Merge branch 'jc/send-email'
[git] / fetch-clone.c
1 #include "cache.h"
2 #include "exec_cmd.h"
3 #include "pkt-line.h"
4 #include "sideband.h"
5 #include <sys/wait.h>
6 #include <sys/time.h>
7
8 static int finish_pack(const char *pack_tmp_name, const char *me)
9 {
10         int pipe_fd[2];
11         pid_t pid;
12         char idx[PATH_MAX];
13         char final[PATH_MAX];
14         char hash[41];
15         unsigned char sha1[20];
16         char *cp;
17         int err = 0;
18
19         if (pipe(pipe_fd) < 0)
20                 die("%s: unable to set up pipe", me);
21
22         strcpy(idx, pack_tmp_name); /* ".git/objects/pack-XXXXXX" */
23         cp = strrchr(idx, '/');
24         memcpy(cp, "/pidx", 5);
25
26         pid = fork();
27         if (pid < 0)
28                 die("%s: unable to fork off git-index-pack", me);
29         if (!pid) {
30                 close(0);
31                 dup2(pipe_fd[1], 1);
32                 close(pipe_fd[0]);
33                 close(pipe_fd[1]);
34                 execl_git_cmd("index-pack", "-o", idx, pack_tmp_name, NULL);
35                 error("cannot exec git-index-pack <%s> <%s>",
36                       idx, pack_tmp_name);
37                 exit(1);
38         }
39         close(pipe_fd[1]);
40         if (read(pipe_fd[0], hash, 40) != 40) {
41                 error("%s: unable to read from git-index-pack", me);
42                 err = 1;
43         }
44         close(pipe_fd[0]);
45
46         for (;;) {
47                 int status, code;
48
49                 if (waitpid(pid, &status, 0) < 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
98 static 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                 if (recv_sideband(me, xd[0], fd[1], 2))
122                         exit(1);
123                 exit(0);
124         }
125         close(xd[0]);
126         close(fd[1]);
127         fd[1] = xd[1];
128         return side_pid;
129 }
130
131 int receive_unpack_pack(int xd[2], const char *me, int quiet, int sideband)
132 {
133         int status;
134         pid_t pid, side_pid;
135         int fd[2];
136
137         side_pid = setup_sideband(sideband, me, fd, xd);
138         pid = fork();
139         if (pid < 0)
140                 die("%s: unable to fork off git-unpack-objects", me);
141         if (!pid) {
142                 dup2(fd[0], 0);
143                 close(fd[0]);
144                 close(fd[1]);
145                 execl_git_cmd("unpack-objects", quiet ? "-q" : NULL, NULL);
146                 die("git-unpack-objects exec failed");
147         }
148         close(fd[0]);
149         close(fd[1]);
150         while (waitpid(pid, &status, 0) < 0) {
151                 if (errno != EINTR)
152                         die("waiting for git-unpack-objects: %s",
153                             strerror(errno));
154         }
155         if (WIFEXITED(status)) {
156                 int code = WEXITSTATUS(status);
157                 if (code)
158                         die("git-unpack-objects died with error code %d",
159                             code);
160                 return 0;
161         }
162         if (WIFSIGNALED(status)) {
163                 int sig = WTERMSIG(status);
164                 die("git-unpack-objects died of signal %d", sig);
165         }
166         die("git-unpack-objects died of unnatural causes %d", status);
167 }
168
169 /*
170  * We average out the download speed over this many "events", where
171  * an event is a minimum of about half a second. That way, we get
172  * a reasonably stable number.
173  */
174 #define NR_AVERAGE (4)
175
176 /*
177  * A "binary msec" is a power-of-two-msec, aka 1/1024th of a second.
178  * Keeping the time in that format means that "bytes / msecs" means
179  * the same as kB/s (modulo rounding).
180  *
181  * 1000512 is a magic number (usecs in a second, rounded up by half
182  * of 1024, to make "rounding" come out right ;)
183  */
184 #define usec_to_binarymsec(x) ((int)(x) / (1000512 >> 10))
185
186 int receive_keep_pack(int xd[2], const char *me, int quiet, int sideband)
187 {
188         char tmpfile[PATH_MAX];
189         int ofd, ifd, fd[2];
190         unsigned long total;
191         static struct timeval prev_tv;
192         struct average {
193                 unsigned long bytes;
194                 unsigned long time;
195         } download[NR_AVERAGE] = { {0, 0}, };
196         unsigned long avg_bytes, avg_time;
197         int idx = 0;
198
199         setup_sideband(sideband, me, fd, xd);
200
201         ifd = fd[0];
202         snprintf(tmpfile, sizeof(tmpfile),
203                  "%s/pack/tmp-XXXXXX", get_object_directory());
204         ofd = mkstemp(tmpfile);
205         if (ofd < 0)
206                 return error("unable to create temporary file %s", tmpfile);
207
208         gettimeofday(&prev_tv, NULL);
209         total = 0;
210         avg_bytes = 0;
211         avg_time = 0;
212         while (1) {
213                 char buf[8192];
214                 ssize_t sz, wsz, pos;
215                 sz = read(ifd, buf, sizeof(buf));
216                 if (sz == 0)
217                         break;
218                 if (sz < 0) {
219                         if (errno != EINTR && errno != EAGAIN) {
220                                 error("error reading pack (%s)", strerror(errno));
221                                 close(ofd);
222                                 unlink(tmpfile);
223                                 return -1;
224                         }
225                         sz = 0;
226                 }
227                 pos = 0;
228                 while (pos < sz) {
229                         wsz = write(ofd, buf + pos, sz - pos);
230                         if (wsz < 0) {
231                                 error("error writing pack (%s)",
232                                       strerror(errno));
233                                 close(ofd);
234                                 unlink(tmpfile);
235                                 return -1;
236                         }
237                         pos += wsz;
238                 }
239                 total += sz;
240                 if (!quiet) {
241                         static unsigned long last;
242                         struct timeval tv;
243                         unsigned long diff = total - last;
244                         /* not really "msecs", but a power-of-two millisec (1/1024th of a sec) */
245                         unsigned long msecs;
246
247                         gettimeofday(&tv, NULL);
248                         msecs = tv.tv_sec - prev_tv.tv_sec;
249                         msecs <<= 10;
250                         msecs += usec_to_binarymsec(tv.tv_usec - prev_tv.tv_usec);
251
252                         if (msecs > 500) {
253                                 prev_tv = tv;
254                                 last = total;
255
256                                 /* Update averages ..*/
257                                 avg_bytes += diff;
258                                 avg_time += msecs;
259                                 avg_bytes -= download[idx].bytes;
260                                 avg_time -= download[idx].time;
261                                 download[idx].bytes = diff;
262                                 download[idx].time = msecs;
263                                 idx++;
264                                 if (idx >= NR_AVERAGE)
265                                         idx = 0;
266
267                                 fprintf(stderr, "%4lu.%03luMB  (%lu kB/s)      \r",
268                                         total >> 20,
269                                         1000*((total >> 10) & 1023)>>10,
270                                         avg_bytes / avg_time );
271                         }
272                 }
273         }
274         close(ofd);
275         return finish_pack(tmpfile, me);
276 }