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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" |
e69164dd | 5 | #include "run-command.h" |
35eb2d36 | 6 | |
2dbc887e | 7 | #define COMMAND_DIR "git-shell-commands" |
e69164dd | 8 | #define HELP_COMMAND COMMAND_DIR "/help" |
35297089 | 9 | #define NOLOGIN_COMMAND COMMAND_DIR "/no-interactive-login" |
2dbc887e | 10 | |
35eb2d36 LT |
11 | static int do_generic_cmd(const char *me, char *arg) |
12 | { | |
13 | const char *my_argv[4]; | |
14 | ||
e1464ca7 | 15 | setup_path(); |
ab5f8627 | 16 | if (!arg || !(arg = sq_dequote(arg))) |
35eb2d36 | 17 | die("bad argument"); |
59556548 | 18 | if (!starts_with(me, "git-")) |
77cb17e9 | 19 | die("bad command"); |
35eb2d36 | 20 | |
77cb17e9 | 21 | my_argv[0] = me + 4; |
35eb2d36 LT |
22 | my_argv[1] = arg; |
23 | my_argv[2] = NULL; | |
24 | ||
9201c707 | 25 | return execv_git_cmd(my_argv); |
35eb2d36 LT |
26 | } |
27 | ||
0c696fe7 JS |
28 | static int do_cvs_cmd(const char *me, char *arg) |
29 | { | |
30 | const char *cvsserver_argv[3] = { | |
31 | "cvsserver", "server", NULL | |
32 | }; | |
0c696fe7 JS |
33 | |
34 | if (!arg || strcmp(arg, "server")) | |
35 | die("git-cvsserver only handles server: %s", arg); | |
36 | ||
e1464ca7 | 37 | setup_path(); |
0c696fe7 JS |
38 | return execv_git_cmd(cvsserver_argv); |
39 | } | |
40 | ||
2dbc887e GB |
41 | static int is_valid_cmd_name(const char *cmd) |
42 | { | |
43 | /* Test command contains no . or / characters */ | |
44 | return cmd[strcspn(cmd, "./")] == '\0'; | |
45 | } | |
46 | ||
47 | static char *make_cmd(const char *prog) | |
48 | { | |
b2724c87 | 49 | return xstrfmt("%s/%s", COMMAND_DIR, prog); |
2dbc887e GB |
50 | } |
51 | ||
52 | static void cd_to_homedir(void) | |
53 | { | |
54 | const char *home = getenv("HOME"); | |
55 | if (!home) | |
56 | die("could not determine user's home directory; HOME is unset"); | |
57 | if (chdir(home) == -1) | |
58 | die("could not chdir to user's home directory"); | |
59 | } | |
0c696fe7 | 60 | |
e69164dd GB |
61 | static void run_shell(void) |
62 | { | |
63 | int done = 0; | |
64 | static const char *help_argv[] = { HELP_COMMAND, NULL }; | |
35297089 JN |
65 | |
66 | if (!access(NOLOGIN_COMMAND, F_OK)) { | |
67 | /* Interactive login disabled. */ | |
68 | const char *argv[] = { NOLOGIN_COMMAND, NULL }; | |
69 | int status; | |
70 | ||
71 | status = run_command_v_opt(argv, 0); | |
72 | if (status < 0) | |
73 | exit(127); | |
74 | exit(status); | |
75 | } | |
76 | ||
e69164dd GB |
77 | /* Print help if enabled */ |
78 | run_command_v_opt(help_argv, RUN_SILENT_EXEC_FAILURE); | |
79 | ||
80 | do { | |
81 | struct strbuf line = STRBUF_INIT; | |
82 | const char *prog; | |
83 | char *full_cmd; | |
84 | char *rawargs; | |
9f29fe9a | 85 | char *split_args; |
e69164dd GB |
86 | const char **argv; |
87 | int code; | |
9f29fe9a | 88 | int count; |
e69164dd GB |
89 | |
90 | fprintf(stderr, "git> "); | |
91 | if (strbuf_getline(&line, stdin, '\n') == EOF) { | |
92 | fprintf(stderr, "\n"); | |
93 | strbuf_release(&line); | |
94 | break; | |
95 | } | |
96 | strbuf_trim(&line); | |
97 | rawargs = strbuf_detach(&line, NULL); | |
9f29fe9a GB |
98 | split_args = xstrdup(rawargs); |
99 | count = split_cmdline(split_args, &argv); | |
100 | if (count < 0) { | |
101 | fprintf(stderr, "invalid command format '%s': %s\n", rawargs, | |
102 | split_cmdline_strerror(count)); | |
103 | free(split_args); | |
e69164dd GB |
104 | free(rawargs); |
105 | continue; | |
106 | } | |
107 | ||
108 | prog = argv[0]; | |
109 | if (!strcmp(prog, "")) { | |
110 | } else if (!strcmp(prog, "quit") || !strcmp(prog, "logout") || | |
111 | !strcmp(prog, "exit") || !strcmp(prog, "bye")) { | |
112 | done = 1; | |
113 | } else if (is_valid_cmd_name(prog)) { | |
114 | full_cmd = make_cmd(prog); | |
115 | argv[0] = full_cmd; | |
