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8e49d503 | 1 | #include <stdio.h> |
7dbc2c04 JH |
2 | #include <sys/types.h> |
3 | #include <sys/stat.h> | |
4 | #include <dirent.h> | |
8e49d503 AE |
5 | #include <unistd.h> |
6 | #include <stdlib.h> | |
7 | #include <string.h> | |
8 | #include <errno.h> | |
9 | #include <limits.h> | |
10 | #include <stdarg.h> | |
8e49d503 AE |
11 | |
12 | #ifndef PATH_MAX | |
13 | # define PATH_MAX 4096 | |
14 | #endif | |
15 | ||
16 | static const char git_usage[] = | |
17 | "Usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]"; | |
18 | ||
8e49d503 AE |
19 | /* most gui terms set COLUMNS (although some don't export it) */ |
20 | static int term_columns(void) | |
21 | { | |
22 | char *col_string = getenv("COLUMNS"); | |
23 | int n_cols = 0; | |
24 | ||
25 | if (col_string && (n_cols = atoi(col_string)) > 0) | |
26 | return n_cols; | |
27 | ||
28 | return 80; | |
29 | } | |
30 | ||
7dbc2c04 JH |
31 | static void oom(void) |
32 | { | |
33 | fprintf(stderr, "git: out of memory\n"); | |
34 | exit(1); | |
35 | } | |
36 | ||
8e49d503 AE |
37 | static inline void mput_char(char c, unsigned int num) |
38 | { | |
39 | while(num--) | |
40 | putchar(c); | |
41 | } | |
42 | ||
7dbc2c04 JH |
43 | static struct cmdname { |
44 | size_t len; | |
45 | char name[1]; | |
46 | } **cmdname; | |
47 | static int cmdname_alloc, cmdname_cnt; | |
48 | ||
49 | static void add_cmdname(const char *name, int len) | |
50 | { | |
51 | struct cmdname *ent; | |
52 | if (cmdname_alloc <= cmdname_cnt) { | |
53 | cmdname_alloc = cmdname_alloc + 200; | |
54 | cmdname = realloc(cmdname, cmdname_alloc * sizeof(*cmdname)); | |
55 | if (!cmdname) | |
56 | oom(); | |
57 | } | |
58 | ent = malloc(sizeof(*ent) + len); | |
59 | if (!ent) | |
60 | oom(); | |
61 | ent->len = len; | |
62 | memcpy(ent->name, name, len+1); | |
63 | cmdname[cmdname_cnt++] = ent; | |
64 | } | |
65 | ||
66 | static int cmdname_compare(const void *a_, const void *b_) | |
67 | { | |
68 | struct cmdname *a = *(struct cmdname **)a_; | |
69 | struct cmdname *b = *(struct cmdname **)b_; | |
70 | return strcmp(a->name, b->name); | |
71 | } | |
72 | ||
73 | static void pretty_print_string_list(struct cmdname **cmdname, int longest) | |
8e49d503 AE |
74 | { |
75 | int cols = 1; | |
76 | int space = longest + 1; /* min 1 SP between words */ | |
77 | int max_cols = term_columns() - 1; /* don't print *on* the edge */ | |
7dbc2c04 | 78 | int i; |
8e49d503 AE |
79 | |
80 | if (space < max_cols) | |
81 | cols = max_cols / space; | |
82 | ||
7dbc2c04 JH |
83 | qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare); |
84 | ||
85 | for (i = 0; i < cmdname_cnt; ) { | |
8e49d503 AE |
86 | int c; |
87 | printf(" "); | |
88 | ||
7dbc2c04 JH |
89 | for (c = cols; c && i < cmdname_cnt; i++) { |
90 | printf("%s", cmdname[i]->name); | |
8e49d503 AE |
91 | |
92 | if (--c) | |
7dbc2c04 | 93 | mput_char(' ', space - cmdname[i]->len); |
8e49d503 AE |
94 | } |
95 | putchar('\n'); | |
