fetch-pack: -k option to keep downloaded pack.
Split out the functions that deal with the socketpair after finishing git protocol handshake to receive the packed data into a separate file, and use it in fetch-pack to keep/explode the received pack data. We earlier had something like that on clone-pack side once, but the list discussion resulted in the decision that it makes sense to always keep the pack for clone-pack, so unpacking option is not enabled on the clone-pack side, but we later still could do so easily if we wanted to with this change. Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano
172
fetch-clone.c
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172
fetch-clone.c
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@ -0,0 +1,172 @@
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#include "cache.h"
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#include <sys/wait.h>
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static int finish_pack(const char *pack_tmp_name, const char *me)
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{
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int pipe_fd[2];
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pid_t pid;
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char idx[PATH_MAX];
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char final[PATH_MAX];
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char hash[41];
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unsigned char sha1[20];
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char *cp;
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int err = 0;
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if (pipe(pipe_fd) < 0)
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die("%s: unable to set up pipe", me);
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strcpy(idx, pack_tmp_name); /* ".git/objects/pack-XXXXXX" */
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cp = strrchr(idx, '/');
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memcpy(cp, "/pidx", 5);
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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-index-pack");
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if (!pid) {
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close(0);
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dup2(pipe_fd[1], 1);
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close(pipe_fd[0]);
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close(pipe_fd[1]);
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execlp("git-index-pack","git-index-pack",
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"-o", idx, pack_tmp_name, NULL);
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error("cannot exec git-index-pack <%s> <%s>",
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idx, pack_tmp_name);
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exit(1);
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}
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close(pipe_fd[1]);
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if (read(pipe_fd[0], hash, 40) != 40) {
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error("%s: unable to read from git-index-pack", me);
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err = 1;
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}
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close(pipe_fd[0]);
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for (;;) {
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int status, code;
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int retval = waitpid(pid, &status, 0);
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if (retval < 0) {
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if (errno == EINTR)
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continue;
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error("waitpid failed (%s)", strerror(retval));
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goto error_die;
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}
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if (WIFSIGNALED(status)) {
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int sig = WTERMSIG(status);
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error("git-index-pack died of signal %d", sig);
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goto error_die;
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}
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if (!WIFEXITED(status)) {
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error("git-index-pack died of unnatural causes %d",
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status);
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goto error_die;
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}
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code = WEXITSTATUS(status);
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if (code) {
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error("git-index-pack died with error code %d", code);
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goto error_die;
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}
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if (err)
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goto error_die;
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break;
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}
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hash[40] = 0;
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if (get_sha1_hex(hash, sha1)) {
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error("git-index-pack reported nonsense '%s'", hash);
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goto error_die;
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}
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/* Now we have pack in pack_tmp_name[], and
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* idx in idx[]; rename them to their final names.
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*/
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snprintf(final, sizeof(final),
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"%s/pack/pack-%s.pack", get_object_directory(), hash);
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move_temp_to_file(pack_tmp_name, final);
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chmod(final, 0444);
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snprintf(final, sizeof(final),
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"%s/pack/pack-%s.idx", get_object_directory(), hash);
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move_temp_to_file(idx, final);
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chmod(final, 0444);
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return 0;
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error_die:
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unlink(idx);
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unlink(pack_tmp_name);
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exit(1);
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}
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int receive_unpack_pack(int fd[2], const char *me, int quiet)
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{
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int status;
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pid_t pid;
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pid = fork();
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if (pid < 0)
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die("%s: unable to fork off git-unpack-objects", me);
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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",
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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",
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code);
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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("git-unpack-objects died of unnatural causes %d", status);
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}
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int receive_keep_pack(int fd[2], const char *me)
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{
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char tmpfile[PATH_MAX];
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int ofd, ifd;
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ifd = fd[0];
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snprintf(tmpfile, sizeof(tmpfile),
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"%s/pack/tmp-XXXXXX", get_object_directory());
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ofd = mkstemp(tmpfile);
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if (ofd < 0)
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return error("unable to create temporary file %s", tmpfile);
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while (1) {
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char buf[8192];
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ssize_t sz, wsz, pos;
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sz = read(ifd, buf, sizeof(buf));
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if (sz == 0)
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break;
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if (sz < 0) {
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error("error reading pack (%s)", strerror(errno));
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close(ofd);
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unlink(tmpfile);
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return -1;
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}
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pos = 0;
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while (pos < sz) {
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wsz = write(ofd, buf + pos, sz - pos);
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if (wsz < 0) {
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error("error writing pack (%s)",
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strerror(errno));
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close(ofd);
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unlink(tmpfile);
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return -1;
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}
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pos += wsz;
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}
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}
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close(ofd);
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return finish_pack(tmpfile, me);
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}
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