remote-testsvn.c - jrn/git - Git at Google

 #include "cache.h"
 #include "refs.h"
 #include "remote.h"
 #include "strbuf.h"
 #include "url.h"
 #include "exec_cmd.h"
 #include "run-command.h"
 #include "vcs-svn/svndump.h"
 #include "notes.h"
 #include "argv-array.h"

 static const char *url;
 static int dump_from_file;
 static const char *private_ref;
 static const char *remote_ref = "refs/heads/master";
 static const char *marksfilename, *notes_ref;
 struct rev_note { unsigned int rev_nr; };

 static int cmd_capabilities(const char *line);
 static int cmd_import(const char *line);
 static int cmd_list(const char *line);

 typedef int (*input_command_handler)(const char *);
 struct input_command_entry {
 	const char *name;
 	input_command_handler fn;
 	unsigned char batchable;	/* whether the command starts or is part of a batch */
 };

 static const struct input_command_entry input_command_list[] = {
 	{ "capabilities", cmd_capabilities, 0 },
 	{ "import", cmd_import, 1 },
 	{ "list", cmd_list, 0 },
 	{ NULL, NULL }
 };

 static int cmd_capabilities(const char *line)
 {
 	printf("import\n");
 	printf("bidi-import\n");
 	printf("refspec %s:%s\n\n", remote_ref, private_ref);
 	fflush(stdout);
 	return 0;
 }

 static void terminate_batch(void)
 {
 	/* terminate a current batch's fast-import stream */
 	printf("done\n");
 	fflush(stdout);
 }

 /* NOTE: 'ref' refers to a git reference, while 'rev' refers to a svn revision. */
 static char *read_ref_note(const unsigned char sha1[20])
 {
 	const unsigned char *note_sha1;
 	char *msg = NULL;
 	unsigned long msglen;
 	enum object_type type;

 	init_notes(NULL, notes_ref, NULL, 0);
 	if (!(note_sha1 = get_note(NULL, sha1)))
 		return NULL;	/* note tree not found */
 	if (!(msg = read_sha1_file(note_sha1, &type, &msglen)))
 		error("Empty notes tree. %s", notes_ref);
 	else if (!msglen || type != OBJ_BLOB) {
 		error("Note contains unusable content. "
 			"Is something else using this notes tree? %s", notes_ref);
 		free(msg);
 		msg = NULL;
 	}
 	free_notes(NULL);
 	return msg;
 }

 static int parse_rev_note(const char *msg, struct rev_note *res)
 {
 	const char *key, *value, *end;
 	size_t len;

 	while (*msg) {
 		end = strchrnul(msg, '\n');
 		len = end - msg;

 		key = "Revision-number: ";
 		if (starts_with(msg, key)) {
 			long i;
 			char *end;
 			value = msg + strlen(key);
 			i = strtol(value, &end, 0);
 			if (end == value || i < 0 || i > UINT32_MAX)
 				return -1;
 			res->rev_nr = i;
 			return 0;
 		}
 		msg += len + 1;
 	}
 	/* didn't find it */
 	return -1;
 }

 static int note2mark_cb(const unsigned char *object_sha1,
 		const unsigned char *note_sha1, char *note_path,
 		void *cb_data)
 {
 	FILE *file = (FILE *)cb_data;
 	char *msg;
 	unsigned long msglen;
 	enum object_type type;
 	struct rev_note note;

 	if (!(msg = read_sha1_file(note_sha1, &type, &msglen)) ||
 			!msglen || type != OBJ_BLOB) {
 		free(msg);
 		return 1;
 	}
 	if (parse_rev_note(msg, &note))
 		return 2;
 	if (fprintf(file, ":%d %s\n", note.rev_nr, sha1_to_hex(object_sha1)) < 1)
 		return 3;
 	return 0;
 }

 static void regenerate_marks(void)
 {
 	int ret;
 	FILE *marksfile = fopen(marksfilename, "w+");

 	if (!marksfile)
 		die_errno("Couldn't create mark file %s.", marksfilename);
 	ret = for_each_note(NULL, 0, note2mark_cb, marksfile);
 	if (ret)
 		die("Regeneration of marks failed, returned %d.", ret);
 	fclose(marksfile);
 }

 static void check_or_regenerate_marks(int latestrev)
 {
 	FILE *marksfile;
 	struct strbuf sb = STRBUF_INIT;
 	struct strbuf line = STRBUF_INIT;
 	int found = 0;

