X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=send-pack.c;h=02d1d52c2475759f2b206912bbd626f749a6b750;hb=d289d13625ffa568c3007c3620eaafeb521ac06d;hp=99cb84b2c4820878839b18557c2c51e07390f099;hpb=f3a3214e83be2905c57eff5d9035d169cae4644e;p=git.git

diff --git a/send-pack.c b/send-pack.c
index 99cb84b2..02d1d52c 100644
--- a/send-pack.c
+++ b/send-pack.c
@@ -1,93 +1,253 @@
 #include "cache.h"
+#include "refs.h"
 #include "pkt-line.h"
 
-static const char send_pack_usage[] = "git-send-pack [--exec=other] destination [heads]*";
-
+static const char send_pack_usage[] =
+"git-send-pack [--exec=git-receive-pack] [host:]directory [heads]*";
 static const char *exec = "git-receive-pack";
 
-static int send_pack(int in, int out)
+struct ref {
+	struct ref *next;
+	unsigned char old_sha1[20];
+	unsigned char new_sha1[20];
+	char name[0];
+};
+
+static int is_zero_sha1(const unsigned char *sha1)
 {
-	for (;;) {
-		static char buffer[1000];
-		int len;
+	int i;
 
-		len = packet_read_line(in, buffer, sizeof(buffer));
-		if (len > 0) {
-			write(2, buffer, len);
-			continue;
-		}
-		break;
+	for (i = 0; i < 20; i++) {
+		if (*sha1++)
+			return 0;
 	}
-	packet_flush(out);
-	close(out);
-	return 0;
+	return 1;
 }
 
-/*
- * First, make it shell-safe.  We do this by just disallowing any
- * special characters. Somebody who cares can do escaping and let
- * through the rest. But since we're doing to feed this to ssh as
- * a command line, we're going to be pretty damn anal for now.
- */
-static char *shell_safe(char *url)
+static void exec_pack_objects(void)
 {
-	char *n = url;
-	unsigned char c;
-	static const char flags[256] = {
-		['0'...'9'] = 1,
-		['a'...'z'] = 1,
-		['A'...'Z'] = 1,
-		['.'] = 1, ['/'] = 1,
-		['-'] = 1, ['+'] = 1,
-		[':'] = 1
+	static char *args[] = {
+		"git-pack-objects",
+		"--stdout",
+		NULL
 	};
+	execvp("git-pack-objects", args);
+	die("git-pack-objects exec failed (%s)", strerror(errno));
+}
 
-	while ((c = *n++) != 0) {
-		if (flags[c] != 1)
-			die("I don't like '%c'. Sue me.", c);
+static void exec_rev_list(struct ref *refs)
+{
+	static char *args[1000];
+	int i = 0;
+
+	args[i++] = "git-rev-list";	/* 0 */
+	args[i++] = "--objects";	/* 1 */
+	while (refs) {
+		char *buf = malloc(100);
+		if (i > 900)
+			die("git-rev-list environment overflow");
+		if (!is_zero_sha1(refs->old_sha1)) {
+			args[i++] = buf;
+			snprintf(buf, 50, "^%s", sha1_to_hex(refs->old_sha1));
+			buf += 50;
+		}
+		if (!is_zero_sha1(refs->new_sha1)) {
+			args[i++] = buf;
+			snprintf(buf, 50, "%s", sha1_to_hex(refs->new_sha1));
+		}
+		refs = refs->next;
 	}
-	return url;
+	args[i] = NULL;
+	execvp("git-rev-list", args);
+	die("git-rev-list exec failed (%s)", strerror(errno));
 }
 
