builtin-shell.c

   1 #include "cache.h"
   2 #include "quote.h"
   3 #include "exec_cmd.h"
   4 #include "strbuf.h"
   5 #include "builtin.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         { "cvs", do_cvs_cmd },
  45         { NULL },
  46 };
  47
  48 int cmd_shell(int argc, const char **argv, const char *prefix)
  49 {
  50         char *prog;
  51         struct commands *cmd;
  52
  53         /*
  54          * Special hack to pretend to be a CVS server
  55          */
  56         if (argc == 2 && !strcmp(argv[1], "cvs server"))
  57                 argv--;
  58
  59         /*
  60          * We do not accept anything but "-c" followed by "cmd arg",
  61          * where "cmd" is a very limited subset of git commands.
  62          */
  63         else if (argc != 3 || strcmp(argv[1], "-c"))
  64                 die("What do you think I am? A shell?");
  65
  66         prog = xstrdup(argv[2]);
  67         if (!strncmp(prog, "git", 3) && isspace(prog[3]))
  68                 /* Accept "git foo" as if the caller said "git-foo". */
  69                 prog[3] = '-';
  70
  71         for (cmd = cmd_list ; cmd->name ; cmd++) {
  72                 int len = strlen(cmd->name);
  73                 char *arg;
  74                 if (strncmp(cmd->name, prog, len))
  75                         continue;
  76                 arg = NULL;
  77                 switch (prog[len]) {
  78                 case '\0':
  79                         arg = NULL;
  80                         break;
  81                 case ' ':
  82                         arg = prog + len + 1;
  83                         break;
  84                 default:
  85                         continue;
  86                 }
  87                 exit(cmd->exec(cmd->name, arg));
  88         }
  89         die("unrecognized command '%s'", prog);
  90 }