 	if (latestrev < 1)
 		return;

 	init_notes(NULL, notes_ref, NULL, 0);
 	marksfile = fopen(marksfilename, "r");
 	if (!marksfile) {
 		regenerate_marks();
 		marksfile = fopen(marksfilename, "r");
 		if (!marksfile)
 			die_errno("cannot read marks file %s!", marksfilename);
 		fclose(marksfile);
 	} else {
 		strbuf_addf(&sb, ":%d ", latestrev);
 		while (strbuf_getline_lf(&line, marksfile) != EOF) {
 			if (starts_with(line.buf, sb.buf)) {
 				found++;
 				break;
 			}
 		}
 		fclose(marksfile);
 		if (!found)
 			regenerate_marks();
 	}
 	free_notes(NULL);
 	strbuf_release(&sb);
 	strbuf_release(&line);
 }

 static int cmd_import(const char *line)
 {
 	int code;
 	int dumpin_fd;
 	char *note_msg;
 	unsigned char head_sha1[20];
 	unsigned int startrev;
 	struct child_process svndump_proc = CHILD_PROCESS_INIT;
 	const char *command = "svnrdump";

 	if (read_ref(private_ref, head_sha1))
 		startrev = 0;
 	else {
 		note_msg = read_ref_note(head_sha1);
 		if(note_msg == NULL) {
 			warning("No note found for %s.", private_ref);
 			startrev = 0;
 		} else {
 			struct rev_note note = { 0 };
 			if (parse_rev_note(note_msg, &note))
 				die("Revision number couldn't be parsed from note.");
 			startrev = note.rev_nr + 1;
 			free(note_msg);
 		}
 	}
 	check_or_regenerate_marks(startrev - 1);

 	if (dump_from_file) {
 		dumpin_fd = open(url, O_RDONLY);
 		if(dumpin_fd < 0)
 			die_errno("Couldn't open svn dump file %s.", url);
 	} else {
 		svndump_proc.out = -1;
 		argv_array_push(&svndump_proc.args, command);
 		argv_array_push(&svndump_proc.args, "dump");
 		argv_array_push(&svndump_proc.args, url);
 		argv_array_pushf(&svndump_proc.args, "-r%u:HEAD", startrev);

 		code = start_command(&svndump_proc);
 		if (code)
 			die("Unable to start %s, code %d", command, code);
 		dumpin_fd = svndump_proc.out;
 	}
 	/* setup marks file import/export */
 	printf("feature import-marks-if-exists=%s\n"
 			"feature export-marks=%s\n", marksfilename, marksfilename);

 	svndump_init_fd(dumpin_fd, STDIN_FILENO);
 	svndump_read(url, private_ref, notes_ref);
 	svndump_deinit();
 	svndump_reset();

 	close(dumpin_fd);
 	if (!dump_from_file) {
 		code = finish_command(&svndump_proc);
 		if (code)
 			warning("%s, returned %d", command, code);
 	}

 	return 0;
 }

 static int cmd_list(const char *line)
 {
 	printf("? %s\n\n", remote_ref);
 	fflush(stdout);
 	return 0;
 }

 static int do_command(struct strbuf *line)
 {
 	const struct input_command_entry *p = input_command_list;
 	static struct string_list batchlines = STRING_LIST_INIT_DUP;
 	static const struct input_command_entry *batch_cmd;
 	/*
 	 * commands can be grouped together in a batch.
 	 * Batches are ended by \n. If no batch is active the program ends.
 	 * During a batch all lines are buffered and passed to the handler function
 	 * when the batch is terminated.
 	 */
 	if (line->len == 0) {
 		if (batch_cmd) {
 			struct string_list_item *item;
 			for_each_string_list_item(item, &batchlines)
 				batch_cmd->fn(item->string);
 			terminate_batch();
 			batch_cmd = NULL;
 			string_list_clear(&batchlines, 0);
 			return 0;	/* end of the batch, continue reading other commands. */
 		}
 		return 1;	/* end of command stream, quit */
 	}
 	if (batch_cmd) {
 		if (!starts_with(batch_cmd->name, line->buf))
 			die("Active %s batch interrupted by %s", batch_cmd->name, line->buf);
 		/* buffer batch lines */
 		string_list_append(&batchlines, line->buf);
 		return 0;
 	}

