revert: Introduce --reset to remove sequencer state

To explicitly remove the sequencer state for a fresh cherry-pick or
revert invocation, introduce a new subcommand called "--reset" to
remove the sequencer state.

Take the opportunity to publicly expose the sequencer paths, and a
generic function called "remove_sequencer_state" that various git
programs can use to remove the sequencer state in a uniform manner;
"git reset" uses it later in this series.  Introducing this public API
is also in line with our long-term goal of eventually factoring out
functions from revert.c into a generic commit sequencer.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/git-cherry-pick.txt b/Documentation/git-cherry-pick.txt
index 9d8fe0d26145ae45f566d3e8d4253c396630b41f..138a29284953e19884d05be424f9059a5a247936 100644 (file)
--- a/Documentation/git-cherry-pick.txt
+++ b/Documentation/git-cherry-pick.txt
@@ -8,6 +8,7 @@ git-cherry-pick - Apply the changes introduced by some existing commits
 SYNOPSIS
 --------
 'git cherry-pick' [--edit] [-n] [-m parent-number] [-s] [-x] [--ff] <commit>...
+'git cherry-pick' --reset
 
 DESCRIPTION
 -----------
@@ -109,6 +110,10 @@ effect to your index in a row.
        Pass the merge strategy-specific option through to the
        merge strategy.  See linkgit:git-merge[1] for details.
 
+SEQUENCER SUBCOMMANDS
+---------------------
+include::sequencer.txt[]
+
 EXAMPLES
 --------
 git cherry-pick master::

diff --git a/Documentation/git-revert.txt b/Documentation/git-revert.txt
index ac10cfbb14aba460973019d712ee90e8804de34d..783ffb4a68f757c42e5f546f73b25f6d270dc426 100644 (file)
--- a/Documentation/git-revert.txt
+++ b/Documentation/git-revert.txt
@@ -8,6 +8,7 @@ git-revert - Revert some existing commits
 SYNOPSIS
 --------
 'git revert' [--edit | --no-edit] [-n] [-m parent-number] [-s] <commit>...
+'git revert' --reset
 
 DESCRIPTION
 -----------
@@ -90,6 +91,10 @@ effect to your index in a row.
        Pass the merge strategy-specific option through to the
        merge strategy.  See linkgit:git-merge[1] for details.
 
+SEQUENCER SUBCOMMANDS
+---------------------
+include::sequencer.txt[]
+
 EXAMPLES
 --------
 git revert HEAD~3::

diff --git a/Documentation/sequencer.txt b/Documentation/sequencer.txt
new file mode 100644 (file)
index 0000000..16ce88c
--- /dev/null
+++ b/Documentation/sequencer.txt
@@ -0,0 +1,4 @@
+--reset::
+       Forget about the current operation in progress.  Can be used
+       to clear the sequencer state after a failed cherry-pick or
+       revert.

diff --git a/Makefile b/Makefile
index e40ac0c7f5ec2f304b88d92f47ff94272f5ce2a4..f69eef254cbd28c7450d1617a2b3b5286fe39565 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -551,6 +551,7 @@ LIB_H += rerere.h
 LIB_H += resolve-undo.h
 LIB_H += revision.h
 LIB_H += run-command.h
+LIB_H += sequencer.h
 LIB_H += sha1-array.h
 LIB_H += sha1-lookup.h
 LIB_H += sideband.h
@@ -654,6 +655,7 @@ LIB_OBJS += revision.o
 LIB_OBJS += run-command.o
 LIB_OBJS += server-info.o
 LIB_OBJS += setup.o
+LIB_OBJS += sequencer.o
 LIB_OBJS += sha1-array.o
 LIB_OBJS += sha1-lookup.o
 LIB_OBJS += sha1_file.o

diff --git a/builtin/revert.c b/builtin/revert.c
index f088e1cc7123442485c5e64d7e3c17aa46332a13..a8accd6c7a1964e9e1dc233ad2bfb574286c705e 100644 (file)
--- a/builtin/revert.c
+++ b/builtin/revert.c
@@ -14,6 +14,7 @@
 #include "merge-recursive.h"
 #include "refs.h"
 #include "dir.h"
+#include "sequencer.h"
 
