current"`
-       if ! git diff-index --quiet HEAD
+       if ! git diff-index --quiet HEAD --
        then
                if ! git-commit -C "$cmt"
                then
@@ -88,7 +88,7 @@ call_merge () {
        cmt="$(cat "$dotest/cmt.$1")"
        echo "$cmt" > "$dotest/current"
        hd=$(git rev-parse --verify HEAD)
-       cmt_name=$(git symbolic-ref HEAD)
+       cmt_name=$(git symbolic-ref HEAD 2> /dev/null || echo HEAD)
        msgnum=$(cat "$dotest/msgnum")
        end=$(cat "$dotest/end")
        eval GITHEAD_$cmt='"${cmt_name##refs/heads/}~$(($end - $msgnum))"'
@@ -116,7 +116,24 @@ call_merge () {
        esac
 }
 
+move_to_original_branch () {
+       test -z "$head_name" &&
+               head_name="$(cat "$dotest"/head-name)" &&
+               onto="$(cat "$dotest"/onto)" &&
+               orig_head="$(cat "$dotest"/orig-head)"
+       case "$head_name" in
+       refs/*)
+               message="rebase finished: $head_name onto $onto"
+               git update-ref -m "$message" \
+                       $head_name $(git rev-parse HEAD) $orig_head &&
+               git symbolic-ref HEAD $head_name ||
+               die "Could not move back to $head_name"
+               ;;
+       esac
+}
+
 finish_rb_merge () {
+       move_to_original_branch
        rm -r "$dotest"
        echo "All done."
 }
@@ -154,10 +171,15 @@ do
                        finish_rb_merge
                        exit
                fi
-               git am --resolved --3way --resolvemsg="$RESOLVEMSG"
+               head_name=$(cat .dotest/head-name) &&
+               onto=$(cat .dotest/onto) &&
+               orig_head=$(cat .dotest/orig-head) &&
+               git am --resolved --3way --resolvemsg="$RESOLVEMSG" &&
+               move_to_original_branch
                exit
                ;;
        --skip)
+               git reset --hard HEAD || exit $?
                if test -d "$dotest"
                then
                        git rerere clear
@@ -174,16 +196,23 @@ do
                        finish_rb_merge
                        exit
                fi
-               git am -3 --skip --resolvemsg="$RESOLVEMSG"
+               head_name=$(cat .dotest/head-name) &&
+               onto=$(cat .dotest/onto) &&
+               orig_head=$(cat .dotest/orig-head) &&
+               git am -3 --skip --resolvemsg="$RESOLVEMSG" &&
+               move_to_original_branch
                exit
                ;;
        --abort)
                git rerere clear
                if test -d "$dotest"
                then
+                       move_to_original_branch
                        rm -r "$dotest"
                elif test -d .dotest
                then
+                       dotest=.dotest
+                       move_to_original_branch
                        rm -r .dotest
                else
                        die "No rebase in progress?"
@@ -256,7 +285,7 @@ fi
 
 # The tree must be really really clean.
 git update-index --refresh || exit
-diff=$(git diff-index --cached --name-status -r HEAD)
+diff=$(git diff-index --cached --name-status -r HEAD --)
 case "$diff" in
 ?*)    echo "cannot rebase: your index is not up-to-date"
        echo "$diff"
@@ -319,6 +348,19 @@ then
        GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
 fi
 
+# move to a detached HEAD
+orig_head=$(git rev-parse HEAD^0)
+head_name=$(git symbolic-ref HEAD 2> /dev/null)
+case "$head_name" in
+'')
+       head_name="detached HEAD"
+       ;;
+*)
+       git checkout "$orig_head" > /dev/null 2>&1 ||
+               die "could not detach HEAD"
+       ;;
+esac
+
 # Rewind the head to "$onto"; this saves our current head in ORIG_HEAD.
 echo "First, rewinding head to replay your work on top of it..."
 git-reset --hard "$onto"
@@ -328,14 +370,21 @@ git-reset --hard "$onto"
 if test "$mb" = "$branch"
 then
        echo >&2 "Fast-forwarded $branch_name to $onto_name."
+       move_to_original_branch
        exit 0
 fi
 
 if test -z "$do_merge"
 then
        git format-patch -k --stdout --full-index --ignore-if-in-upstream "$upstream"..ORIG_HEAD |
-       git am $git_am_opt --binary -3 -k --resolvemsg="$RESOLVEMSG"
-       exit $?
+       git am $git_am_opt --binary -3 -k --resolvemsg="$RESOLVEMSG" &&
+       move_to_original_branch
+       ret=$?
+       test 0 != $ret -a -d .dotest &&
+               echo $head_name > .dotest/head-name &&
+               echo $onto > .dotest/onto &&
+               echo $orig_head > .dotest/orig-head
+       exit $ret
 fi
 
 # start doing a rebase with git-merge
@@ -344,8 +393,10 @@ fi
 mkdir -p "$dotest"
 echo "$onto" > "$dotest/onto"
 echo "$onto_name" > "$dotest/onto_name"
-prev_head=`git rev-parse HEAD^0`
+prev_head=$orig_head
 echo "$prev_head" > "$dotest/prev_head"
+echo "$orig_head" > "$dotest/orig-head"
+echo "$head_name" > "$dotest/head-name"
 
 msgnum=0
 for cmt in `git rev-list --reverse --no-merges "$upstream"..ORIG_HEAD`