int fskit_fuse_chown(const char *path, uid_t new_uid, gid_t new_gid) {
struct fskit_fuse_state* state = fskit_fuse_get_state();
if( (state->callbacks & FSKIT_FUSE_CHOWN) == 0 ) {
return -ENOSYS;
}
fskit_debug("chown(%s, %d, %d)\n", path, new_uid, new_gid );
uid_t uid = fskit_fuse_get_uid( state );
gid_t gid = fskit_fuse_get_gid( state );
int rc = fskit_chown( state->core, path, uid, gid, new_uid, new_gid );
fskit_debug("chown(%s, %d, %d) rc = %d\n", path, new_uid, new_gid, rc );
return rc;
}
// initialize the filesystem front-end
// call after vdev_init
// return 0 on success
// return -ENOMEM on OOM
// return negative on error
int vdevfs_init( struct vdevfs* vdev, int argc, char** argv ) {
int rc = 0;
int rh = 0;
struct fskit_core* core = NULL;
int fuse_argc = 0;
char** fuse_argv = NULL;
int dirfd = 0;
// library setup
vdev_setup_global();
struct fskit_fuse_state* fs = VDEV_CALLOC( struct fskit_fuse_state, 1 );
if( fs == NULL ) {
return -ENOMEM;
}
fuse_argv = VDEV_CALLOC( char*, argc + 5 );
if( fuse_argv == NULL ) {
free( fs );
return -ENOMEM;
}
// load config
vdev->config = VDEV_CALLOC( struct vdev_config, 1 );
if( vdev->config == NULL ) {
free( fs );
free( fuse_argv );
return -ENOMEM;
}
// init config
rc = vdev_config_init( vdev->config );
if( rc != 0 ) {
vdev_error("vdev_config_init rc = %d\n", rc );
vdevfs_shutdown( vdev );
free( fs );
free( fuse_argv );
return rc;
}
// parse opts
rc = vdev_config_load_from_args( vdev->config, argc, argv, &fuse_argc, fuse_argv );
if( rc != 0 ) {
vdev_error("vdev_opts_parse rc = %d\n", rc );
vdev_config_usage( argv[0] );
free( fs );
free( fuse_argv );
vdevfs_shutdown( vdev );
return rc;
}
// get the mountpoint, but from FUSE
if( vdev->config->mountpoint != NULL ) {
free( vdev->config->mountpoint );
}
rc = vdev_get_mountpoint( fuse_argc, fuse_argv, &vdev->config->mountpoint );
if( rc != 0 ) {
vdev_error("vdev_get_mountpoint rc = %d\n", rc );
vdev_config_usage( argv[0] );
free( fs );
free( fuse_argv );
return rc;
}
vdev_set_debug_level( vdev->config->debug_level );
vdev_set_error_level( vdev->config->error_level );
vdev_debug("Config file: %s\n", vdev->config->config_path );
rc = vdev_config_load( vdev->config->config_path, vdev->config );
if( rc != 0 ) {
vdev_error("vdev_config_load('%s') rc = %d\n", vdev->config->config_path, rc );
vdevfs_shutdown( vdev );
free( fs );
free( fuse_argv );
return rc;
}
vdev_debug("vdev ACLs dir: %s\n", vdev->config->acls_dir );
// force -odev, since we'll create device nodes
fuse_argv[fuse_argc] = (char*)vdev_fuse_odev;
fuse_argc++;
// force -oallow_other, since we'll want to expose this to everyone
fuse_argv[fuse_argc] = (char*)vdev_fuse_allow_other;
fuse_argc++;
// force -ononempty, since we'll want to import the underlying filesystem
fuse_argv[fuse_argc] = (char*)vdev_fuse_ononempty;
fuse_argc++;
vdev->mountpoint = vdev_strdup_or_null( vdev->config->mountpoint );
if( vdev->mountpoint == NULL ) {
vdev_error("Failed to set mountpoint, config.mountpount = '%s'\n", vdev->config->mountpoint );
vdevfs_shutdown( vdev );
free( fuse_argv );
free( fs );
return -EINVAL;
}
else {
vdev_debug("mountpoint: %s\n", vdev->mountpoint );
}
vdev->argc = argc;
vdev->argv = argv;
vdev->fuse_argc = fuse_argc;
vdev->fuse_argv = fuse_argv;
fskit_set_debug_level( vdev->config->debug_level );
fskit_set_error_level( vdev->config->error_level );
// get mountpoint directory
dirfd = open( vdev->mountpoint, O_DIRECTORY );
if( dirfd < 0 ) {
rc = -errno;
vdev_error("open('%s') rc = %d\n", vdev->mountpoint, rc );
free( fs );
vdevfs_shutdown( vdev );
return rc;
}
vdev->mountpoint_dirfd = dirfd;
// set up fskit
rc = fskit_fuse_init( fs, vdev );
if( rc != 0 ) {
vdev_error("fskit_fuse_init rc = %d\n", rc );
free( fs );
vdevfs_shutdown( vdev );
return rc;
}
// load ACLs
rc = vdev_acl_load_all( vdev->config->acls_dir, &vdev->acls, &vdev->num_acls );
if( rc != 0 ) {
vdev_error("vdev_acl_load_all('%s') rc = %d\n", vdev->config->acls_dir, rc );
fskit_fuse_shutdown( fs, NULL );
free( fs );
vdevfs_shutdown( vdev );
return rc;
}
// make sure the fs can access its methods through the VFS
fskit_fuse_setting_enable( fs, FSKIT_FUSE_SET_FS_ACCESS );
core = fskit_fuse_get_core( fs );
// add handlers.
