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Commit | Line | Data |
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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> | |
ea77e675 | 11 | #include <sys/ioctl.h> |
4050c0df | 12 | #include "git-compat-util.h" |
8e49d503 AE |
13 | |
14 | #ifndef PATH_MAX | |
15 | # define PATH_MAX 4096 | |
16 | #endif | |
17 | ||
18 | static const char git_usage[] = | |
19 | "Usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]"; | |
20 | ||
8e49d503 AE |
21 | /* most gui terms set COLUMNS (although some don't export it) */ |
22 | static int term_columns(void) | |
23 | { | |
24 | char *col_string = getenv("COLUMNS"); | |
25 | int n_cols = 0; | |
26 | ||
27 | if (col_string && (n_cols = atoi(col_string)) > 0) | |
28 | return n_cols; | |
29 | ||
ea77e675 LT |
30 | #ifdef TIOCGWINSZ |
31 | { | |
32 | struct winsize ws; | |
33 | if (!ioctl(1, TIOCGWINSZ, &ws)) { | |
34 | if (ws.ws_col) | |
35 | return ws.ws_col; | |
36 | } | |
37 | } | |
38 | #endif | |
39 | ||
8e49d503 AE |
40 | return 80; |
41 | } | |
42 | ||
7dbc2c04 JH |
43 | static void oom(void) |
44 | { | |
45 | fprintf(stderr, "git: out of memory\n"); | |
46 | exit(1); | |
47 | } | |
48 | ||
8e49d503 AE |
49 | static inline void mput_char(char c, unsigned int num) |
50 | { | |
51 | while(num--) | |
52 | putchar(c); | |
53 | } | |
54 | ||
7dbc2c04 JH |
55 | static struct cmdname { |
56 | size_t len; | |
57 | char name[1]; | |
58 | } **cmdname; | |
59 | static int cmdname_alloc, cmdname_cnt; | |
60 | ||
61 | static void add_cmdname(const char *name, int len) | |
62 | { | |
63 | struct cmdname *ent; | |
64 | if (cmdname_alloc <= cmdname_cnt) { | |
65 | cmdname_alloc = cmdname_alloc + 200; | |
66 | cmdname = realloc(cmdname, cmdname_alloc * sizeof(*cmdname)); | |
67 | if (!cmdname) | |
68 | oom(); | |
69 | } | |
70 | ent = malloc(sizeof(*ent) + len); | |
71 | if (!ent) | |
72 | oom(); | |
73 | ent->len = len; | |
f9039f30 JH |
74 | memcpy(ent->name, name, len); |
75 | ent->name[len] = 0; | |
7dbc2c04 JH |
76 | cmdname[cmdname_cnt++] = ent; |
77 | } | |
78 | ||
79 | static int cmdname_compare(const void *a_, const void *b_) | |
80 | { | |
81 | struct cmdname *a = *(struct cmdname **)a_; | |
82 | struct cmdname *b = *(struct cmdname **)b_; | |
83 | return strcmp(a->name, b->name); | |
84 | } | |
85 | ||
86 | static void pretty_print_string_list(struct cmdname **cmdname, int longest) | |
8e49d503 | 87 | { |
112d0baf | 88 | int cols = 1, rows; |
8e49d503 AE |
89 | int space = longest + 1; /* min 1 SP between words */ |
90 | int max_cols = term_columns() - 1; /* don't print *on* the edge */ | |
112d0baf | 91 | int i, j; |
8e49d503 AE |
92 | |
93 | if (space < max_cols) | |
94 | cols = max_cols / space; | |
112d0baf | 95 | rows = (cmdname_cnt + cols - 1) / cols; |
8e49d503 | 96 | |
7dbc2c04 JH |
97 | qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare); |
98 | ||
112d0baf | 99 | for (i = 0; i < rows; i++) { |
8e49d503 AE |
100 | printf(" "); |
101 | ||
112d0baf LT |
102 | for (j = 0; j < cols; j++) { |
103 | int n = j * rows + i; | |
104 | int size = space; | |
105 | if (n >= cmdname_cnt) | |
106 | break; | |
107 | if (j == cols-1 || n + rows >= cmdname_cnt) | |
108 | size = 1; | |
