git log -p --merge [[--] paths...]
[git/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>
6
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;
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
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 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
154 int 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
209 int 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 }