Squashed 'third_party/git/' content from commit cb71568594

git-subtree-dir: third_party/git
git-subtree-split: cb715685942260375e1eb8153b0768a376e4ece7

notes-utils.c

@@ -0,0 +1,186 @@
+#include "cache.h"
+#include "config.h"
+#include "commit.h"
+#include "refs.h"
+#include "notes-utils.h"
+#include "repository.h"
+
+void create_notes_commit(struct repository *r,
+			 struct notes_tree *t,
+			 struct commit_list *parents,
+			 const char *msg, size_t msg_len,
+			 struct object_id *result_oid)
+{
+	struct object_id tree_oid;
+
+	assert(t->initialized);
+
+	if (write_notes_tree(t, &tree_oid))
+		die("Failed to write notes tree to database");
+
+	if (!parents) {
+		/* Deduce parent commit from t->ref */
+		struct object_id parent_oid;
+		if (!read_ref(t->ref, &parent_oid)) {
+			struct commit *parent = lookup_commit(r, &parent_oid);
+			if (parse_commit(parent))
+				die("Failed to find/parse commit %s", t->ref);
+			commit_list_insert(parent, &parents);
+		}
+		/* else: t->ref points to nothing, assume root/orphan commit */
+	}
+
+	if (commit_tree(msg, msg_len, &tree_oid, parents, result_oid, NULL,
+			NULL))
+		die("Failed to commit notes tree to database");
+}
+
+void commit_notes(struct repository *r, struct notes_tree *t, const char *msg)
+{
+	struct strbuf buf = STRBUF_INIT;
+	struct object_id commit_oid;
+
+	if (!t)
+		t = &default_notes_tree;
+	if (!t->initialized || !t->update_ref || !*t->update_ref)
+		die(_("Cannot commit uninitialized/unreferenced notes tree"));
+	if (!t->dirty)
+		return; /* don't have to commit an unchanged tree */
+
+	/* Prepare commit message and reflog message */
+	strbuf_addstr(&buf, msg);
+	strbuf_complete_line(&buf);
+
+	create_notes_commit(r, t, NULL, buf.buf, buf.len, &commit_oid);
+	strbuf_insert(&buf, 0, "notes: ", 7); /* commit message starts at index 7 */
+	update_ref(buf.buf, t->update_ref, &commit_oid, NULL, 0,
+		   UPDATE_REFS_DIE_ON_ERR);
+
+	strbuf_release(&buf);
+}
+
+int parse_notes_merge_strategy(const char *v, enum notes_merge_strategy *s)
+{
+	if (!strcmp(v, "manual"))
+		*s = NOTES_MERGE_RESOLVE_MANUAL;
+	else if (!strcmp(v, "ours"))
+		*s = NOTES_MERGE_RESOLVE_OURS;
+	else if (!strcmp(v, "theirs"))
+		*s = NOTES_MERGE_RESOLVE_THEIRS;
+	else if (!strcmp(v, "union"))
+		*s = NOTES_MERGE_RESOLVE_UNION;
+	else if (!strcmp(v, "cat_sort_uniq"))
+		*s = NOTES_MERGE_RESOLVE_CAT_SORT_UNIQ;
+	else
+		return -1;
+
+	return 0;
+}
+
+static combine_notes_fn parse_combine_notes_fn(const char *v)
+{
+	if (!strcasecmp(v, "overwrite"))
+		return combine_notes_overwrite;
+	else if (!strcasecmp(v, "ignore"))
+		return combine_notes_ignore;
+	else if (!strcasecmp(v, "concatenate"))
+		return combine_notes_concatenate;
+	else if (!strcasecmp(v, "cat_sort_uniq"))
+		return combine_notes_cat_sort_uniq;
+	else
+		return NULL;
+}
+
+static int notes_rewrite_config(const char *k, const char *v, void *cb)
+{
+	struct notes_rewrite_cfg *c = cb;
+	if (starts_with(k, "notes.rewrite.") && !strcmp(k+14, c->cmd)) {
+		c->enabled = git_config_bool(k, v);
+		return 0;
+	} else if (!c->mode_from_env && !strcmp(k, "notes.rewritemode")) {
+		if (!v)
+			return config_error_nonbool(k);
+		c->combine = parse_combine_notes_fn(v);
+		if (!c->combine) {
+			error(_("Bad notes.rewriteMode value: '%s'"), v);
+			return 1;
+		}
+		return 0;
+	} else if (!c->refs_from_env && !strcmp(k, "notes.rewriteref")) {
+		/* note that a refs/ prefix is implied in the
+		 * underlying for_each_glob_ref */
+		if (starts_with(v, "refs/notes/"))
+			string_list_add_refs_by_glob(c->refs, v);
+		else
+			warning(_("Refusing to rewrite notes in %s"
+				" (outside of refs/notes/)"), v);
+		return 0;
+	}
+
+	return 0;
+}
+
+
+struct notes_rewrite_cfg *init_copy_notes_for_rewrite(const char *cmd)
+{
+	struct notes_rewrite_cfg *c = xmalloc(sizeof(struct notes_rewrite_cfg));
+	const char *rewrite_mode_env = getenv(GIT_NOTES_REWRITE_MODE_ENVIRONMENT);
+	const char *rewrite_refs_env = getenv(GIT_NOTES_REWRITE_REF_ENVIRONMENT);
+	c->cmd = cmd;
+	c->enabled = 1;
+	c->combine = combine_notes_concatenate;
+	c->refs = xcalloc(1, sizeof(struct string_list));
+	c->refs->strdup_strings = 1;
+	c->refs_from_env = 0;
+	c->mode_from_env = 0;
+	if (rewrite_mode_env) {
+		c->mode_from_env = 1;
+		c->combine = parse_combine_notes_fn(rewrite_mode_env);
+		if (!c->combine)
+			/*
+			 * TRANSLATORS: The first %s is the name of
+			 * the environment variable, the second %s is
+			 * its value.
+			 */
+			error(_("Bad %s value: '%s'"), GIT_NOTES_REWRITE_MODE_ENVIRONMENT,
+					rewrite_mode_env);
+	}
+	if (rewrite_refs_env) {
+		c->refs_from_env = 1;
+		string_list_add_refs_from_colon_sep(c->refs, rewrite_refs_env);
+	}
+	git_config(notes_rewrite_config, c);
+	if (!c->enabled || !c->refs->nr) {
+		string_list_clear(c->refs, 0);
+		free(c->refs);
+		free(c);
+		return NULL;
+	}
+	c->trees = load_notes_trees(c->refs, NOTES_INIT_WRITABLE);
+	string_list_clear(c->refs, 0);
+	free(c->refs);
+	return c;
+}
+
+int copy_note_for_rewrite(struct notes_rewrite_cfg *c,
+			  const struct object_id *from_obj, const struct object_id *to_obj)
+{
+	int ret = 0;
+	int i;
+	for (i = 0; c->trees[i]; i++)
+		ret = copy_note(c->trees[i], from_obj, to_obj, 1, c->combine) || ret;
+	return ret;
+}
+
+void finish_copy_notes_for_rewrite(struct repository *r,
+				   struct notes_rewrite_cfg *c,
+				   const char *msg)
+{
+	int i;
+	for (i = 0; c->trees[i]; i++) {
+		commit_notes(r, c->trees[i], msg);
+		free_notes(c->trees[i]);
+	}
+	free(c->trees);
+	free(c);
+}