From 75c69766554c4b34ede65502d481dd7beb7f3388 Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Fri, 23 Aug 2013 20:10:42 -0400 Subject: rebase -i: fix short SHA-1 collision The 'todo' sheet for interactive rebase shows abbreviated SHA-1's and then performs its operations upon those shortened values. This can lead to an abort if the SHA-1 of a reworded or edited commit is no longer unique within the abbreviated SHA-1 space and a subsequent SHA-1 in the todo list has the same abbreviated value. For example: edit f00dfad first pick badbeef second If, after editing, the new SHA-1 of "first" also has prefix badbeef, then the subsequent 'pick badbeef second' will fail since badbeef is no longer a unique SHA-1 abbreviation: error: short SHA1 badbeef is ambiguous. fatal: Needed a single revision Invalid commit name: badbeef Fix this problem by expanding the SHA-1's in the todo list before performing the operations. [es: also collapse & expand SHA-1's for --edit-todo; respect core.commentchar in transform_todo_ids(); compose commit message] Signed-off-by: Eric Sunshine Signed-off-by: Junio C Hamano --- git-rebase--interactive.sh | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) (limited to 'git-rebase--interactive.sh') diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh index 83d6d4676b..b97a1d07cb 100644 --- a/git-rebase--interactive.sh +++ b/git-rebase--interactive.sh @@ -689,6 +689,32 @@ skip_unnecessary_picks () { die "Could not skip unnecessary pick commands" } +transform_todo_ids () { + while read -r command rest + do + case "$command" in + "$comment_char"* | exec) + # Be careful for oddball commands like 'exec' + # that do not have a SHA-1 at the beginning of $rest. + ;; + *) + sha1=$(git rev-parse --verify --quiet "$@" ${rest%% *}) && + rest="$sha1 ${rest#* }" + ;; + esac + printf '%s\n' "$command${rest:+ }$rest" + done <"$todo" >"$todo.new" && + mv -f "$todo.new" "$todo" +} + +expand_todo_ids() { + transform_todo_ids +} + +collapse_todo_ids() { + transform_todo_ids --short=7 +} + # Rearrange the todo list that has both "pick sha1 msg" and # "pick sha1 fixup!/squash! msg" appears in it so that the latter # comes immediately after the former, and change "pick" to @@ -841,6 +867,7 @@ skip) edit-todo) git stripspace --strip-comments <"$todo" >"$todo".new mv -f "$todo".new "$todo" + collapse_todo_ids append_todo_help git stripspace --comment-lines >>"$todo" <<\EOF @@ -852,6 +879,7 @@ EOF git_sequence_editor "$todo" || die "Could not execute editor" + expand_todo_ids exit ;; @@ -1008,6 +1036,8 @@ git_sequence_editor "$todo" || has_action "$todo" || die_abort "Nothing to do" +expand_todo_ids + test -d "$rewritten" || test -n "$force_rebase" || skip_unnecessary_picks GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name" -- cgit v1.2.3