remove unnecessary initializations
[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;
96f1e58f 8static const char *current_exec_path;
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9
10void git_set_exec_path(const char *exec_path)
11{
12 current_exec_path = exec_path;
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
21 if (current_exec_path)
22 return current_exec_path;
23
24 env = getenv("GIT_EXEC_PATH");
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;
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37 const char *paths[] = { current_exec_path,
38 getenv("GIT_EXEC_PATH"),
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 */
59 while (!strncmp(exec_dir, "./", 2)) {
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
575ba9d6 100 if (getenv("GIT_TRACE")) {
575ba9d6 101 const char **p = argv;
e82e058d 102 fputs("trace: exec:", stderr);
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103 while (*p) {
104 fputc(' ', stderr);
105 sq_quote_print(stderr, *p);
106 ++p;
107 }
108 putc('\n', stderr);
109 fflush(stderr);
110 }
111
77cb17e9 112 /* execve() can only ever return if it fails */
9201c707 113 execve(git_command, (char **)argv, environ);
77cb17e9 114
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115 if (getenv("GIT_TRACE")) {
116 fprintf(stderr, "trace: exec failed: %s\n",
117 strerror(errno));
118 fflush(stderr);
119 }
120
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121 argv[0] = tmp;
122 }
123 return -1;
124
125}
126
127
9201c707 128int execl_git_cmd(const char *cmd,...)
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129{
130 int argc;
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131 const char *argv[MAX_ARGS + 1];
132 const char *arg;
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133 va_list param;
134
135 va_start(param, cmd);
136 argv[0] = cmd;
137 argc = 1;
138 while (argc < MAX_ARGS) {
139 arg = argv[argc++] = va_arg(param, char *);
140 if (!arg)
141 break;
142 }
143 va_end(param);
144 if (MAX_ARGS <= argc)
145 return error("too many args to run %s", cmd);
146
147 argv[argc] = NULL;
148 return execv_git_cmd(argv);
149}