Merge branch 'nd/shallow-deepen'

The existing "git fetch --depth=<n>" option was hard to use
correctly when making the history of an existing shallow clone
deeper.  A new option, "--deepen=<n>", has been added to make this
easier to use.  "git clone" also learned "--shallow-since=<date>"
and "--shallow-exclude=<tag>" options to make it easier to specify
"I am interested only in the recent N months worth of history" and
"Give me only the history since that version".

* nd/shallow-deepen: (27 commits)
  fetch, upload-pack: --deepen=N extends shallow boundary by N commits
  upload-pack: add get_reachable_list()
  upload-pack: split check_unreachable() in two, prep for get_reachable_list()
  t5500, t5539: tests for shallow depth excluding a ref
  clone: define shallow clone boundary with --shallow-exclude
  fetch: define shallow boundary with --shallow-exclude
  upload-pack: support define shallow boundary by excluding revisions
  refs: add expand_ref()
  t5500, t5539: tests for shallow depth since a specific date
  clone: define shallow clone boundary based on time with --shallow-since
  fetch: define shallow boundary with --shallow-since
  upload-pack: add deepen-since to cut shallow repos based on time
  shallow.c: implement a generic shallow boundary finder based on rev-list
  fetch-pack: use a separate flag for fetch in deepening mode
  fetch-pack.c: mark strings for translating
  fetch-pack: use a common function for verbose printing
  fetch-pack: use skip_prefix() instead of starts_with()
  upload-pack: move rev-list code out of check_non_tip()
  upload-pack: make check_non_tip() clean things up on error
  upload-pack: tighten number parsing at "deepen" lines
  ...

remote-curl.c

@@ -20,6 +20,8 @@ static struct strbuf url = STRBUF_INIT;
 struct options {
 	int verbosity;
 	unsigned long depth;
+	char *deepen_since;
+	struct string_list deepen_not;
 	unsigned progress : 1,
 		check_self_contained_and_connected : 1,
 		cloning : 1,
@@ -28,7 +30,8 @@ struct options {
 		dry_run : 1,
 		thin : 1,
 		/* One of the SEND_PACK_PUSH_CERT_* constants. */
-		push_cert : 2;
+		push_cert : 2,
+		deepen_relative : 1;
 };
 static struct options options;
 static struct string_list cas_options = STRING_LIST_INIT_DUP;
@@ -60,6 +63,23 @@ static int set_option(const char *name, const char *value)
 		options.depth = v;
 		return 0;
 	}
+	else if (!strcmp(name, "deepen-since")) {
+		options.deepen_since = xstrdup(value);
+		return 0;
+	}
+	else if (!strcmp(name, "deepen-not")) {
+		string_list_append(&options.deepen_not, value);
+		return 0;
+	}
+	else if (!strcmp(name, "deepen-relative")) {
+		if (!strcmp(value, "true"))
+			options.deepen_relative = 1;
+		else if (!strcmp(value, "false"))
+			options.deepen_relative = 0;
+		else
+			return -1;
+		return 0;
+	}
 	else if (!strcmp(name, "followtags")) {
 		if (!strcmp(value, "true"))
 			options.followtags = 1;
@@ -725,8 +745,8 @@ static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 	int ret, i;
 
 	ALLOC_ARRAY(targets, nr_heads);
-	if (options.depth)
-		die("dumb http transport does not support --depth");
+	if (options.depth || options.deepen_since)
+		die("dumb http transport does not support shallow capabilities");
 	for (i = 0; i < nr_heads; i++)
 		targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 
@@ -751,38 +771,35 @@ static int fetch_git(struct discovery *heads,
 {
 	struct rpc_state rpc;
 	struct strbuf preamble = STRBUF_INIT;
-	char *depth_arg = NULL;
-	int argc = 0, i, err;
-	const char *argv[17];
+	int i, err;
+	struct argv_array args = ARGV_ARRAY_INIT;
 
-	argv[argc++] = "fetch-pack";
-	argv[argc++] = "--stateless-rpc";
-	argv[argc++] = "--stdin";
-	argv[argc++] = "--lock-pack";
+	argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
+			 "--stdin", "--lock-pack", NULL);
 	if (options.followtags)
-		argv[argc++] = "--include-tag";
+		argv_array_push(&args, "--include-tag");
 	if (options.thin)
-		argv[argc++] = "--thin";
-	if (options.verbosity >= 3) {
-		argv[argc++] = "-v";
-		argv[argc++] = "-v";
-	}
+		argv_array_push(&args, "--thin");
+	if (options.verbosity >= 3)
+		argv_array_pushl(&args, "-v", "-v", NULL);
 	if (options.check_self_contained_and_connected)
-		argv[argc++] = "--check-self-contained-and-connected";
+		argv_array_push(&args, "--check-self-contained-and-connected");
 	if (options.cloning)
-		argv[argc++] = "--cloning";
+		argv_array_push(&args, "--cloning");
 	if (options.update_shallow)
-		argv[argc++] = "--update-shallow";
+		argv_array_push(&args, "--update-shallow");
 	if (!options.progress)
-		argv[argc++] = "--no-progress";
-	if (options.depth) {
-		struct strbuf buf = STRBUF_INIT;
-		strbuf_addf(&buf, "--depth=%lu", options.depth);
-		depth_arg = strbuf_detach(&buf, NULL);
-		argv[argc++] = depth_arg;
-	}
-	argv[argc++] = url.buf;
-	argv[argc++] = NULL;
+		argv_array_push(&args, "--no-progress");
+	if (options.depth)
+		argv_array_pushf(&args, "--depth=%lu", options.depth);
+	if (options.deepen_since)
+		argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
+	for (i = 0; i < options.deepen_not.nr; i++)
+		argv_array_pushf(&args, "--shallow-exclude=%s",
+				 options.deepen_not.items[i].string);
+	if (options.deepen_relative && options.depth)
+		argv_array_push(&args, "--deepen-relative");
+	argv_array_push(&args, url.buf);
 
 	for (i = 0; i < nr_heads; i++) {
 		struct ref *ref = to_fetch[i];
@@ -795,7 +812,7 @@ static int fetch_git(struct discovery *heads,
 
 	memset(&rpc, 0, sizeof(rpc));
 	rpc.service_name = "git-upload-pack",
-	rpc.argv = argv;
+	rpc.argv = args.argv;
 	rpc.stdin_preamble = &preamble;
 	rpc.gzip_request = 1;
 
@@ -804,7 +821,7 @@ static int fetch_git(struct discovery *heads,
 		write_or_die(1, rpc.result.buf, rpc.result.len);
 	strbuf_release(&rpc.result);
 	strbuf_release(&preamble);
-	free(depth_arg);
+	argv_array_clear(&args);
 	return err;
 }
 
@@ -998,6 +1015,7 @@ int cmd_main(int argc, const char **argv)
 	options.verbosity = 1;
 	options.progress = !!isatty(2);
 	options.thin = 1;
+	string_list_init(&options.deepen_not, 1);
 
 	remote = remote_get(argv[1]);