109 | printf("%-*s", size, cmdname[n]->name); | |
8e49d503 AE |
110 | } |
111 | putchar('\n'); | |
112 | } | |
113 | } | |
114 | ||
115 | static void list_commands(const char *exec_path, const char *pattern) | |
116 | { | |
7dbc2c04 JH |
117 | unsigned int longest = 0; |
118 | char path[PATH_MAX]; | |
119 | int dirlen; | |
120 | DIR *dir = opendir(exec_path); | |
121 | struct dirent *de; | |
122 | ||
123 | if (!dir) { | |
124 | fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno)); | |
8e49d503 AE |
125 | exit(1); |
126 | } | |
127 | ||
7dbc2c04 JH |
128 | dirlen = strlen(exec_path); |
129 | if (PATH_MAX - 20 < dirlen) { | |
130 | fprintf(stderr, "git: insanely long exec-path '%s'\n", | |
131 | exec_path); | |
8e49d503 AE |
132 | exit(1); |
133 | } | |
134 | ||
7dbc2c04 JH |
135 | memcpy(path, exec_path, dirlen); |
136 | path[dirlen++] = '/'; | |
137 | ||
138 | while ((de = readdir(dir)) != NULL) { | |
139 | struct stat st; | |
140 | int entlen; | |
8e49d503 | 141 | |
7dbc2c04 JH |
142 | if (strncmp(de->d_name, "git-", 4)) |
143 | continue; | |
144 | strcpy(path+dirlen, de->d_name); | |
145 | if (stat(path, &st) || /* stat, not lstat */ | |
146 | !S_ISREG(st.st_mode) || | |
147 | !(st.st_mode & S_IXUSR)) | |
8e49d503 AE |
148 | continue; |
149 | ||
7dbc2c04 | 150 | entlen = strlen(de->d_name); |
f9039f30 JH |
151 | if (4 < entlen && !strcmp(de->d_name + entlen - 4, ".exe")) |
152 | entlen -= 4; | |
8e49d503 | 153 | |
7dbc2c04 JH |
154 | if (longest < entlen) |
155 | longest = entlen; | |
156 | ||
157 | add_cmdname(de->d_name + 4, entlen-4); | |
8e49d503 | 158 | } |
7dbc2c04 | 159 | closedir(dir); |
8e49d503 AE |
160 | |
161 | printf("git commands available in '%s'\n", exec_path); | |
162 | printf("----------------------------"); | |
163 | mput_char('-', strlen(exec_path)); | |
164 | putchar('\n'); | |
7dbc2c04 | 165 | pretty_print_string_list(cmdname, longest - 4); |
8e49d503 AE |
166 | putchar('\n'); |
167 | } | |
168 | ||
169 | #ifdef __GNUC__ | |
4050c0df | 170 | static void cmd_usage(const char *exec_path, const char *fmt, ...) |
8e49d503 AE |
171 | __attribute__((__format__(__printf__, 2, 3), __noreturn__)); |
172 | #endif | |
4050c0df | 173 | static void cmd_usage(const char *exec_path, const char *fmt, ...) |
8e49d503 AE |
174 | { |
175 | if (fmt) { | |
176 | va_list ap; | |
177 | ||
178 | va_start(ap, fmt); | |
179 | printf("git: "); | |
180 | vprintf(fmt, ap); | |
181 | va_end(ap); | |
182 | putchar('\n'); | |
183 | } | |
184 | else | |
185 | puts(git_usage); | |
186 | ||
187 | putchar('\n'); | |
188 | ||
189 | if(exec_path) | |
190 | list_commands(exec_path, "git-*"); | |
191 | ||
192 | exit(1); | |
193 | } | |
194 | ||
195 | static void prepend_to_path(const char *dir, int len) | |
196 | { | |
197 | char *path, *old_path = getenv("PATH"); | |
198 | int path_len = len; | |
199 | ||
200 | if (!old_path) | |
7dbc2c04 | 201 | old_path = "/usr/local/bin:/usr/bin:/bin"; |
8e49d503 AE |
202 | |
203 | path_len = len + strlen(old_path) + 1; | |
204 | ||
205 | path = malloc(path_len + 1); | |
8e49d503 AE |
206 | |
207 | memcpy(path, dir, len); | |
208 | path[len] = ':'; | |
209 | memcpy(path + len + 1, old_path, path_len - len); | |
210 | ||
211 | setenv("PATH", path, 1); | |
212 | } | |
