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Commit | Line | Data |
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35eb2d36 LT |
1 | #include "cache.h" |
2 | #include "quote.h" | |
77cb17e9 | 3 | #include "exec_cmd.h" |
0c696fe7 | 4 | #include "strbuf.h" |
35eb2d36 | 5 | |
2dbc887e GB |
6 | #define COMMAND_DIR "git-shell-commands" |
7 | ||
35eb2d36 LT |
8 | static int do_generic_cmd(const char *me, char *arg) |
9 | { | |
10 | const char *my_argv[4]; | |
11 | ||
e1464ca7 | 12 | setup_path(); |
ab5f8627 | 13 | if (!arg || !(arg = sq_dequote(arg))) |
35eb2d36 | 14 | die("bad argument"); |
cc44c765 | 15 | if (prefixcmp(me, "git-")) |
77cb17e9 | 16 | die("bad command"); |
35eb2d36 | 17 | |
77cb17e9 | 18 | my_argv[0] = me + 4; |
35eb2d36 LT |
19 | my_argv[1] = arg; |
20 | my_argv[2] = NULL; | |
21 | ||
9201c707 | 22 | return execv_git_cmd(my_argv); |
35eb2d36 LT |
23 | } |
24 | ||
0c696fe7 JS |
25 | static int do_cvs_cmd(const char *me, char *arg) |
26 | { | |
27 | const char *cvsserver_argv[3] = { | |
28 | "cvsserver", "server", NULL | |
29 | }; | |
0c696fe7 JS |
30 | |
31 | if (!arg || strcmp(arg, "server")) | |
32 | die("git-cvsserver only handles server: %s", arg); | |
33 | ||
e1464ca7 | 34 | setup_path(); |
0c696fe7 JS |
35 | return execv_git_cmd(cvsserver_argv); |
36 | } | |
37 | ||
2dbc887e GB |
38 | static int is_valid_cmd_name(const char *cmd) |
39 | { | |
40 | /* Test command contains no . or / characters */ | |
41 | return cmd[strcspn(cmd, "./")] == '\0'; | |
42 | } | |
43 | ||
44 | static char *make_cmd(const char *prog) | |
45 | { | |
46 | char *prefix = xmalloc((strlen(prog) + strlen(COMMAND_DIR) + 2)); | |
47 | strcpy(prefix, COMMAND_DIR); | |
48 | strcat(prefix, "/"); | |
49 | strcat(prefix, prog); | |
50 | return prefix; | |
51 | } | |
52 | ||
53 | static void cd_to_homedir(void) | |
54 | { | |
55 | const char *home = getenv("HOME"); | |
56 | if (!home) | |
57 | die("could not determine user's home directory; HOME is unset"); | |
58 | if (chdir(home) == -1) | |
59 | die("could not chdir to user's home directory"); | |
60 | } | |
0c696fe7 | 61 | |
35eb2d36 LT |
62 | static struct commands { |
63 | const char *name; | |
64 | int (*exec)(const char *me, char *arg); | |
65 | } cmd_list[] = { | |
66 | { "git-receive-pack", do_generic_cmd }, | |
67 | { "git-upload-pack", do_generic_cmd }, | |
79f72b97 | 68 | { "git-upload-archive", do_generic_cmd }, |
0c696fe7 | 69 | { "cvs", do_cvs_cmd }, |
35eb2d36 LT |
70 | { NULL }, |
71 | }; | |
72 | ||
1e7abc59 | 73 | int main(int argc, char **argv) |
35eb2d36 LT |
74 | { |
75 | char *prog; | |
2dbc887e | 76 | const char **user_argv; |
35eb2d36 | 77 | struct commands *cmd; |
0cfeed2e PB |
78 | int devnull_fd; |
79 | ||
80 | /* | |
81 | * Always open file descriptors 0/1/2 to avoid clobbering files | |
82 | * in die(). It also avoids not messing up when the pipes are | |
83 | * dup'ed onto stdin/stdout/stderr in the child processes we spawn. | |
84 | */ | |
85 | devnull_fd = open("/dev/null", O_RDWR); | |
86 | while (devnull_fd >= 0 && devnull_fd <= 2) | |
87 | devnull_fd = dup(devnull_fd); | |
88 | if (devnull_fd == -1) | |
d824cbba | 89 | die_errno("opening /dev/null failed"); |
0cfeed2e | 90 | close (devnull_fd); |
35eb2d36 | 91 | |
bc7c73e2 JH |
92 | /* |
93 | * Special hack to pretend to be a CVS server | |
94 | */ | |
0c696fe7 JS |
95 | if (argc == 2 && !strcmp(argv[1], "cvs server")) |
96 | argv--; | |
bc7c73e2 JH |
97 | |
98 | /* | |
99 | * We do not accept anything but "-c" followed by "cmd arg", | |
100 | * where "cmd" is a very limited subset of git commands. | |
101 | */ | |
0c696fe7 | 102 | else if (argc != 3 || strcmp(argv[1], "-c")) |
35eb2d36 LT |
103 | die("What do you think I am? A shell?"); |
104 | ||
2dbc887e | 105 | prog = xstrdup(argv[2]); |
bc7c73e2 JH |
106 | if (!strncmp(prog, "git", 3) && isspace(prog[3])) |
107 | /* Accept "git foo" as if the caller said "git-foo". */ | |
108 | prog[3] = '-'; | |
109 | ||
35eb2d36 LT |
110 | for (cmd = cmd_list ; cmd->name ; cmd++) { |
111 | int len = strlen(cmd->name); | |
112 | char *arg; | |
113 | if (strncmp(cmd->name, prog, len)) | |
114 | continue; | |
115 | arg = NULL; | |
116 | switch (prog[len]) { | |
117 | case '\0': | |
118 | arg = NULL; | |
119 | break; | |
120 | case ' ': | |
121 | arg = prog + len + 1; | |
122 | break; | |
123 | default: | |
124 | continue; | |
125 | } | |
126 | exit(cmd->exec(cmd->name, arg)); | |
127 | } | |
2dbc887e GB |
128 | |
129 | cd_to_homedir(); | |
130 | if (split_cmdline(prog, &user_argv) != -1) { | |
131 | if (is_valid_cmd_name(user_argv[0])) { | |
132 | prog = make_cmd(user_argv[0]); | |
133 | user_argv[0] = prog; | |
134 | execv(user_argv[0], (char *const *) user_argv); | |
135 | } | |
136 | free(prog); | |
137 | free(user_argv); | |
138 | die("unrecognized command '%s'", argv[2]); | |
139 | } else { | |
140 | free(prog); | |
141 | die("invalid command format '%s'", argv[2]); | |
142 | } | |
35eb2d36 | 143 | } |