diff options
Diffstat (limited to 'builtin-revert.c')
| -rw-r--r-- | builtin-revert.c | 91 |
1 files changed, 51 insertions, 40 deletions
diff --git a/builtin-revert.c b/builtin-revert.c index 74845ef8e6..09d08fa3e3 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 +370,27 @@ 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); + rollback_lock_file(&index_lock); + + 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 +406,7 @@ 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) |