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![Junio C Hamano](/assets/img/avatar_default.png)
This is a beginning of resurrecting the multi-head pulling support for git-fetch-pack command. The git-fetch-script wrapper still only knows about fetching a single head, without renaming, so it is not very useful unless you directly call git-fetch-pack itself yet. It also fixes a longstanding obsolete description of how the command discovers the list of local commits.
169 lines
3.7 KiB
C
169 lines
3.7 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 int verbose;
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static const char fetch_pack_usage[] =
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"git-fetch-pack [-q] [-v] [--exec=upload-pack] [host:]directory <refs>...";
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static const char *exec = "git-upload-pack";
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static int find_common(int fd[2], unsigned char *result_sha1,
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struct ref *refs)
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{
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static char line[1000];
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int count = 0, flushes = 0, retval;
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FILE *revs;
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revs = popen("git-rev-list $(git-rev-parse --all)", "r");
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if (!revs)
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die("unable to run 'git-rev-list'");
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while (refs) {
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unsigned char *remote = refs->old_sha1;
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if (verbose)
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fprintf(stderr,
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"want %s (%s)\n", sha1_to_hex(remote),
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refs->name);
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packet_write(fd[1], "want %s\n", sha1_to_hex(remote));
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refs = refs->next;
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}
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packet_flush(fd[1]);
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flushes = 1;
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retval = -1;
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while (fgets(line, sizeof(line), revs) != NULL) {
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unsigned char sha1[20];
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if (get_sha1_hex(line, sha1))
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die("git-fetch-pack: expected object name, got crud");
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packet_write(fd[1], "have %s\n", sha1_to_hex(sha1));
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if (verbose)
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fprintf(stderr, "have %s\n", sha1_to_hex(sha1));
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if (!(31 & ++count)) {
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packet_flush(fd[1]);
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flushes++;
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/*
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* We keep one window "ahead" of the other side, and
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* will wait for an ACK only on the next one
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*/
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if (count == 32)
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continue;
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if (get_ack(fd[0], result_sha1)) {
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flushes = 0;
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retval = 0;
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if (verbose)
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fprintf(stderr, "got ack\n");
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break;
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}
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flushes--;
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}
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}
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pclose(revs);
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packet_write(fd[1], "done\n");
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if (verbose)
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fprintf(stderr, "done\n");
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while (flushes) {
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flushes--;
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if (get_ack(fd[0], result_sha1)) {
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if (verbose)
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fprintf(stderr, "got ack\n");
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return 0;
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}
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}
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return retval;
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}
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static int fetch_pack(int fd[2], int nr_match, char **match)
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{
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struct ref *ref;
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unsigned char sha1[20];
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int status;
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pid_t pid;
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get_remote_heads(fd[0], &ref, nr_match, match);
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if (!ref) {
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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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if (find_common(fd, sha1, ref) < 0)
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fprintf(stderr, "warning: no common commits\n");
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pid = fork();
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if (pid < 0)
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die("git-fetch-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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while (ref) {
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printf("%s %s\n",
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sha1_to_hex(ref->old_sha1), ref->name);
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ref = ref->next;
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}
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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 (!strncmp("--exec=", arg, 7)) {
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exec = arg + 7;
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continue;
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}
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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 (!strcmp("-v", arg)) {
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verbose = 1;
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continue;
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}
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usage(fetch_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(fetch_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 = fetch_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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