diff options
| -rw-r--r-- | Documentation/git-cherry-pick.txt | 19 | ||||
| -rw-r--r-- | Documentation/git-rebase.txt | 4 | ||||
| -rw-r--r-- | builtin/revert.c | 8 | ||||
| -rw-r--r-- | git-rebase--am.sh | 19 | ||||
| -rw-r--r-- | git-rebase--interactive.sh | 35 | ||||
| -rwxr-xr-x | git-rebase.sh | 5 | ||||
| -rw-r--r-- | sequencer.c | 95 | ||||
| -rw-r--r-- | sequencer.h | 2 | ||||
| -rwxr-xr-x | t/t3505-cherry-pick-empty.sh | 25 |
9 files changed, 193 insertions, 19 deletions
diff --git a/Documentation/git-cherry-pick.txt b/Documentation/git-cherry-pick.txt index fed5097e00..3d25a20b67 100644 --- a/Documentation/git-cherry-pick.txt +++ b/Documentation/git-cherry-pick.txt @@ -103,6 +103,25 @@ effect to your index in a row. cherry-pick'ed commit, then a fast forward to this commit will be performed. +--allow-empty:: + By default, cherry-picking an empty commit will fail, + indicating that an explicit invocation of `git commit + --allow-empty` is required. This option overrides that + behavior, allowing empty commits to be preserved automatically + in a cherry-pick. Note that when "--ff" is in effect, empty + commits that meet the "fast-forward" requirement will be kept + even without this option. Note also, that use of this option only + keeps commits that were initially empty (i.e. the commit recorded the + same tree as its parent). Commits which are made empty due to a + previous commit are dropped. To force the inclusion of those commits + use `--keep-redundant-commits`. + +--keep-redundant-commits:: + If a commit being cherry picked duplicates a commit already in the + current history, it will become empty. By default these + redundant commits are ignored. This option overrides that behavior and + creates an empty commit object. Implies `--allow-empty`. + --strategy=<strategy>:: Use the given merge strategy. Should only be used once. See the MERGE STRATEGIES section in linkgit:git-merge[1] diff --git a/Documentation/git-rebase.txt b/Documentation/git-rebase.txt index 520aaa94fb..841ebd6a9f 100644 --- a/Documentation/git-rebase.txt +++ b/Documentation/git-rebase.txt @@ -238,6 +238,10 @@ leave out at most one of A and B, in which case it defaults to HEAD. will be reset to where it was when the rebase operation was started. +--keep-empty:: + Keep the commits that do not change anything from its + parents in the result. + --skip:: Restart the rebasing process by skipping the current patch. diff --git a/builtin/revert.c b/builtin/revert.c index 5462e676e2..82d1bf844b 100644 --- a/builtin/revert.c +++ b/builtin/revert.c @@ -115,12 +115,16 @@ static void parse_args(int argc, const char **argv, struct replay_opts *opts) OPT_END(), OPT_END(), OPT_END(), + OPT_END(), + OPT_END(), }; if (opts->action == REPLAY_PICK) { struct option cp_extra[] = { OPT_BOOLEAN('x', NULL, &opts->record_origin, "append commit name"), OPT_BOOLEAN(0, "ff", &opts->allow_ff, "allow fast-forward"), + OPT_BOOLEAN(0, "allow-empty", &opts->allow_empty, "preserve initially empty commits"), + OPT_BOOLEAN(0, "keep-redundant-commits", &opts->keep_redundant_commits, "keep redundant, empty commits"), OPT_END(), }; if (parse_options_concat(options, ARRAY_SIZE(options), cp_extra)) @@ -138,6 +142,10 @@ static void parse_args(int argc, const char **argv, struct replay_opts *opts) "--abort", rollback, NULL); + /* implies allow_empty */ + if (opts->keep_redundant_commits) + opts->allow_empty = 1; + /* Set the subcommand */ if (remove_state) opts->subcommand = REPLAY_REMOVE_STATE; diff --git a/git-rebase--am.sh b/git-rebase--am.sh index c815a2412c..04d89415fe 100644 --- a/git-rebase--am.sh +++ b/git-rebase--am.sh @@ -20,11 +20,20 @@ esac test -n "$rebase_root" && root_flag=--root -git format-patch -k --stdout --full-index --ignore-if-in-upstream \ - --src-prefix=a/ --dst-prefix=b/ \ - --no-renames $root_flag "$revisions" | -git am $git_am_opt --rebasing --resolvemsg="$resolvemsg" && -move_to_original_branch +if test -n "$keep_empty" +then + # we have to do this the hard way. git format-patch completely squashes + # empty commits and even if it didn't the format doesn't really lend + # itself well to recording empty patches. fortunately, cherry-pick + # makes this easy + git cherry-pick --allow-empty "$revisions" +else + git format-patch -k --stdout --full-index --ignore-if-in-upstream \ + --src-prefix=a/ --dst-prefix=b/ \ + --no-renames $root_flag "$revisions" | + git am $git_am_opt --rebasing --resolvemsg="$resolvemsg" +fi && move_to_original_branch + ret=$? test 0 != $ret -a -d "$state_dir" && write_basic_state exit $ret diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh index 2e1325824c..0c19b7c753 100644 --- a/git-rebase--interactive.sh +++ b/git-rebase--interactive.sh @@ -167,6 +167,14 @@ has_action () { sane_grep '^[^#]' "$1" >/dev/null } +is_empty_commit() { + tree=$(git rev-parse -q --verify "$1"^{tree} 2>/dev/null || + die "$1: not a commit that can be picked") + ptree=$(git rev-parse -q --verify "$1"^^{tree} 2>/dev/null || + ptree=4b825dc642cb6eb9a060e54bf8d69288fbee4904) + test "$tree" = "$ptree" +} + # Run command with GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and # GIT_AUTHOR_DATE exported from the current environment. do_with_author () { @@ -191,12 +199,19 @@ git_sequence_editor () { pick_one () { ff=--ff + case "$1" in -n) sha1=$2; ff= ;; *) sha1=$1 ;; esac case "$force_rebase" in '') ;; ?*) ff= ;; esac output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1" + + if is_empty_commit "$sha1" + then + empty_args="--allow-empty" + fi + test -d "$rewritten" && pick_one_preserving_merges "$@" && return - output git cherry-pick $ff "$@" + output git cherry-pick $empty_args $ff "$@" } pick_one_preserving_merges () { @@ -780,9 +795,17 @@ git rev-list $merges_option --pretty=oneline --abbrev-commit \ sed -n "s/^>//p" | while read -r shortsha1 rest do + + if test -z "$keep_empty" && is_empty_commit $shortsha1 + then + comment_out="# " + else + comment_out= + fi + if test t != "$preserve_merges" then - printf '%s\n' "pick $shortsha1 $rest" >> "$todo" + printf '%s\n' "${comment_out}pick $shortsha1 $rest" >>"$todo" else sha1=$(git rev-parse $shortsha1) if test -z "$rebase_root" @@ -801,7 +824,7 @@ do if test f = "$preserve" then touch "$rewritten"/$sha1 - printf '%s\n' "pick $shortsha1 $rest" >> "$todo" + printf '%s\n' "${comment_out}pick $shortsha1 $rest" >>"$todo" fi fi done @@ -853,6 +876,12 @@ cat >> "$todo" << EOF # EOF +if test -z "$keep_empty" +then + echo "# Note that empty commits are commented out" >>"$todo" +fi + + has_action "$todo" || die_abort "Nothing to do" diff --git a/git-rebase.sh b/git-rebase.sh index 69c1374823..24a2840033 100755 --- a/git-rebase.sh +++ b/git-rebase.sh @@ -43,6 +43,7 @@ s,strategy=! use the given merge strategy no-ff! cherry-pick all commits, even if unchanged m,merge! use merging strategies to rebase i,interactive! let the user edit the list of commits to rebase +k,keep-empty preserve empty commits during rebase f,force-rebase! force rebase even if branch is up to date X,strategy-option=! pass the argument through to the merge strategy stat! display a diffstat of what changed upstream @@ -97,6 +98,7 @@ state_dir= action= preserve_merges= autosquash= +keep_empty= test "$(git config --bool rebase.autosquash)" = "true" && autosquash=t read_basic_state () { @@ -220,6 +222,9 @@ do -i) interactive_rebase=explicit ;; + -k) + keep_empty=yes + ;; -p) preserve_merges=t test -z "$interactive_rebase" && interactive_rebase=implied diff --git a/sequencer.c b/sequencer.c index 81d8ace35f..f83cdfd637 100644 --- a/sequencer.c +++ b/sequencer.c @@ -13,6 +13,7 @@ #include "rerere.h" #include "merge-recursive.h" #include "refs.h" +#include "argv-array.h" #define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION" @@ -251,6 +252,30 @@ static int do_recursive_merge(struct commit *base, struct commit *next, return !clean; } +static int is_index_unchanged(void) +{ + unsigned char head_sha1[20]; + struct commit *head_commit; + + if (!resolve_ref_unsafe("HEAD", head_sha1, 1, NULL)) + return error(_("Could not resolve HEAD commit\n")); + + head_commit = lookup_commit(head_sha1); + if (!head_commit || parse_commit(head_commit)) + return error(_("could not parse commit %s\n"), + sha1_to_hex(head_commit->object.sha1)); + + if (!active_cache_tree) + active_cache_tree = cache_tree(); + + if (!cache_tree_fully_valid(active_cache_tree)) + if (cache_tree_update(active_cache_tree, active_cache, + active_nr, 0)) + return error(_("Unable to update cache tree\n")); + + return !hashcmp(active_cache_tree->sha1, head_commit->tree->object.sha1); +} + /* * If we are cherry-pick, and if the merge did not result in * hand-editing, we will hit this commit and inherit the