1 files changed, 170 insertions, 0 deletions
diff --git a/ssh-fetch.c b/ssh-fetch.c
new file mode 100644
index 0000000..bf01fbc
--- /dev/null
+++ b/ssh-fetch.c
@@ -0,0 +1,170 @@
+#ifndef COUNTERPART_ENV_NAME
+#define COUNTERPART_ENV_NAME "GIT_SSH_UPLOAD"
+#endif
+#ifndef COUNTERPART_PROGRAM_NAME
+#define COUNTERPART_PROGRAM_NAME "git-ssh-upload"
+#endif
+#ifndef MY_PROGRAM_NAME
+#define MY_PROGRAM_NAME "git-ssh-fetch"
+#endif
+
+#include "cache.h"
+#include "commit.h"
+#include "rsh.h"
+#include "fetch.h"
+#include "refs.h"
+
+static int fd_in;
+static int fd_out;
+
+static unsigned char remote_version = 0;
+static unsigned char local_version = 1;
+
+static ssize_t force_write(int fd, void *buffer, size_t length)
+{
+	ssize_t ret = 0;
+	while (ret < length) {
+		ssize_t size = write(fd, buffer + ret, length - ret);
+		if (size < 0) {
+			return size;
+		}
+		if (size == 0) {
+			return ret;
+		}
+		ret += size;
+	}
+	return ret;
+}
+
+static int prefetches = 0;
+
+static struct object_list *in_transit = NULL;
+static struct object_list **end_of_transit = &in_transit;
+
+void prefetch(unsigned char *sha1)
+{
+	char type = 'o';
+	struct object_list *node;
+	if (prefetches > 100) {
+		fetch(in_transit->item->sha1);
+	}
+	node = xmalloc(sizeof(struct object_list));
+	node->next = NULL;
+	node->item = lookup_unknown_object(sha1);
+	*end_of_transit = node;
+	end_of_transit = &node->next;
+	force_write(fd_out, &type, 1);
+	force_write(fd_out, sha1, 20);
+	prefetches++;
+}
+
+static char conn_buf[4096];
+static size_t conn_buf_posn = 0;
+
+int fetch(unsigned char *sha1)
+{
+	int ret;
+	signed char remote;
+	struct object_list *temp;
+
+	if (memcmp(sha1, in_transit->item->sha1, 20)) {
+		// we must have already fetched it to clean the queue
+		return has_sha1_file(sha1) ? 0 : -1;
+	}
+	prefetches--;
+	temp = in_transit;
+	in_transit = in_transit->next;
+	if (!in_transit)
+		end_of_transit = &in_transit;
+	free(temp);
+
+	if (conn_buf_posn) {
+		remote = conn_buf[0];
+		memmove(conn_buf, conn_buf + 1, --conn_buf_posn);
+	} else {
+		if (read(fd_in, &remote, 1) < 1)
+			return -1;
+	}
+	//fprintf(stderr, "Got %d\n", remote);
+	if (remote < 0)
+		return remote;
+	ret = write_sha1_from_fd(sha1, fd_in, conn_buf, 4096, &conn_buf_posn);
+	if (!ret)
+		pull_say("got %s\n", sha1_to_hex(sha1));
+	return ret;
+}
+
+static int get_version(void)
+{
+	char type = 'v';
+	write(fd_out, &type, 1);
+	write(fd_out, &local_version, 1);
+	if (read(fd_in, &remote_version, 1) < 1) {
+		return error("Couldn't read version from remote end");
+	}
+	return 0;
+}
+
+int fetch_ref(char *ref, unsigned char *sha1)
+{
+	signed char remote;
+	char type = 'r';
+	write(fd_out, &type, 1);
+	write(fd_out, ref, strlen(ref) + 1);
+	read(fd_in, &remote, 1);
+	if (remote < 0)
+		return remote;
+	read(fd_in, sha1, 20);
+	return 0;
+}
+
+static const char ssh_fetch_usage[] =
+  MY_PROGRAM_NAME
+  " [-c] [-t] [-a] [-v] [-d] [--recover] [-w ref] commit-id url";
+int main(int argc, char **argv)
+{
+	char *commit_id;
+	char *url;
+	int arg = 1;
+	const char *prog;
+
+	prog = getenv("GIT_SSH_PUSH");
+	if (!prog) prog = "git-ssh-upload";
+
+	while (arg < argc && argv[arg][0] == '-') {
+		if (argv[arg][1] == 't') {
+			get_tree = 1;
+		} else if (argv[arg][1] == 'c') {
+			get_history = 1;
+		} else if (argv[arg][1] == 'a') {
+			get_all = 1;
+			get_tree = 1;
+			get_history = 1;
+		} else if (argv[arg][1] == 'v') {
+			get_verbosely = 1;
+		} else if (argv[arg][1] == 'w') {
+			write_ref = argv[arg + 1];
+			arg++;
+		} else if (!strcmp(argv[arg], "--recover")) {
+			get_recover = 1;
+		}
+		arg++;
+	}
+	if (argc < arg + 2) {
+		usage(ssh_fetch_usage);
+		return 1;
+	}
+	commit_id = argv[arg];
+	url = argv[arg + 1];
+
+	if (setup_connection(&fd_in, &fd_out, prog, url, arg, argv + 1))
+		return 1;
+
+	if (get_version())
+		return 1;
+
+	if (pull(commit_id))
+		return 1;
+
+	return 0;
+}