X-Git-Url: https://git.verplant.org/?a=blobdiff_plain;f=git-fetch-script;h=f9f90b6db15d9e178bf7cea586f0fd41c75ca032;hb=0516de30e8bdd26086e2a3edd3375981fd0c34d6;hp=a70909e4ff15035d135eed061de8b4ea70ac5060;hpb=92c533ef0ea2cb43f0d7d493f006f5b4dfa7cda1;p=git.git

diff --git a/git-fetch-script b/git-fetch-script
index a70909e4..f9f90b6d 100755
--- a/git-fetch-script
+++ b/git-fetch-script
@@ -6,19 +6,37 @@ _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
 
 append=
+force=
+update_head_ok=
+while case "$#" in 0) break ;; esac
+do
+	case "$1" in
+	-a|--a|--ap|--app|--appe|--appen|--append)
+		append=t
+		;;
+	-f|--f|--fo|--for|--forc|--force)
+		force=t
+		;;
+	-u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
+	--update-he|--update-hea|--update-head|--update-head-|\
+	--update-head-o|--update-head-ok)
+		update_head_ok=t
+		;;
+	*)
+		break
+		;;
+	esac
+	shift
+done
+
 case "$#" in
 0)
 	test -f "$GIT_DIR/branches/origin" ||
 		test -f "$GIT_DIR/remotes/origin" ||
-			die "Where do you want to fetch from?"
+			die "Where do you want to fetch from today?"
 	set origin ;;
-*)
-	case "$1" in
-	-a|--a|--ap|--app|--appe|--appen|--append)
-		append=t
-		shift ;;
-	esac
 esac
+
 remote_nick="$1"
 remote=$(get_remote_url "$@")
 refs=
@@ -37,21 +55,41 @@ append_fetch_head () {
     remote_nick_="$4"
     local_name_="$5"
 
+    # remote-nick is the URL given on the command line (or a shorthand)
+    # remote-name is the $GIT_DIR relative refs/ path we computed
+    # for this refspec.
+    case "$remote_name_" in
+    HEAD)
+	note_= ;;
+    refs/heads/*)
+	note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
+	note_="branch '$note_' of " ;;
+    refs/tags/*)
+	note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
+	note_="tag '$note_' of " ;;
+    *)
+	note_="$remote_name of " ;;
+    esac
+    remote_1_=$(expr "$remote_" : '\(.*\)\.git/*$') &&
+	remote_="$remote_1_"
+    note_="$note_$remote_"
+
     # 2.6.11-tree tag would not be happy to be fed to resolve.
     if git-cat-file commit "$head_" >/dev/null 2>&1
     then
-	head_=$(git-rev-parse --verify "$head_^0") || exit
-	note_="$head_	$remote_name_ from $remote_nick_"
-	echo "$note_" >>$GIT_DIR/FETCH_HEAD
-	echo >&2 "* committish: $note_"
+	headc_=$(git-rev-parse --verify "$head_^0") || exit
+	echo "$headc_	$note_" >>$GIT_DIR/FETCH_HEAD
+	echo >&2 "* committish: $head_"
+	echo >&2 "  $note_"
     else
-	echo >&2 "* non-commit: $note_"
+	echo >&2 "* non-commit: $head_"
+	echo >&2 "  $note_"
     fi
     if test "$local_name_" != ""
     then
 	# We are storing the head locally.  Make sure that it is
 	# a fast forward (aka "reverse push").
-	fast_forward_local "$local_name_" "$head_" "$remote_" "$remote_name_"
+	fast_forward_local "$local_name_" "$head_" "$note_"
     fi
 }
 
