300 lines
6.8 KiB
C
300 lines
6.8 KiB
C
#include "cache.h"
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#include "exec_cmd.h"
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#include "pkt-line.h"
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#include <sys/wait.h>
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#include <sys/time.h>
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static int finish_pack(const char *pack_tmp_name, const char *me)
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{
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int pipe_fd[2];
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pid_t pid;
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char idx[PATH_MAX];
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char final[PATH_MAX];
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char hash[41];
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unsigned char sha1[20];
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char *cp;
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int err = 0;
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if (pipe(pipe_fd) < 0)
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die("%s: unable to set up pipe", me);
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strcpy(idx, pack_tmp_name); /* ".git/objects/pack-XXXXXX" */
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cp = strrchr(idx, '/');
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memcpy(cp, "/pidx", 5);
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pid = fork();
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if (pid < 0)
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die("%s: unable to fork off git-index-pack", me);
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if (!pid) {
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close(0);
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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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execl_git_cmd("index-pack", "-o", idx, pack_tmp_name, NULL);
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error("cannot exec git-index-pack <%s> <%s>",
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idx, pack_tmp_name);
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exit(1);
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}
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close(pipe_fd[1]);
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if (read(pipe_fd[0], hash, 40) != 40) {
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error("%s: unable to read from git-index-pack", me);
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err = 1;
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}
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close(pipe_fd[0]);
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for (;;) {
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int status, code;
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int retval = waitpid(pid, &status, 0);
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if (retval < 0) {
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if (errno == EINTR)
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continue;
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error("waitpid failed (%s)", strerror(errno));
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goto error_die;
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}
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if (WIFSIGNALED(status)) {
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int sig = WTERMSIG(status);
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error("git-index-pack died of signal %d", sig);
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goto error_die;
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}
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if (!WIFEXITED(status)) {
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error("git-index-pack died of unnatural causes %d",
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status);
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goto error_die;
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}
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code = WEXITSTATUS(status);
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if (code) {
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error("git-index-pack died with error code %d", code);
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goto error_die;
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}
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if (err)
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goto error_die;
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break;
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}
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hash[40] = 0;
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if (get_sha1_hex(hash, sha1)) {
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error("git-index-pack reported nonsense '%s'", hash);
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goto error_die;
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}
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/* Now we have pack in pack_tmp_name[], and
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* idx in idx[]; rename them to their final names.
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*/
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snprintf(final, sizeof(final),
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"%s/pack/pack-%s.pack", get_object_directory(), hash);
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move_temp_to_file(pack_tmp_name, final);
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chmod(final, 0444);
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snprintf(final, sizeof(final),
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"%s/pack/pack-%s.idx", get_object_directory(), hash);
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move_temp_to_file(idx, final);
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chmod(final, 0444);
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return 0;
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error_die:
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unlink(idx);
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unlink(pack_tmp_name);
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exit(1);
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}
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static pid_t setup_sideband(int sideband, const char *me, int fd[2], int xd[2])
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{
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pid_t side_pid;
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if (!sideband) {
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fd[0] = xd[0];
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fd[1] = xd[1];
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return 0;
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}
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/* xd[] is talking with upload-pack; subprocess reads from
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* xd[0], spits out band#2 to stderr, and feeds us band#1
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* through our fd[0].