 	for (p = input_command_list; p->name; p++) {
 		if (starts_with(line->buf, p->name) && (strlen(p->name) == line->len ||
 				line->buf[strlen(p->name)] == ' ')) {
 			if (p->batchable) {
 				batch_cmd = p;
 				string_list_append(&batchlines, line->buf);
 				return 0;
 			}
 			return p->fn(line->buf);
 		}
 	}
 	die("Unknown command '%s'\n", line->buf);
 	return 0;
 }

 int cmd_main(int argc, const char **argv)
 {
 	struct strbuf buf = STRBUF_INIT, url_sb = STRBUF_INIT,
 			private_ref_sb = STRBUF_INIT, marksfilename_sb = STRBUF_INIT,
 			notes_ref_sb = STRBUF_INIT;
 	static struct remote *remote;
 	const char *url_in;

 	setup_git_directory();
 	if (argc < 2 || argc > 3) {
 		usage("git-remote-svn <remote-name> [<url>]");
 		return 1;
 	}

 	remote = remote_get(argv[1]);
 	url_in = (argc == 3) ? argv[2] : remote->url[0];

 	if (starts_with(url_in, "file://")) {
 		dump_from_file = 1;
 		url = url_decode(url_in + sizeof("file://")-1);
 	} else {
 		dump_from_file = 0;
 		end_url_with_slash(&url_sb, url_in);
 		url = url_sb.buf;
 	}

 	strbuf_addf(&private_ref_sb, "refs/svn/%s/master", remote->name);
 	private_ref = private_ref_sb.buf;

 	strbuf_addf(&notes_ref_sb, "refs/notes/%s/revs", remote->name);
 	notes_ref = notes_ref_sb.buf;

 	strbuf_addf(&marksfilename_sb, "%s/info/fast-import/remote-svn/%s.marks",
 		get_git_dir(), remote->name);
 	marksfilename = marksfilename_sb.buf;

 	while (1) {
 		if (strbuf_getline_lf(&buf, stdin) == EOF) {
 			if (ferror(stdin))
 				die("Error reading command stream");
 			else
 				die("Unexpected end of command stream");
 		}
 		if (do_command(&buf))
 			break;
 		strbuf_reset(&buf);
 	}

 	strbuf_release(&buf);
 	strbuf_release(&url_sb);
 	strbuf_release(&private_ref_sb);
 	strbuf_release(&notes_ref_sb);
 	strbuf_release(&marksfilename_sb);
 	return 0;
 }
	#include "cache.h"
	#include "refs.h"
	#include "remote.h"
	#include "strbuf.h"
	#include "url.h"
	#include "exec_cmd.h"
	#include "run-command.h"
	#include "vcs-svn/svndump.h"
	#include "notes.h"
	#include "argv-array.h"

	static const char *url;
	static int dump_from_file;
	static const char *private_ref;
	static const char *remote_ref = "refs/heads/master";
	static const char marksfilename, notes_ref;
	struct rev_note { unsigned int rev_nr; };

	static int cmd_capabilities(const char *line);
	static int cmd_import(const char *line);
	static int cmd_list(const char *line);

	typedef int (input_command_handler)(const char );
	struct input_command_entry {
	const char *name;
	input_command_handler fn;
	unsigned char batchable; /* whether the command starts or is part of a batch */
	};

	static const struct input_command_entry input_command_list[] = {
	{ "capabilities", cmd_capabilities, 0 },
	{ "import", cmd_import, 1 },
	{ "list", cmd_list, 0 },
	{ NULL, NULL }
	};

	static int cmd_capabilities(const char *line)
	{
	printf("import\n");
	printf("bidi-import\n");
	printf("refspec %s:%s\n\n", remote_ref, private_ref);
	fflush(stdout);
	return 0;
	}

	static void terminate_batch(void)
	{
	/* terminate a current batch's fast-import stream */
	printf("done\n");
	fflush(stdout);
	}

