579 lines
13 KiB
C
579 lines
13 KiB
C
#include <signal.h>
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#include <sys/wait.h>
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#include <sys/poll.h>
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#include "cache.h"
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#include "refs.h"
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#include "pkt-line.h"
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#include "sideband.h"
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#include "tag.h"
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#include "object.h"
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#include "commit.h"
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#include "exec_cmd.h"
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static const char upload_pack_usage[] = "git-upload-pack [--strict] [--timeout=nn] <dir>";
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/* bits #0..7 in revision.h, #8..10 in commit.c */
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#define THEY_HAVE (1u << 11)
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#define OUR_REF (1u << 12)
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#define WANTED (1u << 13)
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#define COMMON_KNOWN (1u << 14)
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#define REACHABLE (1u << 15)
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static unsigned long oldest_have;
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static int multi_ack, nr_our_refs;
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static int use_thin_pack, use_ofs_delta;
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static struct object_array have_obj;
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static struct object_array want_obj;
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static unsigned int timeout;
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/* 0 for no sideband,
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* otherwise maximum packet size (up to 65520 bytes).
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*/
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static int use_sideband;
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static void reset_timeout(void)
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{
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alarm(timeout);
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}
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static int strip(char *line, int len)
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{
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if (len && line[len-1] == '\n')
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line[--len] = 0;
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return len;
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}
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static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
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{
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if (use_sideband)
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return send_sideband(1, fd, data, sz, use_sideband);
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if (fd == 3)
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/* emergency quit */
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fd = 2;
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if (fd == 2) {
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xwrite(fd, data, sz);
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return sz;
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}
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return safe_write(fd, data, sz);
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}
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static void create_pack_file(void)
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{
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/* Pipes between rev-list to pack-objects, pack-objects to us
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* and pack-objects error stream for progress bar.
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*/
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int lp_pipe[2], pu_pipe[2], pe_pipe[2];
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pid_t pid_rev_list, pid_pack_objects;
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int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr);
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char data[8193], progress[128];
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char abort_msg[] = "aborting due to possible repository "
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"corruption on the remote side.";
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int buffered = -1;
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if (pipe(lp_pipe) < 0)
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die("git-upload-pack: unable to create pipe");
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pid_rev_list = fork();
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if (pid_rev_list < 0)
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die("git-upload-pack: unable to fork git-rev-list");
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if (!pid_rev_list) {
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int i;
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int args;
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const char **argv;
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const char **p;
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char *buf;
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if (create_full_pack) {
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args = 10;
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use_thin_pack = 0; /* no point doing it */
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}
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else
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args = have_obj.nr + want_obj.nr + 5;
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p = xmalloc(args * sizeof(char *));
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argv = (const char **) p;
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buf = xmalloc(args * 45);
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dup2(lp_pipe[1], 1);
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close(0);
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close(lp_pipe[0]);
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close(lp_pipe[1]);
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*p++ = "rev-list";
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*p++ = use_thin_pack ? "--objects-edge" : "--objects";
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if (create_full_pack)
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*p++ = "--all";
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else {
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for (i = 0; i < want_obj.nr; i++) {
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struct object *o = want_obj.objects[i].item;
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*p++ = buf;
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memcpy(buf, sha1_to_hex(o->sha1), 41);
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buf += 41;
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}
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}
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if (!create_full_pack)
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for (i = 0; i < have_obj.nr; i++) {
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struct object *o = have_obj.objects[i].item;
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*p++ = buf;
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*buf++ = '^';
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memcpy(buf, sha1_to_hex(o->sha1), 41);
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buf += 41;
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}
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*p++ = NULL;
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execv_git_cmd(argv);
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die("git-upload-pack: unable to exec git-rev-list");
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}
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if (pipe(pu_pipe) < 0)
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die("git-upload-pack: unable to create pipe");
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if (pipe(pe_pipe) < 0)
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die("git-upload-pack: unable to create pipe");
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pid_pack_objects = fork();
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if (pid_pack_objects < 0) {
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/* daemon sets things up to ignore TERM */
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kill(pid_rev_list, SIGKILL);
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die("git-upload-pack: unable to fork git-pack-objects");
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}
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if (!pid_pack_objects) {
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dup2(lp_pipe[0], 0);
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dup2(pu_pipe[1], 1);
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dup2(pe_pipe[1], 2);
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close(lp_pipe[0]);
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close(lp_pipe[1]);
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close(pu_pipe[0]);
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close(pu_pipe[1]);
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close(pe_pipe[0]);
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close(pe_pipe[1]);
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execl_git_cmd("pack-objects", "--stdout", "--progress",
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use_ofs_delta ? "--delta-base-offset" : NULL,
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NULL);
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kill(pid_rev_list, SIGKILL);
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die("git-upload-pack: unable to exec git-pack-objects");
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}
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close(lp_pipe[0]);
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close(lp_pipe[1]);
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/* We read from pe_pipe[0] to capture stderr output for
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* progress bar, and pu_pipe[0] to capture the pack data.