original @@ -260,21 +285,46 @@ static int do_recursive_merge(struct commit *base, struct commit *next, */ static int run_git_commit(const char *defmsg, struct replay_opts *opts) { - /* 6 is max possible length of our args array including NULL */ - const char *args[6]; - int i = 0; + struct argv_array array; + int rc; + + argv_array_init(&array); + argv_array_push(&array, "commit"); + argv_array_push(&array, "-n"); - args[i++] = "commit"; - args[i++] = "-n"; if (opts->signoff) - args[i++] = "-s"; + argv_array_push(&array, "-s"); if (!opts->edit) { - args[i++] = "-F"; - args[i++] = defmsg; + argv_array_push(&array, "-F"); + argv_array_push(&array, defmsg); + } + + if (opts->allow_empty) + argv_array_push(&array, "--allow-empty"); + + rc = run_command_v_opt(array.argv, RUN_GIT_CMD); + argv_array_clear(&array); + return rc; +} + +static int is_original_commit_empty(struct commit *commit) +{ + const unsigned char *ptree_sha1; + + if (parse_commit(commit)) + return error(_("Could not parse commit %s\n"), + sha1_to_hex(commit->object.sha1)); + if (commit->parents) { + struct commit *parent = commit->parents->item; + if (parse_commit(parent)) + return error(_("Could not parse parent commit %s\n"), + sha1_to_hex(parent->object.sha1)); + ptree_sha1 = parent->tree->object.sha1; + } else { + ptree_sha1 = EMPTY_TREE_SHA1_BIN; /* commit is root */ } - args[i] = NULL; - return run_command_v_opt(args, RUN_GIT_CMD); + return !hashcmp(ptree_sha1, commit->tree->object.sha1); } static int do_pick_commit(struct commit *commit, struct replay_opts *opts) @@ -286,6 +336,8 @@ static int do_pick_commit(struct commit *commit, struct replay_opts *opts) char *defmsg = NULL; struct strbuf msgbuf = STRBUF_INIT; int res; + int empty_commit; + int index_unchanged; if (opts->no_commit) { /* @@ -411,6 +463,10 @@ static int do_pick_commit(struct commit *commit, struct replay_opts *opts) free_commit_list(remotes); } + empty_commit = is_original_commit_empty(commit); + if (empty_commit < 0) + return empty_commit; + /* * If the merge was clean or if it failed due to conflict, we write * CHERRY_PICK_HEAD for the subsequent invocation of commit to use. @@ -431,6 +487,25 @@ static int do_pick_commit(struct commit *commit, struct replay_opts *opts) print_advice(res == 1, opts); rerere(opts->allow_rerere_auto); } else { + index_unchanged = is_index_unchanged(); + /* + * If index_unchanged is less than 0, that indicates we either + * couldn't parse HEAD or the index, so error out here. + */ + if (index_unchanged < 0) + return index_unchanged; + + if (!empty_commit && !opts->keep_redundant_commits && index_unchanged) + /* + * The head tree and the index match + * meaning the commit is empty. Since it wasn't created + * empty (based on the previous test), we can conclude + * the commit has been made redundant. Since we don't + * want to keep redundant commits, we can just return + * here, skipping this commit + */ + return 0; + if (!opts->no_commit) res = run_git_commit(defmsg, opts); } diff --git a/sequencer.h b/sequencer.h index bb4b13830e..aa5f17cc30 100644 --- a/sequencer.h +++ b/sequencer.h @@ -29,6 +29,8 @@ struct replay_opts { int signoff; int allow_ff; int allow_rerere_auto; + int allow_empty; + int keep_redundant_commits; int mainline; diff --git a/t/t3505-cherry-pick-empty.sh b/t/t3505-cherry-pick-empty.sh index c10b28cf57..92f00cdf84 100755 --- a/t/t3505-cherry-pick-empty.sh +++ b/t/t3505-cherry-pick-empty.sh @@ -18,7 +18,12 @@ test_expect_success setup ' echo third >> file1 && git add file1 && test_tick && - git commit --allow-empty-message -m "" + git commit --allow-empty-message -m "" && + + git checkout master && + git checkout -b empty-branch2 && + test_tick && + git commit --allow-empty -m "empty" ' @@ -48,4 +53,22 @@ test_expect_success 'index lockfile was removed' ' ' +test_expect_success 'cherry pick an empty non-ff commit without --allow-empty' ' + git checkout master && + echo fourth >>file2 && + git add file2 && + git commit -m "fourth" && + test_must_fail git cherry-pick empty-branch2 +' + +test_expect_success 'cherry pick an empty non-ff commit with --allow-empty' ' + git checkout master && + git cherry-pick --allow-empty empty-branch2 +' + +test_expect_success 'cherry pick with --keep-redundant-commits' ' + git checkout master && + git cherry-pick --keep-redundant-commits HEAD^ +' + test_done |