rebase --root: fix amending root commit messages
[git.git] / shell.c
blob0200d10796c43d6ea1249c314ee158f2b57a481f
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)) || *arg == '-')
17 die("bad argument");
18 if (!starts_with(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 is_valid_cmd_name(const char *cmd)
30 /* Test command contains no . or / characters */
31 return cmd[strcspn(cmd, "./")] == '\0';
34 static char *make_cmd(const char *prog)
36 return xstrfmt("%s/%s", COMMAND_DIR, prog);
39 static void cd_to_homedir(void)
41 const char *home = getenv("HOME");
42 if (!home)
43 die("could not determine user's home directory; HOME is unset");
44 if (chdir(home) == -1)
45 die("could not chdir to user's home directory");
48 static void run_shell(void)
50 int done = 0;
51 static const char *help_argv[] = { HELP_COMMAND, NULL };
53 if (!access(NOLOGIN_COMMAND, F_OK)) {
54 /* Interactive login disabled. */
55 const char *argv[] = { NOLOGIN_COMMAND, NULL };
56 int status;
58 status = run_command_v_opt(argv, 0);
59 if (status < 0)
60 exit(127);
61 exit(status);
64 /* Print help if enabled */
65 run_command_v_opt(help_argv, RUN_SILENT_EXEC_FAILURE);
67 do {
68 struct strbuf line = STRBUF_INIT;
69 const char *prog;
70 char *full_cmd;
71 char *rawargs;
72 char *split_args;
73 const char **argv;
74 int code;
75 int count;
77 fprintf(stderr, "git> ");
78 if (strbuf_getline_lf(&line, stdin) == EOF) {
79 fprintf(stderr, "\n");
80 strbuf_release(&line);
81 break;
83 strbuf_trim(&line);
84 rawargs = strbuf_detach(&line, NULL);
85 split_args = xstrdup(rawargs);
86 count = split_cmdline(split_args, &argv);
87 if (count < 0) {
88 fprintf(stderr, "invalid command format '%s': %s\n", rawargs,
89 split_cmdline_strerror(count));
90 free(split_args);
91 free(rawargs);
92 continue;
95 prog = argv[0];
96 if (!strcmp(prog, "")) {
97 } else if (!strcmp(prog, "quit") || !strcmp(prog, "logout") ||
98 !strcmp(prog, "exit") || !strcmp(prog, "bye")) {
99 done = 1;
100 } else if (is_valid_cmd_name(prog)) {
101 full_cmd = make_cmd(prog);
102 argv[0] = full_cmd;
103 code = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE);
104 if (code == -1 && errno == ENOENT) {
105 fprintf(stderr, "unrecognized command '%s'\n", prog);
107 free(full_cmd);
108 } else {
109 fprintf(stderr, "invalid command format '%s'\n", prog);
112 free(argv);
113 free(rawargs);
114 } while (!done);
117 static struct commands {
118 const char *name;
119 int (*exec)(const char *me, char *arg);
120 } cmd_list[] = {
121 { "git-receive-pack", do_generic_cmd },
122 { "git-upload-pack", do_generic_cmd },
123 { "git-upload-archive", do_generic_cmd },
124 { NULL },
127 int cmd_main(int argc, const char **argv)
129 char *prog;
130 const char **user_argv;
131 struct commands *cmd;
132 int count;
135 * Special hack to pretend to be a CVS server
137 if (argc == 2 && !strcmp(argv[1], "cvs server")) {
138 argv--;
139 } else if (argc == 1) {
140 /* Allow the user to run an interactive shell */
141 cd_to_homedir();
142 if (access(COMMAND_DIR, R_OK | X_OK) == -1) {
143 die("Interactive git shell is not enabled.\n"
144 "hint: ~/" COMMAND_DIR " should exist "
145 "and have read and execute access.");
147 run_shell();
148 exit(0);
149 } else if (argc != 3 || strcmp(argv[1], "-c")) {
151 * We do not accept any other modes except "-c" followed by
152 * "cmd arg", where "cmd" is a very limited subset of git
153 * commands or a command in the COMMAND_DIR
155 die("Run with no arguments or with -c cmd");
158 prog = xstrdup(argv[2]);
159 if (!strncmp(prog, "git", 3) && isspace(prog[3]))
160 /* Accept "git foo" as if the caller said "git-foo". */
161 prog[3] = '-';
163 for (cmd = cmd_list ; cmd->name ; cmd++) {
164 int len = strlen(cmd->name);
165 char *arg;
166 if (strncmp(cmd->name, prog, len))
167 continue;
168 arg = NULL;
169 switch (prog[len]) {
170 case '\0':
171 arg = NULL;
172 break;
173 case ' ':
174 arg = prog + len + 1;
175 break;
176 default:
177 continue;
179 exit(cmd->exec(cmd->name, arg));
182 cd_to_homedir();
183 count = split_cmdline(prog, &user_argv);
184 if (count >= 0) {
185 if (is_valid_cmd_name(user_argv[0])) {
186 prog = make_cmd(user_argv[0]);
187 user_argv[0] = prog;
188 execv(user_argv[0], (char *const *) user_argv);
190 free(prog);
191 free(user_argv);
192 die("unrecognized command '%s'", argv[2]);
193 } else {
194 free(prog);
195 die("invalid command format '%s': %s", argv[2],
196 split_cmdline_strerror(count));