revert(3p/git): Revert merge of git upstream at v2.26.2 r/852

This causes cgit to serve error pages, which is undesirable.

This reverts commit 5229c9b232de5bfa959ad6ebbb4c8192ac513352, reversing
changes made to f2b211131f2347342dde63975b09cf603149f1a3.

1 files changed, 20 insertions, 122 deletions

diff --git a/third_party/git/fast-import.c b/third_party/git/fast-import.c
index b8b65a801cc1..b44d6a467ef1 100644
--- a/third_party/git/fast-import.c
+++ b/third_party/git/fast-import.c
@@ -217,7 +217,6 @@ static uintmax_t next_mark;
 static struct strbuf new_data = STRBUF_INIT;
 static int seen_data_command;
 static int require_explicit_termination;
-static int allow_unsafe_features;
 
 /* Signal handling */
 static volatile sig_atomic_t checkpoint_requested;
@@ -1683,12 +1682,6 @@ static void dump_marks(void)
 	if (!export_marks_file || (import_marks_file && !import_marks_file_done))
 		return;
 
-	if (safe_create_leading_directories_const(export_marks_file)) {
-		failure |= error_errno("unable to create leading directories of %s",
-				       export_marks_file);
-		return;
-	}
-
 	if (hold_lock_file_for_update(&mark_lock, export_marks_file, 0) < 0) {
 		failure |= error_errno("Unable to write marks file %s",
 				       export_marks_file);
@@ -1770,6 +1763,7 @@ static int read_next_command(void)
 		} else {
 			struct recent_command *rc;
 
+			strbuf_detach(&command_buf, NULL);
 			stdin_eof = strbuf_getline_lf(&command_buf, stdin);
 			if (stdin_eof)
 				return EOF;
@@ -1790,7 +1784,7 @@ static int read_next_command(void)
 				free(rc->buf);
 			}
 
-			rc->buf = xstrdup(command_buf.buf);
+			rc->buf = command_buf.buf;
 			rc->prev = cmd_tail;
 			rc->next = cmd_hist.prev;
 			rc->prev->next = rc;
@@ -1839,6 +1833,7 @@ static int parse_data(struct strbuf *sb, uintmax_t limit, uintmax_t *len_res)
 		char *term = xstrdup(data);
 		size_t term_len = command_buf.len - (data - command_buf.buf);
 
+		strbuf_detach(&command_buf, NULL);
 		for (;;) {
 			if (strbuf_getline_lf(&command_buf, stdin) == EOF)
 				die("EOF in data (terminator '%s' not found)", term);
@@ -2496,14 +2491,18 @@ static void parse_from_existing(struct branch *b)
 	}
 }
 
-static int parse_objectish(struct branch *b, const char *objectish)
+static int parse_from(struct branch *b)
 {
+	const char *from;
 	struct branch *s;
 	struct object_id oid;
 
+	if (!skip_prefix(command_buf.buf, "from ", &from))
+		return 0;
+
 	oidcpy(&oid, &b->branch_tree.versions[1].oid);
 
-	s = lookup_branch(objectish);
+	s = lookup_branch(from);
 	if (b == s)
 		die("Can't create a branch from itself: %s", b->name);
 	else if (s) {
@@ -2511,8 +2510,8 @@ static int parse_objectish(struct branch *b, const char *objectish)
 		oidcpy(&b->oid, &s->oid);
 		oidcpy(&b->branch_tree.versions[0].oid, t);
 		oidcpy(&b->branch_tree.versions[1].oid, t);
-	} else if (*objectish == ':') {
-		uintmax_t idnum = parse_mark_ref_eol(objectish);
+	} else if (*from == ':') {
+		uintmax_t idnum = parse_mark_ref_eol(from);
 		struct object_entry *oe = find_mark(idnum);
 		if (oe->type != OBJ_COMMIT)
 			die("Mark :%" PRIuMAX " not a commit", idnum);
@@ -2526,13 +2525,13 @@ static int parse_objectish(struct branch *b, const char *objectish)
 			} else
 				parse_from_existing(b);
 		}
-	} else if (!get_oid(objectish, &b->oid)) {
+	} else if (!get_oid(from, &b->oid)) {
 		parse_from_existing(b);
 		if (is_null_oid(&b->oid))
 			b->delete = 1;
 	}
 	else
-		die("Invalid ref name or SHA1 expression: %s", objectish);
+		die("Invalid ref name or SHA1 expression: %s", from);
 
 	if (b->branch_tree.tree && !oideq(&oid, &b->branch_tree.versions[1].oid)) {
 		release_tree_content_recursive(b->branch_tree.tree);
@@ -2543,26 +2542,6 @@ static int parse_objectish(struct branch *b, const char *objectish)
 	return 1;
 }
 
