Merge branch 'bc/hash-algo' into maint

[git-core/git.git] / git-filter-branch.sh

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index 3a74602..1b7e4b2 100755 (executable)
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -81,12 +81,12 @@ set_ident () {
        finish_ident COMMITTER
 }
 
-USAGE="[--setup <command>] [--env-filter <command>]
+USAGE="[--setup <command>] [--subdirectory-filter <directory>] [--env-filter <command>]
        [--tree-filter <command>] [--index-filter <command>]
        [--parent-filter <command>] [--msg-filter <command>]
        [--commit-filter <command>] [--tag-name-filter <command>]
-       [--subdirectory-filter <directory>] [--original <namespace>]
-       [-d <directory>] [-f | --force]
+       [--original <namespace>]
+       [-d <directory>] [-f | --force] [--state-branch <branch>]
        [--] [<rev-list options>...]"
 
 OPTIONS_SPEC=
@@ -106,6 +106,7 @@ filter_msg=cat
 filter_commit=
 filter_tag_name=
 filter_subdir=
+state_branch=
 orig_namespace=refs/original/
 force=
 prune_empty=
@@ -153,6 +154,10 @@ do
        --setup)
                filter_setup="$OPTARG"
                ;;
+       --subdirectory-filter)
+               filter_subdir="$OPTARG"
+               remap_to_ancestor=t
+               ;;
        --env-filter)
                filter_env="$OPTARG"
                ;;
@@ -174,13 +179,12 @@ do
        --tag-name-filter)
                filter_tag_name="$OPTARG"
                ;;
-       --subdirectory-filter)
-               filter_subdir="$OPTARG"
-               remap_to_ancestor=t
-               ;;
        --original)
                orig_namespace=$(expr "$OPTARG/" : '\(.*[^/]\)/*$')/
                ;;
+       --state-branch)
+               state_branch="$OPTARG"
+               ;;
        *)
                usage
                ;;
@@ -219,6 +223,13 @@ trap 'cd "$orig_dir"; rm -rf "$tempdir"' 0
 ORIG_GIT_DIR="$GIT_DIR"
 ORIG_GIT_WORK_TREE="$GIT_WORK_TREE"
 ORIG_GIT_INDEX_FILE="$GIT_INDEX_FILE"
+ORIG_GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME"
+ORIG_GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL"
+ORIG_GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE"
+ORIG_GIT_COMMITTER_NAME="$GIT_COMMITTER_NAME"
+ORIG_GIT_COMMITTER_EMAIL="$GIT_COMMITTER_EMAIL"
+ORIG_GIT_COMMITTER_DATE="$GIT_COMMITTER_DATE"
+
 GIT_WORK_TREE=.
 export GIT_DIR GIT_WORK_TREE
 
@@ -252,6 +263,26 @@ export GIT_INDEX_FILE
 # map old->new commit ids for rewriting parents
 mkdir ../map || die "Could not create map/ directory"
 
+if test -n "$state_branch"
+then
+       state_commit=$(git rev-parse --no-flags --revs-only "$state_branch")
+       if test -n "$state_commit"
+       then
+               echo "Populating map from $state_branch ($state_commit)" 1>&2
+               perl -e'open(MAP, "-|", "git show $ARGV[0]:filter.map") or die;
+                       while (<MAP>) {
+                               m/(.*):(.*)/ or die;
+                               open F, ">../map/$1" or die;
+                               print F "$2" or die;
+                               close(F) or die;
+                       }
+                       close(MAP) or die;' "$state_commit" \
+                               || die "Unable to load state from $state_branch:filter.map"
+       else
+               echo "Branch $state_branch does not exist. Will create" 1>&2
+       fi
+fi
+
 # we need "--" only if there are no path arguments in $@
 nonrevs=$(git rev-parse --no-revs "$@") || exit
 if test -z "$nonrevs"
@@ -530,7 +561,7 @@ if [ "$filter_tag_name" ]; then
                                        }' \
                                    -e '/^-----BEGIN PGP SIGNATURE-----/q' \
                                    -e 'p' ) |
-                               git mktag) ||
+                               git hash-object -t tag -w --stdin) ||
                                die "Could not create new tag object for $ref"
                        if git cat-file tag "$ref" | \
                           sane_grep '^-----BEGIN PGP SIGNATURE-----' >/dev/null 2>&1
@@ -544,12 +575,9 @@ if [ "$filter_tag_name" ]; then
        done
 fi
 
