builtin-box.c

   1 #include <ctype.h>
   2 #include "cache.h"
   3
   4 int gitbox_main(int argc, char **argv);
   5
   6 static void prepend_to_path(const char *dir, int len)
   7 {
   8         const char *old_path = getenv("PATH");
   9         char *path;
  10         int path_len = len;
  11
  12         if (!old_path)
  13                 old_path = "/usr/local/bin:/usr/bin:/bin";
  14
  15         path_len = len + strlen(old_path) + 1;
  16
  17         path = xmalloc(path_len + 1);
  18
  19         memcpy(path, dir, len);
  20 #ifdef __MINGW32__
  21         path[len] = ';';
  22 #else
  23         path[len] = ':';
  24 #endif
  25         memcpy(path + len + 1, old_path, path_len - len);
  26
  27         setenv("PATH", path, 1);
  28
  29         free(path);
  30 }
  31
  32 int cmd_box(int argc, const char **argv, const char *prefix)
  33 {
  34         const char *cmd = argv[0];
  35         char *slash = strrchr(cmd, '/');
  36         const char *exec_path = NULL;
  37
  38         /*
  39          * Take the basename of argv[0] as the command
  40          * name, and the dirname as the default exec_path
  41          * if it's an absolute path and we don't have
  42          * anything better.
  43          */
  44         if (slash) {
  45                 *slash++ = 0;
  46                 if (*cmd == '/')
  47                         exec_path = cmd;
  48                 cmd = slash;
  49         }
  50
  51 #ifdef __MINGW32__
  52         slash = strrchr(cmd, '\\');
  53         if (slash) {
  54                 *slash++ = 0;
  55                 if (cmd[1] == ':')
  56                         exec_path = cmd;
  57                 cmd = slash;
  58         }
  59 #endif
  60
  61         /*
  62          * We search for git commands in the following order:
  63          *  - git_exec_path()
  64          *  - the path of the "git" command if we could find it
  65          *    in $0
  66          *  - the regular PATH.
  67          */
  68         if (exec_path)
  69                 prepend_to_path(exec_path, strlen(exec_path));
  70         exec_path = git_exec_path();
  71         prepend_to_path(exec_path, strlen(exec_path));
  72
  73         return gitbox_main(argc, argv);
  74 }