96 | } | |
97 | } | |
98 | ||
99 | static void list_commands(const char *exec_path, const char *pattern) | |
100 | { | |
7dbc2c04 JH |
101 | unsigned int longest = 0; |
102 | char path[PATH_MAX]; | |
103 | int dirlen; | |
104 | DIR *dir = opendir(exec_path); | |
105 | struct dirent *de; | |
106 | ||
107 | if (!dir) { | |
108 | fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno)); | |
8e49d503 AE |
109 | exit(1); |
110 | } | |
111 | ||
7dbc2c04 JH |
112 | dirlen = strlen(exec_path); |
113 | if (PATH_MAX - 20 < dirlen) { | |
114 | fprintf(stderr, "git: insanely long exec-path '%s'\n", | |
115 | exec_path); | |
8e49d503 AE |
116 | exit(1); |
117 | } | |
118 | ||
7dbc2c04 JH |
119 | memcpy(path, exec_path, dirlen); |
120 | path[dirlen++] = '/'; | |
121 | ||
122 | while ((de = readdir(dir)) != NULL) { | |
123 | struct stat st; | |
124 | int entlen; | |
8e49d503 | 125 | |
7dbc2c04 JH |
126 | if (strncmp(de->d_name, "git-", 4)) |
127 | continue; | |
128 | strcpy(path+dirlen, de->d_name); | |
129 | if (stat(path, &st) || /* stat, not lstat */ | |
130 | !S_ISREG(st.st_mode) || | |
131 | !(st.st_mode & S_IXUSR)) | |
8e49d503 AE |
132 | continue; |
133 | ||
7dbc2c04 | 134 | entlen = strlen(de->d_name); |
8e49d503 | 135 | |
7dbc2c04 JH |
136 | if (longest < entlen) |
137 | longest = entlen; | |
138 | ||
139 | add_cmdname(de->d_name + 4, entlen-4); | |
8e49d503 | 140 | } |
7dbc2c04 | 141 | closedir(dir); |
8e49d503 AE |
142 | |
143 | printf("git commands available in '%s'\n", exec_path); | |
144 | printf("----------------------------"); | |
145 | mput_char('-', strlen(exec_path)); | |
146 | putchar('\n'); | |
7dbc2c04 | 147 | pretty_print_string_list(cmdname, longest - 4); |
8e49d503 AE |
148 | putchar('\n'); |
149 | } | |
150 | ||
151 | #ifdef __GNUC__ | |
152 | static void usage(const char *exec_path, const char *fmt, ...) | |
153 | __attribute__((__format__(__printf__, 2, 3), __noreturn__)); | |
154 | #endif | |
155 | static void usage(const char *exec_path, const char *fmt, ...) | |
156 | { | |
157 | if (fmt) { | |
158 | va_list ap; | |
159 | ||
160 | va_start(ap, fmt); | |
161 | printf("git: "); | |
162 | vprintf(fmt, ap); | |
163 | va_end(ap); | |
164 | putchar('\n'); | |
165 | } | |
166 | else | |
167 | puts(git_usage); | |
168 | ||
169 | putchar('\n'); | |
170 | ||
171 | if(exec_path) | |
172 | list_commands(exec_path, "git-*"); | |
173 | ||
174 | exit(1); | |
175 | } | |
176 | ||
177 | static void prepend_to_path(const char *dir, int len) | |
178 | { | |
179 | char *path, *old_path = getenv("PATH"); | |
180 | int path_len = len; | |
181 | ||
182 | if (!old_path) | |
7dbc2c04 | 183 | old_path = "/usr/local/bin:/usr/bin:/bin"; |
8e49d503 AE |
184 | |
185 | path_len = len + strlen(old_path) + 1; | |
186 | ||
187 | path = malloc(path_len + 1); | |
188 | path[path_len + 1] = '\0'; | |
189 | ||
190 | memcpy(path, dir, len); | |
191 | path[len] = ':'; | |
192 | memcpy(path + len + 1, old_path, path_len - len); | |
193 | ||
194 | setenv("PATH", path, 1); | |