@@ -60,7 +98,14 @@ fast_forward_local () {
     refs/tags/*)
 	# Tags need not be pointing at commits so there
 	# is no way to guarantee "fast-forward" anyway.
+	if test -f "$GIT_DIR/$1"
+	then
+		echo >&2 "* $1: updating with $3"
+	else
+		echo >&2 "* $1: storing $3"
+	fi
 	echo "$2" >"$GIT_DIR/$1" ;;
+
     refs/heads/*)
 	# NEEDSWORK: use the same cmpxchg protocol here.
 	echo "$2" >"$GIT_DIR/$1.lock"
@@ -70,24 +115,28 @@ fast_forward_local () {
 	    mb=$(git-merge-base "$local" "$2") &&
 	    case "$2,$mb" in
 	    $local,*)
-		echo >&2 "* $1: same as $4"
-		echo >&2 "  from $3"
+		echo >&2 "* $1: same as $3"
 		;;
 	    *,$local)
-		echo >&2 "* $1: fast forward to $4"
-		echo >&2 "  from $3"
+		echo >&2 "* $1: fast forward to $3"
 		;;
 	    *)
 		false
 		;;
 	    esac || {
-		mv "$GIT_DIR/$1.lock" "$GIT_DIR/$1.remote"
-		echo >&2 "* $1: does not fast forward to $4"
-		echo >&2 "  from $3; leaving it in '$1.remote'"
+		echo >&2 "* $1: does not fast forward to $3;"
+		case "$force,$single_force" in
+		t,* | *,t)
+			echo >&2 "  forcing update."
+			;;
+		*)
+			mv "$GIT_DIR/$1.lock" "$GIT_DIR/$1.remote"
+			echo >&2 "  leaving it in '$1.remote'"
+			;;
+		esac
 	    }
 	else
-		echo >&2 "* $1: storing $4"
-		echo >&2 "  from $3."
+		echo >&2 "* $1: storing $3"
 	fi
 	test -f "$GIT_DIR/$1.lock" &&
 	    mv "$GIT_DIR/$1.lock" "$GIT_DIR/$1"
@@ -95,12 +144,25 @@ fast_forward_local () {
     esac
 }
 
+case "$update_head_ok" in
+'')
+	orig_head=$(cat "$GIT_DIR/HEAD" 2>/dev/null)
+	;;
+esac
+
 for ref in $(get_remote_refs_for_fetch "$@")
 do
     refs="$refs $ref"
 
     # These are relative path from $GIT_DIR, typically starting at refs/
     # but may be HEAD
+    if expr "$ref" : '\+' >/dev/null
+    then
+	single_force=t
+	ref=$(expr "$ref" : '\+\(.*\)')
+    else
+	single_force=
+    fi
     remote_name=$(expr "$ref" : '\([^:]*\):')
     local_name=$(expr "$ref" : '[^:]*:\(.*\)')
 
@@ -114,7 +176,7 @@ do
 	fi
 	head=$(curl -nsf $curl_extra_args "$remote/$remote_name") &&
 	expr "$head" : "$_x40\$" >/dev/null ||
-	    die "Failed to fetch $remote_name from $remote"
+		die "Failed to fetch $remote_name from $remote"
 	echo Fetching "$remote_name from $remote" using http
 	git-http-pull -v -a "$head" "$remote/" || exit
 	;;
@@ -146,9 +208,14 @@ http://* | https://* | rsync://* )
     while read sha1 remote_name
     do
 	found=
+	single_force=
 	for ref in $refs
 	do
 	    case "$ref" in
+	    +$remote_name:*)
+		single_force=t
+		found="$ref"
+		break ;;
 	    $remote_name:*)
 		found="$ref"
 		break ;;
@@ -156,7 +223,22 @@ http://* | https://* | rsync://* )
 	done
 
 	local_name=$(expr "$found" : '[^:]*:\(.*\)')
-        append_fetch_head "$sha1" "$remote" "$remote_name" "$remote_nick" "$local_name"
+	append_fetch_head "$sha1" "$remote" "$remote_name" "$remote_nick" "$local_name"
     done
     ;;
 esac
+
+# If the original head was empty (i.e. no "master" yet), or
+# if we were told not to worry, we do not have to check.
+case ",$update_head_ok,$orig_head," in
+*,, | t,* )
+	;;
+*)
+	curr_head=$(cat "$GIT_DIR/HEAD" 2>/dev/null)
+	if test "$curr_head" != "$orig_head"
+	then
+		echo "$orig_head" >$GIT_DIR/HEAD
+		die "Cannot fetch into the current branch."
+	fi
+	;;
+esac