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*/
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close(pe_pipe[1]);
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close(pu_pipe[1]);
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while (1) {
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const char *who;
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struct pollfd pfd[2];
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pid_t pid;
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int status;
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ssize_t sz;
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int pe, pu, pollsize;
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reset_timeout();
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pollsize = 0;
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pe = pu = -1;
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if (0 <= pu_pipe[0]) {
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pfd[pollsize].fd = pu_pipe[0];
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pfd[pollsize].events = POLLIN;
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pu = pollsize;
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pollsize++;
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}
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if (0 <= pe_pipe[0]) {
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pfd[pollsize].fd = pe_pipe[0];
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pfd[pollsize].events = POLLIN;
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pe = pollsize;
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pollsize++;
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}
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if (pollsize) {
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if (poll(pfd, pollsize, -1) < 0) {
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if (errno != EINTR) {
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error("poll failed, resuming: %s",
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strerror(errno));
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sleep(1);
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}
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continue;
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}
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if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
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/* Data ready; we keep the last byte
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* to ourselves in case we detect
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* broken rev-list, so that we can
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* leave the stream corrupted. This
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* is unfortunate -- unpack-objects
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* would happily accept a valid pack
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* data with trailing garbage, so
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* appending garbage after we pass all
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* the pack data is not good enough to
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* signal breakage to downstream.
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*/
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char *cp = data;
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ssize_t outsz = 0;
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if (0 <= buffered) {
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*cp++ = buffered;
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outsz++;
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}
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sz = read(pu_pipe[0], cp,
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sizeof(data) - outsz);
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if (0 < sz)
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;
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else if (sz == 0) {
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close(pu_pipe[0]);
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pu_pipe[0] = -1;
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}
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else
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goto fail;
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sz += outsz;
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if (1 < sz) {
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buffered = data[sz-1] & 0xFF;
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sz--;
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}
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else
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buffered = -1;
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sz = send_client_data(1, data, sz);
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if (sz < 0)
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goto fail;
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}
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if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
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/* Status ready; we ship that in the side-band
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* or dump to the standard error.
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*/
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sz = read(pe_pipe[0], progress,
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sizeof(progress));
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if (0 < sz)
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send_client_data(2, progress, sz);
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else if (sz == 0) {
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close(pe_pipe[0]);
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pe_pipe[0] = -1;
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}
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else
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goto fail;
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}
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}
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/* See if the children are still there */
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if (pid_rev_list || pid_pack_objects) {
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pid = waitpid(-1, &status, WNOHANG);
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if (!pid)
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continue;
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who = ((pid == pid_rev_list) ? "git-rev-list" :
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(pid == pid_pack_objects) ? "git-pack-objects" :
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NULL);
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if (!who) {
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if (pid < 0) {
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error("git-upload-pack: %s",
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strerror(errno));
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goto fail;
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}
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error("git-upload-pack: we weren't "
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"waiting for %d", pid);
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continue;
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}
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if (!WIFEXITED(status) || WEXITSTATUS(status) > 0) {
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error("git-upload-pack: %s died with error.",
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who);
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goto fail;
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}
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if (pid == pid_rev_list)
