Add sample commands for git-shell
[git/git.git] / shell.c
CommitLineData
35eb2d36
LT
1#include "cache.h"
2#include "quote.h"
77cb17e9 3#include "exec_cmd.h"
0c696fe7 4#include "strbuf.h"
e69164dd 5#include "run-command.h"
35eb2d36 6
2dbc887e 7#define COMMAND_DIR "git-shell-commands"
e69164dd 8#define HELP_COMMAND COMMAND_DIR "/help"
2dbc887e 9
35eb2d36
LT
10static int do_generic_cmd(const char *me, char *arg)
11{
12 const char *my_argv[4];
13
e1464ca7 14 setup_path();
ab5f8627 15 if (!arg || !(arg = sq_dequote(arg)))
35eb2d36 16 die("bad argument");
cc44c765 17 if (prefixcmp(me, "git-"))
77cb17e9 18 die("bad command");
35eb2d36 19
77cb17e9 20 my_argv[0] = me + 4;
35eb2d36
LT
21 my_argv[1] = arg;
22 my_argv[2] = NULL;
23
9201c707 24 return execv_git_cmd(my_argv);
35eb2d36
LT
25}
26
0c696fe7
JS
27static int do_cvs_cmd(const char *me, char *arg)
28{
29 const char *cvsserver_argv[3] = {
30 "cvsserver", "server", NULL
31 };
0c696fe7
JS
32
33 if (!arg || strcmp(arg, "server"))
34 die("git-cvsserver only handles server: %s", arg);
35
e1464ca7 36 setup_path();
0c696fe7
JS
37 return execv_git_cmd(cvsserver_argv);
38}
39
2dbc887e
GB
40static int is_valid_cmd_name(const char *cmd)
41{
42 /* Test command contains no . or / characters */
43 return cmd[strcspn(cmd, "./")] == '\0';
44}
45
46static char *make_cmd(const char *prog)
47{
48 char *prefix = xmalloc((strlen(prog) + strlen(COMMAND_DIR) + 2));
49 strcpy(prefix, COMMAND_DIR);
50 strcat(prefix, "/");
51 strcat(prefix, prog);
52 return prefix;
53}
54
55static void cd_to_homedir(void)
56{
57 const char *home = getenv("HOME");
58 if (!home)
59 die("could not determine user's home directory; HOME is unset");
60 if (chdir(home) == -1)
61 die("could not chdir to user's home directory");
62}
0c696fe7 63
e69164dd
GB
64static void run_shell(void)
65{
66 int done = 0;
67 static const char *help_argv[] = { HELP_COMMAND, NULL };
68 /* Print help if enabled */
69 run_command_v_opt(help_argv, RUN_SILENT_EXEC_FAILURE);
70
71 do {
72 struct strbuf line = STRBUF_INIT;
73 const char *prog;
74 char *full_cmd;
75 char *rawargs;
76 const char **argv;
77 int code;
78
79 fprintf(stderr, "git> ");
80 if (strbuf_getline(&line, stdin, '\n') == EOF) {
81 fprintf(stderr, "\n");
82 strbuf_release(&line);
83 break;
84 }
85 strbuf_trim(&line);
86 rawargs = strbuf_detach(&line, NULL);
87 if (split_cmdline(rawargs, &argv) == -1) {
88 free(rawargs);
89 continue;
90 }
91
92 prog = argv[0];
93 if (!strcmp(prog, "")) {
94 } else if (!strcmp(prog, "quit") || !strcmp(prog, "logout") ||
95 !strcmp(prog, "exit") || !strcmp(prog, "bye")) {
96 done = 1;
97 } else if (is_valid_cmd_name(prog)) {
98 full_cmd = make_cmd(prog);
99 argv[0] = full_cmd;
100 code = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE);
101 if (code == -1 && errno == ENOENT) {
102 fprintf(stderr, "unrecognized command '%s'\n", prog);
103 }
104 free(full_cmd);
105 } else {
106 fprintf(stderr, "invalid command format '%s'\n", prog);
107 }
108
109 free(argv);
110 free(rawargs);
111 } while (!done);
112}
113
35eb2d36
LT
114static struct commands {
115 const char *name;
116 int (*exec)(const char *me, char *arg);
117} cmd_list[] = {
118 { "git-receive-pack", do_generic_cmd },
119 { "git-upload-pack", do_generic_cmd },
79f72b97 120 { "git-upload-archive", do_generic_cmd },
0c696fe7 121 { "cvs", do_cvs_cmd },
35eb2d36
LT
122 { NULL },
123};
124
1e7abc59 125int main(int argc, char **argv)
35eb2d36
LT
126{
127 char *prog;
2dbc887e 128 const char **user_argv;
35eb2d36 129 struct commands *cmd;
0cfeed2e
PB
130 int devnull_fd;
131
132 /*
133 * Always open file descriptors 0/1/2 to avoid clobbering files
134 * in die(). It also avoids not messing up when the pipes are
135 * dup'ed onto stdin/stdout/stderr in the child processes we spawn.
136 */
137 devnull_fd = open("/dev/null", O_RDWR);
138 while (devnull_fd >= 0 && devnull_fd <= 2)
139 devnull_fd = dup(devnull_fd);
140 if (devnull_fd == -1)
d824cbba 141 die_errno("opening /dev/null failed");
0cfeed2e 142 close (devnull_fd);
35eb2d36 143
bc7c73e2
JH
144 /*
145 * Special hack to pretend to be a CVS server
146 */
e69164dd 147 if (argc == 2 && !strcmp(argv[1], "cvs server")) {
0c696fe7 148 argv--;
e69164dd
GB
149 } else if (argc == 1) {
150 /* Allow the user to run an interactive shell */
151 cd_to_homedir();
152 if (access(COMMAND_DIR, R_OK | X_OK) == -1)
153 die("Sorry, the interactive git-shell is not enabled");
154 run_shell();
155 exit(0);
156 } else if (argc != 3 || strcmp(argv[1], "-c")) {
157 /*
158 * We do not accept any other modes except "-c" followed by
159 * "cmd arg", where "cmd" is a very limited subset of git
160 * commands or a command in the COMMAND_DIR
161 */
162 die("Run with no arguments or with -c cmd");
163 }
35eb2d36 164
2dbc887e 165 prog = xstrdup(argv[2]);
bc7c73e2
JH
166 if (!strncmp(prog, "git", 3) && isspace(prog[3]))
167 /* Accept "git foo" as if the caller said "git-foo". */
168 prog[3] = '-';
169
35eb2d36
LT
170 for (cmd = cmd_list ; cmd->name ; cmd++) {
171 int len = strlen(cmd->name);
172 char *arg;
173 if (strncmp(cmd->name, prog, len))
174 continue;
175 arg = NULL;
176 switch (prog[len]) {
177 case '\0':
178 arg = NULL;
179 break;
180 case ' ':
181 arg = prog + len + 1;
182 break;
183 default:
184 continue;
185 }
186 exit(cmd->exec(cmd->name, arg));
187 }
2dbc887e
GB
188
189 cd_to_homedir();
190 if (split_cmdline(prog, &user_argv) != -1) {
191 if (is_valid_cmd_name(user_argv[0])) {
192 prog = make_cmd(user_argv[0]);
193 user_argv[0] = prog;
194 execv(user_argv[0], (char *const *) user_argv);
195 }
196 free(prog);
197 free(user_argv);
198 die("unrecognized command '%s'", argv[2]);
199 } else {
200 free(prog);
201 die("invalid command format '%s'", argv[2]);
202 }
35eb2d36 203}