Docs: minor git-push copyediting
[git] / fetch-clone.c
1 #include "cache.h"
2 #include "exec_cmd.h"
3 #include <sys/wait.h>
4
5 static int finish_pack(const char *pack_tmp_name, const char *me)
6 {
7         int pipe_fd[2];
8         pid_t pid;
9         char idx[PATH_MAX];
10         char final[PATH_MAX];
11         char hash[41];
12         unsigned char sha1[20];
13         char *cp;
14         int err = 0;
15
16         if (pipe(pipe_fd) < 0)
17                 die("%s: unable to set up pipe", me);
18
19         strcpy(idx, pack_tmp_name); /* ".git/objects/pack-XXXXXX" */
20         cp = strrchr(idx, '/');
21         memcpy(cp, "/pidx", 5);
22
23         pid = fork();
24         if (pid < 0)
25                 die("git-clone-pack: unable to fork off git-index-pack");
26         if (!pid) {
27                 close(0);
28                 dup2(pipe_fd[1], 1);
29                 close(pipe_fd[0]);
30                 close(pipe_fd[1]);
31                 execl_git_cmd("index-pack", "-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                 execl_git_cmd("unpack-objects", quiet ? "-q" : NULL, NULL);
109                 die("git-unpack-objects exec failed");
110         }
111         close(fd[0]);
112         close(fd[1]);
113         while (waitpid(pid, &status, 0) < 0) {
114                 if (errno != EINTR)
115                         die("waiting for git-unpack-objects: %s",
116                             strerror(errno));
117         }
118         if (WIFEXITED(status)) {
119                 int code = WEXITSTATUS(status);
120                 if (code)
121                         die("git-unpack-objects died with error code %d",
122                             code);
123                 return 0;
124         }
125         if (WIFSIGNALED(status)) {
126                 int sig = WTERMSIG(status);
127                 die("git-unpack-objects died of signal %d", sig);
128         }
129         die("git-unpack-objects died of unnatural causes %d", status);
130 }
131
132 int receive_keep_pack(int fd[2], const char *me)
133 {
134         char tmpfile[PATH_MAX];
135         int ofd, ifd;
136
137         ifd = fd[0];
138         snprintf(tmpfile, sizeof(tmpfile),
139                  "%s/pack/tmp-XXXXXX", get_object_directory());
140         ofd = mkstemp(tmpfile);
141         if (ofd < 0)
142                 return error("unable to create temporary file %s", tmpfile);
143
144         while (1) {
145                 char buf[8192];
146                 ssize_t sz, wsz, pos;
147                 sz = read(ifd, buf, sizeof(buf));
148                 if (sz == 0)
149                         break;
150                 if (sz < 0) {
151                         error("error reading pack (%s)", strerror(errno));
152                         close(ofd);
153                         unlink(tmpfile);
154                         return -1;
155                 }
156                 pos = 0;
157                 while (pos < sz) {
158                         wsz = write(ofd, buf + pos, sz - pos);
159                         if (wsz < 0) {
160                                 error("error writing pack (%s)",
161                                       strerror(errno));
162                                 close(ofd);
163                                 unlink(tmpfile);
164                                 return -1;
165                         }
166                         pos += wsz;
167                 }
168         }
169         close(ofd);
170         return finish_pack(tmpfile, me);
171 }