filter-branch: Add more error-handling

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

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index 86eef562978f331f1d6e8f187dfc44e3fdd03e16..27b57b826a26d80551169b355a5e8fc1a35de994 100755 (executable)
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -221,7 +221,7 @@ die ""
 trap 'cd ../..; rm -rf "$tempdir"' 0
 
 # Make sure refs/original is empty
-git for-each-ref > "$tempdir"/backup-refs
+git for-each-ref > "$tempdir"/backup-refs || exit
 while read sha1 type name
 do
        case "$force,$name" in
@@ -241,8 +241,9 @@ GIT_WORK_TREE=.
 export GIT_DIR GIT_WORK_TREE
 
 # The refs should be updated if their heads were rewritten
-git rev-parse --no-flags --revs-only --symbolic-full-name --default HEAD "$@" |
-sed -e '/^^/d' >"$tempdir"/heads
+git rev-parse --no-flags --revs-only --symbolic-full-name \
+       --default HEAD "$@" > "$tempdir"/raw-heads || exit
+sed -e '/^^/d' "$tempdir"/raw-heads >"$tempdir"/heads
 
 test -s "$tempdir"/heads ||
        die "Which ref do you want to rewrite?"
@@ -251,8 +252,6 @@ GIT_INDEX_FILE="$(pwd)/../index"
 export GIT_INDEX_FILE
 git read-tree || die "Could not seed the index"
 
-ret=0
-
 # map old->new commit ids for rewriting parents
 mkdir ../map || die "Could not create map/ directory"
 
@@ -315,10 +314,11 @@ while read commit parents; do
                        die "tree filter failed: $filter_tree"
 
                (
-                       git diff-index -r --name-only $commit
+                       git diff-index -r --name-only $commit &&
                        git ls-files --others
-               ) |
-               git update-index --add --replace --remove --stdin
+               ) > "$tempdir"/tree-state || exit
+               git update-index --add --replace --remove --stdin \
+                       < "$tempdir"/tree-state || exit
        fi
 
        eval "$filter_index" < /dev/null ||
@@ -339,7 +339,8 @@ while read commit parents; do
                eval "$filter_msg" > ../message ||
                        die "msg filter failed: $filter_msg"
        @SHELL_PATH@ -c "$filter_commit" "git commit-tree" \
-               $(git write-tree) $parentstr < ../message > ../map/$commit
+               $(git write-tree) $parentstr < ../message > ../map/$commit ||
+                       die "could not write rewritten commit"
 done <../revs
 
 # In case of a subdirectory filter, it is possible that a specified head
@@ -407,7 +408,8 @@ do
                        die "Could not rewrite $ref"
        ;;
        esac
-       git update-ref -m "filter-branch: backup" "$orig_namespace$ref" $sha1
+       git update-ref -m "filter-branch: backup" "$orig_namespace$ref" $sha1 ||
+                exit
 done < "$tempdir"/heads
 
 # TODO: This should possibly go, with the semantics that all positive given
@@ -483,7 +485,7 @@ test -z "$ORIG_GIT_INDEX_FILE" || {
 }
 
 if [ "$(is_bare_repository)" = false ]; then
-       git read-tree -u -m HEAD
+       git read-tree -u -m HEAD || exit
 fi
 
-exit $ret
+exit 0