mirror of
https://github.com/git/git.git
synced 2024-11-06 17:23:00 +01:00
825cee7b28
When passing the revisions list to pack-objects we do not check for errors nor short writes. Introduce a new write_in_full which will handle short writes and report errors to the caller. Use this to short cut the send on failure, allowing us to wait for and report the child in case the failure is its fault. Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
424 lines
9.5 KiB
C
424 lines
9.5 KiB
C
#include "cache.h"
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#include "commit.h"
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#include "tag.h"
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#include "refs.h"
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#include "pkt-line.h"
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#include "exec_cmd.h"
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static const char send_pack_usage[] =
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"git-send-pack [--all] [--exec=git-receive-pack] <remote> [<head>...]\n"
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" --all and explicit <head> specification are mutually exclusive.";
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static const char *exec = "git-receive-pack";
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static int verbose;
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static int send_all;
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static int force_update;
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static int use_thin_pack;
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/*
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* Make a pack stream and spit it out into file descriptor fd
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*/
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static int pack_objects(int fd, struct ref *refs)
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{
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int pipe_fd[2];
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pid_t pid;
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if (pipe(pipe_fd) < 0)
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return error("send-pack: pipe failed");
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pid = fork();
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if (!pid) {
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/*
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* The child becomes pack-objects --revs; we feed
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* the revision parameters to it via its stdin and
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* let its stdout go back to the other end.
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*/
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static const char *args[] = {
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"pack-objects",
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"--all-progress",
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"--revs",
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"--stdout",
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NULL,
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NULL,
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};
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if (use_thin_pack)
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args[4] = "--thin";
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dup2(pipe_fd[0], 0);
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dup2(fd, 1);
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close(pipe_fd[0]);
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close(pipe_fd[1]);
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close(fd);
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execv_git_cmd(args);
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die("git-pack-objects exec failed (%s)", strerror(errno));
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}
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/*
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* We feed the pack-objects we just spawned with revision
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* parameters by writing to the pipe.
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*/
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close(pipe_fd[0]);
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close(fd);
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while (refs) {
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char buf[42];
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if (!is_null_sha1(refs->old_sha1) &&
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has_sha1_file(refs->old_sha1)) {
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memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
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buf[0] = '^';
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buf[41] = '\n';
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if (!write_in_full(pipe_fd[1], buf, 42,
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"send-pack: send refs"))
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break;
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}
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if (!is_null_sha1(refs->new_sha1)) {
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memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
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buf[40] = '\n';
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if (!write_in_full(pipe_fd[1], buf, 41,
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"send-pack: send refs"))
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break;
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}
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refs = refs->next;
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}
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close(pipe_fd[1]);
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for (;;) {
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int status, code;
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pid_t waiting = waitpid(pid, &status, 0);
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if (waiting < 0) {
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if (errno == EINTR)
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continue;
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return error("waitpid failed (%s)", strerror(errno));
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}
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if ((waiting != pid) || WIFSIGNALED(status) ||
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!WIFEXITED(status))
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return error("pack-objects died with strange error");
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code = WEXITSTATUS(status);
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if (code)
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return -code;
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return 0;
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}
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}
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static void unmark_and_free(struct commit_list *list, unsigned int mark)
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{
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while (list) {
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struct commit_list *temp = list;
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temp->item->object.flags &= ~mark;
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list = temp->next;
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free(temp);
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}
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}
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static int ref_newer(const unsigned char *new_sha1,
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const unsigned char *old_sha1)
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{
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struct object *o;
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struct commit *old, *new;
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struct commit_list *list, *used;
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int found = 0;
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/* Both new and old must be commit-ish and new is descendant of
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* old. Otherwise we require --force.
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*/
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o = deref_tag(parse_object(old_sha1), NULL, 0);
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if (!o || o->type != OBJ_COMMIT)
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return 0;
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old = (struct commit *) o;
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o = deref_tag(parse_object(new_sha1), NULL, 0);
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if (!o || o->type != OBJ_COMMIT)
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return 0;
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new = (struct commit *) o;
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if (parse_commit(new) < 0)
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return 0;
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used = list = NULL;
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commit_list_insert(new, &list);
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while (list) {
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new = pop_most_recent_commit(&list, 1);
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commit_list_insert(new, &used);
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if (new == old) {
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found = 1;
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break;
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}
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}
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unmark_and_free(list, 1);
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unmark_and_free(used, 1);
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return found;
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}
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static struct ref *local_refs, **local_tail;
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static struct ref *remote_refs, **remote_tail;
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static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
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{
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struct ref *ref;
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int len = strlen(refname) + 1;
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ref = xcalloc(1, sizeof(*ref) + len);
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hashcpy(ref->new_sha1, sha1);
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memcpy(ref->name, refname, len);
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*local_tail = ref;
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local_tail = &ref->next;
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return 0;
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}
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static void get_local_heads(void)
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{
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local_tail = &local_refs;
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for_each_ref(one_local_ref, NULL);
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}
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static int receive_status(int in)
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{
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char line[1000];
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int ret = 0;
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int len = packet_read_line(in, line, sizeof(line));
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if (len < 10 || memcmp(line, "unpack ", 7)) {
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fprintf(stderr, "did not receive status back\n");
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return -1;
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}
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if (memcmp(line, "unpack ok\n", 10)) {
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fputs(line, stderr);
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ret = -1;
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}
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while (1) {
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len = packet_read_line(in, line, sizeof(line));
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if (!len)
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break;
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if (len < 3 ||
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(memcmp(line, "ok", 2) && memcmp(line, "ng", 2))) {
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fprintf(stderr, "protocol error: %s\n", line);
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ret = -1;
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break;
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}
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if (!memcmp(line, "ok", 2))
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continue;
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fputs(line, stderr);
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ret = -1;
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}
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return ret;
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}
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static int send_pack(int in, int out, int nr_refspec, char **refspec)
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{
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struct ref *ref;
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int new_refs;
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int ret = 0;
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int ask_for_status_report = 0;
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int allow_deleting_refs = 0;
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int expect_status_report = 0;
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/* No funny business with the matcher */
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remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
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get_local_heads();
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/* Does the other end support the reporting? */
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if (server_supports("report-status"))
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ask_for_status_report = 1;
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if (server_supports("delete-refs"))
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allow_deleting_refs = 1;
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/* match them up */
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if (!remote_tail)
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remote_tail = &remote_refs;
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if (match_refs(local_refs, remote_refs, &remote_tail,
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nr_refspec, refspec, send_all))
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return -1;
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if (!remote_refs) {
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fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
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return 0;
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}
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/*
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* Finally, tell the other end!
