Exec git programs without using PATH.
[git/git.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 }