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authorLinus Torvalds <torvalds@g5.osdl.org>2005-07-05 22:45:37 (GMT)
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-05 22:45:37 (GMT)
commit1fcc8ea55d9a126156c037a8c80dc256ceec0855 (patch)
treed11d04785f2546e3328d24b06c4c2a0c8c27b91c
parent2f34ba32dde0131ab280f8ca902f04e39af7dcc0 (diff)
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Add "git-clone-pack" program to help with "git clone"
-rw-r--r--Makefile2
-rw-r--r--clone-pack.c208
2 files changed, 209 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index 233d24a..877d10b 100644
--- a/Makefile
+++ b/Makefile
@@ -43,7 +43,7 @@ PROG= git-update-cache git-diff-files git-init-db git-write-tree \
git-get-tar-commit-id git-apply git-stripspace \
git-diff-stages git-rev-parse git-patch-id git-pack-objects \
git-unpack-objects git-verify-pack git-receive-pack git-send-pack \
- git-prune-packed git-fetch-pack git-upload-pack
+ git-prune-packed git-fetch-pack git-upload-pack git-clone-pack
all: $(PROG)
diff --git a/clone-pack.c b/clone-pack.c
new file mode 100644
index 0000000..0337cec
--- /dev/null
+++ b/clone-pack.c
@@ -0,0 +1,208 @@
+#include "cache.h"
+#include "refs.h"
+#include "pkt-line.h"
+#include <sys/wait.h>
+
+static const char clone_pack_usage[] = "git-clone-pack [host:]directory [heads]*";
+static const char *exec = "git-upload-pack";
+
+struct ref {
+ struct ref *next;
+ unsigned char sha1[20];
+ char name[0];
+};
+
+struct ref *get_remote_refs(int fd, int nr_match, char **match)
+{
+ struct ref *ref_list = NULL, **next_ref = &ref_list;
+
+ for (;;) {
+ static char line[1000];
+ unsigned char sha1[20];
+ struct ref *ref;
+ char *refname;
+ int len;
+
+ len = packet_read_line(fd, line, sizeof(line));
+ if (!len)
+ break;
+ if (line[len-1] == '\n')
+ line[--len] = 0;
+ if (len < 42 || get_sha1_hex(line, sha1))
+ die("git-fetch-pack: protocol error - expected ref descriptor, got '%sĄ'", line);
+ refname = line+41;
+ len = len-40;
+ if (nr_match && !path_match(refname, nr_match, match))
+ continue;
+ ref = xmalloc(sizeof(struct ref) + len);
+ ref->next = NULL;
+ memcpy(ref->sha1, sha1, 20);
+ memcpy(ref->name, refname, len);
+ *next_ref = ref;
+ next_ref = &ref->next;
+ }
+ return ref_list;
+}
+
+static void clone_handshake(int fd[2], struct ref *ref)
+{
+ unsigned char sha1[20];
+
+ while (ref) {
+ packet_write(fd[1], "want %s\n", sha1_to_hex(ref->sha1));
+ ref = ref->next;
+ }
+ packet_flush(fd[1]);
+
+ /* We don't have nuttin' */
+ packet_write(fd[1], "done\n");
+ if (get_ack(fd[0], sha1))
+ error("Huh! git-clone-pack got positive ack for %s", sha1_to_hex(sha1));
+}
+
+static int is_master(struct ref *ref)
+{
+ return !strcmp(ref->name, "refs/heads/master");
+}
+
+static void write_one_ref(struct ref *ref)
+{
+ char *path = git_path(ref->name);
+ int fd = open(path, O_CREAT | O_EXCL | O_WRONLY, 0666);
+ char *hex;
+
+ if (fd < 0)
+ die("unable to create ref %s", ref->name);
+ hex = sha1_to_hex(ref->sha1);
+ hex[40] = '\n';
+ if (write(fd, hex, 41) != 41)
+ die("unable to write ref %s", ref->name);
+ close(fd);
+}
+
+static void write_refs(struct ref *ref)
+{
+ struct ref *head = NULL, *head_ptr, *master_ref;
+ char *head_path;
+
+ if (!strcmp(ref->name, "HEAD")) {
+ head = ref;
+ ref = ref->next;
+ }
+ head_ptr = NULL;
+ master_ref = NULL;
+ while (ref) {
+ if (is_master(ref))
+ master_ref = ref;
+ if (head && !memcmp(ref->sha1, head->sha1, 20)) {
+ if (!head_ptr || ref == master_ref)
+ head_ptr = ref;
+ }
+ write_one_ref(ref);
+ ref = ref->next;
+ }
+ if (!head)
+ return;
+
+ head_path = git_path("HEAD");
+ if (!head_ptr) {
+ /*
+ * If we had a master ref, and it wasn't HEAD, we need to undo the
+ * symlink, and write a standalone HEAD. Give a warning, because that's
+ * really really wrong.
