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