 /*
  * This implements the builtins revert and cherry-pick.
@@ -28,18 +29,22 @@
 
 static const char * const revert_usage[] = {
        "git revert [options] <commit-ish>",
+       "git revert <subcommand>",
        NULL
 };
 
 static const char * const cherry_pick_usage[] = {
        "git cherry-pick [options] <commit-ish>",
+       "git cherry-pick <subcommand>",
        NULL
 };
 
 enum replay_action { REVERT, CHERRY_PICK };
+enum replay_subcommand { REPLAY_NONE, REPLAY_RESET };
 
 struct replay_opts {
        enum replay_action action;
+       enum replay_subcommand subcommand;
 
        /* Boolean options */
        int edit;
@@ -61,11 +66,6 @@ struct replay_opts {
 
 #define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION"
 
-#define SEQ_DIR         "sequencer"
-#define SEQ_HEAD_FILE   "sequencer/head"
-#define SEQ_TODO_FILE   "sequencer/todo"
-#define SEQ_OPTS_FILE   "sequencer/opts"
-
 static const char *action_name(const struct replay_opts *opts)
 {
        return opts->action == REVERT ? "revert" : "cherry-pick";
@@ -113,7 +113,9 @@ static void parse_args(int argc, const char **argv, struct replay_opts *opts)
        const char * const * usage_str = revert_or_cherry_pick_usage(opts);
        const char *me = action_name(opts);
        int noop;
+       int reset = 0;
        struct option options[] = {
+               OPT_BOOLEAN(0, "reset", &reset, "forget the current operation"),
                OPT_BOOLEAN('n', "no-commit", &opts->no_commit, "don't automatically commit"),
                OPT_BOOLEAN('e', "edit", &opts->edit, "edit the commit message"),
                { OPTION_BOOLEAN, 'r', NULL, &noop, NULL, "no-op (backward compatibility)",
@@ -142,7 +144,27 @@ static void parse_args(int argc, const char **argv, struct replay_opts *opts)
        opts->commit_argc = parse_options(argc, argv, NULL, options, usage_str,
                                        PARSE_OPT_KEEP_ARGV0 |
                                        PARSE_OPT_KEEP_UNKNOWN);
-       if (opts->commit_argc < 2)
+
+       /* Set the subcommand */
+       if (reset)
+               opts->subcommand = REPLAY_RESET;
+       else
+               opts->subcommand = REPLAY_NONE;
+
+       /* Check for incompatible command line arguments */
+       if (opts->subcommand == REPLAY_RESET) {
+               verify_opt_compatible(me, "--reset",
+                               "--no-commit", opts->no_commit,
+                               "--signoff", opts->signoff,
+                               "--mainline", opts->mainline,
+                               "--strategy", opts->strategy ? 1 : 0,
+                               "--strategy-option", opts->xopts ? 1 : 0,
+                               "-x", opts->record_origin,
+                               "--ff", opts->allow_ff,
+                               NULL);
+       }
+
+       else if (opts->commit_argc < 2)
                usage_with_options(usage_str, options);
 
        if (opts->allow_ff)
@@ -729,7 +751,6 @@ static void save_opts(struct replay_opts *opts)
 
 static int pick_commits(struct commit_list *todo_list, struct replay_opts *opts)
 {
-       struct strbuf buf = STRBUF_INIT;
        struct commit_list *cur;
        int res;
 
@@ -750,9 +771,7 @@ static int pick_commits(struct commit_list *todo_list, struct replay_opts *opts)
         * Sequence of picks finished successfully; cleanup by
         * removing the .git/sequencer directory
         */
-       strbuf_addf(&buf, "%s", git_path(SEQ_DIR));
-       remove_dir_recursively(&buf, 0);
-       strbuf_release(&buf);
+       remove_sequencer_state(1);
        return 0;
 }
 
