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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> | |
4050c0df | 11 | #include "git-compat-util.h" |
77cb17e9 | 12 | #include "exec_cmd.h" |
8e49d503 | 13 | |
70827b15 | 14 | #include "builtin.h" |
8e49d503 AE |
15 | |
16 | static void prepend_to_path(const char *dir, int len) | |
17 | { | |
18 | char *path, *old_path = getenv("PATH"); | |
19 | int path_len = len; | |
20 | ||
21 | if (!old_path) | |
7dbc2c04 | 22 | old_path = "/usr/local/bin:/usr/bin:/bin"; |
8e49d503 AE |
23 | |
24 | path_len = len + strlen(old_path) + 1; | |
25 | ||
26 | path = malloc(path_len + 1); | |
8e49d503 AE |
27 | |
28 | memcpy(path, dir, len); | |
29 | path[len] = ':'; | |
30 | memcpy(path + len + 1, old_path, path_len - len); | |
31 | ||
32 | setenv("PATH", path, 1); | |
33 | } | |
34 | ||
70827b15 | 35 | const char git_version_string[] = GIT_VERSION; |
5b84f4d8 | 36 | |
9201c707 | 37 | static void handle_internal_command(int argc, const char **argv, char **envp) |
231af832 LT |
38 | { |
39 | const char *cmd = argv[0]; | |
40 | static struct cmd_struct { | |
41 | const char *cmd; | |
9201c707 | 42 | int (*fn)(int, const char **, char **); |
231af832 LT |
43 | } commands[] = { |
44 | { "version", cmd_version }, | |
45 | { "help", cmd_help }, | |
70b006b9 | 46 | { "log", cmd_log }, |
70827b15 | 47 | { "whatchanged", cmd_whatchanged }, |
ba1d4505 | 48 | { "show", cmd_show }, |
755225de | 49 | { "push", cmd_push }, |
c7432087 | 50 | { "count-objects", cmd_count_objects }, |
8ab99476 | 51 | { "diff", cmd_diff }, |
5010cb5f | 52 | { "grep", cmd_grep }, |
231af832 LT |
53 | }; |
54 | int i; | |
55 | ||
1cd95087 LT |
56 | /* Turn "git cmd --help" into "git help cmd" */ |
57 | if (argc > 1 && !strcmp(argv[1], "--help")) { | |
58 | argv[1] = argv[0]; | |
59 | argv[0] = cmd = "help"; | |
60 | } | |
61 | ||
231af832 LT |
62 | for (i = 0; i < ARRAY_SIZE(commands); i++) { |
63 | struct cmd_struct *p = commands+i; | |
64 | if (strcmp(p->cmd, cmd)) | |
65 | continue; | |
66 | exit(p->fn(argc, argv, envp)); | |
67 | } | |
68 | } | |
69 | ||
9201c707 | 70 | int main(int argc, const char **argv, char **envp) |
8e49d503 | 71 | { |
9201c707 | 72 | const char *cmd = argv[0]; |
231af832 | 73 | char *slash = strrchr(cmd, '/'); |
8e49d503 | 74 | char git_command[PATH_MAX + 1]; |
231af832 LT |
75 | const char *exec_path = NULL; |
76 | ||
77 | /* | |
78 | * Take the basename of argv[0] as the command | |
79 | * name, and the dirname as the default exec_path | |
80 | * if it's an absolute path and we don't have | |
81 | * anything better. | |
82 | */ | |
83 | if (slash) { | |
84 | *slash++ = 0; | |
85 | if (*cmd == '/') | |
86 | exec_path = cmd; | |
87 | cmd = slash; | |
88 | } | |
8e49d503 | 89 | |
231af832 LT |
90 | /* |
91 | * "git-xxxx" is the same as "git xxxx", but we obviously: | |
92 | * | |
93 | * - cannot take flags in between the "git" and the "xxxx". | |
94 | * - cannot execute it externally (since it would just do | |
95 | * the same thing over again) | |
96 | * | |
97 | * So we just directly call the internal command handler, and | |
98 | * die if that one cannot handle it. | |
99 | */ | |
100 | if (!strncmp(cmd, "git-", 4)) { | |
101 | cmd += 4; | |
102 | argv[0] = cmd; | |
103 | handle_internal_command(argc, argv, envp); | |
104 | die("cannot handle %s internally", cmd); | |
105 | } | |
8e49d503 | 106 | |
231af832 LT |
107 | /* Default command: "help" */ |
108 | cmd = "help"; | |
8e49d503 | 109 | |
231af832 LT |
110 | /* Look for flags.. */ |
111 | while (argc > 1) { | |
112 | cmd = *++argv; | |
113 | argc--; | |
da6bf70e | 114 | |
231af832 | 115 | if (strncmp(cmd, "--", 2)) |
8e49d503 AE |
116 | break; |
117 | ||
231af832 LT |
118 | cmd += 2; |
119 | ||
120 | /* | |
121 | * For legacy reasons, the "version" and "help" | |
122 | * commands can be written with "--" prepended | |
123 | * to make them look like flags. | |
124 | */ | |
125 | if (!strcmp(cmd, "help")) | |
126 | break; | |
127 | if (!strcmp(cmd, "version")) | |
128 | break; | |
8e49d503 | 129 | |
231af832 LT |
130 | /* |
131 | * Check remaining flags (which by now must be | |
132 | * "--exec-path", but maybe we will accept | |
133 | * other arguments some day) | |
134 | */ | |
135 | if (!strncmp(cmd, "exec-path", 9)) { | |
136 | cmd += 9; | |
137 | if (*cmd == '=') { | |
138 | git_set_exec_path(cmd + 1); | |
139 | continue; | |
8e49d503 | 140 | } |
231af832 | 141 | puts(git_exec_path()); |
8e49d503 AE |
142 | exit(0); |
143 | } | |
a87cd02c | 144 | cmd_usage(0, NULL, NULL); |
97fc6c5f | 145 | } |
231af832 LT |
146 | argv[0] = cmd; |
147 | ||
148 | /* | |
149 | * We search for git commands in the following order: | |
150 | * - git_exec_path() | |
151 | * - the path of the "git" command if we could find it | |
152 | * in $0 | |
153 | * - the regular PATH. | |
154 | */ | |
155 | if (exec_path) | |
156 | prepend_to_path(exec_path, strlen(exec_path)); | |
77cb17e9 MO |
157 | exec_path = git_exec_path(); |
158 | prepend_to_path(exec_path, strlen(exec_path)); | |
8e49d503 | 159 | |
231af832 LT |
160 | /* See if it's an internal command */ |
161 | handle_internal_command(argc, argv, envp); | |
162 | ||
163 | /* .. then try the external ones */ | |
164 | execv_git_cmd(argv); | |
10b15b86 AR |
165 | |
166 | if (errno == ENOENT) | |
a87cd02c | 167 | cmd_usage(0, exec_path, "'%s' is not a git-command", cmd); |
10b15b86 AR |
168 | |
169 | fprintf(stderr, "Failed to run command '%s': %s\n", | |
170 | git_command, strerror(errno)); | |
8e49d503 AE |
171 | |
172 | return 1; | |
173 | } |