Merge branch 'master' of git://git.kernel.org/pub/scm/git/git
[git/jnareb-git.git] / shell.c
blob1429870a8f29d3d8b8e4d1d7ba3e228d15a73759
1 #include "cache.h"
2 #include "quote.h"
3 #include "exec_cmd.h"
4 #include "strbuf.h"
5 #include "run-command.h"
7 #define COMMAND_DIR "git-shell-commands"
8 #define HELP_COMMAND COMMAND_DIR "/help"
9 #define NOLOGIN_COMMAND COMMAND_DIR "/no-interactive-login"
11 static int do_generic_cmd(const char *me, char *arg)
13 const char *my_argv[4];
15 setup_path();
16 if (!arg || !(arg = sq_dequote(arg)))
17 die("bad argument");
18 if (prefixcmp(me, "git-"))
19 die("bad command");
21 my_argv[0] = me + 4;
22 my_argv[1] = arg;
23 my_argv[2] = NULL;
25 return execv_git_cmd(my_argv);
28 static int do_cvs_cmd(const char *me, char *arg)
30 const char *cvsserver_argv[3] = {
31 "cvsserver", "server", NULL
34 if (!arg || strcmp(arg, "server"))
35 die("git-cvsserver only handles server: %s", arg);
37 setup_path();
38 return execv_git_cmd(cvsserver_argv);
41 static int is_valid_cmd_name(const char *cmd)
43 /* Test command contains no . or / characters */
44 return cmd[strcspn(cmd, "./")] == '\0';
47 static char *make_cmd(const char *prog)
49 char *prefix = xmalloc((strlen(prog) + strlen(COMMAND_DIR) + 2));
50 strcpy(prefix, COMMAND_DIR);
51 strcat(prefix, "/");
52 strcat(prefix, prog);
53 return prefix;
56 static void cd_to_homedir(void)
58 const char *home = getenv("HOME");
59 if (!home)
60 die("could not determine user's home directory; HOME is unset");
61 if (chdir(home) == -1)
62 die("could not chdir to user's home directory");
65 static void run_shell(void)
67 int done = 0;
68 static const char *help_argv[] = { HELP_COMMAND, NULL };
70 if (!access(NOLOGIN_COMMAND, F_OK)) {
71 /* Interactive login disabled. */
72 const char *argv[] = { NOLOGIN_COMMAND, NULL };
73 int status;
75 status = run_command_v_opt(argv, 0);
76 if (status < 0)
77 exit(127);
78 exit(status);
81 /* Print help if enabled */
82 run_command_v_opt(help_argv, RUN_SILENT_EXEC_FAILURE);
84 do {
85 struct strbuf line = STRBUF_INIT;
86 const char *prog;
87 char *full_cmd;
88 char *rawargs;
89 char *split_args;
90 const char **argv;
91 int code;
92 int count;
94 fprintf(stderr, "git> ");
95 if (strbuf_getline(&line, stdin, '\n') == EOF) {
96 fprintf(stderr, "\n");
97 strbuf_release(&line);
98 break;
100 strbuf_trim(&line);
101 rawargs = strbuf_detach(&line, NULL);
102 split_args = xstrdup(rawargs);
103 count = split_cmdline(split_args, &argv);
104 if (count < 0) {
105 fprintf(stderr, "invalid command format '%s': %s\n", rawargs,
106 split_cmdline_strerror(count));
107 free(split_args);
108 free(rawargs);
109 continue;
112 prog = argv[0];
113 if (!strcmp(prog, "")) {
114 } else if (!strcmp(prog, "quit") || !strcmp(prog, "logout") ||
115 !strcmp(prog, "exit") || !strcmp(prog, "bye")) {
116 done = 1;
117 } else if (is_valid_cmd_name(prog)) {
118 full_cmd = make_cmd(prog);
119 argv[0] = full_cmd;
120 code = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE);
121 if (code == -1 && errno == ENOENT) {
122 fprintf(stderr, "unrecognized command '%s'\n", prog);
124 free(full_cmd);
125 } else {
126 fprintf(stderr, "invalid command format '%s'\n", prog);
129 free(argv);
130 free(rawargs);
131 } while (!done);
134 static struct commands {
135 const char *name;
136 int (*exec)(const char *me, char *arg);
137 } cmd_list[] = {
138 { "git-receive-pack", do_generic_cmd },
139 { "git-upload-pack", do_generic_cmd },
140 { "git-upload-archive", do_generic_cmd },
141 { "cvs", do_cvs_cmd },
142 { NULL },
145 int main(int argc, char **argv)
147 char *prog;
148 const char **user_argv;
149 struct commands *cmd;
150 int devnull_fd;
151 int count;
153 git_setup_gettext();
155 git_extract_argv0_path(argv[0]);
158 * Always open file descriptors 0/1/2 to avoid clobbering files
159 * in die(). It also avoids not messing up when the pipes are
160 * dup'ed onto stdin/stdout/stderr in the child processes we spawn.
162 devnull_fd = open("/dev/null", O_RDWR);
163 while (devnull_fd >= 0 && devnull_fd <= 2)
164 devnull_fd = dup(devnull_fd);
165 if (devnull_fd == -1)
166 die_errno("opening /dev/null failed");
167 close (devnull_fd);
170 * Special hack to pretend to be a CVS server
172 if (argc == 2 && !strcmp(argv[1], "cvs server")) {
173 argv--;
174 } else if (argc == 1) {
175 /* Allow the user to run an interactive shell */
176 cd_to_homedir();
177 if (access(COMMAND_DIR, R_OK | X_OK) == -1) {
178 die("Interactive git shell is not enabled.\n"
179 "hint: ~/" COMMAND_DIR " should exist "
180 "and have read and execute access.");
182 run_shell();
183 exit(0);
184 } else if (argc != 3 || strcmp(argv[1], "-c")) {
186 * We do not accept any other modes except "-c" followed by
187 * "cmd arg", where "cmd" is a very limited subset of git
188 * commands or a command in the COMMAND_DIR
190 die("Run with no arguments or with -c cmd");
193 prog = xstrdup(argv[2]);
194 if (!strncmp(prog, "git", 3) && isspace(prog[3]))
195 /* Accept "git foo" as if the caller said "git-foo". */
196 prog[3] = '-';
198 for (cmd = cmd_list ; cmd->name ; cmd++) {
199 int len = strlen(cmd->name);
200 char *arg;
201 if (strncmp(cmd->name, prog, len))
202 continue;
203 arg = NULL;
204 switch (prog[len]) {
205 case '\0':
206 arg = NULL;
207 break;
208 case ' ':
209 arg = prog + len + 1;
210 break;
211 default:
212 continue;
214 exit(cmd->exec(cmd->name, arg));
217 cd_to_homedir();
218 count = split_cmdline(prog, &user_argv);
219 if (count >= 0) {
220 if (is_valid_cmd_name(user_argv[0])) {
221 prog = make_cmd(user_argv[0]);
222 user_argv[0] = prog;
223 execv(user_argv[0], (char *const *) user_argv);
225 free(prog);
226 free(user_argv);
227 die("unrecognized command '%s'", argv[2]);
228 } else {
229 free(prog);
230 die("invalid command format '%s': %s", argv[2],
231 split_cmdline_strerror(count));