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#ifndef COUNTERPART_ENV_NAME #define COUNTERPART_ENV_NAME "GIT_SSH_UPLOAD" #endif #ifndef COUNTERPART_PROGRAM_NAME #define COUNTERPART_PROGRAM_NAME "git-ssh-upload" #endif #ifndef MY_PROGRAM_NAME #define MY_PROGRAM_NAME "git-ssh-fetch" #endif #include "cache.h" #include "commit.h" #include "rsh.h" #include "fetch.h" #include "refs.h" static int fd_in; static int fd_out; static unsigned char remote_version; static unsigned char local_version = 1; static int prefetches; static struct object_list *in_transit; static struct object_list **end_of_transit = &in_transit; void prefetch(unsigned char *sha1) { char type = 'o'; struct object_list *node; if (prefetches > 100) { fetch(in_transit->item->sha1); } node = xmalloc(sizeof(struct object_list)); node->next = NULL; node->item = lookup_unknown_object(sha1); *end_of_transit = node; end_of_transit = &node->next; /* XXX: what if these writes fail? */ write_in_full(fd_out, &type, 1); write_in_full(fd_out, sha1, 20); prefetches++; } static char conn_buf[4096]; static size_t conn_buf_posn; int fetch(unsigned char *sha1) { int ret; signed char remote; struct object_list *temp; if (hashcmp(sha1, in_transit->item->sha1)) { /* we must have already fetched it to clean the queue */ return has_sha1_file(sha1) ? 0 : -1; } prefetches--; temp = in_transit; in_transit = in_transit->next; if (!in_transit) end_of_transit = &in_transit; free(temp); if (conn_buf_posn) { remote = conn_buf[0]; memmove(conn_buf, conn_buf + 1, --conn_buf_posn); } else { if (xread(fd_in, &remote, 1) < 1) return -1; } /* fprintf(stderr, "Got %d\n", remote); */ if (remote < 0) return remote; ret = write_sha1_from_fd(sha1, fd_in, conn_buf, 4096, &conn_buf_posn); if (!ret) pull_say("got %s\n", sha1_to_hex(sha1)); return ret; } static int get_version(void) { char type = 'v'; if (write_in_full(fd_out, &type, 1) != 1 || write_in_full(fd_out, &local_version, 1)) { return error("Couldn't request version from remote end"); } if (xread(fd_in, &remote_version, 1) < 1) { return error("Couldn't read version from remote end"); } return 0; } int fetch_ref(char *ref, unsigned char *sha1) { signed char remote; char type = 'r'; int length = strlen(ref) + 1; if (write_in_full(fd_out, &type, 1) != 1 || write_in_full(fd_out, ref, length) != length) return -1; if (read_in_full(fd_in, &remote, 1) != 1) return -1; if (remote < 0) return remote; if (read_in_full(fd_in, sha1, 20) != 20) return -1; return 0; } static const char ssh_fetch_usage[] = MY_PROGRAM_NAME " [-c] [-t] [-a] [-v] [--recover] [-w ref] commit-id url"; int main(int argc, char **argv) { const char *write_ref = NULL; char *commit_id; char *url; int arg = 1; const char *prog; prog = getenv("GIT_SSH_PUSH"); if (!prog) prog = "git-ssh-upload"; setup_git_directory(); git_config(git_default_config); while (arg < argc && argv[arg][0] == '-') { if (argv[arg][1] == 't') { get_tree = 1; } else if (argv[arg][1] == 'c') { get_history = 1; } else if (argv[arg][1] == 'a') { get_all = 1; get_tree = 1; get_history = 1; } else if (argv[arg][1] == 'v') { get_verbosely = 1; } else if (argv[arg][1] == 'w') { write_ref = argv[arg + 1]; arg++; } else if (!strcmp(argv[arg], "--recover")) { get_recover = 1; } arg++; } if (argc < arg + 2) { usage(ssh_fetch_usage); return 1; } commit_id = argv[arg]; url = argv[arg + 1]; if (setup_connection(&fd_in, &fd_out, prog, url, arg, argv + 1)) return 1; if (get_version()) return 1; if (pull(1, &commit_id, &write_ref, url)) return 1; return 0; }
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