list_commands(): simplify code by using chdir()
[git/git.git] / exec_cmd.c
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1#include "cache.h"
2#include "exec_cmd.h"
575ba9d6 3#include "quote.h"
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4#define MAX_ARGS 32
5
6extern char **environ;
7static const char *builtin_exec_path = GIT_EXEC_PATH;
384df833 8static const char *argv_exec_path;
77cb17e9 9
384df833 10void git_set_argv_exec_path(const char *exec_path)
77cb17e9 11{
384df833 12 argv_exec_path = exec_path;
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13}
14
15
16/* Returns the highest-priority, location to look for git programs. */
962554c6 17const char *git_exec_path(void)
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18{
19 const char *env;
20
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21 if (argv_exec_path)
22 return argv_exec_path;
77cb17e9 23
d4ebc36c 24 env = getenv(EXEC_PATH_ENVIRONMENT);
2b601626 25 if (env && *env) {
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26 return env;
27 }
28
29 return builtin_exec_path;
30}
31
32
9201c707 33int execv_git_cmd(const char **argv)
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34{
35 char git_command[PATH_MAX + 1];
d6859901 36 int i;
384df833 37 const char *paths[] = { argv_exec_path,
d4ebc36c 38 getenv(EXEC_PATH_ENVIRONMENT),
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39 builtin_exec_path };
40
b4f2a6ac 41 for (i = 0; i < ARRAY_SIZE(paths); ++i) {
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42 size_t len;
43 int rc;
77cb17e9 44 const char *exec_dir = paths[i];
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45 const char *tmp;
46
2b601626 47 if (!exec_dir || !*exec_dir) continue;
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48
49 if (*exec_dir != '/') {
50 if (!getcwd(git_command, sizeof(git_command))) {
51 fprintf(stderr, "git: cannot determine "
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52 "current directory: %s\n",
53 strerror(errno));
54 break;
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55 }
56 len = strlen(git_command);
57
58 /* Trivial cleanup */
cc44c765 59 while (!prefixcmp(exec_dir, "./")) {
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60 exec_dir += 2;
61 while (*exec_dir == '/')
62 exec_dir++;
63 }
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64
65 rc = snprintf(git_command + len,
66 sizeof(git_command) - len, "/%s",
67 exec_dir);
68 if (rc < 0 || rc >= sizeof(git_command) - len) {
69 fprintf(stderr, "git: command name given "
70 "is too long.\n");
71 break;
72 }
77cb17e9 73 } else {
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74 if (strlen(exec_dir) + 1 > sizeof(git_command)) {
75 fprintf(stderr, "git: command name given "
76 "is too long.\n");
77 break;
78 }
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79 strcpy(git_command, exec_dir);
80 }
81
82 len = strlen(git_command);
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83 rc = snprintf(git_command + len, sizeof(git_command) - len,
84 "/git-%s", argv[0]);
85 if (rc < 0 || rc >= sizeof(git_command) - len) {
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86 fprintf(stderr,
87 "git: command name given is too long.\n");
88 break;
89 }
90
91 /* argv[0] must be the git command, but the argv array
92 * belongs to the caller, and my be reused in
93 * subsequent loop iterations. Save argv[0] and
94 * restore it on error.
95 */
96
97 tmp = argv[0];
98 argv[0] = git_command;
99
7cf67205 100 trace_argv_printf(argv, -1, "trace: exec:");
575ba9d6 101
77cb17e9 102 /* execve() can only ever return if it fails */
9201c707 103 execve(git_command, (char **)argv, environ);
77cb17e9 104
7cf67205 105 trace_printf("trace: exec failed: %s\n", strerror(errno));
575ba9d6 106
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107 argv[0] = tmp;
108 }
109 return -1;
110
111}
112
113
9201c707 114int execl_git_cmd(const char *cmd,...)
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115{
116 int argc;
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117 const char *argv[MAX_ARGS + 1];
118 const char *arg;
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119 va_list param;
120
121 va_start(param, cmd);
122 argv[0] = cmd;
123 argc = 1;
124 while (argc < MAX_ARGS) {
125 arg = argv[argc++] = va_arg(param, char *);
126 if (!arg)
127 break;
128 }
129 va_end(param);
130 if (MAX_ARGS <= argc)
131 return error("too many args to run %s", cmd);
132
133 argv[argc] = NULL;
134 return execv_git_cmd(argv);
135}