contrib/git-svn: tell the user to not modify git-svn-HEAD directly
[git] / fetch-clone.c
1 #include "cache.h"
2 #include "exec_cmd.h"
3 #include <sys/wait.h>
4 #include <sys/time.h>
5
6 static int finish_pack(const char *pack_tmp_name, const char *me)
7 {
8         int pipe_fd[2];
9         pid_t pid;
10         char idx[PATH_MAX];
11         char final[PATH_MAX];
12         char hash[41];
13         unsigned char sha1[20];
14         char *cp;
15         int err = 0;
16
17         if (pipe(pipe_fd) < 0)
18                 die("%s: unable to set up pipe", me);
19
20         strcpy(idx, pack_tmp_name); /* ".git/objects/pack-XXXXXX" */
21         cp = strrchr(idx, '/');
22         memcpy(cp, "/pidx", 5);
23
24         pid = fork();
25         if (pid < 0)
26                 die("git-clone-pack: unable to fork off git-index-pack");
27         if (!pid) {
28                 close(0);
29                 dup2(pipe_fd[1], 1);
30                 close(pipe_fd[0]);
31                 close(pipe_fd[1]);
32                 execl_git_cmd("index-pack", "-o", idx, pack_tmp_name, NULL);
33                 error("cannot exec git-index-pack <%s> <%s>",
34                       idx, pack_tmp_name);
35                 exit(1);
36         }
37         close(pipe_fd[1]);
38         if (read(pipe_fd[0], hash, 40) != 40) {
39                 error("%s: unable to read from git-index-pack", me);
40                 err = 1;
41         }
42         close(pipe_fd[0]);
43
44         for (;;) {
45                 int status, code;
46                 int retval = waitpid(pid, &status, 0);
47
48                 if (retval < 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;
90
91  error_die:
92         unlink(idx);
93         unlink(pack_tmp_name);
94         exit(1);
95 }
96
97 int receive_unpack_pack(int fd[2], const char *me, int quiet)
98 {
99         int status;
100         pid_t pid;
101
102         pid = fork();
103         if (pid < 0)
104                 die("%s: unable to fork off git-unpack-objects", me);
105         if (!pid) {
106                 dup2(fd[0], 0);
107                 close(fd[0]);
108                 close(fd[1]);
109                 execl_git_cmd("unpack-objects", quiet ? "-q" : NULL, NULL);
110                 die("git-unpack-objects exec failed");
111         }
112         close(fd[0]);
113         close(fd[1]);
114         while (waitpid(pid, &status, 0) < 0) {
115                 if (errno != EINTR)
116                         die("waiting for git-unpack-objects: %s",
117                             strerror(errno));
118         }
119         if (WIFEXITED(status)) {
120                 int code = WEXITSTATUS(status);
121                 if (code)
122                         die("git-unpack-objects died with error code %d",
123                             code);
124                 return 0;
125         }
126         if (WIFSIGNALED(status)) {
127                 int sig = WTERMSIG(status);
128                 die("git-unpack-objects died of signal %d", sig);
129         }
130         die("git-unpack-objects died of unnatural causes %d", status);
131 }
132
133 /*
134  * We average out the download speed over this many "events", where
135  * an event is a minimum of about half a second. That way, we get
136  * a reasonably stable number.
137  */
138 #define NR_AVERAGE (4)
139
140 /*
141  * A "binary msec" is a power-of-two-msec, aka 1/1024th of a second.
142  * Keeing the time in that format means that "bytes / msecs" means
143  * is the same as kB/s (modulo rounding).
144  *
145  * 1000512 is a magic number (usecs in a second, rounded up by half
146  * of 1024, to make "rounding" come out right ;)
147  */
148 #define usec_to_binarymsec(x) ((int)(x) / (1000512 >> 10))
149
150 int receive_keep_pack(int fd[2], const char *me, int quiet)
151 {
152         char tmpfile[PATH_MAX];
153         int ofd, ifd;
154         unsigned long total;
155         static struct timeval prev_tv;
156         struct average {
157                 unsigned long bytes;
158                 unsigned long time;
159         } download[NR_AVERAGE] = { {0, 0}, };
160         unsigned long avg_bytes, avg_time;
161         int idx = 0;
162
163         ifd = fd[0];
164         snprintf(tmpfile, sizeof(tmpfile),
165                  "%s/pack/tmp-XXXXXX", get_object_directory());
166         ofd = mkstemp(tmpfile);
167         if (ofd < 0)
168                 return error("unable to create temporary file %s", tmpfile);
169
170         gettimeofday(&prev_tv, NULL);
171         total = 0;
172         avg_bytes = 0;
173         avg_time = 0;
174         while (1) {
175                 char buf[8192];
176                 ssize_t sz, wsz, pos;
177                 sz = read(ifd, buf, sizeof(buf));
178                 if (sz == 0)
179                         break;
180                 if (sz < 0) {
181                         if (errno != EINTR && errno != EAGAIN) {
182                                 error("error reading pack (%s)", strerror(errno));
183                                 close(ofd);
184                                 unlink(tmpfile);
185                                 return -1;
186                         }
187                         sz = 0;
188                 }
189                 pos = 0;
190                 while (pos < sz) {
191                         wsz = write(ofd, buf + pos, sz - pos);
192                         if (wsz < 0) {
193                                 error("error writing pack (%s)",
194                                       strerror(errno));
195                                 close(ofd);
196                                 unlink(tmpfile);
197                                 return -1;
198                         }
199                         pos += wsz;
200                 }
201                 total += sz;
202                 if (!quiet) {
203                         static unsigned long last;
204                         struct timeval tv;
205                         unsigned long diff = total - last;
206                         /* not really "msecs", but a power-of-two millisec (1/1024th of a sec) */
207                         unsigned long msecs;
208
209                         gettimeofday(&tv, NULL);
210                         msecs = tv.tv_sec - prev_tv.tv_sec;
211                         msecs <<= 10;
212                         msecs += usec_to_binarymsec(tv.tv_usec - prev_tv.tv_usec);
213
214                         if (msecs > 500) {
215                                 prev_tv = tv;
216                                 last = total;
217
218                                 /* Update averages ..*/
219                                 avg_bytes += diff;
220                                 avg_time += msecs;
221                                 avg_bytes -= download[idx].bytes;
222                                 avg_time -= download[idx].time;
223                                 download[idx].bytes = diff;
224                                 download[idx].time = msecs;
225                                 idx++;
226                                 if (idx >= NR_AVERAGE)
227                                         idx = 0;
228
229                                 fprintf(stderr, "%4lu.%03luMB  (%lu kB/s)      \r",
230                                         total >> 20,
231                                         1000*((total >> 10) & 1023)>>10,
232                                         avg_bytes / avg_time );
233                         }
234                 }
235         }
236         close(ofd);
237         return finish_pack(tmpfile, me);
238 }