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