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https://github.com/git/git
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![Timo Sirainen](/assets/img/avatar_default.png)
GCC's format __attribute__ is good for checking errors, especially with -Wformat=2 parameter. This fixes most of the reported problems against 2005-08-09 snapshot.
183 lines
4 KiB
C
183 lines
4 KiB
C
#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 int quiet;
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static const char clone_pack_usage[] = "git-clone-pack [-q] [--exec=<git-upload-pack>] [<host>:]<directory> [<heads>]*";
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static const char *exec = "git-upload-pack";
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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->old_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("%s", ref->name);
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int fd;
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char *hex;
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if (safe_create_leading_directories(path))
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die("unable to create leading directory for %s", ref->name);
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fd = open(path, O_CREAT | O_EXCL | O_WRONLY, 0666);
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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->old_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->old_sha1, head->old_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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get_remote_heads(fd[0], &refs, 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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dup2(fd[0], 0);
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close(fd[0]);
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close(fd[1]);
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execlp("git-unpack-objects", "git-unpack-objects",
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quiet ? "-q" : NULL, 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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if (!strcmp("-q", arg)) {
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quiet = 1;
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continue;
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}
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if (!strncmp("--exec=", arg, 7)) {
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exec = arg + 7;
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continue;
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}
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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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