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302 lines
6.3 KiB
302 lines
6.3 KiB
#include "cache.h" |
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#include "commit.h" |
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#include "refs.h" |
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#include "pkt-line.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 send_all = 0; |
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static int force_update = 0; |
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static int is_zero_sha1(const unsigned char *sha1) |
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{ |
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int i; |
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for (i = 0; i < 20; i++) { |
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if (*sha1++) |
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return 0; |
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} |
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return 1; |
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} |
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static void exec_pack_objects(void) |
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{ |
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static char *args[] = { |
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"git-pack-objects", |
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"--stdout", |
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NULL |
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}; |
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execvp("git-pack-objects", args); |
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die("git-pack-objects exec failed (%s)", strerror(errno)); |
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} |
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static void exec_rev_list(struct ref *refs) |
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{ |
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static char *args[1000]; |
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int i = 0; |
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args[i++] = "git-rev-list"; /* 0 */ |
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args[i++] = "--objects"; /* 1 */ |
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while (refs) { |
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char *buf = malloc(100); |
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if (i > 900) |
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die("git-rev-list environment overflow"); |
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if (!is_zero_sha1(refs->old_sha1) && |
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has_sha1_file(refs->old_sha1)) { |
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args[i++] = buf; |
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snprintf(buf, 50, "^%s", sha1_to_hex(refs->old_sha1)); |
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buf += 50; |
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} |
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if (!is_zero_sha1(refs->new_sha1)) { |
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args[i++] = buf; |
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snprintf(buf, 50, "%s", sha1_to_hex(refs->new_sha1)); |
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} |
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refs = refs->next; |
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} |
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args[i] = NULL; |
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execvp("git-rev-list", args); |
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die("git-rev-list exec failed (%s)", strerror(errno)); |
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} |
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static void rev_list(int fd, struct ref *refs) |
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{ |
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int pipe_fd[2]; |
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pid_t pack_objects_pid; |
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if (pipe(pipe_fd) < 0) |
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die("rev-list setup: pipe failed"); |
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pack_objects_pid = fork(); |
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if (!pack_objects_pid) { |
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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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exec_pack_objects(); |
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die("pack-objects setup failed"); |
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} |
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if (pack_objects_pid < 0) |
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die("pack-objects fork failed"); |
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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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close(fd); |
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exec_rev_list(refs); |
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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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pid_t rev_list_pid; |
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rev_list_pid = fork(); |
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if (!rev_list_pid) { |
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rev_list(fd, refs); |
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die("rev-list setup failed"); |
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} |
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if (rev_list_pid < 0) |
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die("rev-list fork failed"); |
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/* |
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* We don't wait for the rev-list pipeline in the parent: |
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* we end up waiting for the other end instead |
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*/ |
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return 0; |
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} |
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static int read_ref(const char *ref, unsigned char *sha1) |
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{ |
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int fd, ret; |
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char buffer[60]; |
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fd = open(git_path("%s", ref), O_RDONLY); |
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if (fd < 0) |
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return -1; |
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ret = -1; |
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if (read(fd, buffer, sizeof(buffer)) >= 40) |
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ret = get_sha1_hex(buffer, sha1); |
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close(fd); |
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return ret; |
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} |
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static int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1) |
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{ |
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struct commit *new, *old; |
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struct commit_list *list; |
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if (force_update) |
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return 1; |
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old = lookup_commit_reference(old_sha1); |
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if (!old) |
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return 0; |
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new = lookup_commit_reference(new_sha1); |
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if (!new) |
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return 0; |
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if (parse_commit(new) < 0) |
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return 0; |
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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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if (new == old) |
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return 1; |
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} |
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return 0; |
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} |
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static int local_ref_nr_match; |
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static char **local_ref_match; |
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static struct ref *local_ref_list; |
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static struct ref **local_last_ref; |
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static int try_to_match(const char *refname, const unsigned char *sha1) |
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{ |
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struct ref *ref; |
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int len; |
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if (!path_match(refname, local_ref_nr_match, local_ref_match)) { |
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if (!send_all) |
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return 0; |
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/* If we have it listed already, skip it */ |
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for (ref = local_ref_list ; ref ; ref = ref->next) { |
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if (!strcmp(ref->name, refname)) |
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return 0; |
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} |
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} |
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len = strlen(refname)+1; |
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ref = xmalloc(sizeof(*ref) + len); |
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memset(ref->old_sha1, 0, 20); |
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memcpy(ref->new_sha1, sha1, 20); |
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memcpy(ref->name, refname, len); |
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ref->next = NULL; |
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*local_last_ref = ref; |
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local_last_ref = &ref->next; |
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return 0; |
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} |
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static int send_pack(int in, int out, int nr_match, char **match) |
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{ |
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struct ref *ref_list, **last_ref; |
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struct ref *ref; |
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int new_refs; |
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/* First we get all heads, whether matching or not.. */ |
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last_ref = get_remote_heads(in, &ref_list, 0, NULL); |
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/* |
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* Go through the refs, see if we want to update |
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* any of them.. |
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*/ |
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for (ref = ref_list; ref; ref = ref->next) { |
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unsigned char new_sha1[20]; |
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char *name = ref->name; |
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if (nr_match && !path_match(name, nr_match, match)) |
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continue; |
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if (read_ref(name, new_sha1) < 0) |
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continue; |
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if (!memcmp(ref->old_sha1, new_sha1, 20)) { |
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fprintf(stderr, "'%s' unchanged\n", name); |
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continue; |
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} |
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if (!has_sha1_file(ref->old_sha1)) { |
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error("remote '%s' object %s does not exist on local", |
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name, sha1_to_hex(ref->old_sha1)); |
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continue; |
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} |
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if (!ref_newer(new_sha1, ref->old_sha1)) { |
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error("remote '%s' isn't a strict parent of local", name); |
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continue; |
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} |
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/* Ok, mark it for update */ |
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memcpy(ref->new_sha1, new_sha1, 20); |
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} |
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/* |
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* See if we have any refs that the other end didn't have |
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*/ |
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if (nr_match || send_all) { |
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local_ref_nr_match = nr_match; |
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local_ref_match = match; |
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local_ref_list = ref_list; |
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local_last_ref = last_ref; |
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for_each_ref(try_to_match); |
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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 = ref_list; ref; ref = ref->next) { |
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char old_hex[60], *new_hex; |
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if (is_zero_sha1(ref->new_sha1)) |
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continue; |
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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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packet_write(out, "%s %s %s", old_hex, new_hex, ref->name); |
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fprintf(stderr, "'%s': updating from %s to %s\n", ref->name, old_hex, new_hex); |
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} |
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packet_flush(out); |
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if (new_refs) |
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pack_objects(out, ref_list); |
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close(out); |
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return 0; |
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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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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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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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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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finish_connect(pid); |
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return ret; |
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}
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