Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "exec_cmd.h"
   3#include "pkt-line.h"
   4#include <sys/wait.h>
   5#include <sys/time.h>
   6
   7static int finish_pack(const char *pack_tmp_name, const char *me)
   8{
   9        int pipe_fd[2];
  10        pid_t pid;
  11        char idx[PATH_MAX];
  12        char final[PATH_MAX];
  13        char hash[41];
  14        unsigned char sha1[20];
  15        char *cp;
  16        int err = 0;
  17
  18        if (pipe(pipe_fd) < 0)
  19                die("%s: unable to set up pipe", me);
  20
  21        strcpy(idx, pack_tmp_name); /* ".git/objects/pack-XXXXXX" */
  22        cp = strrchr(idx, '/');
  23        memcpy(cp, "/pidx", 5);
  24
  25        pid = fork();
  26        if (pid < 0)
  27                die("%s: unable to fork off git-index-pack", me);
  28        if (!pid) {
  29                close(0);
  30                dup2(pipe_fd[1], 1);
  31                close(pipe_fd[0]);
  32                close(pipe_fd[1]);
  33                execl_git_cmd("index-pack", "-o", idx, pack_tmp_name, NULL);
  34                error("cannot exec git-index-pack <%s> <%s>",
  35                      idx, pack_tmp_name);
  36                exit(1);
  37        }
  38        close(pipe_fd[1]);
  39        if (read(pipe_fd[0], hash, 40) != 40) {
  40                error("%s: unable to read from git-index-pack", me);
  41                err = 1;
  42        }
  43        close(pipe_fd[0]);
  44
  45        for (;;) {
  46                int status, code;
  47                int retval = waitpid(pid, &status, 0);
  48
  49                if (retval < 0) {
  50                        if (errno == EINTR)
  51                                continue;
  52                        error("waitpid failed (%s)", strerror(errno));
  53                        goto error_die;
  54                }
  55                if (WIFSIGNALED(status)) {
  56                        int sig = WTERMSIG(status);
  57                        error("git-index-pack died of signal %d", sig);
  58                        goto error_die;
  59                }
  60                if (!WIFEXITED(status)) {
  61                        error("git-index-pack died of unnatural causes %d",
  62                              status);
  63                        goto error_die;
  64                }
  65                code = WEXITSTATUS(status);
  66                if (code) {
  67                        error("git-index-pack died with error code %d", code);
  68                        goto error_die;
  69                }
  70                if (err)
  71                        goto error_die;
  72                break;
  73        }
  74        hash[40] = 0;
  75        if (get_sha1_hex(hash, sha1)) {
  76                error("git-index-pack reported nonsense '%s'", hash);
  77                goto error_die;
  78        }
  79        /* Now we have pack in pack_tmp_name[], and
  80         * idx in idx[]; rename them to their final names.
  81         */
  82        snprintf(final, sizeof(final),
  83                 "%s/pack/pack-%s.pack", get_object_directory(), hash);
  84        move_temp_to_file(pack_tmp_name, final);
  85        chmod(final, 0444);
  86        snprintf(final, sizeof(final),
  87                 "%s/pack/pack-%s.idx", get_object_directory(), hash);
  88        move_temp_to_file(idx, final);
  89        chmod(final, 0444);
  90        return 0;
  91
  92 error_die:
  93        unlink(idx);
  94        unlink(pack_tmp_name);
  95        exit(1);
  96}
  97
  98static pid_t setup_sideband(int sideband, const char *me, int fd[2], int xd[2])
  99{
 100        pid_t side_pid;
 101
 102        if (!sideband) {
 103                fd[0] = xd[0];
 104                fd[1] = xd[1];
 105                return 0;
 106        }
 107        /* xd[] is talking with upload-pack; subprocess reads from
 108         * xd[0], spits out band#2 to stderr, and feeds us band#1
 109         * through our fd[0].
 110         */
 111        if (pipe(fd) < 0)
 112                die("%s: unable to set up pipe", me);
 113        side_pid = fork();
 114        if (side_pid < 0)
 115                die("%s: unable to fork off sideband demultiplexer", me);
 116        if (!side_pid) {
 117                /* subprocess */
 118                close(fd[0]);
 119                if (xd[0] != xd[1])
 120                        close(xd[1]);
 121                while (1) {
 122                        char buf[1024];
 123                        int len = packet_read_line(xd[0], buf, sizeof(buf));
 124                        if (len == 0)
 125                                break;
 126                        if (len < 1)
 127                                die("%s: protocol error: no band designator",
 128                                    me);
 129                        len--;
 130                        switch (buf[0] & 0xFF) {
 131                        case 3:
 132                                safe_write(2, buf+1, len);
 133                                fprintf(stderr, "\n");
 134                                exit(1);
 135                        case 2:
 136                                safe_write(2, buf+1, len);
 137                                continue;
 138                        case 1:
 139                                safe_write(fd[1], buf+1, len);
 140                                continue;
 141                        default:
 142                                die("%s: protocol error: bad band #%d",
 143                                    me, (buf[0] & 0xFF));
 144                        }
 145                }
 146                exit(0);
 147        }
 148        close(xd[0]);
 149        close(fd[1]);
 150        fd[1] = xd[1];
 151        return side_pid;
 152}
 153
 154int receive_unpack_pack(int xd[2], const char *me, int quiet, int sideband)
 155{
 156        int status;
 157        pid_t pid, side_pid;
 158        int fd[2];
 159
 160        side_pid = setup_sideband(sideband, me, fd, xd);
 161        pid = fork();
 162        if (pid < 0)
 163                die("%s: unable to fork off git-unpack-objects", me);
 164        if (!pid) {
 165                dup2(fd[0], 0);
 166                close(fd[0]);
 167                close(fd[1]);
 168                execl_git_cmd("unpack-objects", quiet ? "-q" : NULL, NULL);
 169                die("git-unpack-objects exec failed");
 170        }
 171        close(fd[0]);
 172        close(fd[1]);
 173        while (waitpid(pid, &status, 0) < 0) {
 174                if (errno != EINTR)
 175                        die("waiting for git-unpack-objects: %s",
 176                            strerror(errno));
 177        }
 178        if (WIFEXITED(status)) {
 179                int code = WEXITSTATUS(status);
 180                if (code)
 181                        die("git-unpack-objects died with error code %d",
 182                            code);
 183                return 0;
 184        }
 185        if (WIFSIGNALED(status)) {
 186                int sig = WTERMSIG(status);
 187                die("git-unpack-objects died of signal %d", sig);
 188        }
 189        die("git-unpack-objects died of unnatural causes %d", status);
 190}
 191
 192/*
 193 * We average out the download speed over this many "events", where
 194 * an event is a minimum of about half a second. That way, we get
 195 * a reasonably stable number.