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*/
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new_refs = 0;
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for (ref = remote_refs; ref; ref = ref->next) {
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char old_hex[60], *new_hex;
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int delete_ref;
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if (!ref->peer_ref)
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continue;
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delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
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if (delete_ref && !allow_deleting_refs) {
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error("remote does not support deleting refs");
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ret = -2;
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continue;
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}
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if (!delete_ref &&
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!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
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if (verbose)
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fprintf(stderr, "'%s': up-to-date\n", ref->name);
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continue;
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}
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/* This part determines what can overwrite what.
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* The rules are:
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*
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* (0) you can always use --force or +A:B notation to
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* selectively force individual ref pairs.
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*
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* (1) if the old thing does not exist, it is OK.
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*
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* (2) if you do not have the old thing, you are not allowed
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* to overwrite it; you would not know what you are losing
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* otherwise.
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*
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* (3) if both new and old are commit-ish, and new is a
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* descendant of old, it is OK.
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*
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* (4) regardless of all of the above, removing :B is
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* always allowed.
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*/
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if (!force_update &&
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!delete_ref &&
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!is_null_sha1(ref->old_sha1) &&
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!ref->force) {
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if (!has_sha1_file(ref->old_sha1) ||
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!ref_newer(ref->peer_ref->new_sha1,
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ref->old_sha1)) {
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/* We do not have the remote ref, or
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* we know that the remote ref is not
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* an ancestor of what we are trying to
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* push. Either way this can be losing
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* commits at the remote end and likely
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* we were not up to date to begin with.
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*/
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error("remote '%s' is not a strict "
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"subset of local ref '%s'. "
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"maybe you are not up-to-date and "
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"need to pull first?",
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ref->name,
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ref->peer_ref->name);
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ret = -2;
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continue;
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}
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}
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hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
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if (!delete_ref)
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new_refs++;
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strcpy(old_hex, sha1_to_hex(ref->old_sha1));
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new_hex = sha1_to_hex(ref->new_sha1);
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if (ask_for_status_report) {
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packet_write(out, "%s %s %s%c%s",
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old_hex, new_hex, ref->name, 0,
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"report-status");
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ask_for_status_report = 0;
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expect_status_report = 1;
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}
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else
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packet_write(out, "%s %s %s",
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old_hex, new_hex, ref->name);
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if (delete_ref)
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fprintf(stderr, "deleting '%s'\n", ref->name);
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else {
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fprintf(stderr, "updating '%s'", ref->name);
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if (strcmp(ref->name, ref->peer_ref->name))
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fprintf(stderr, " using '%s'",
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ref->peer_ref->name);
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fprintf(stderr, "\n from %s\n to %s\n",
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old_hex, new_hex);
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}
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}
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packet_flush(out);
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if (new_refs)
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ret = pack_objects(out, remote_refs);
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close(out);
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if (expect_status_report) {
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if (receive_status(in))
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ret = -4;
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}
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if (!new_refs && ret == 0)
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fprintf(stderr, "Everything up-to-date\n");
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return ret;
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}
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static void verify_remote_names(int nr_heads, char **heads)
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{
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int i;
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for (i = 0; i < nr_heads; i++) {
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const char *remote = strchr(heads[i], ':');
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remote = remote ? (remote + 1) : heads[i];
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switch (check_ref_format(remote)) {
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case 0: /* ok */
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case -2: /* ok but a single level -- that is fine for
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* a match pattern.
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*/
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continue;
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}
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die("remote part of refspec is not a valid name in %s",
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heads[i]);
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}
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}
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int main(int argc, char **argv)
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{
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int i, nr_heads = 0;
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char *dest = NULL;
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char **heads = NULL;
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int fd[2], ret;
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pid_t pid;
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setup_git_directory();
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git_config(git_default_config);
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argv++;
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for (i = 1; i < argc; i++, argv++) {
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char *arg = *argv;
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if (*arg == '-') {
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if (!strncmp(arg, "--exec=", 7)) {
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exec = arg + 7;
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continue;
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}
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if (!strcmp(arg, "--all")) {
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send_all = 1;
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continue;
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}
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if (!strcmp(arg, "--force")) {
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force_update = 1;
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continue;
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}
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if (!strcmp(arg, "--verbose")) {
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verbose = 1;
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continue;
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}
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if (!strcmp(arg, "--thin")) {
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use_thin_pack = 1;
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continue;
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}
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usage(send_pack_usage);
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}
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if (!dest) {
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dest = arg;
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continue;
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}
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heads = argv;
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nr_heads = argc - i;
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break;
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}
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if (!dest)
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usage(send_pack_usage);
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if (heads && send_all)
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usage(send_pack_usage);
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verify_remote_names(nr_heads, heads);
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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 = send_pack(fd[0], fd[1], nr_heads, heads);
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close(fd[0]);
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close(fd[1]);
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ret |= finish_connect(pid);
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return !!ret;
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}
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