shell.c

   1 #include "cache.h"
   2 #include "quote.h"
   3 #include "exec_cmd.h"
   4 #include "strbuf.h"
   5 #include "gettext.h"
   6
   7 static int do_generic_cmd(const char *me, char *arg)
   8 {
   9         const char *my_argv[4];
  10
  11         setup_path();
  12         if (!arg || !(arg = sq_dequote(arg)))
  13                 die("bad argument");
  14         if (prefixcmp(me, "git-"))
  15                 die("bad command");
  16
  17         my_argv[0] = me + 4;
  18         my_argv[1] = arg;
  19         my_argv[2] = NULL;
  20
  21         return execv_git_cmd(my_argv);
  22 }
  23
  24 static int do_cvs_cmd(const char *me, char *arg)
  25 {
  26         const char *cvsserver_argv[3] = {
  27                 "cvsserver", "server", NULL
  28         };
  29
  30         if (!arg || strcmp(arg, "server"))
  31                 die("git-cvsserver only handles server: %s", arg);
  32
  33         setup_path();
  34         return execv_git_cmd(cvsserver_argv);
  35 }
  36
  37
  38 static struct commands {
  39         const char *name;
  40         int (*exec)(const char *me, char *arg);
  41 } cmd_list[] = {
  42         { "git-receive-pack", do_generic_cmd },
  43         { "git-upload-pack", do_generic_cmd },
  44         { "git-upload-archive", do_generic_cmd },
  45         { "cvs", do_cvs_cmd },
  46         { NULL },
  47 };
  48
  49 int main(int argc, char **argv)
  50 {
  51         char *prog;
  52         struct commands *cmd;
  53         int devnull_fd;
  54
  55         git_setup_gettext();
  56
  57         /*
  58          * Always open file descriptors 0/1/2 to avoid clobbering files
  59          * in die().  It also avoids not messing up when the pipes are
  60          * dup'ed onto stdin/stdout/stderr in the child processes we spawn.
  61          */
  62         devnull_fd = open("/dev/null", O_RDWR);
  63         while (devnull_fd >= 0 && devnull_fd <= 2)
  64                 devnull_fd = dup(devnull_fd);
  65         if (devnull_fd == -1)
  66                 die_errno("opening /dev/null failed");
  67         close (devnull_fd);
  68
  69         /*
  70          * Special hack to pretend to be a CVS server
  71          */
  72         if (argc == 2 && !strcmp(argv[1], "cvs server"))
  73                 argv--;
  74
  75         /*
  76          * We do not accept anything but "-c" followed by "cmd arg",
  77          * where "cmd" is a very limited subset of git commands.
  78          */
  79         else if (argc != 3 || strcmp(argv[1], "-c"))
  80                 die("What do you think I am? A shell?");
  81
  82         prog = argv[2];
  83         if (!strncmp(prog, "git", 3) && isspace(prog[3]))
  84                 /* Accept "git foo" as if the caller said "git-foo". */
  85                 prog[3] = '-';
  86
  87         for (cmd = cmd_list ; cmd->name ; cmd++) {
  88                 int len = strlen(cmd->name);
  89                 char *arg;
  90                 if (strncmp(cmd->name, prog, len))
  91                         continue;
  92                 arg = NULL;
  93                 switch (prog[len]) {
  94                 case '\0':
  95                         arg = NULL;
  96                         break;
  97                 case ' ':
  98                         arg = prog + len + 1;
  99                         break;
 100                 default:
 101                         continue;
 102                 }
 103                 exit(cmd->exec(cmd->name, arg));
 104         }
 105         die("unrecognized command '%s'", prog);
 106 }