rh = fskit_route_readdir( core, FSKIT_ROUTE_ANY, vdevfs_readdir, FSKIT_CONCURRENT );
if( rh < 0 ) {
vdev_error("fskit_route_readdir(%s) rc = %d\n", FSKIT_ROUTE_ANY, rh );
goto vdev_route_fail;
}
rh = fskit_route_stat( core, FSKIT_ROUTE_ANY, vdevfs_stat, FSKIT_CONCURRENT );
if( rh < 0 ) {
vdev_error("fskit_route_stat(%s) rc = %d\n", FSKIT_ROUTE_ANY, rh );
goto vdev_route_fail;
}
rh = fskit_route_mknod( core, FSKIT_ROUTE_ANY, vdevfs_mknod, FSKIT_CONCURRENT );
if( rc < 0 ) {
vdev_error("fskit_route_mknod(%s) rc = %d\n", FSKIT_ROUTE_ANY, rh );
goto vdev_route_fail;
}
rh = fskit_route_mkdir( core, FSKIT_ROUTE_ANY, vdevfs_mkdir, FSKIT_CONCURRENT );
if( rh < 0 ) {
vdev_error("fskit_route_mkdir(%s) rc = %d\n", FSKIT_ROUTE_ANY, rh );
goto vdev_route_fail;
}
rh = fskit_route_create( core, FSKIT_ROUTE_ANY, vdevfs_create, FSKIT_CONCURRENT );
if( rh < 0 ) {
vdev_error("fskit_route_create(%s) rc = %d\n", FSKIT_ROUTE_ANY, rh );
goto vdev_route_fail;
}
rh = fskit_route_open( core, FSKIT_ROUTE_ANY, vdevfs_open, FSKIT_CONCURRENT );
if( rh < 0 ) {
vdev_error("fskit_route_open(%s) rc = %d\n", FSKIT_ROUTE_ANY, rh );
goto vdev_route_fail;
}
rh = fskit_route_read( core, FSKIT_ROUTE_ANY, vdevfs_read, FSKIT_CONCURRENT );
if( rh < 0 ) {
vdev_error("fskit_route_read(%s) rc = %d\n", FSKIT_ROUTE_ANY, rh );
goto vdev_route_fail;
}
rh = fskit_route_write( core, FSKIT_ROUTE_ANY, vdevfs_write, FSKIT_CONCURRENT );
if( rh < 0 ) {
vdev_error("fskit_route_write(%s) rc = %d\n", FSKIT_ROUTE_ANY, rh );
goto vdev_route_fail;
}
rh = fskit_route_close( core, FSKIT_ROUTE_ANY, vdevfs_close, FSKIT_CONCURRENT );
if( rh < 0 ) {
vdev_error("fskit_route_close(%s) rc = %d\n", FSKIT_ROUTE_ANY, rh );
goto vdev_route_fail;
}
rh = fskit_route_sync( core, FSKIT_ROUTE_ANY, vdevfs_sync, FSKIT_CONCURRENT );
if( rh < 0 ) {
vdev_error("fskit_route_sync(%s) rc = %d\n", FSKIT_ROUTE_ANY, rh );
goto vdev_route_fail;
}
rh = fskit_route_detach( core, FSKIT_ROUTE_ANY, vdevfs_detach, FSKIT_CONCURRENT );
if( rh < 0 ) {
vdev_error("fskit_route_detach(%s) rc = %d\n", FSKIT_ROUTE_ANY, rh );
goto vdev_route_fail;
}
vdev->fs = fs;
vdev->close_rh = rh;
// set the root to be owned by the effective UID and GID of user
fskit_chown( core, "/", 0, 0, geteuid(), getegid() );
// import the underlying filesystem once we're mounted, but before taking requests.
rc = fskit_fuse_postmount_callback( fs, vdevfs_dev_import, vdev );
if( rc != 0 ) {
vdev_error("fskit_fuse_postmount_callback() rc = %d\n", rc );
vdev->fs = NULL;
goto vdev_route_fail;
}
return 0;
vdev_route_fail:
fskit_fuse_shutdown( fs, NULL );
free( fs );
vdevfs_shutdown( vdev );
return rh;
}