213 | ||
97fc6c5f AE |
214 | static void show_man_page(char *git_cmd) |
215 | { | |
216 | char *page; | |
217 | ||
218 | if (!strncmp(git_cmd, "git", 3)) | |
219 | page = git_cmd; | |
220 | else { | |
221 | int page_len = strlen(git_cmd) + 4; | |
222 | ||
223 | page = malloc(page_len + 1); | |
224 | strcpy(page, "git-"); | |
225 | strcpy(page + 4, git_cmd); | |
226 | page[page_len] = 0; | |
227 | } | |
228 | ||
7dbc2c04 | 229 | execlp("man", "man", page, NULL); |
97fc6c5f AE |
230 | } |
231 | ||
8e49d503 AE |
232 | int main(int argc, char **argv, char **envp) |
233 | { | |
234 | char git_command[PATH_MAX + 1]; | |
235 | char wd[PATH_MAX + 1]; | |
236 | int i, len, show_help = 0; | |
237 | char *exec_path = getenv("GIT_EXEC_PATH"); | |
238 | ||
239 | getcwd(wd, PATH_MAX); | |
240 | ||
241 | if (!exec_path) | |
242 | exec_path = GIT_EXEC_PATH; | |
243 | ||
244 | for (i = 1; i < argc; i++) { | |
245 | char *arg = argv[i]; | |
246 | ||
247 | if (strncmp(arg, "--", 2)) | |
248 | break; | |
249 | ||
250 | arg += 2; | |
251 | ||
252 | if (!strncmp(arg, "exec-path", 9)) { | |
253 | arg += 9; | |
254 | if (*arg == '=') | |
255 | exec_path = arg + 1; | |
256 | else { | |
257 | puts(exec_path); | |
258 | exit(0); | |
259 | } | |
260 | } | |
261 | else if (!strcmp(arg, "version")) { | |
262 | printf("git version %s\n", GIT_VERSION); | |
263 | exit(0); | |
264 | } | |
265 | else if (!strcmp(arg, "help")) | |
266 | show_help = 1; | |
267 | else if (!show_help) | |
4050c0df | 268 | cmd_usage(NULL, NULL); |
8e49d503 AE |
269 | } |
270 | ||
97fc6c5f AE |
271 | if (i >= argc || show_help) { |
272 | if (i >= argc) | |
4050c0df | 273 | cmd_usage(exec_path, NULL); |
97fc6c5f AE |
274 | |
275 | show_man_page(argv[i]); | |
276 | } | |
8e49d503 | 277 | |
7dbc2c04 JH |
278 | if (*exec_path != '/') { |
279 | if (!getcwd(git_command, sizeof(git_command))) { | |
280 | fprintf(stderr, | |
7246ed43 | 281 | "git: cannot determine current directory\n"); |
7dbc2c04 JH |
282 | exit(1); |
283 | } | |
284 | len = strlen(git_command); | |
8e49d503 | 285 | |
7dbc2c04 JH |
286 | /* Trivial cleanup */ |
287 | while (!strncmp(exec_path, "./", 2)) { | |
288 | exec_path += 2; | |
289 | while (*exec_path == '/') | |
874fbc33 | 290 | exec_path++; |
7dbc2c04 JH |
291 | } |
292 | snprintf(git_command + len, sizeof(git_command) - len, | |
293 | "/%s", exec_path); | |
294 | } | |
295 | else | |
296 | strcpy(git_command, exec_path); | |
8e49d503 AE |
297 | len = strlen(git_command); |
298 | prepend_to_path(git_command, len); | |
299 | ||
10b15b86 AR |
300 | len += snprintf(git_command + len, sizeof(git_command) - len, |
301 | "/git-%s", argv[i]); | |
302 | if (sizeof(git_command) <= len) { | |
b270c634 | 303 | fprintf(stderr, "git: command name given is too long.\n"); |
10b15b86 AR |
304 | exit(1); |
305 | } | |
8e49d503 AE |
306 | |
307 | /* execve() can only ever return if it fails */ | |
308 | execve(git_command, &argv[i], envp); | |
10b15b86 AR |
309 | |
310 | if (errno == ENOENT) | |
4050c0df | 311 | cmd_usage(exec_path, "'%s' is not a git-command", argv[i]); |
10b15b86 AR |
312 | |
313 | fprintf(stderr, "Failed to run command '%s': %s\n", | |
314 | git_command, strerror(errno)); | |
8e49d503 AE |
315 | |
316 | return 1; | |
317 | } |