	/* NOTE: 'ref' refers to a git reference, while 'rev' refers to a svn revision. */
	static char *read_ref_note(const unsigned char sha1[20])
	{
	const unsigned char *note_sha1;
	char *msg = NULL;
	unsigned long msglen;
	enum object_type type;

	init_notes(NULL, notes_ref, NULL, 0);
	if (!(note_sha1 = get_note(NULL, sha1)))
	return NULL; /* note tree not found */
	if (!(msg = read_sha1_file(note_sha1, &type, &msglen)))
	error("Empty notes tree. %s", notes_ref);
	else if (!msglen \|\| type != OBJ_BLOB) {
	error("Note contains unusable content. "
	"Is something else using this notes tree? %s", notes_ref);
	free(msg);
	msg = NULL;
	}
	free_notes(NULL);
	return msg;
	}

	static int parse_rev_note(const char msg, struct rev_note res)
	{
	const char key, value, *end;
	size_t len;

	while (*msg) {
	end = strchrnul(msg, '\n');
	len = end - msg;

	key = "Revision-number: ";
	if (starts_with(msg, key)) {
	long i;
	char *end;
	value = msg + strlen(key);
	i = strtol(value, &end, 0);
	if (end == value \|\| i < 0 \|\| i > UINT32_MAX)
	return -1;
	res->rev_nr = i;
	return 0;
	}
	msg += len + 1;
	}
	/* didn't find it */
	return -1;
	}

	static int note2mark_cb(const unsigned char *object_sha1,
	const unsigned char note_sha1, char note_path,
	void *cb_data)
	{
	FILE file = (FILE )cb_data;
	char *msg;
	unsigned long msglen;
	enum object_type type;
	struct rev_note note;

	if (!(msg = read_sha1_file(note_sha1, &type, &msglen)) \|\|
	!msglen \|\| type != OBJ_BLOB) {
	free(msg);
	return 1;
	}
	if (parse_rev_note(msg, &note))
	return 2;
	if (fprintf(file, ":%d %s\n", note.rev_nr, sha1_to_hex(object_sha1)) < 1)
	return 3;
	return 0;
	}

	static void regenerate_marks(void)
	{
	int ret;
	FILE *marksfile = fopen(marksfilename, "w+");

	if (!marksfile)
	die_errno("Couldn't create mark file %s.", marksfilename);
	ret = for_each_note(NULL, 0, note2mark_cb, marksfile);
	if (ret)
	die("Regeneration of marks failed, returned %d.", ret);
	fclose(marksfile);
	}

	static void check_or_regenerate_marks(int latestrev)
	{
	FILE *marksfile;
	struct strbuf sb = STRBUF_INIT;
	struct strbuf line = STRBUF_INIT;
	int found = 0;

	if (latestrev < 1)
	return;

	init_notes(NULL, notes_ref, NULL, 0);
	marksfile = fopen(marksfilename, "r");
	if (!marksfile) {
	regenerate_marks();
	marksfile = fopen(marksfilename, "r");
	if (!marksfile)
	die_errno("cannot read marks file %s!", marksfilename);
	fclose(marksfile);
	} else {
	strbuf_addf(&sb, ":%d ", latestrev);
	while (strbuf_getline_lf(&line, marksfile) != EOF) {
	if (starts_with(line.buf, sb.buf)) {
	found++;
	break;
	}
	}
	fclose(marksfile);
	if (!found)
	regenerate_marks();
	}
	free_notes(NULL);
	strbuf_release(&sb);
	strbuf_release(&line);
	}

	static int cmd_import(const char *line)
	{
	int code;
	int dumpin_fd;
	char *note_msg;
	unsigned char head_sha1[20];
	unsigned int startrev;
	struct child_process svndump_proc = CHILD_PROCESS_INIT;
	const char *command = "svnrdump";

	if (read_ref(private_ref, head_sha1))
	startrev = 0;
	else {
	note_msg = read_ref_note(head_sha1);
	if(note_msg == NULL) {
	warning("No note found for %s.", private_ref);
	startrev = 0;
	} else {
	struct rev_note note = { 0 };
	if (parse_rev_note(note_msg, &note))
	die("Revision number couldn't be parsed from note.");
	startrev = note.rev_nr + 1;
	free(note_msg);
	}
	}
	check_or_regenerate_marks(startrev - 1);

	if (dump_from_file) {
	dumpin_fd = open(url, O_RDONLY);
	if(dumpin_fd < 0)
	die_errno("Couldn't open svn dump file %s.", url);
	} else {
	svndump_proc.out = -1;
	argv_array_push(&svndump_proc.args, command);
	argv_array_push(&svndump_proc.args, "dump");
	argv_array_push(&svndump_proc.args, url);
	argv_array_pushf(&svndump_proc.args, "-r%u:HEAD", startrev);

