packv4: nth_packed_object_sha1() packv4 support
[git/packv4.git] / exec_cmd.c
blob9b74ed2f42ad9a452f5a1d9ab55d5ca1e1de2594
1 #include "cache.h"
2 #include "exec_cmd.h"
3 #include "quote.h"
4 #define MAX_ARGS 32
6 extern char **environ;
7 static const char *builtin_exec_path = GIT_EXEC_PATH;
8 static const char *current_exec_path;
10 void git_set_exec_path(const char *exec_path)
12 current_exec_path = exec_path;
16 /* Returns the highest-priority, location to look for git programs. */
17 const char *git_exec_path(void)
19 const char *env;
21 if (current_exec_path)
22 return current_exec_path;
24 env = getenv(EXEC_PATH_ENVIRONMENT);
25 if (env && *env) {
26 return env;
29 return builtin_exec_path;
33 int execv_git_cmd(const char **argv)
35 char git_command[PATH_MAX + 1];
36 int i;
37 const char *paths[] = { current_exec_path,
38 getenv(EXEC_PATH_ENVIRONMENT),
39 builtin_exec_path };
41 for (i = 0; i < ARRAY_SIZE(paths); ++i) {
42 size_t len;
43 int rc;
44 const char *exec_dir = paths[i];
45 const char *tmp;
47 if (!exec_dir || !*exec_dir) continue;
49 if (*exec_dir != '/') {
50 if (!getcwd(git_command, sizeof(git_command))) {
51 fprintf(stderr, "git: cannot determine "
52 "current directory: %s\n",
53 strerror(errno));
54 break;
56 len = strlen(git_command);
58 /* Trivial cleanup */
59 while (!prefixcmp(exec_dir, "./")) {
60 exec_dir += 2;
61 while (*exec_dir == '/')
62 exec_dir++;
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;
73 } else {
74 if (strlen(exec_dir) + 1 > sizeof(git_command)) {
75 fprintf(stderr, "git: command name given "
76 "is too long.\n");
77 break;
79 strcpy(git_command, exec_dir);
82 len = strlen(git_command);
83 rc = snprintf(git_command + len, sizeof(git_command) - len,
84 "/git-%s", argv[0]);
85 if (rc < 0 || rc >= sizeof(git_command) - len) {
86 fprintf(stderr,
87 "git: command name given is too long.\n");
88 break;
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.
97 tmp = argv[0];
98 argv[0] = git_command;
100 trace_argv_printf(argv, -1, "trace: exec:");
102 /* execve() can only ever return if it fails */
103 execve(git_command, (char **)argv, environ);
105 trace_printf("trace: exec failed: %s\n", strerror(errno));
107 argv[0] = tmp;
109 return -1;
114 int execl_git_cmd(const char *cmd,...)
116 int argc;
117 const char *argv[MAX_ARGS + 1];
118 const char *arg;
119 va_list param;
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;
129 va_end(param);
130 if (MAX_ARGS <= argc)
131 return error("too many args to run %s", cmd);
133 argv[argc] = NULL;
134 return execv_git_cmd(argv);