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