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pid_rev_list = 0;
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if (pid == pid_pack_objects)
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pid_pack_objects = 0;
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if (pid_rev_list || pid_pack_objects)
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continue;
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}
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/* both died happily */
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if (pollsize)
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continue;
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/* flush the data */
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if (0 <= buffered) {
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data[0] = buffered;
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sz = send_client_data(1, data, 1);
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if (sz < 0)
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goto fail;
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fprintf(stderr, "flushed.\n");
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}
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if (use_sideband)
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packet_flush(1);
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return;
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}
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fail:
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if (pid_pack_objects)
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kill(pid_pack_objects, SIGKILL);
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if (pid_rev_list)
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kill(pid_rev_list, SIGKILL);
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send_client_data(3, abort_msg, sizeof(abort_msg));
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die("git-upload-pack: %s", abort_msg);
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}
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static int got_sha1(char *hex, unsigned char *sha1)
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{
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struct object *o;
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int we_knew_they_have = 0;
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if (get_sha1_hex(hex, sha1))
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die("git-upload-pack: expected SHA1 object, got '%s'", hex);
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if (!has_sha1_file(sha1))
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return -1;
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o = lookup_object(sha1);
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if (!(o && o->parsed))
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o = parse_object(sha1);
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if (!o)
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die("oops (%s)", sha1_to_hex(sha1));
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if (o->type == OBJ_COMMIT) {
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struct commit_list *parents;
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struct commit *commit = (struct commit *)o;
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if (o->flags & THEY_HAVE)
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we_knew_they_have = 1;
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else
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o->flags |= THEY_HAVE;
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if (!oldest_have || (commit->date < oldest_have))
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oldest_have = commit->date;
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for (parents = commit->parents;
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parents;
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parents = parents->next)
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parents->item->object.flags |= THEY_HAVE;
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}
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if (!we_knew_they_have) {
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add_object_array(o, NULL, &have_obj);
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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 reachable(struct commit *want)
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{
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struct commit_list *work = NULL;
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insert_by_date(want, &work);
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while (work) {
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struct commit_list *list = work->next;
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struct commit *commit = work->item;
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free(work);
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work = list;
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if (commit->object.flags & THEY_HAVE) {
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want->object.flags |= COMMON_KNOWN;
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break;
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}
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if (!commit->object.parsed)
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parse_object(commit->object.sha1);
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if (commit->object.flags & REACHABLE)
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continue;
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commit->object.flags |= REACHABLE;
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if (commit->date < oldest_have)
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continue;
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for (list = commit->parents; list; list = list->next) {
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struct commit *parent = list->item;
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if (!(parent->object.flags & REACHABLE))
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insert_by_date(parent, &work);
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}
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}
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want->object.flags |= REACHABLE;
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clear_commit_marks(want, REACHABLE);
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free_commit_list(work);
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return (want->object.flags & COMMON_KNOWN);
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}
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static int ok_to_give_up(void)
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{
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int i;
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if (!have_obj.nr)
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return 0;
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for (i = 0; i < want_obj.nr; i++) {
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struct object *want = want_obj.objects[i].item;
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if (want->flags & COMMON_KNOWN)
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continue;
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want = deref_tag(want, "a want line", 0);
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if (!want || want->type != OBJ_COMMIT) {
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/* no way to tell if this is reachable by
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* looking at the ancestry chain alone, so
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* leave a note to ourselves not to worry about
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* this object anymore.