@@ -768,16 +787,21 @@ static int pick_revisions(struct replay_opts *opts)
         * cherry-pick should be handled differently from an existing
         * one that is being continued
         */
-       walk_revs_populate_todo(&todo_list, opts);
-       create_seq_dir();
-       if (get_sha1("HEAD", sha1)) {
-               if (opts->action == REVERT)
-                       die(_("Can't revert as initial commit"));
-               die(_("Can't cherry-pick into empty head"));
+       if (opts->subcommand == REPLAY_RESET) {
+               remove_sequencer_state(1);
+               return 0;
+       } else {
+               /* Start a new cherry-pick/ revert sequence */
+               walk_revs_populate_todo(&todo_list, opts);
+               create_seq_dir();
+               if (get_sha1("HEAD", sha1)) {
+                       if (opts->action == REVERT)
+                               die(_("Can't revert as initial commit"));
+                       die(_("Can't cherry-pick into empty head"));
+               }
+               save_head(sha1_to_hex(sha1));
+               save_opts(opts);
        }
-       save_head(sha1_to_hex(sha1));
-       save_opts(opts);
-
        return pick_commits(todo_list, opts);
 }
 

diff --git a/sequencer.c b/sequencer.c
new file mode 100644 (file)
index 0000000..bc2c046
--- /dev/null
+++ b/sequencer.c
@@ -0,0 +1,19 @@
+#include "cache.h"
+#include "sequencer.h"
+#include "strbuf.h"
+#include "dir.h"
+
+void remove_sequencer_state(int aggressive)
+{
+       struct strbuf seq_dir = STRBUF_INIT;
+       struct strbuf seq_old_dir = STRBUF_INIT;
+
+       strbuf_addf(&seq_dir, "%s", git_path(SEQ_DIR));
+       strbuf_addf(&seq_old_dir, "%s", git_path(SEQ_OLD_DIR));
+       remove_dir_recursively(&seq_old_dir, 0);
+       rename(git_path(SEQ_DIR), git_path(SEQ_OLD_DIR));
+       if (aggressive)
+               remove_dir_recursively(&seq_old_dir, 0);
+       strbuf_release(&seq_dir);
+       strbuf_release(&seq_old_dir);
+}

diff --git a/sequencer.h b/sequencer.h
new file mode 100644 (file)
index 0000000..905d295
--- /dev/null
+++ b/sequencer.h
@@ -0,0 +1,20 @@
+#ifndef SEQUENCER_H
+#define SEQUENCER_H
+
+#define SEQ_DIR                "sequencer"
+#define SEQ_OLD_DIR    "sequencer-old"
+#define SEQ_HEAD_FILE  "sequencer/head"
+#define SEQ_TODO_FILE  "sequencer/todo"
+#define SEQ_OPTS_FILE  "sequencer/opts"
+
+/*
+ * Removes SEQ_OLD_DIR and renames SEQ_DIR to SEQ_OLD_DIR, ignoring
+ * any errors.  Intended to be used by 'git reset'.
+ *
+ * With the aggressive flag, it additionally removes SEQ_OLD_DIR,
+ * ignoring any errors.  Inteded to be used by the sequencer's
+ * '--reset' subcommand.
+ */
+void remove_sequencer_state(int aggressive);
+
+#endif

diff --git a/t/t3510-cherry-pick-sequence.sh b/t/t3510-cherry-pick-sequence.sh
index 8ee000180a3a65da0a1e4e5ba6e63e5155a9fe9a..fd6986541a71b4ea133333e2fd1f43cc2bd85997 100755 (executable)
--- a/t/t3510-cherry-pick-sequence.sh
+++ b/t/t3510-cherry-pick-sequence.sh
@@ -13,7 +13,7 @@ test_description='Test cherry-pick continuation features
 . ./test-lib.sh
 
 pristine_detach () {
-       rm -rf .git/sequencer &&
+       git cherry-pick --reset &&
        git checkout -f "$1^0" &&
        git read-tree -u --reset HEAD &&
        git clean -d -f -f -q -x
@@ -70,4 +70,16 @@ test_expect_success 'cherry-pick cleans up sequencer state upon success' '
        test_path_is_missing .git/sequencer
 '
 
+test_expect_success '--reset does not complain when no cherry-pick is in progress' '
+       pristine_detach initial &&
+       git cherry-pick --reset
+'
+
+test_expect_success '--reset cleans up sequencer state' '
+       pristine_detach initial &&
+       test_must_fail git cherry-pick base..picked &&
+       git cherry-pick --reset &&
+       test_path_is_missing .git/sequencer
+'
+
 test_done