 196 */
 197#define NR_AVERAGE (4)
 198
 199/*
 200 * A "binary msec" is a power-of-two-msec, aka 1/1024th of a second.
 201 * Keeing the time in that format means that "bytes / msecs" means
 202 * is the same as kB/s (modulo rounding).
 203 *
 204 * 1000512 is a magic number (usecs in a second, rounded up by half
 205 * of 1024, to make "rounding" come out right ;)
 206 */
 207#define usec_to_binarymsec(x) ((int)(x) / (1000512 >> 10))
 208
 209int receive_keep_pack(int xd[2], const char *me, int quiet, int sideband)
 210{
 211        char tmpfile[PATH_MAX];
 212        int ofd, ifd, fd[2];
 213        unsigned long total;
 214        static struct timeval prev_tv;
 215        struct average {
 216                unsigned long bytes;
 217                unsigned long time;
 218        } download[NR_AVERAGE] = { {0, 0}, };
 219        unsigned long avg_bytes, avg_time;
 220        int idx = 0;
 221
 222        setup_sideband(sideband, me, fd, xd);
 223
 224        ifd = fd[0];
 225        snprintf(tmpfile, sizeof(tmpfile),
 226                 "%s/pack/tmp-XXXXXX", get_object_directory());
 227        ofd = mkstemp(tmpfile);
 228        if (ofd < 0)
 229                return error("unable to create temporary file %s", tmpfile);
 230
 231        gettimeofday(&prev_tv, NULL);
 232        total = 0;
 233        avg_bytes = 0;
 234        avg_time = 0;
 235        while (1) {
 236                char buf[8192];
 237                ssize_t sz, wsz, pos;
 238                sz = read(ifd, buf, sizeof(buf));
 239                if (sz == 0)
 240                        break;
 241                if (sz < 0) {
 242                        if (errno != EINTR && errno != EAGAIN) {
 243                                error("error reading pack (%s)", strerror(errno));
 244                                close(ofd);
 245                                unlink(tmpfile);
 246                                return -1;
 247                        }
 248                        sz = 0;
 249                }
 250                pos = 0;
 251                while (pos < sz) {
 252                        wsz = write(ofd, buf + pos, sz - pos);
 253                        if (wsz < 0) {
 254                                error("error writing pack (%s)",
 255                                      strerror(errno));
 256                                close(ofd);
 257                                unlink(tmpfile);
 258                                return -1;
 259                        }
 260                        pos += wsz;
 261                }
 262                total += sz;
 263                if (!quiet) {
 264                        static unsigned long last;
 265                        struct timeval tv;
 266                        unsigned long diff = total - last;
 267                        /* not really "msecs", but a power-of-two millisec (1/1024th of a sec) */
 268                        unsigned long msecs;
 269
 270                        gettimeofday(&tv, NULL);
 271                        msecs = tv.tv_sec - prev_tv.tv_sec;
 272                        msecs <<= 10;
 273                        msecs += usec_to_binarymsec(tv.tv_usec - prev_tv.tv_usec);
 274
 275                        if (msecs > 500) {
 276                                prev_tv = tv;
 277                                last = total;
 278
 279                                /* Update averages ..*/
 280                                avg_bytes += diff;
 281                                avg_time += msecs;
 282                                avg_bytes -= download[idx].bytes;
 283                                avg_time -= download[idx].time;
 284                                download[idx].bytes = diff;
 285                                download[idx].time = msecs;
 286                                idx++;
 287                                if (idx >= NR_AVERAGE)
 288                                        idx = 0;
 289
 290                                fprintf(stderr, "%4lu.%03luMB  (%lu kB/s)      \r",
 291                                        total >> 20,
 292                                        1000*((total >> 10) & 1023)>>10,
 293                                        avg_bytes / avg_time );
 294                        }
 295                }
 296        }
 297        close(ofd);
 298        return finish_pack(tmpfile, me);
 299}