195 | } | |
196 | ||
97fc6c5f AE |
197 | static void show_man_page(char *git_cmd) |
198 | { | |
199 | char *page; | |
200 | ||
201 | if (!strncmp(git_cmd, "git", 3)) | |
202 | page = git_cmd; | |
203 | else { | |
204 | int page_len = strlen(git_cmd) + 4; | |
205 | ||
206 | page = malloc(page_len + 1); | |
207 | strcpy(page, "git-"); | |
208 | strcpy(page + 4, git_cmd); | |
209 | page[page_len] = 0; | |
210 | } | |
211 | ||
7dbc2c04 | 212 | execlp("man", "man", page, NULL); |
97fc6c5f AE |
213 | } |
214 | ||
8e49d503 AE |
215 | int main(int argc, char **argv, char **envp) |
216 | { | |
217 | char git_command[PATH_MAX + 1]; | |
218 | char wd[PATH_MAX + 1]; | |
219 | int i, len, show_help = 0; | |
220 | char *exec_path = getenv("GIT_EXEC_PATH"); | |
221 | ||
222 | getcwd(wd, PATH_MAX); | |
223 | ||
224 | if (!exec_path) | |
225 | exec_path = GIT_EXEC_PATH; | |
226 | ||
227 | for (i = 1; i < argc; i++) { | |
228 | char *arg = argv[i]; | |
229 | ||
230 | if (strncmp(arg, "--", 2)) | |
231 | break; | |
232 | ||
233 | arg += 2; | |
234 | ||
235 | if (!strncmp(arg, "exec-path", 9)) { | |
236 | arg += 9; | |
237 | if (*arg == '=') | |
238 | exec_path = arg + 1; | |
239 | else { | |
240 | puts(exec_path); | |
241 | exit(0); | |
242 | } | |
243 | } | |
244 | else if (!strcmp(arg, "version")) { | |
245 | printf("git version %s\n", GIT_VERSION); | |
246 | exit(0); | |
247 | } | |
248 | else if (!strcmp(arg, "help")) | |
249 | show_help = 1; | |
250 | else if (!show_help) | |
251 | usage(NULL, NULL); | |
252 | } | |
253 | ||
97fc6c5f AE |
254 | if (i >= argc || show_help) { |
255 | if (i >= argc) | |
256 | usage(exec_path, NULL); | |
257 | ||
258 | show_man_page(argv[i]); | |
259 | } | |
8e49d503 | 260 | |
7dbc2c04 JH |
261 | if (*exec_path != '/') { |
262 | if (!getcwd(git_command, sizeof(git_command))) { | |
263 | fprintf(stderr, | |
264 | "git: cannot determine current directory"); | |
265 | exit(1); | |
266 | } | |
267 | len = strlen(git_command); | |
8e49d503 | 268 | |
7dbc2c04 JH |
269 | /* Trivial cleanup */ |
270 | while (!strncmp(exec_path, "./", 2)) { | |
271 | exec_path += 2; | |
272 | while (*exec_path == '/') | |
273 | *exec_path++; | |
274 | } | |
275 | snprintf(git_command + len, sizeof(git_command) - len, | |
276 | "/%s", exec_path); | |
277 | } | |
278 | else | |
279 | strcpy(git_command, exec_path); | |
8e49d503 AE |
280 | len = strlen(git_command); |
281 | prepend_to_path(git_command, len); | |
282 | ||
283 | strncat(&git_command[len], "/git-", sizeof(git_command) - len); | |
284 | len += 5; | |
285 | strncat(&git_command[len], argv[i], sizeof(git_command) - len); | |
286 | ||
287 | if (access(git_command, X_OK)) | |
288 | usage(exec_path, "'%s' is not a git-command", argv[i]); | |
289 | ||
290 | /* execve() can only ever return if it fails */ | |
291 | execve(git_command, &argv[i], envp); | |
292 | printf("Failed to run command '%s': %s\n", git_command, strerror(errno)); | |
293 | ||
294 | return 1; | |
295 | } |