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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 }, |
231af832 LT |
49 | }; |
50 | int i; | |
51 | ||
1cd95087 LT |
52 | /* Turn "git cmd --help" into "git help cmd" */ |
53 | if (argc > 1 && !strcmp(argv[1], "--help")) { | |
54 | argv[1] = argv[0]; | |
55 | argv[0] = cmd = "help"; | |
56 | } | |
57 | ||
231af832 LT |
58 | for (i = 0; i < ARRAY_SIZE(commands); i++) { |
59 | struct cmd_struct *p = commands+i; | |
60 | if (strcmp(p->cmd, cmd)) | |
61 | continue; | |
62 | exit(p->fn(argc, argv, envp)); | |
63 | } | |
64 | } | |
65 | ||
9201c707 | 66 | int main(int argc, const char **argv, char **envp) |
8e49d503 | 67 | { |
9201c707 | 68 | const char *cmd = argv[0]; |
231af832 | 69 | char *slash = strrchr(cmd, '/'); |
8e49d503 | 70 | char git_command[PATH_MAX + 1]; |
231af832 LT |
71 | const char *exec_path = NULL; |
72 | ||
73 | /* | |
74 | * Take the basename of argv[0] as the command | |
75 | * name, and the dirname as the default exec_path | |
76 | * if it's an absolute path and we don't have | |
77 | * anything better. | |
78 | */ | |
79 | if (slash) { | |
80 | *slash++ = 0; | |
81 | if (*cmd == '/') | |
82 | exec_path = cmd; | |
83 | cmd = slash; | |
84 | } | |
8e49d503 | 85 | |
231af832 LT |
86 | /* |
87 | * "git-xxxx" is the same as "git xxxx", but we obviously: | |
88 | * | |
89 | * - cannot take flags in between the "git" and the "xxxx". | |
90 | * - cannot execute it externally (since it would just do | |
91 | * the same thing over again) | |
92 | * | |
93 | * So we just directly call the internal command handler, and | |
94 | * die if that one cannot handle it. | |
95 | */ | |
96 | if (!strncmp(cmd, "git-", 4)) { | |
97 | cmd += 4; | |
98 | argv[0] = cmd; | |
99 | handle_internal_command(argc, argv, envp); | |
100 | die("cannot handle %s internally", cmd); | |
101 | } | |
8e49d503 | 102 | |
231af832 LT |
103 | /* Default command: "help" */ |
104 | cmd = "help"; | |
8e49d503 | 105 | |
231af832 LT |
106 | /* Look for flags.. */ |
107 | while (argc > 1) { | |
108 | cmd = *++argv; | |
109 | argc--; | |
da6bf70e | 110 | |
231af832 | 111 | if (strncmp(cmd, "--", 2)) |
8e49d503 AE |
112 | break; |
113 | ||
231af832 LT |
114 | cmd += 2; |
115 | ||
116 | /* | |
117 | * For legacy reasons, the "version" and "help" | |
118 | * commands can be written with "--" prepended | |
119 | * to make them look like flags. | |
120 | */ | |
121 | if (!strcmp(cmd, "help")) | |
122 | break; | |
123 | if (!strcmp(cmd, "version")) | |
124 | break; | |
8e49d503 | 125 | |
231af832 LT |
126 | /* |
127 | * Check remaining flags (which by now must be | |
128 | * "--exec-path", but maybe we will accept | |
129 | * other arguments some day) | |
130 | */ | |
131 | if (!strncmp(cmd, "exec-path", 9)) { | |
132 | cmd += 9; | |
133 | if (*cmd == '=') { | |
134 | git_set_exec_path(cmd + 1); | |
135 | continue; | |
8e49d503 | 136 | } |
231af832 | 137 | puts(git_exec_path()); |
8e49d503 AE |
138 | exit(0); |
139 | } | |
a87cd02c | 140 | cmd_usage(0, NULL, NULL); |
97fc6c5f | 141 | } |
231af832 LT |
142 | argv[0] = cmd; |
143 | ||
144 | /* | |
145 | * We search for git commands in the following order: | |
146 | * - git_exec_path() | |
147 | * - the path of the "git" command if we could find it | |
148 | * in $0 | |
149 | * - the regular PATH. | |
150 | */ | |
151 | if (exec_path) | |
152 | prepend_to_path(exec_path, strlen(exec_path)); | |
77cb17e9 MO |
153 | exec_path = git_exec_path(); |
154 | prepend_to_path(exec_path, strlen(exec_path)); | |
8e49d503 | 155 | |
231af832 LT |
156 | /* See if it's an internal command */ |
157 | handle_internal_command(argc, argv, envp); | |
158 | ||
159 | /* .. then try the external ones */ | |
160 | execv_git_cmd(argv); | |
10b15b86 AR |
161 | |
162 | if (errno == ENOENT) | |
a87cd02c | 163 | cmd_usage(0, exec_path, "'%s' is not a git-command", cmd); |
10b15b86 AR |
164 | |
165 | fprintf(stderr, "Failed to run command '%s': %s\n", | |
166 | git_command, strerror(errno)); | |
8e49d503 AE |
167 | |
168 | return 1; | |
169 | } |