tree-diff: rework diff_tree interface to be sha1 based

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index 53142492afcfb92f0453359af9a00a045c51e7e9..86d6994619151fb63327848e6763b07971017ad7 100755 (executable)
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -199,6 +199,7 @@ t)
        test -d "$tempdir" &&
                die "$tempdir already exists, please remove it"
 esac
+orig_dir=$(pwd)
 mkdir -p "$tempdir/t" &&
 tempdir="$(cd "$tempdir"; pwd)" &&
 cd "$tempdir/t" &&
@@ -206,7 +207,7 @@ workdir="$(pwd)" ||
 die ""
 
 # Remove tempdir on exit
-trap 'cd ../..; rm -rf "$tempdir"' 0
+trap 'cd "$orig_dir"; rm -rf "$tempdir"' 0
 
 ORIG_GIT_DIR="$GIT_DIR"
 ORIG_GIT_WORK_TREE="$GIT_WORK_TREE"
@@ -254,7 +255,7 @@ else
        remap_to_ancestor=t
 fi
 
-rev_args=$(git rev-parse --revs-only "$@")
+git rev-parse --revs-only "$@" >../parse
 
 case "$filter_subdir" in
 "")
@@ -267,7 +268,7 @@ case "$filter_subdir" in
 esac
 
 git rev-list --reverse --topo-order --default HEAD \
-       --parents --simplify-merges $rev_args "$@" > ../revs ||
+       --parents --simplify-merges --stdin "$@" <../parse >../revs ||
        die "Could not get the commits"
 commits=$(wc -l <../revs | tr -d " ")
 
@@ -282,11 +283,12 @@ while read commit parents; do
 
        case "$filter_subdir" in
        "")
-               git read-tree -i -m $commit
+               GIT_ALLOW_NULL_SHA1=1 git read-tree -i -m $commit
                ;;
        *)
                # The commit may not have the subdirectory at all
-               err=$(git read-tree -i -m $commit:"$filter_subdir" 2>&1) || {
+               err=$(GIT_ALLOW_NULL_SHA1=1 \
+                     git read-tree -i -m $commit:"$filter_subdir" 2>&1) || {
                        if ! git rev-parse -q --verify $commit:"$filter_subdir"
                        then
                                rm -f "$GIT_INDEX_FILE"
@@ -469,7 +471,7 @@ if [ "$filter_tag_name" ]; then
        done
 fi
 
-cd ../..
+cd "$orig_dir"
 rm -rf "$tempdir"
 
 trap - 0