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/* remap -- a translator for changing paths
Copyright (C) 2013 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include <hurd/trivfs.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <argp.h>
#include <error.h>
#include <string.h>
#include <version.h>
int trivfs_fstype = FSTYPE_MISC;
int trivfs_fsid = 0;
int trivfs_support_read = 0;
int trivfs_support_write = 0;
int trivfs_support_exec = 0;
int trivfs_allow_open = 0;
void
trivfs_modify_stat (struct trivfs_protid *cred, struct stat *st)
{
/* Don't care */
}
error_t
trivfs_goaway (struct trivfs_control *cntl, int flags)
{
exit (0);
}
struct remap
{
char *from;
char *to;
struct remap *next;
};
static struct remap *remaps;
error_t
trivfs_S_dir_lookup (struct trivfs_protid *diruser,
mach_port_t reply, mach_msg_type_name_t reply_type,
char *filename,
int flags,
mode_t mode,
retry_type *do_retry,
char *retry_name,
mach_port_t *retry_port,
mach_msg_type_name_t *retry_port_type)
{
struct remap *remap;
if (!diruser)
return EOPNOTSUPP;
for (remap = remaps; remap; remap = remap->next)
/* FIXME: should match just prefix of filename too */
if (!strcmp (remap->from, filename))
{
#ifdef DEBUG
fprintf (stderr,"replacing %s with %s\n", remap->from, remap->to);
fflush (stderr);
#endif
filename = remap->to;
break;
}
*do_retry = FS_RETRY_REAUTH;
*retry_port = getcrdir ();
*retry_port_type = MACH_MSG_TYPE_COPY_SEND;
strcpy (retry_name, filename);
return 0;
}
static error_t
parse_opt (int key, char *arg, struct argp_state *state)
{
static char *remap_from;
switch (key)
{
case ARGP_KEY_ARG:
if (arg[0] != '/')
{
argp_error (state, "remap only works with absolute paths: %s",
arg);
return EINVAL;
}
/* Skip heading slashes */
while (arg[0] == '/')
arg++;
if (!remap_from)
/* First of a pair */
remap_from = strdup (arg);
else
{
/* Second of a pair */
struct remap *remap = malloc (sizeof (*remap));
remap->from = remap_from;
remap->to = strdup (arg);
remap->next = remaps;
#ifdef DEBUG
fprintf (stderr, "adding remap %s->%s\n", remap->from, remap->to);
#endif
remaps = remap;
remap_from = NULL;
}
break;
}
return 0;
}
const char *argp_program_version = STANDARD_HURD_VERSION (fakeroot);
int
main (int argc, char **argv)
{
error_t err;
mach_port_t bootstrap;
struct argp argp = { NULL, parse_opt, "[ FROM1 TO1 [ FROM2 TO2 [ ... ] ] ]", "\
A translator for remapping directories.\v\
This translator is to be used as a chroot, within which paths point to the\
same files as the original root, except a given set of paths, which are\
remapped to given paths." };
argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, 0);
task_get_bootstrap_port (mach_task_self (), &bootstrap);
struct trivfs_control *fsys;
err = trivfs_startup (bootstrap, 0, 0, 0, 0, 0, &fsys);
if (err)
error (1, err, "trivfs_startup failed");
ports_manage_port_operations_one_thread (fsys->pi.bucket, trivfs_demuxer, 0);
/*NOTREACHED*/
return 0;
}
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