X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=topgit.git;a=blobdiff_plain;f=tg-create.sh;h=2edd5379d54c9cc533a0904dafc51b6f566e728c;hp=3f33fa83d69472e44f7100ffc477f8035cf81fcb;hb=566ea3fef82d408955285b2928b3f481486b809f;hpb=24588bf223065e5244fd72c97a8a621055a7e87d

diff --git a/tg-create.sh b/tg-create.sh
index 3f33fa8..2edd537 100644
--- a/tg-create.sh
+++ b/tg-create.sh
@@ -7,6 +7,7 @@ deps= # List of dependent branches
 restarted= # Set to 1 if we are picking up in the middle of base setup
 merge= # List of branches to be merged; subset of $deps
 name=
+rname= # Remote branch to base this one on
 
 
 ## Parse options
@@ -14,8 +15,10 @@ name=
 while [ -n "$1" ]; do
 	arg="$1"; shift
 	case "$arg" in
+	-r)
+		rname="$1"; shift;;
 	-*)
-		echo "Usage: tg create NAME [DEPS...]" >&2
+		echo "Usage: tg [...] create NAME [DEPS...|-r RNAME]" >&2
 		exit 1;;
 	*)
 		if [ -z "$name" ]; then
@@ -27,6 +30,20 @@ while [ -n "$1" ]; do
 done
 
 
+## Fast-track creating branches based on remote ones
+
+if [ -n "$rname" ]; then
+	[ -n "$name" ] || die "no branch name given"
+	! ref_exists "$name" || die "branch '$name' already exists"
+	has_remote "$rname" || die "no branch $rname in remote $base_remote"
+
+	git update-ref "refs/top-bases/$name" "refs/remotes/$base_remote/top-bases/$rname"
+	git update-ref "refs/heads/$name" "refs/remotes/$base_remote/$rname"
+	info "Topic branch $name based on $base_remote : $rname set up."
+	exit 0
+fi
+
+
 ## Auto-guess dependencies
 
 deps="${deps# }"
@@ -51,19 +68,19 @@ fi
 [ -n "$merge" -o -n "$restarted" ] || merge="$deps "
 
 for d in $deps; do
-	git rev-parse --verify "$d" >/dev/null 2>&1 ||
+	ref_exists "$d"  ||
 		die "unknown branch dependency '$d'"
 done
-! git rev-parse --verify "$name" >/dev/null 2>&1 ||
+! ref_exists "$name"  ||
 	die "branch '$name' already exists"
 
 # Clean up any stale stuff
 rm -f "$git_dir/top-name" "$git_dir/top-deps" "$git_dir/top-merge"
 
 
-## Create base
+## Find starting commit to create the base
 
-if [ -n "$merge" ]; then
+if [ -n "$merge" -a -z "$restarted" ]; then
 	# Unshift the first item from the to-merge list
 	branch="${merge%% *}"
 	merge="${merge#* }"
@@ -82,7 +99,7 @@ while [ -n "$merge" ]; do
 	info "Merging $name base with $branch..."
 
 	if ! git merge "$branch"; then
-		info "Please commit merge resolution and call: tg create"
+		info "Please commit merge resolution and call: $tg create"
 		info "It is also safe to abort this operation using:"
 		info "git reset --hard some_branch"
 		info "(You are on a detached HEAD now.)"
@@ -123,4 +140,6 @@ git add -f "$root_dir/.topmsg"
 
 
 info "Topic branch $name set up. Please fill .topmsg now and make initial commit."
-info "To abort: git rm -f .top* && git checkout ${deps%% *} && tg delete $name"
+info "To abort: git rm -f .top* && git checkout ${deps%% *} && $tg delete $name"
+
+# vim:noet