116 | code = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE); | |
117 | if (code == -1 && errno == ENOENT) { | |
118 | fprintf(stderr, "unrecognized command '%s'\n", prog); | |
119 | } | |
120 | free(full_cmd); | |
121 | } else { | |
122 | fprintf(stderr, "invalid command format '%s'\n", prog); | |
123 | } | |
124 | ||
125 | free(argv); | |
126 | free(rawargs); | |
127 | } while (!done); | |
128 | } | |
129 | ||
35eb2d36 LT |
130 | static struct commands { |
131 | const char *name; | |
132 | int (*exec)(const char *me, char *arg); | |
133 | } cmd_list[] = { | |
134 | { "git-receive-pack", do_generic_cmd }, | |
135 | { "git-upload-pack", do_generic_cmd }, | |
79f72b97 | 136 | { "git-upload-archive", do_generic_cmd }, |
0c696fe7 | 137 | { "cvs", do_cvs_cmd }, |
35eb2d36 LT |
138 | { NULL }, |
139 | }; | |
140 | ||
1e7abc59 | 141 | int main(int argc, char **argv) |
35eb2d36 LT |
142 | { |
143 | char *prog; | |
2dbc887e | 144 | const char **user_argv; |
35eb2d36 | 145 | struct commands *cmd; |
9f29fe9a | 146 | int count; |
0cfeed2e | 147 | |
5e9637c6 ÆAB |
148 | git_setup_gettext(); |
149 | ||
2d9932cf DS |
150 | git_extract_argv0_path(argv[0]); |
151 | ||
0cfeed2e PB |
152 | /* |
153 | * Always open file descriptors 0/1/2 to avoid clobbering files | |
1d999ddd TR |
154 | * in die(). It also avoids messing up when the pipes are dup'ed |
155 | * onto stdin/stdout/stderr in the child processes we spawn. | |
0cfeed2e | 156 | */ |
1d999ddd | 157 | sanitize_stdfds(); |
35eb2d36 | 158 | |
bc7c73e2 JH |
159 | /* |
160 | * Special hack to pretend to be a CVS server | |
161 | */ | |
e69164dd | 162 | if (argc == 2 && !strcmp(argv[1], "cvs server")) { |
0c696fe7 | 163 | argv--; |
e69164dd GB |
164 | } else if (argc == 1) { |
165 | /* Allow the user to run an interactive shell */ | |
166 | cd_to_homedir(); | |
70256a3a RR |
167 | if (access(COMMAND_DIR, R_OK | X_OK) == -1) { |
168 | die("Interactive git shell is not enabled.\n" | |
169 | "hint: ~/" COMMAND_DIR " should exist " | |
170 | "and have read and execute access."); | |
171 | } | |
e69164dd GB |
172 | run_shell(); |
173 | exit(0); | |
174 | } else if (argc != 3 || strcmp(argv[1], "-c")) { | |
175 | /* | |
176 | * We do not accept any other modes except "-c" followed by | |
177 | * "cmd arg", where "cmd" is a very limited subset of git | |
178 | * commands or a command in the COMMAND_DIR | |
179 | */ | |
180 | die("Run with no arguments or with -c cmd"); | |
181 | } | |
35eb2d36 | 182 | |
2dbc887e | 183 | prog = xstrdup(argv[2]); |
bc7c73e2 JH |
184 | if (!strncmp(prog, "git", 3) && isspace(prog[3])) |
185 | /* Accept "git foo" as if the caller said "git-foo". */ | |
186 | prog[3] = '-'; | |
187 | ||
35eb2d36 LT |
188 | for (cmd = cmd_list ; cmd->name ; cmd++) { |
189 | int len = strlen(cmd->name); | |
190 | char *arg; | |
191 | if (strncmp(cmd->name, prog, len)) | |
192 | continue; | |
193 | arg = NULL; | |
194 | switch (prog[len]) { | |
195 | case '\0': | |
196 | arg = NULL; | |
197 | break; | |
198 | case ' ': | |
199 | arg = prog + len + 1; | |
200 | break; | |
201 | default: | |
202 | continue; | |
203 | } | |
204 | exit(cmd->exec(cmd->name, arg)); | |
205 | } | |
2dbc887e GB |
206 | |
207 | cd_to_homedir(); | |
9f29fe9a GB |
208 | count = split_cmdline(prog, &user_argv); |
209 | if (count >= 0) { | |
2dbc887e GB |
210 | if (is_valid_cmd_name(user_argv[0])) { |
211 | prog = make_cmd(user_argv[0]); | |
212 | user_argv[0] = prog; | |
213 | execv(user_argv[0], (char *const *) user_argv); | |
214 | } | |
215 | free(prog); | |
216 | free(user_argv); | |
217 | die("unrecognized command '%s'", argv[2]); | |
218 | } else { | |
219 | free(prog); | |
9f29fe9a GB |
220 | die("invalid command format '%s': %s", argv[2], |
221 | split_cmdline_strerror(count)); | |
2dbc887e | 222 | } |
35eb2d36 | 223 | } |