Make GIT-VERSION-GEN tolerate missing git describe command
[git] / fetch-clone.c
1 #include "cache.h"
2 #include <sys/wait.h>
3
4 static int finish_pack(const char *pack_tmp_name, const char *me)
5 {
6         int pipe_fd[2];
7         pid_t pid;
8         char idx[PATH_MAX];
9         char final[PATH_MAX];
10         char hash[41];
11         unsigned char sha1[20];
12         char *cp;
13         int err = 0;
14
15         if (pipe(pipe_fd) < 0)
16                 die("%s: unable to set up pipe", me);
17
18         strcpy(idx, pack_tmp_name); /* ".git/objects/pack-XXXXXX" */
19         cp = strrchr(idx, '/');
20         memcpy(cp, "/pidx", 5);
21
22         pid = fork();
23         if (pid < 0)
24                 die("git-clone-pack: unable to fork off git-index-pack");
25         if (!pid) {
26                 close(0);
27                 dup2(pipe_fd[1], 1);
28                 close(pipe_fd[0]);
29                 close(pipe_fd[1]);
30                 execlp("git-index-pack","git-index-pack",
31                        "-o", idx, pack_tmp_name, NULL);
32                 error("cannot exec git-index-pack <%s> <%s>",
33                       idx, pack_tmp_name);
34                 exit(1);
35         }
36         close(pipe_fd[1]);
37         if (read(pipe_fd[0], hash, 40) != 40) {
38                 error("%s: unable to read from git-index-pack", me);
39                 err = 1;
40         }
41         close(pipe_fd[0]);
42
43         for (;;) {
44                 int status, code;
45                 int retval = waitpid(pid, &status, 0);
46
47                 if (retval < 0) {
48                         if (errno == EINTR)
49                                 continue;
50                         error("waitpid failed (%s)", strerror(errno));
51                         goto error_die;
52                 }
53                 if (WIFSIGNALED(status)) {
54                         int sig = WTERMSIG(status);
55                         error("git-index-pack died of signal %d", sig);
56                         goto error_die;
57                 }
58                 if (!WIFEXITED(status)) {
59                         error("git-index-pack died of unnatural causes %d",
60                               status);
61                         goto error_die;
62                 }
63                 code = WEXITSTATUS(status);
64                 if (code) {
65                         error("git-index-pack died with error code %d", code);
66                         goto error_die;
67                 }
68                 if (err)
69                         goto error_die;
70                 break;
71         }
72         hash[40] = 0;
73         if (get_sha1_hex(hash, sha1)) {
74                 error("git-index-pack reported nonsense '%s'", hash);
75                 goto error_die;
76         }
77         /* Now we have pack in pack_tmp_name[], and
78          * idx in idx[]; rename them to their final names.
79          */
80         snprintf(final, sizeof(final),
81                  "%s/pack/pack-%s.pack", get_object_directory(), hash);
82         move_temp_to_file(pack_tmp_name, final);
83         chmod(final, 0444);
84         snprintf(final, sizeof(final),
85                  "%s/pack/pack-%s.idx", get_object_directory(), hash);
86         move_temp_to_file(idx, final);
87         chmod(final, 0444);
88         return 0;
89
90  error_die:
91         unlink(idx);
92         unlink(pack_tmp_name);
93         exit(1);
94 }
95
96 int receive_unpack_pack(int fd[2], const char *me, int quiet)
97 {
98         int status;
99         pid_t pid;
100
101         pid = fork();
102         if (pid < 0)
103                 die("%s: unable to fork off git-unpack-objects", me);
104         if (!pid) {
105                 dup2(fd[0], 0);
106                 close(fd[0]);
107                 close(fd[1]);
108                 execlp("git-unpack-objects", "git-unpack-objects",
109                        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 int receive_keep_pack(int fd[2], const char *me)
134 {
135         char tmpfile[PATH_MAX];
136         int ofd, ifd;
137
138         ifd = fd[0];
139         snprintf(tmpfile, sizeof(tmpfile),
140                  "%s/pack/tmp-XXXXXX", get_object_directory());
141         ofd = mkstemp(tmpfile);
142         if (ofd < 0)
143                 return error("unable to create temporary file %s", tmpfile);
144
145         while (1) {
146                 char buf[8192];
147                 ssize_t sz, wsz, pos;
148                 sz = read(ifd, buf, sizeof(buf));
149                 if (sz == 0)
150                         break;
151                 if (sz < 0) {
152                         error("error reading pack (%s)", strerror(errno));
153                         close(ofd);
154                         unlink(tmpfile);
155                         return -1;
156                 }
157                 pos = 0;
158                 while (pos < sz) {
159                         wsz = write(ofd, buf + pos, sz - pos);
160                         if (wsz < 0) {
161                                 error("error writing pack (%s)",
162                                       strerror(errno));
163                                 close(ofd);
164                                 unlink(tmpfile);
165                                 return -1;
166                         }
167                         pos += wsz;
168                 }
169         }
170         close(ofd);
171         return finish_pack(tmpfile, me);
172 }