+ */
+ if (master_ref) {
+ error("HEAD doesn't point to any refs! Making standalone HEAD");
+ unlink(head_path);
+ }
+ write_one_ref(head);
+ return;
+ }
+
+ /* We reset to the master branch if it's available */
+ if (master_ref)
+ return;
+
+ /*
+ * Uhhuh. Other end didn't have master. We start HEAD off with
+ * the first branch with the same value.
+ */
+ unlink(head_path);
+ if (symlink(head_ptr->name, head_path) < 0)
+ die("unable to link HEAD to %s", head_ptr->name);
+}
+
+static int clone_pack(int fd[2], int nr_match, char **match)
+{
+ struct ref *refs;
+ int status;
+ pid_t pid;
+
+ refs = get_remote_refs(fd[0], nr_match, match);
+ if (!refs) {
+ packet_flush(fd[1]);
+ die("no matching remote head");
+ }
+ clone_handshake(fd, refs);
+ pid = fork();
+ if (pid < 0)
+ die("git-clone-pack: unable to fork off git-unpack-objects");
+ if (!pid) {
+ close(fd[1]);
+ dup2(fd[0], 0);
+ close(fd[0]);
+ execlp("git-unpack-objects", "git-unpack-objects", NULL);
+ die("git-unpack-objects exec failed");
+ }
+ close(fd[0]);
+ close(fd[1]);
+ while (waitpid(pid, &status, 0) < 0) {
+ if (errno != EINTR)
+ die("waiting for git-unpack-objects: %s", strerror(errno));
+ }
+ if (WIFEXITED(status)) {
+ int code = WEXITSTATUS(status);
+ if (code)
+ die("git-unpack-objects died with error code %d", code);
+ write_refs(refs);
+ return 0;
+ }
+ if (WIFSIGNALED(status)) {
+ int sig = WTERMSIG(status);
+ die("git-unpack-objects died of signal %d", sig);
+ }
+ die("Sherlock Holmes! git-unpack-objects died of unnatural causes %d!", status);
+}
+
+int main(int argc, char **argv)
+{
+ int i, ret, nr_heads;
+ char *dest = NULL, **heads;
+ int fd[2];
+ pid_t pid;
+
+ nr_heads = 0;
+ heads = NULL;
+ for (i = 1; i < argc; i++) {
+ char *arg = argv[i];
+
+ if (*arg == '-') {
+ /* Arguments go here */
+ usage(clone_pack_usage);
+ }
+ dest = arg;
+ heads = argv + i + 1;
+ nr_heads = argc - i - 1;
+ break;
+ }
+ if (!dest)
+ usage(clone_pack_usage);
+ pid = git_connect(fd, dest, exec);
+ if (pid < 0)
+ return 1;
+ ret = clone_pack(fd, nr_heads, heads);
+ close(fd[0]);
+ close(fd[1]);
+ finish_connect(pid);
+ return ret;
+}