-static int parse_from(struct branch *b)
-{
-	const char *from;
-
-	if (!skip_prefix(command_buf.buf, "from ", &from))
-		return 0;
-
-	return parse_objectish(b, from);
-}
-
-static int parse_objectish_with_prefix(struct branch *b, const char *prefix)
-{
-	const char *base;
-
-	if (!skip_prefix(command_buf.buf, prefix, &base))
-		return 0;
-
-	return parse_objectish(b, base);
-}
-
 static struct hash_list *parse_merge(unsigned int *count)
 {
 	struct hash_list *list = NULL, **tail = &list, *n;
@@ -2609,7 +2588,7 @@ static void parse_new_commit(const char *arg)
 	struct branch *b;
 	char *author = NULL;
 	char *committer = NULL;
-	char *encoding = NULL;
+	const char *encoding = NULL;
 	struct hash_list *merge_list = NULL;
 	unsigned int merge_count;
 	unsigned char prev_fanout, new_fanout;
@@ -2632,10 +2611,8 @@ static void parse_new_commit(const char *arg)
 	}
 	if (!committer)
 		die("Expected committer but didn't get one");
-	if (skip_prefix(command_buf.buf, "encoding ", &v)) {
-		encoding = xstrdup(v);
+	if (skip_prefix(command_buf.buf, "encoding ", &encoding))
 		read_next_command();
-	}
 	parse_data(&msg, 0, NULL);
 	read_next_command();
 	parse_from(b);
@@ -2709,7 +2686,6 @@ static void parse_new_commit(const char *arg)
 	strbuf_addbuf(&new_data, &msg);
 	free(author);
 	free(committer);
-	free(encoding);
 
 	if (!store_object(OBJ_COMMIT, &new_data, NULL, &b->oid, next_mark))
 		b->pack_id = pack_id;
@@ -2737,7 +2713,6 @@ static void parse_new_tag(const char *arg)
 		first_tag = t;
 	last_tag = t;
 	read_next_command();
-	parse_mark();
 
 	/* from ... */
 	if (!skip_prefix(command_buf.buf, "from ", &from))
@@ -2794,7 +2769,7 @@ static void parse_new_tag(const char *arg)
 	strbuf_addbuf(&new_data, &msg);
 	free(tagger);
 
-	if (store_object(OBJ_TAG, &new_data, NULL, &t->oid, next_mark))
+	if (store_object(OBJ_TAG, &new_data, NULL, &t->oid, 0))
 		t->pack_id = MAX_PACK_ID;
 	else
 		t->pack_id = pack_id;
@@ -2803,7 +2778,6 @@ static void parse_new_tag(const char *arg)
 static void parse_reset_branch(const char *arg)
 {
 	struct branch *b;
-	const char *tag_name;
 
 	b = lookup_branch(arg);
 	if (b) {
@@ -2819,32 +2793,6 @@ static void parse_reset_branch(const char *arg)
 		b = new_branch(arg);
 	read_next_command();
 	parse_from(b);
-	if (b->delete && skip_prefix(b->name, "refs/tags/", &tag_name)) {
-		/*
-		 * Elsewhere, we call dump_branches() before dump_tags(),
-		 * and dump_branches() will handle ref deletions first, so
-		 * in order to make sure the deletion actually takes effect,
-		 * we need to remove the tag from our list of tags to update.
-		 *
-		 * NEEDSWORK: replace list of tags with hashmap for faster
-		 * deletion?
-		 */
-		struct tag *t, *prev = NULL;
-		for (t = first_tag; t; t = t->next_tag) {
-			if (!strcmp(t->name, tag_name))
-				break;
-			prev = t;
-		}
-		if (t) {
-			if (prev)
-				prev->next_tag = t->next_tag;
-			else
-				first_tag = t->next_tag;
-			if (!t->next_tag)
-				last_tag = prev;
-			/* There is no mem_pool_free(t) function to call. */
-		}
-	}
 	if (command_buf.len > 0)
 		unread_command_buf = 1;
 }
@@ -3111,28 +3059,6 @@ static void parse_progress(void)
 	skip_optional_lf();
 }
 
