remote-bzr: remove files before modifications

diff --git a/git-sh-setup.sh b/git-sh-setup.sh
index 795edd2852aa1c680c3db1776bb84aca7662899d..2f7835941ecaa48be17b6dd64e64fb0df3db37e2 100644 (file)
--- a/git-sh-setup.sh
+++ b/git-sh-setup.sh
@@ -84,14 +84,14 @@ if test -n "$OPTIONS_SPEC"; then
 else
        dashless=$(basename "$0" | sed -e 's/-/ /')
        usage() {
-               die "Usage: $dashless $USAGE"
+               die "usage: $dashless $USAGE"
        }
 
        if [ -z "$LONG_USAGE" ]
        then
-               LONG_USAGE="Usage: $dashless $USAGE"
+               LONG_USAGE="usage: $dashless $USAGE"
        else
-               LONG_USAGE="Usage: $dashless $USAGE
+               LONG_USAGE="usage: $dashless $USAGE
 
 $LONG_USAGE"
        fi
@@ -249,6 +249,18 @@ clear_local_git_env() {
        unset $(git rev-parse --local-env-vars)
 }
 
+# Generate a virtual base file for a two-file merge. Uses git apply to
+# remove lines from $1 that are not in $2, leaving only common lines.
+create_virtual_base() {
+       sz0=$(wc -c <"$1")
+       @@DIFF@@ -u -La/"$1" -Lb/"$1" "$1" "$2" | git apply --no-add
+       sz1=$(wc -c <"$1")
+
+       # If we do not have enough common material, it is not
+       # worth trying two-file merge using common subsections.
+       expr $sz0 \< $sz1 \* 2 >/dev/null || : >"$1"
+}
+
 
 # Platform specific tweaks to work around some commands
 case $(uname -s) in