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*/
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want_obj.objects[i].item->flags |= COMMON_KNOWN;
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continue;
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}
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if (!reachable((struct commit *)want))
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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 int get_common_commits(void)
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{
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static char line[1000];
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unsigned char sha1[20];
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char hex[41], last_hex[41];
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int len;
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track_object_refs = 0;
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save_commit_buffer = 0;
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for(;;) {
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len = packet_read_line(0, line, sizeof(line));
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reset_timeout();
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if (!len) {
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if (have_obj.nr == 0 || multi_ack)
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packet_write(1, "NAK\n");
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continue;
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}
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len = strip(line, len);
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if (!strncmp(line, "have ", 5)) {
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switch (got_sha1(line+5, sha1)) {
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case -1: /* they have what we do not */
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if (multi_ack && ok_to_give_up())
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packet_write(1, "ACK %s continue\n",
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sha1_to_hex(sha1));
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break;
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default:
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memcpy(hex, sha1_to_hex(sha1), 41);
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if (multi_ack) {
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const char *msg = "ACK %s continue\n";
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packet_write(1, msg, hex);
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memcpy(last_hex, hex, 41);
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}
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else if (have_obj.nr == 1)
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packet_write(1, "ACK %s\n", hex);
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break;
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}
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continue;
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}
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if (!strcmp(line, "done")) {
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if (have_obj.nr > 0) {
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if (multi_ack)
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packet_write(1, "ACK %s\n", last_hex);
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return 0;
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}
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packet_write(1, "NAK\n");
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return -1;
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}
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die("git-upload-pack: expected SHA1 list, got '%s'", line);
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}
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}
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static void receive_needs(void)
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{
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static char line[1000];
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int len;
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for (;;) {
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struct object *o;
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unsigned char sha1_buf[20];
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len = packet_read_line(0, line, sizeof(line));
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reset_timeout();
|
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if (!len)
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return;
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|
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if (strncmp("want ", line, 5) ||
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get_sha1_hex(line+5, sha1_buf))
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die("git-upload-pack: protocol error, "
|
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"expected to get sha, not '%s'", line);
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if (strstr(line+45, "multi_ack"))
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multi_ack = 1;
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if (strstr(line+45, "thin-pack"))
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|
use_thin_pack = 1;
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if (strstr(line+45, "ofs-delta"))
|
|
use_ofs_delta = 1;
|
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if (strstr(line+45, "side-band-64k"))
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use_sideband = LARGE_PACKET_MAX;
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|
else if (strstr(line+45, "side-band"))
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use_sideband = DEFAULT_PACKET_MAX;
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|
|
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/* We have sent all our refs already, and the other end
|
|
* should have chosen out of them; otherwise they are
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* asking for nonsense.
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*
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* Hmph. We may later want to allow "want" line that
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* asks for something like "master~10" (symbolic)...
|
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* would it make sense? I don't know.
|
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*/
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o = lookup_object(sha1_buf);
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if (!o || !(o->flags & OUR_REF))
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die("git-upload-pack: not our ref %s", line+5);
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if (!(o->flags & WANTED)) {
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o->flags |= WANTED;
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add_object_array(o, NULL, &want_obj);
|
|
}
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|
}
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|
}
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|
|
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static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
|
|
{
|
|
static const char *capabilities = "multi_ack thin-pack side-band side-band-64k ofs-delta";
|
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struct object *o = parse_object(sha1);
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|
|
|
if (!o)
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die("git-upload-pack: cannot find object %s:", sha1_to_hex(sha1));
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|
|
|
if (capabilities)
|
|
packet_write(1, "%s %s%c%s\n", sha1_to_hex(sha1), refname,
|
|
0, capabilities);
|
|
else
|
|
packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
|
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capabilities = NULL;
|
|
if (!(o->flags & OUR_REF)) {
|
|
o->flags |= OUR_REF;
|
|
nr_our_refs++;
|
|
}
|
|
if (o->type == OBJ_TAG) {
|
|
o = deref_tag(o, refname, 0);
|
|
packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void upload_pack(void)
|
|
{
|
|
reset_timeout();
|
|
head_ref(send_ref, NULL);
|
|
for_each_ref(send_ref, NULL);
|
|
packet_flush(1);
|
|
receive_needs();
|
|
if (want_obj.nr) {
|
|
get_common_commits();
|
|
create_pack_file();
|
|
}
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
char *dir;
|
|
int i;
|
|
int strict = 0;
|
|
|
|
for (i = 1; i < argc; i++) {
|
|
char *arg = argv[i];
|
|
|
|
if (arg[0] != '-')
|
|
break;
|
|
if (!strcmp(arg, "--strict")) {
|
|
strict = 1;
|
|
continue;
|
|
}
|
|
if (!strncmp(arg, "--timeout=", 10)) {
|
|
timeout = atoi(arg+10);
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--")) {
|
|
i++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (i != argc-1)
|
|
usage(upload_pack_usage);
|
|
dir = argv[i];
|
|
|
|
if (!enter_repo(dir, strict))
|
|
die("'%s': unable to chdir or not a git archive", dir);
|
|
|
|
upload_pack();
|
|
return 0;
|
|
}
|