	code = start_command(&svndump_proc);
	if (code)
	die("Unable to start %s, code %d", command, code);
	dumpin_fd = svndump_proc.out;
	}
	/* setup marks file import/export */
	printf("feature import-marks-if-exists=%s\n"
	"feature export-marks=%s\n", marksfilename, marksfilename);

	svndump_init_fd(dumpin_fd, STDIN_FILENO);
	svndump_read(url, private_ref, notes_ref);
	svndump_deinit();
	svndump_reset();

	close(dumpin_fd);
	if (!dump_from_file) {
	code = finish_command(&svndump_proc);
	if (code)
	warning("%s, returned %d", command, code);
	}

	return 0;
	}

	static int cmd_list(const char *line)
	{
	printf("? %s\n\n", remote_ref);
	fflush(stdout);
	return 0;
	}

	static int do_command(struct strbuf *line)
	{
	const struct input_command_entry *p = input_command_list;
	static struct string_list batchlines = STRING_LIST_INIT_DUP;
	static const struct input_command_entry *batch_cmd;
	/*
	* commands can be grouped together in a batch.
	* Batches are ended by \n. If no batch is active the program ends.
	* During a batch all lines are buffered and passed to the handler function
	* when the batch is terminated.
	*/
	if (line->len == 0) {
	if (batch_cmd) {
	struct string_list_item *item;
	for_each_string_list_item(item, &batchlines)
	batch_cmd->fn(item->string);
	terminate_batch();
	batch_cmd = NULL;
	string_list_clear(&batchlines, 0);
	return 0; /* end of the batch, continue reading other commands. */
	}
	return 1; /* end of command stream, quit */
	}
	if (batch_cmd) {
	if (!starts_with(batch_cmd->name, line->buf))
	die("Active %s batch interrupted by %s", batch_cmd->name, line->buf);
	/* buffer batch lines */
	string_list_append(&batchlines, line->buf);
	return 0;
	}

	for (p = input_command_list; p->name; p++) {
	if (starts_with(line->buf, p->name) && (strlen(p->name) == line->len \|\|
	line->buf[strlen(p->name)] == ' ')) {
	if (p->batchable) {
	batch_cmd = p;
	string_list_append(&batchlines, line->buf);
	return 0;
	}
	return p->fn(line->buf);
	}
	}
	die("Unknown command '%s'\n", line->buf);
	return 0;
	}

	int cmd_main(int argc, const char **argv)
	{
	struct strbuf buf = STRBUF_INIT, url_sb = STRBUF_INIT,
	private_ref_sb = STRBUF_INIT, marksfilename_sb = STRBUF_INIT,
	notes_ref_sb = STRBUF_INIT;
	static struct remote *remote;
	const char *url_in;

	setup_git_directory();
	if (argc < 2 \|\| argc > 3) {
	usage("git-remote-svn <remote-name> [<url>]");
	return 1;
	}

	remote = remote_get(argv[1]);
	url_in = (argc == 3) ? argv[2] : remote->url[0];

	if (starts_with(url_in, "file://")) {
	dump_from_file = 1;
	url = url_decode(url_in + sizeof("file://")-1);
	} else {
	dump_from_file = 0;
	end_url_with_slash(&url_sb, url_in);
	url = url_sb.buf;
	}

	strbuf_addf(&private_ref_sb, "refs/svn/%s/master", remote->name);
	private_ref = private_ref_sb.buf;

	strbuf_addf(&notes_ref_sb, "refs/notes/%s/revs", remote->name);
	notes_ref = notes_ref_sb.buf;

	strbuf_addf(&marksfilename_sb, "%s/info/fast-import/remote-svn/%s.marks",
	get_git_dir(), remote->name);
	marksfilename = marksfilename_sb.buf;

	while (1) {
	if (strbuf_getline_lf(&buf, stdin) == EOF) {
	if (ferror(stdin))
	die("Error reading command stream");
	else
	die("Unexpected end of command stream");
	}
	if (do_command(&buf))
	break;
	strbuf_reset(&buf);
	}

	strbuf_release(&buf);
	strbuf_release(&url_sb);
	strbuf_release(&private_ref_sb);
	strbuf_release(&notes_ref_sb);
	strbuf_release(&marksfilename_sb);
	return 0;
	}