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*/
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if (pipe(fd) < 0)
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die("%s: unable to set up pipe", me);
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side_pid = fork();
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if (side_pid < 0)
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die("%s: unable to fork off sideband demultiplexer", me);
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if (!side_pid) {
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/* subprocess */
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close(fd[0]);
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if (xd[0] != xd[1])
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close(xd[1]);
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while (1) {
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char buf[1024];
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int len = packet_read_line(xd[0], buf, sizeof(buf));
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if (len == 0)
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break;
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if (len < 1)
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die("%s: protocol error: no band designator",
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me);
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len--;
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switch (buf[0] & 0xFF) {
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case 3:
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safe_write(2, buf+1, len);
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fprintf(stderr, "\n");
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exit(1);
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case 2:
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safe_write(2, buf+1, len);
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continue;
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case 1:
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safe_write(fd[1], buf+1, len);
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continue;
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default:
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die("%s: protocol error: bad band #%d",
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me, (buf[0] & 0xFF));
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}
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}
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exit(0);
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}
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close(xd[0]);
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close(fd[1]);
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fd[1] = xd[1];
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return side_pid;
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}
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int receive_unpack_pack(int xd[2], const char *me, int quiet, int sideband)
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{
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int status;
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pid_t pid, side_pid;
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int fd[2];
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side_pid = setup_sideband(sideband, me, fd, xd);
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pid = fork();
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if (pid < 0)
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die("%s: unable to fork off git-unpack-objects", me);
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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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execl_git_cmd("unpack-objects", 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",
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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",
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code);
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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("git-unpack-objects died of unnatural causes %d", status);
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}
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/*
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* We average out the download speed over this many "events", where
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* an event is a minimum of about half a second. That way, we get
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* a reasonably stable number.
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*/
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#define NR_AVERAGE (4)
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/*
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* A "binary msec" is a power-of-two-msec, aka 1/1024th of a second.
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* Keeing the time in that format means that "bytes / msecs" means
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* is the same as kB/s (modulo rounding).
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*
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* 1000512 is a magic number (usecs in a second, rounded up by half
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* of 1024, to make "rounding" come out right ;)
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*/
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#define usec_to_binarymsec(x) ((int)(x) / (1000512 >> 10))
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int receive_keep_pack(int xd[2], const char *me, int quiet, int sideband)
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{
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char tmpfile[PATH_MAX];
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int ofd, ifd, fd[2];
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unsigned long total;
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static struct timeval prev_tv;
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struct average {
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unsigned long bytes;
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unsigned long time;
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} download[NR_AVERAGE] = { {0, 0}, };
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unsigned long avg_bytes, avg_time;
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int idx = 0;
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setup_sideband(sideband, me, fd, xd);
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ifd = fd[0];
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snprintf(tmpfile, sizeof(tmpfile),
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"%s/pack/tmp-XXXXXX", get_object_directory());
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ofd = mkstemp(tmpfile);
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if (ofd < 0)
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return error("unable to create temporary file %s", tmpfile);
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gettimeofday(&prev_tv, NULL);
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total = 0;
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avg_bytes = 0;
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avg_time = 0;
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while (1) {
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char buf[8192];
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ssize_t sz, wsz, pos;
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sz = read(ifd, buf, sizeof(buf));
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if (sz == 0)
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break;
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if (sz < 0) {
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if (errno != EINTR && errno != EAGAIN) {
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error("error reading pack (%s)", strerror(errno));
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close(ofd);
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unlink(tmpfile);
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return -1;
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}
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sz = 0;
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}
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pos = 0;
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while (pos < sz) {
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wsz = write(ofd, buf + pos, sz - pos);
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if (wsz < 0) {
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error("error writing pack (%s)",
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strerror(errno));
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close(ofd);
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unlink(tmpfile);
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return -1;
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}
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pos += wsz;
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}
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total += sz;
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if (!quiet) {
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static unsigned long last;
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struct timeval tv;
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unsigned long diff = total - last;
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/* not really "msecs", but a power-of-two millisec (1/1024th of a sec) */
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unsigned long msecs;
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gettimeofday(&tv, NULL);
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msecs = tv.tv_sec - prev_tv.tv_sec;
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msecs <<= 10;
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msecs += usec_to_binarymsec(tv.tv_usec - prev_tv.tv_usec);
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if (msecs > 500) {
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prev_tv = tv;
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last = total;
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/* Update averages ..*/
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avg_bytes += diff;
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avg_time += msecs;
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avg_bytes -= download[idx].bytes;
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avg_time -= download[idx].time;
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download[idx].bytes = diff;
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download[idx].time = msecs;
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idx++;
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if (idx >= NR_AVERAGE)
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idx = 0;
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fprintf(stderr, "%4lu.%03luMB (%lu kB/s) \r",
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total >> 20,
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1000*((total >> 10) & 1023)>>10,
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avg_bytes / avg_time );
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}
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}
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}
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close(ofd);
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return finish_pack(tmpfile, me);
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}
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