-/*
- * Yeah, yeah, fixme. Need to pass in the heads etc.
- */
-static int setup_connection(int fd[2], char *url, char **heads)
+static void rev_list(int fd, struct ref *refs)
 {
-	char command[1024];
-	const char *host, *path;
-	char *colon;
-	int pipefd[2][2];
-
-	url = shell_safe(url);
-	host = NULL;
-	path = url;
-	colon = strchr(url, ':');
-	if (colon) {
-		*colon = 0;
-		host = url;
-		path = colon+1;
+	int pipe_fd[2];
+	pid_t pack_objects_pid;
+
+	if (pipe(pipe_fd) < 0)
+		die("rev-list setup: pipe failed");
+	pack_objects_pid = fork();
+	if (!pack_objects_pid) {
+		dup2(pipe_fd[0], 0);
+		dup2(fd, 1);
+		close(pipe_fd[0]);
+		close(pipe_fd[1]);
+		close(fd);
+		exec_pack_objects();
+		die("pack-objects setup failed");
 	}
-	snprintf(command, sizeof(command), "%s %s", exec, path);
-	if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
-		die("unable to create pipe pair for communication");
-	if (!fork()) {
-		dup2(pipefd[1][0], 0);
-		dup2(pipefd[0][1], 1);
-		close(pipefd[0][0]);
-		close(pipefd[0][1]);
-		close(pipefd[1][0]);
-		close(pipefd[1][1]);
-		if (host)
-			execlp("ssh", "ssh", host, command, NULL);
-		else
-			execlp("sh", "sh", "-c", command, NULL);
-		die("exec failed");
-	}		
-	fd[0] = pipefd[0][0];
-	fd[1] = pipefd[1][1];
-	close(pipefd[0][1]);
-	close(pipefd[1][0]);
+	if (pack_objects_pid < 0)
+		die("pack-objects fork failed");
+	dup2(pipe_fd[1], 1);
+	close(pipe_fd[0]);
+	close(pipe_fd[1]);
+	close(fd);
+	exec_rev_list(refs);
+}
+
+static int pack_objects(int fd, struct ref *refs)
+{
+	pid_t rev_list_pid;
+
+	rev_list_pid = fork();
+	if (!rev_list_pid) {
+		rev_list(fd, refs);
+		die("rev-list setup failed");
+	}
+	if (rev_list_pid < 0)
+		die("rev-list fork failed");
+	/*
+	 * We don't wait for the rev-list pipeline in the parent:
+	 * we end up waiting for the other end instead
+	 */
+	return 0;
+}
+
+static int read_ref(const char *ref, unsigned char *sha1)
+{
+	int fd, ret;
+	char buffer[60];
+
+	fd = open(git_path("%s", ref), O_RDONLY);
+	if (fd < 0)
+		return -1;
+	ret = -1;
+	if (read(fd, buffer, sizeof(buffer)) >= 40)
+		ret = get_sha1_hex(buffer, sha1);
+	close(fd);
+	return ret;
+}
+
+static int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
+{
+	if (!has_sha1_file(old_sha1))
+		return 0;
+	/*
+	 * FIXME! It is not correct to say that the new one is newer
+	 * just because we don't have the old one!
+	 *
+	 * We should really see if we can reach the old_sha1 commit
+	 * from the new_sha1 one.
+	 */
+	return 1;
+}
+
+static int local_ref_nr_match;
+static char **local_ref_match;
+static struct ref **local_ref_list;
+
+static int try_to_match(const char *refname, const unsigned char *sha1)
+{
+	struct ref *ref;
+	int len;
+
+	if (!path_match(refname, local_ref_nr_match, local_ref_match))
+		return 0;
+
+	len = strlen(refname)+1;
+	ref = xmalloc(sizeof(*ref) + len);
+	memset(ref->old_sha1, 0, 20);
+	memcpy(ref->new_sha1, sha1, 20);
+	memcpy(ref->name, refname, len);
+	ref->next = NULL;
+	*local_ref_list = ref;
+	local_ref_list = &ref->next;
+	return 0;
+}
+
+static int send_pack(int in, int out, int nr_match, char **match)
+{
+	struct ref *ref_list = NULL, **last_ref = &ref_list;
+	struct ref *ref;
+	int new_refs;
+
+	/*
+	 * Read all the refs from the other end
+	 */
+	for (;;) {
+		unsigned char old_sha1[20];
+		static char buffer[1000];
+		char *name;
+		int len;
+
+		len = packet_read_line(in, buffer, sizeof(buffer));
+		if (!len)
+			break;
+		if (buffer[len-1] == '\n')
+			buffer[--len] = 0;
+
+		if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
+			die("protocol error: expected sha/ref, got '%s'", buffer);
+		name = buffer + 41;
+		ref = xmalloc(sizeof(*ref) + len - 40);
+		memcpy(ref->old_sha1, old_sha1, 20);
+		memset(ref->new_sha1, 0, 20);
+		memcpy(ref->name, buffer + 41, len - 40);
+		ref->next = NULL;
+		*last_ref = ref;
+		last_ref = &ref->next;
+	}
+
+	/*
+	 * Go through the refs, see if we want to update
+	 * any of them..
+	 */
+	for (ref = ref_list; ref; ref = ref->next) {
+		unsigned char new_sha1[20];
+		char *name = ref->name;
+
+		if (nr_match && !path_match(name, nr_match, match))
+			continue;
+
+		if (read_ref(name, new_sha1) < 0)
+			continue;
+
+		if (!memcmp(ref->old_sha1, new_sha1, 20)) {
+			fprintf(stderr, "'%s' unchanged\n", name);
+			continue;
+		}
+
+		if (!ref_newer(new_sha1, ref->old_sha1)) {
+			error("remote '%s' points to object I don't have", name);
+			continue;
+		}
+
+		/* Ok, mark it for update */
+		memcpy(ref->new_sha1, new_sha1, 20);
+	}
+
+	/*
+	 * See if we have any refs that the other end didn't have
+	 */
+	if (nr_match) {
+		local_ref_nr_match = nr_match;
+		local_ref_match = match;
+		local_ref_list = last_ref;
+		for_each_ref(try_to_match);
+	}
+
+	/*
+	 * Finally, tell the other end!
+	 */
+	new_refs = 0;
+	for (ref = ref_list; ref; ref = ref->next) {
+		char old_hex[60], *new_hex;
+		if (is_zero_sha1(ref->new_sha1))
+			continue;
+		new_refs++;
+		strcpy(old_hex, sha1_to_hex(ref->old_sha1));
+		new_hex = sha1_to_hex(ref->new_sha1);
+		packet_write(out, "%s %s %s", old_hex, new_hex, ref->name);
+		fprintf(stderr, "'%s': updating from %s to %s\n", ref->name, old_hex, new_hex);
+	}
+	
+	packet_flush(out);
+	if (new_refs)
+		pack_objects(out, ref_list);
+	close(out);
 	return 0;
 }
 
@@ -96,7 +256,8 @@ int main(int argc, char **argv)
 	int i, nr_heads = 0;
 	char *dest = NULL;
 	char **heads = NULL;
-	int fd[2];
+	int fd[2], ret;
+	pid_t pid;
 
 	argv++;
 	for (i = 1; i < argc; i++) {
@@ -116,7 +277,12 @@ int main(int argc, char **argv)
 	}
 	if (!dest)
 		usage(send_pack_usage);
-	if (setup_connection(fd, dest, heads))
+	pid = git_connect(fd, dest, exec);
+	if (pid < 0)
 		return 1;
-	return send_pack(fd[0], fd[1]);
+	ret = send_pack(fd[0], fd[1], nr_heads, heads);
+	close(fd[0]);
+	close(fd[1]);
+	finish_connect(pid);
+	return ret;
 }