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-rw-r--r--builtin-revert.c90
1 files changed, 50 insertions, 40 deletions
diff --git a/builtin-revert.c b/builtin-revert.c
index 74845ef8e6..d48313c745 100644
--- a/builtin-revert.c
+++ b/builtin-revert.c
@@ -11,6 +11,8 @@
#include "cache-tree.h"
#include "diff.h"
#include "revision.h"
+#include "rerere.h"
+#include "merge-recursive.h"
/*
* This implements the builtins revert and cherry-pick.
@@ -200,36 +202,6 @@ static void set_author_ident_env(const char *message)
sha1_to_hex(commit->object.sha1));
}
-static int merge_recursive(const char *base_sha1,
- const char *head_sha1, const char *head_name,
- const char *next_sha1, const char *next_name)
-{
- char buffer[256];
- const char *argv[6];
- int i = 0;
-
- sprintf(buffer, "GITHEAD_%s", head_sha1);
- setenv(buffer, head_name, 1);
- sprintf(buffer, "GITHEAD_%s", next_sha1);
- setenv(buffer, next_name, 1);
-
- /*
- * This three way merge is an interesting one. We are at
- * $head, and would want to apply the change between $commit
- * and $prev on top of us (when reverting), or the change between
- * $prev and $commit on top of us (when cherry-picking or replaying).
- */
- argv[i++] = "merge-recursive";
- if (base_sha1)
- argv[i++] = base_sha1;
- argv[i++] = "--";
- argv[i++] = head_sha1;
- argv[i++] = next_sha1;
- argv[i++] = NULL;
-
- return run_command_v_opt(argv, RUN_COMMAND_NO_STDIN | RUN_GIT_CMD);
-}
-
static char *help_msg(const unsigned char *sha1)
{
static char helpbuf[1024];
@@ -262,14 +234,27 @@ static int index_is_dirty(void)
return !!DIFF_OPT_TST(&rev.diffopt, HAS_CHANGES);
}
+static struct tree *empty_tree(void)
+{
+ struct tree *tree = xcalloc(1, sizeof(struct tree));
+
+ tree->object.parsed = 1;
+ tree->object.type = OBJ_TREE;
+ pretend_sha1_file(NULL, 0, OBJ_TREE, tree->object.sha1);
+ return tree;
+}
+
static int revert_or_cherry_pick(int argc, const char **argv)
{
unsigned char head[20];
struct commit *base, *next, *parent;
- int i;
+ int i, index_fd, clean;
char *oneline, *reencoded_message = NULL;
const char *message, *encoding;
char *defmsg = git_pathdup("MERGE_MSG");
+ struct merge_options o;
+ struct tree *result, *next_tree, *base_tree, *head_tree;
+ static struct lock_file index_lock;
git_config(git_default_config, NULL);
me = action == REVERT ? "revert" : "cherry-pick";
@@ -280,6 +265,8 @@ static int revert_or_cherry_pick(int argc, const char **argv)
if (action == REVERT && !no_replay)
die("revert is incompatible with replay");
+ if (read_cache() < 0)
+ die("git %s: failed to read the index", me);
if (no_commit) {
/*
* We do not intend to commit immediately. We just want to
@@ -292,12 +279,12 @@ static int revert_or_cherry_pick(int argc, const char **argv)
} else {
if (get_sha1("HEAD", head))
die ("You do not have a valid HEAD");
- if (read_cache() < 0)
- die("could not read the index");
if (index_is_dirty())
die ("Dirty index: cannot %s", me);
- discard_cache();
}
+ discard_cache();
+
+ index_fd = hold_locked_index(&index_lock, 1);
if (!commit->parents) {
if (action == REVERT)
@@ -331,6 +318,10 @@ static int revert_or_cherry_pick(int argc, const char **argv)
die ("Cannot get commit message for %s",
sha1_to_hex(commit->object.sha1));
+ if (parent && parse_commit(parent) < 0)
+ die("%s: cannot parse parent commit %s",
+ me, sha1_to_hex(parent->object.sha1));
+
/*
* "commit" is an existing commit. We would want to apply
* the difference it introduces since its first parent "prev"
@@ -361,6 +352,11 @@ static int revert_or_cherry_pick(int argc, const char **argv)
add_to_msg(oneline_body + 1);
add_to_msg("\"\n\nThis reverts commit ");
add_to_msg(sha1_to_hex(commit->object.sha1));
+
+ if (commit->parents->next) {
+ add_to_msg(", reversing\nchanges made to ");
+ add_to_msg(sha1_to_hex(parent->object.sha1));
+ }
add_to_msg(".\n");
} else {
base = parent;
@@ -374,13 +370,26 @@ static int revert_or_cherry_pick(int argc, const char **argv)
}
}
- if (merge_recursive(base == NULL ?
- NULL : sha1_to_hex(base->object.sha1),
- sha1_to_hex(head), "HEAD",
- sha1_to_hex(next->object.sha1), oneline) ||
- write_cache_as_tree(head, 0, NULL)) {
+ read_cache();
+ init_merge_options(&o);
+ o.branch1 = "HEAD";
+ o.branch2 = oneline;
+
+ head_tree = parse_tree_indirect(head);
+ next_tree = next ? next->tree : empty_tree();
+ base_tree = base ? base->tree : empty_tree();
+
+ clean = merge_trees(&o,
+ head_tree,
+ next_tree, base_tree, &result);
+
+ if (active_cache_changed &&
+ (write_cache(index_fd, active_cache, active_nr) ||
+ commit_locked_index(&index_lock)))
+ die("%s: Unable to write new index file", me);
+
+ if (!clean) {
add_to_msg("\nConflicts:\n\n");
- read_cache();
for (i = 0; i < active_nr;) {
struct cache_entry *ce = active_cache[i++];
if (ce_stage(ce)) {
@@ -396,6 +405,7 @@ static int revert_or_cherry_pick(int argc, const char **argv)
die ("Error wrapping up %s", defmsg);
fprintf(stderr, "Automatic %s failed.%s\n",
me, help_msg(commit->object.sha1));
+ rerere();
exit(1);
}
if (commit_lock_file(&msg_file) < 0)