Code

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