exec_cmd.c

   1 #include "cache.h"
   2 #include "exec_cmd.h"
   3 #include "quote.h"
   4 #define MAX_ARGS        32
   5
   6 extern char **environ;
   7 static const char *argv_exec_path;
   8 static const char *argv0_path;
   9
  10 const char *system_path(const char *path)
  11 {
  12         static const char *prefix = PREFIX;
  13         struct strbuf d = STRBUF_INIT;
  14
  15         if (is_absolute_path(path))
  16                 return path;
  17
  18         strbuf_addf(&d, "%s/%s", prefix, path);
  19         path = strbuf_detach(&d, NULL);
  20         return path;
  21 }
  22
  23 void git_set_argv0_path(const char *path)
  24 {
  25         argv0_path = path;
  26 }
  27
  28 void git_set_argv_exec_path(const char *exec_path)
  29 {
  30         argv_exec_path = exec_path;
  31 }
  32
  33
  34 /* Returns the highest-priority, location to look for git programs. */
  35 const char *git_exec_path(void)
  36 {
  37         const char *env;
  38
  39         if (argv_exec_path)
  40                 return argv_exec_path;
  41
  42         env = getenv(EXEC_PATH_ENVIRONMENT);
  43         if (env && *env) {
  44                 return env;
  45         }
  46
  47         return system_path(GIT_EXEC_PATH);
  48 }
  49
  50 static void add_path(struct strbuf *out, const char *path)
  51 {
  52         if (path && *path) {
  53                 if (is_absolute_path(path))
  54                         strbuf_addstr(out, path);
  55                 else
  56                         strbuf_addstr(out, make_nonrelative_path(path));
  57
  58                 strbuf_addch(out, PATH_SEP);
  59         }
  60 }
  61
  62 void setup_path(void)
  63 {
  64         const char *old_path = getenv("PATH");
  65         struct strbuf new_path = STRBUF_INIT;
  66
  67         add_path(&new_path, argv_exec_path);
  68         add_path(&new_path, getenv(EXEC_PATH_ENVIRONMENT));
  69         add_path(&new_path, system_path(GIT_EXEC_PATH));
  70         add_path(&new_path, argv0_path);
  71
  72         if (old_path)
  73                 strbuf_addstr(&new_path, old_path);
  74         else
  75                 strbuf_addstr(&new_path, "/usr/local/bin:/usr/bin:/bin");
  76
  77         setenv("PATH", new_path.buf, 1);
  78
  79         strbuf_release(&new_path);
  80 }
  81
  82 const char **prepare_git_cmd(const char **argv)
  83 {
  84         int argc;
  85         const char **nargv;
  86
  87         for (argc = 0; argv[argc]; argc++)
  88                 ; /* just counting */
  89         nargv = xmalloc(sizeof(*nargv) * (argc + 2));
  90
  91         nargv[0] = "git";
  92         for (argc = 0; argv[argc]; argc++)
  93                 nargv[argc + 1] = argv[argc];
  94         nargv[argc + 1] = NULL;
  95         return nargv;
  96 }
  97
  98 int execv_git_cmd(const char **argv) {
  99         const char **nargv = prepare_git_cmd(argv);
 100         trace_argv_printf(nargv, "trace: exec:");
 101
 102         /* execvp() can only ever return if it fails */
 103         execvp("git", (char **)nargv);
 104
 105         trace_printf("trace: exec failed: %s\n", strerror(errno));
 106
 107         free(nargv);
 108         return -1;
 109 }
 110
 111
 112 int execl_git_cmd(const char *cmd,...)
 113 {
 114         int argc;
 115         const char *argv[MAX_ARGS + 1];
 116         const char *arg;
 117         va_list param;
 118
 119         va_start(param, cmd);
 120         argv[0] = cmd;
 121         argc = 1;
 122         while (argc < MAX_ARGS) {
 123                 arg = argv[argc++] = va_arg(param, char *);
 124                 if (!arg)
 125                         break;
 126         }
 127         va_end(param);
 128         if (MAX_ARGS <= argc)
 129                 return error("too many args to run %s", cmd);
 130
 131         argv[argc] = NULL;
 132         return execv_git_cmd(argv);
 133 }