Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "quote.h"
   3#include "exec_cmd.h"
   4#include "strbuf.h"
   5
   6/* Stubs for functions that make no sense for git-shell. These stubs
   7 * are provided here to avoid linking in external redundant modules.
   8 */
   9void release_pack_memory(size_t need, int fd){}
  10void trace_argv_printf(const char **argv, const char *fmt, ...){}
  11void trace_printf(const char *fmt, ...){}
  12
  13
  14static int do_generic_cmd(const char *me, char *arg)
  15{
  16        const char *my_argv[4];
  17
  18        setup_path();
  19        if (!arg || !(arg = sq_dequote(arg)))
  20                die("bad argument");
  21        if (prefixcmp(me, "git-"))
  22                die("bad command");
  23
  24        my_argv[0] = me + 4;
  25        my_argv[1] = arg;
  26        my_argv[2] = NULL;
  27
  28        return execv_git_cmd(my_argv);
  29}
  30
  31static int do_cvs_cmd(const char *me, char *arg)
  32{
  33        const char *cvsserver_argv[3] = {
  34                "cvsserver", "server", NULL
  35        };
  36
  37        if (!arg || strcmp(arg, "server"))
  38                die("git-cvsserver only handles server: %s", arg);
  39
  40        setup_path();
  41        return execv_git_cmd(cvsserver_argv);
  42}
  43
  44
  45static struct commands {
  46        const char *name;
  47        int (*exec)(const char *me, char *arg);
  48} cmd_list[] = {
  49        { "git-receive-pack", do_generic_cmd },
  50        { "git-upload-pack", do_generic_cmd },
  51        { "cvs", do_cvs_cmd },
  52        { NULL },
  53};
  54
  55int main(int argc, char **argv)
  56{
  57        char *prog;
  58        struct commands *cmd;
  59        int devnull_fd;
  60
  61        /*
  62         * Always open file descriptors 0/1/2 to avoid clobbering files
  63         * in die().  It also avoids not messing up when the pipes are
  64         * dup'ed onto stdin/stdout/stderr in the child processes we spawn.
  65         */
  66        devnull_fd = open("/dev/null", O_RDWR);
  67        while (devnull_fd >= 0 && devnull_fd <= 2)
  68                devnull_fd = dup(devnull_fd);
  69        if (devnull_fd == -1)
  70                die("opening /dev/null failed (%s)", strerror(errno));
  71        close (devnull_fd);
  72
  73        /*
  74         * Special hack to pretend to be a CVS server
  75         */
  76        if (argc == 2 && !strcmp(argv[1], "cvs server"))
  77                argv--;
  78
  79        /*
  80         * We do not accept anything but "-c" followed by "cmd arg",
  81         * where "cmd" is a very limited subset of git commands.
  82         */
  83        else if (argc != 3 || strcmp(argv[1], "-c"))
  84                die("What do you think I am? A shell?");
  85
  86        prog = argv[2];
  87        if (!strncmp(prog, "git", 3) && isspace(prog[3]))
  88                /* Accept "git foo" as if the caller said "git-foo". */
  89                prog[3] = '-';
  90
  91        for (cmd = cmd_list ; cmd->name ; cmd++) {
  92                int len = strlen(cmd->name);
  93                char *arg;
  94                if (strncmp(cmd->name, prog, len))
  95                        continue;
  96                arg = NULL;
  97                switch (prog[len]) {
  98                case '\0':
  99                        arg = NULL;
 100                        break;
 101                case ' ':
 102                        arg = prog + len + 1;
 103                        break;
 104                default:
 105                        continue;
 106                }
 107                exit(cmd->exec(cmd->name, arg));
 108        }
 109        die("unrecognized command '%s'", prog);
 110}