rebase --merge: fix for rebasing more than 7 commits.
[git/git.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 }