-cd "$orig_dir"
-rm -rf "$tempdir"
-
-trap - 0
-
 unset GIT_DIR GIT_WORK_TREE GIT_INDEX_FILE
+unset GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE
+unset GIT_COMMITTER_NAME GIT_COMMITTER_EMAIL GIT_COMMITTER_DATE
 test -z "$ORIG_GIT_DIR" || {
        GIT_DIR="$ORIG_GIT_DIR" && export GIT_DIR
 }
@@ -561,6 +589,58 @@ test -z "$ORIG_GIT_INDEX_FILE" || {
        GIT_INDEX_FILE="$ORIG_GIT_INDEX_FILE" &&
        export GIT_INDEX_FILE
 }
+test -z "$ORIG_GIT_AUTHOR_NAME" || {
+       GIT_AUTHOR_NAME="$ORIG_GIT_AUTHOR_NAME" &&
+       export GIT_AUTHOR_NAME
+}
+test -z "$ORIG_GIT_AUTHOR_EMAIL" || {
+       GIT_AUTHOR_EMAIL="$ORIG_GIT_AUTHOR_EMAIL" &&
+       export GIT_AUTHOR_EMAIL
+}
+test -z "$ORIG_GIT_AUTHOR_DATE" || {
+       GIT_AUTHOR_DATE="$ORIG_GIT_AUTHOR_DATE" &&
+       export GIT_AUTHOR_DATE
+}
+test -z "$ORIG_GIT_COMMITTER_NAME" || {
+       GIT_COMMITTER_NAME="$ORIG_GIT_COMMITTER_NAME" &&
+       export GIT_COMMITTER_NAME
+}
+test -z "$ORIG_GIT_COMMITTER_EMAIL" || {
+       GIT_COMMITTER_EMAIL="$ORIG_GIT_COMMITTER_EMAIL" &&
+       export GIT_COMMITTER_EMAIL
+}
+test -z "$ORIG_GIT_COMMITTER_DATE" || {
+       GIT_COMMITTER_DATE="$ORIG_GIT_COMMITTER_DATE" &&
+       export GIT_COMMITTER_DATE
+}
+
+if test -n "$state_branch"
+then
+       echo "Saving rewrite state to $state_branch" 1>&2
+       state_blob=$(
+               perl -e'opendir D, "../map" or die;
+                       open H, "|-", "git hash-object -w --stdin" or die;
+                       foreach (sort readdir(D)) {
+                               next if m/^\.\.?$/;
+                               open F, "<../map/$_" or die;
+                               chomp($f = <F>);
+                               print H "$_:$f\n" or die;
+                       }
+                       close(H) or die;' || die "Unable to save state")
+       state_tree=$(/bin/echo -e "100644 blob $state_blob\tfilter.map" | git mktree)
+       if test -n "$state_commit"
+       then
+               state_commit=$(/bin/echo "Sync" | git commit-tree "$state_tree" -p "$state_commit")
+       else
+               state_commit=$(/bin/echo "Sync" | git commit-tree "$state_tree" )
+       fi
+       git update-ref "$state_branch" "$state_commit"
+fi
+
+cd "$orig_dir"
+rm -rf "$tempdir"
+
+trap - 0
 
 if [ "$(is_bare_repository)" = false ]; then
        git read-tree -u -m HEAD || exit