git-commit: don't add multiple Signed-off-by: from the same identity

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index c22266b48650bc274bb890f164032ca8d64aee46..d77902d34d63583122eb76fda5d28ee7eeccd77d 100755 (executable)
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -13,6 +13,10 @@ set -e
 USAGE="git-filter-branch [-d TEMPDIR] [FILTERS] DESTBRANCH [REV-RANGE]"
 . git-sh-setup
 
+warn () {
+        echo "$*" >&2
+}
+
 map()
 {
        # if it was not rewritten, take the original
@@ -24,6 +28,16 @@ map()
        fi
 }
 
+# override die(): this version puts in an extra line break, so that
+# the progress is still visible
+
+die()
+{
+       echo >&2
+       echo "$*" >&2
+       exit 1
+}
+
 # When piped a commit, output a script to set the ident of either
 # "author" or "committer
 
@@ -177,23 +191,29 @@ while read commit parents; do
        export GIT_COMMIT=$commit
        git cat-file commit "$commit" >../commit
 
-       eval "$(set_ident AUTHOR <../commit)"
-       eval "$(set_ident COMMITTER <../commit)"
-       eval "$filter_env" < /dev/null
+       eval "$(set_ident AUTHOR <../commit)" ||
+               die "setting author failed for commit $commit"
+       eval "$(set_ident COMMITTER <../commit)" ||
+               die "setting committer failed for commit $commit"
+       eval "$filter_env" < /dev/null ||
+               die "env filter failed: $filter_env"
 
        if [ "$filter_tree" ]; then
                git checkout-index -f -u -a
                # files that $commit removed are now still in the working tree;
                # remove them, else they would be added again
                git ls-files -z --others | xargs -0 rm -f
-               eval "$filter_tree" < /dev/null
+               eval "$filter_tree" < /dev/null ||
+                       die "tree filter failed: $filter_tree"
+
                git diff-index -r $commit | cut -f 2- | tr '\n' '\0' | \
                        xargs -0 git update-index --add --replace --remove
                git ls-files -z --others | \
                        xargs -0 git update-index --add --replace --remove
        fi
 
-       eval "$filter_index" < /dev/null
+       eval "$filter_index" < /dev/null ||
+               die "index filter failed: $filter_index"
 
        parentstr=
        for parent in $parents; do
@@ -202,13 +222,15 @@ while read commit parents; do
                done
        done
        if [ "$filter_parent" ]; then
-               parentstr="$(echo "$parentstr" | eval "$filter_parent")"
+               parentstr="$(echo "$parentstr" | eval "$filter_parent")" ||
+                               die "parent filter failed: $filter_parent"
        fi
 
        sed -e '1,/^$/d' <../commit | \
-               eval "$filter_msg" | \
-               sh -c "$filter_commit" "git commit-tree" $(git write-tree) \
-                       $parentstr > ../map/$commit
+               eval "$filter_msg" > ../message ||
+                       die "msg filter failed: $filter_msg"
+       sh -c "$filter_commit" "git commit-tree" \
+               $(git write-tree) $parentstr < ../message > ../map/$commit
 done <../revs
 
 src_head=$(tail -n 1 ../revs | sed -e 's/ .*//')
@@ -245,7 +267,8 @@ if [ "$filter_tag_name" ]; then
                [ -f "../map/$sha1" ] || continue
                new_sha1="$(cat "../map/$sha1")"
                export GIT_COMMIT="$sha1"
-               new_ref="$(echo "$ref" | eval "$filter_tag_name")"
+               new_ref="$(echo "$ref" | eval "$filter_tag_name")" ||
+                       die "tag name filter failed: $filter_tag_name"
 
                echo "$ref -> $new_ref ($sha1 -> $new_sha1)"