From 370799596081e1d1f862e42305ba8119183bde94 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Galan=20R=C3=A9mi?= Date: Mon, 29 Jun 2015 22:20:31 +0200 Subject: [PATCH] git rebase -i: warn about removed commits MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Check if commits were removed (i.e. a line was deleted) and print warnings or stop git rebase depending on the value of the configuration variable rebase.missingCommitsCheck. This patch gives the user the possibility to avoid silent loss of information (losing a commit through deleting the line in this case) if he wants. Add the configuration variable rebase.missingCommitsCheck. - When unset or set to "ignore", no checking is done. - When set to "warn", the commits are checked, warnings are displayed but git rebase still proceeds. - When set to "error", the commits are checked, warnings are displayed and the rebase is stopped. (The user can then use 'git rebase --edit-todo' and 'git rebase --continue', or 'git rebase --abort') rebase.missingCommitsCheck defaults to "ignore". Signed-off-by: Galan Rémi Signed-off-by: Junio C Hamano --- Documentation/config.txt | 11 ++++ Documentation/git-rebase.txt | 6 +++ git-rebase--interactive.sh | 117 ++++++++++++++++++++++++++++++++++++++++-- t/t3404-rebase-interactive.sh | 66 ++++++++++++++++++++++++ 4 files changed, 197 insertions(+), 3 deletions(-) diff --git a/Documentation/config.txt b/Documentation/config.txt index 5f76e8cf4e..8169308aad 100644 --- a/Documentation/config.txt +++ b/Documentation/config.txt @@ -2160,6 +2160,17 @@ rebase.autoStash:: successful rebase might result in non-trivial conflicts. Defaults to false. +rebase.missingCommitsCheck:: + If set to "warn", git rebase -i will print a warning if some + commits are removed (e.g. a line was deleted), however the + rebase will still proceed. If set to "error", it will print + the previous warning and stop the rebase, 'git rebase + --edit-todo' can then be used to correct the error. If set to + "ignore", no checking is done. + To drop a commit without warning or error, use the `drop` + command in the todo-list. + Defaults to "ignore". + receive.advertiseAtomic:: By default, git-receive-pack will advertise the atomic push capability to its clients. If you don't want to this capability diff --git a/Documentation/git-rebase.txt b/Documentation/git-rebase.txt index 34bd070af8..2ca3b8d599 100644 --- a/Documentation/git-rebase.txt +++ b/Documentation/git-rebase.txt @@ -213,6 +213,12 @@ rebase.autoSquash:: rebase.autoStash:: If set to true enable '--autostash' option by default. +rebase.missingCommitsCheck:: + If set to "warn", print warnings about removed commits in + interactive mode. If set to "error", print the warnings and + stop the rebase. If set to "ignore", no checking is + done. "ignore" by default. + OPTIONS ------- --onto :: diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh index 2882276643..c26a200a6c 100644 --- a/git-rebase--interactive.sh +++ b/git-rebase--interactive.sh @@ -156,8 +156,17 @@ Commands: These lines can be re-ordered; they are executed from top to bottom. +EOF + if test $(get_missing_commit_check_level) = error + then + git stripspace --comment-lines >>"$todo" <<\EOF +Do not remove any line. Use 'drop' explicitly to remove a commit. +EOF + else + git stripspace --comment-lines >>"$todo" <<\EOF If you remove a line here THAT COMMIT WILL BE LOST. EOF + fi } make_patch () { @@ -837,6 +846,108 @@ add_exec_commands () { mv "$1.new" "$1" } +# Print the list of the SHA-1 of the commits +# from stdin to stdout +todo_list_to_sha_list () { + git stripspace --strip-comments | + while read -r command sha1 rest + do + case $command in + "$comment_char"*|''|noop|x|"exec") + ;; + *) + long_sha=$(git rev-list --no-walk "$sha1" 2>/dev/null) + printf "%s\n" "$long_sha" + ;; + esac + done +} + +# Use warn for each line in stdin +warn_lines () { + while read -r line + do + warn " - $line" + done +} + +# Switch to the branch in $into and notify it in the reflog +checkout_onto () { + GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name" + output git checkout $onto || die_abort "could not detach HEAD" + git update-ref ORIG_HEAD $orig_head +} + +get_missing_commit_check_level () { + check_level=$(git config --get rebase.missingCommitsCheck) + check_level=${check_level:-ignore} + # Don't be case sensitive + printf '%s' "$check_level" | tr 'A-Z' 'a-z' +} + +# Check if the user dropped some commits by mistake +# Behaviour determined by rebase.missingCommitsCheck. +check_todo_list () { + raise_error=f + + check_level=$(get_missing_commit_check_level) + + case "$check_level" in + warn|error) + # Get the SHA-1 of the commits + todo_list_to_sha_list <"$todo".backup >"$todo".oldsha1 + todo_list_to_sha_list <"$todo" >"$todo".newsha1 + + # Sort the SHA-1 and compare them + sort -u "$todo".oldsha1 >"$todo".oldsha1+ + mv "$todo".oldsha1+ "$todo".oldsha1 + sort -u "$todo".newsha1 >"$todo".newsha1+ + mv "$todo".newsha1+ "$todo".newsha1 + comm -2 -3 "$todo".oldsha1 "$todo".newsha1 >"$todo".miss + + # Warn about missing commits + if test -s "$todo".miss + then + test "$check_level" = error && raise_error=t + + warn "Warning: some commits may have been dropped" \ + "accidentally." + warn "Dropped commits (newer to older):" + + # Make the list user-friendly and display + opt="--no-walk=sorted --format=oneline --abbrev-commit --stdin" + git rev-list $opt <"$todo".miss | warn_lines + + warn "To avoid this message, use \"drop\" to" \ + "explicitly remove a commit." + warn + warn "Use 'git config rebase.missingCommitsCheck' to change" \ + "the level of warnings." + warn "The possible behaviours are: ignore, warn, error." + warn + fi + ;; + ignore) + ;; + *) + warn "Unrecognized setting $check_level for option" \ + "rebase.missingCommitsCheck. Ignoring." + ;; + esac + + if test $raise_error = t + then + # Checkout before the first commit of the + # rebase: this way git rebase --continue + # will work correctly as it expects HEAD to be + # placed before the commit of the next action + checkout_onto + + warn "You can fix this with 'git rebase --edit-todo'." + die "Or you can abort the rebase with 'git rebase --abort'." + fi +} + # The whole contents of this file is run by dot-sourcing it from # inside a shell function. It used to be that "return"s we see # below were not inside any function, and expected to return @@ -1077,13 +1188,13 @@ git_sequence_editor "$todo" || has_action "$todo" || return 2 +check_todo_list + expand_todo_ids test -d "$rewritten" || test -n "$force_rebase" || skip_unnecessary_picks -GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name" -output git checkout $onto || die_abort "could not detach HEAD" -git update-ref ORIG_HEAD $orig_head +checkout_onto do_rest } diff --git a/t/t3404-rebase-interactive.sh b/t/t3404-rebase-interactive.sh index 3d059e5c09..cfa741018d 100755 --- a/t/t3404-rebase-interactive.sh +++ b/t/t3404-rebase-interactive.sh @@ -1120,4 +1120,70 @@ test_expect_success 'drop' ' test A = $(git cat-file commit HEAD^^ | sed -ne \$p) ' +cat >expect <actual && + test D = $(git cat-file commit HEAD | sed -ne \$p) && + test_cmp expect actual +' + +cat >expect <actual && + test_cmp expect actual && + test D = $(git cat-file commit HEAD | sed -ne \$p) +' + +cat >expect <actual && + test_cmp expect actual && + cp .git/rebase-merge/git-rebase-todo.backup \ + .git/rebase-merge/git-rebase-todo && + FAKE_LINES="1 2 drop 3 4 drop 5" \ + git rebase --edit-todo && + git rebase --continue && + test D = $(git cat-file commit HEAD | sed -ne \$p) && + test B = $(git cat-file commit HEAD^ | sed -ne \$p) +' + test_done -- 2.11.4.GIT