-static void parse_alias(void)
-{
-	struct object_entry *e;
-	struct branch b;
-
-	skip_optional_lf();
-	read_next_command();
-
-	/* mark ... */
-	parse_mark();
-	if (!next_mark)
-		die(_("Expected 'mark' command, got %s"), command_buf.buf);
-
-	/* to ... */
-	memset(&b, 0, sizeof(b));
-	if (!parse_objectish_with_prefix(&b, "to "))
-		die(_("Expected 'to' command, got %s"), command_buf.buf);
-	e = find_object(&b.oid);
-	assert(e);
-	insert_mark(next_mark, e);
-}
-
 static char* make_fast_import_path(const char *path)
 {
 	if (!relative_marks_paths || is_absolute_path(path))
@@ -3153,6 +3079,7 @@ static void option_import_marks(const char *marks,
 	}
 
 	import_marks_file = make_fast_import_path(marks);
+	safe_create_leading_directories_const(import_marks_file);
 	import_marks_file_from_stream = from_stream;
 	import_marks_file_ignore_missing = ignore_missing;
 }
@@ -3193,6 +3120,7 @@ static void option_active_branches(const char *branches)
 static void option_export_marks(const char *marks)
 {
 	export_marks_file = make_fast_import_path(marks);
+	safe_create_leading_directories_const(export_marks_file);
 }
 
 static void option_cat_blob_fd(const char *fd)
@@ -3235,12 +3163,10 @@ static int parse_one_option(const char *option)
 		option_active_branches(option);
 	} else if (skip_prefix(option, "export-pack-edges=", &option)) {
 		option_export_pack_edges(option);
-	} else if (!strcmp(option, "quiet")) {
+	} else if (starts_with(option, "quiet")) {
 		show_stats = 0;
-	} else if (!strcmp(option, "stats")) {
+	} else if (starts_with(option, "stats")) {
 		show_stats = 1;
-	} else if (!strcmp(option, "allow-unsafe-features")) {
-		; /* already handled during early option parsing */
 	} else {
 		return 0;
 	}
@@ -3248,13 +3174,6 @@ static int parse_one_option(const char *option)
 	return 1;
 }
 
-static void check_unsafe_feature(const char *feature, int from_stream)
-{
-	if (from_stream && !allow_unsafe_features)
-		die(_("feature '%s' forbidden in input without --allow-unsafe-features"),
-		    feature);
-}
-
 static int parse_one_feature(const char *feature, int from_stream)
 {
 	const char *arg;
@@ -3262,16 +3181,11 @@ static int parse_one_feature(const char *feature, int from_stream)
 	if (skip_prefix(feature, "date-format=", &arg)) {
 		option_date_format(arg);
 	} else if (skip_prefix(feature, "import-marks=", &arg)) {
-		check_unsafe_feature("import-marks", from_stream);
 		option_import_marks(arg, from_stream, 0);
 	} else if (skip_prefix(feature, "import-marks-if-exists=", &arg)) {
-		check_unsafe_feature("import-marks-if-exists", from_stream);
 		option_import_marks(arg, from_stream, 1);
 	} else if (skip_prefix(feature, "export-marks=", &arg)) {
-		check_unsafe_feature(feature, from_stream);
 		option_export_marks(arg);
-	} else if (!strcmp(feature, "alias")) {
-		; /* Don't die - this feature is supported */
 	} else if (!strcmp(feature, "get-mark")) {
 		; /* Don't die - this feature is supported */
 	} else if (!strcmp(feature, "cat-blob")) {
@@ -3397,20 +3311,6 @@ int cmd_main(int argc, const char **argv)
 	avail_tree_table = xcalloc(avail_tree_table_sz, sizeof(struct avail_tree_content*));
 	marks = mem_pool_calloc(&fi_mem_pool, 1, sizeof(struct mark_set));
 
-	/*
-	 * We don't parse most options until after we've seen the set of
-	 * "feature" lines at the start of the stream (which allows the command
-	 * line to override stream data). But we must do an early parse of any
-	 * command-line options that impact how we interpret the feature lines.
-	 */
-	for (i = 1; i < argc; i++) {
-		const char *arg = argv[i];
-		if (*arg != '-' || !strcmp(arg, "--"))
-			break;
-		if (!strcmp(arg, "--allow-unsafe-features"))
-			allow_unsafe_features = 1;
-	}
-
 	global_argc = argc;
 	global_argv = argv;
 
@@ -3442,8 +3342,6 @@ int cmd_main(int argc, const char **argv)
 			parse_checkpoint();
 		else if (!strcmp("done", command_buf.buf))
 			break;
-		else if (!strcmp("alias", command_buf.buf))
-			parse_alias();
 		else if (starts_with(command_buf.buf, "progress "))
 			parse_progress();
 		else if (skip_prefix(command_buf.buf, "feature ", &v))