/*-

* Copyright (c) 2009-2015 Juan Romero Pardines.

* All rights reserved.

*

* Redistribution and use in source and binary forms, with or without

* modification, are permitted provided that the following conditions

* are met:

* 1. Redistributions of source code must retain the above copyright

* notice, this list of conditions and the following disclaimer.

* 2. Redistributions in binary form must reproduce the above copyright

* notice, this list of conditions and the following disclaimer in the

* documentation and/or other materials provided with the distribution.

*

* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

#include <sys/stat.h>

#include <dirent.h>

#include <errno.h>

#include <fcntl.h>

#include <libgen.h>

#include <limits.h>

#include <stdbool.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include "xbps_api_impl.h"

static bool

check_remove_pkg_files(struct xbps_handle *xhp,

xbps_array_t obsoletes, const char *pkgver, uid_t euid)

{

struct stat st;

bool fail = false;

if (euid == 0)

return false;

for (unsigned int i = 0; i < xbps_array_count(obsoletes); i++) {

const char *file = NULL;

xbps_array_get_cstring_nocopy(obsoletes, i, &file);

/*

* Check if effective user ID owns the file; this is

* enough to ensure the user has write permissions

* on the directory.

*/

if (lstat(file, &st) == 0 && euid == st.st_uid) {

/* success */

continue;

}

if (errno != ENOENT) {

/*

* only bail out if something else than ENOENT

* is returned.

*/

int rv = errno;

if (rv == 0) {

/* lstat succeeds but euid != uid */

rv = EPERM;

}

fail = true;

xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FILE_FAIL,

rv, pkgver,

"%s: cannot remove `%s': %s",

pkgver, file, strerror(rv));

}

errno = 0;

}

return fail;

}

static int

remove_pkg_files(struct xbps_handle *xhp,

xbps_array_t obsoletes,

const char *pkgver)

{

int rv = 0;

for (unsigned int i = 0; i < xbps_array_count(obsoletes); i++) {

const char *file = NULL;

xbps_array_get_cstring_nocopy(obsoletes, i, &file);

/*

* Remove the object if possible.

*/

if (remove(file) == -1) {

xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FILE_FAIL,

errno, pkgver,

"%s: failed to remove `%s': %s", pkgver,

file, strerror(errno));

} else {

/* success */

xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FILE,

0, pkgver, "Removed `%s'", file);

}

}

return rv;

}

int HIDDEN

xbps_remove_pkg(struct xbps_handle *xhp, const char *pkgver, bool update)

{

xbps_dictionary_t pkgd = NULL, obsd = NULL;

xbps_array_t obsoletes = NULL;

char pkgname[XBPS_NAME_SIZE], metafile[PATH_MAX];

int rv = 0;

pkg_state_t state = 0;

uid_t euid;

assert(xhp);

assert(pkgver);

if (!xbps_pkg_name(pkgname, sizeof(pkgname), pkgver)) {

abort();

}

euid = geteuid();

if ((pkgd = xbps_pkgdb_get_pkg(xhp, pkgname)) == NULL) {

rv = errno;

xbps_dbg_printf("[remove] cannot find %s in pkgdb: %s\n",

pkgver, strerror(rv));

goto out;

}

if ((rv = xbps_pkg_state_dictionary(pkgd, &state)) != 0) {

xbps_dbg_printf("[remove] cannot find %s in pkgdb: %s\n",

pkgver, strerror(rv));

goto out;

}

xbps_dbg_printf("attempting to remove %s state %d\n", pkgver, state);

if (!update)

xbps_set_cb_state(xhp, XBPS_STATE_REMOVE, 0, pkgver, NULL);

if (chdir(xhp->rootdir) == -1) {

rv = errno;

xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL,

rv, pkgver,

"%s: [remove] failed to chdir to rootdir `%s': %s",

pkgver, xhp->rootdir, strerror(rv));

goto out;

}

/* If package was "half-removed", remove it fully. */

if (state == XBPS_PKG_STATE_HALF_REMOVED)

goto purge;

/* unregister alternatives */

if (update)

xbps_dictionary_set_bool(pkgd, "alternatives-update", true);

if ((rv = xbps_alternatives_unregister(xhp, pkgd)) != 0)

goto out;

/*

* If updating a package, we just need to execute the current

* pre-remove action target and we are done. Its files will be

* overwritten later in unpack phase.

*/

if (update) {

return 0;

}

if (xbps_dictionary_get_dict(xhp->transd, "obsolete_files", &obsd))

obsoletes = xbps_dictionary_get(obsd, pkgname);

if (xbps_array_count(obsoletes) > 0) {

/*

* Do the removal in 2 phases:

* 1- check if user has enough perms to remove all entries

* 2- perform removal

*/

if (check_remove_pkg_files(xhp, obsoletes, pkgver, euid)) {

rv = EPERM;

goto out;

}

/* Remove links */

if ((rv = remove_pkg_files(xhp, obsoletes, pkgver)) != 0)

goto out;

}

/*

* Set package state to "half-removed".

*/

rv = xbps_set_pkg_state_dictionary(pkgd,

XBPS_PKG_STATE_HALF_REMOVED);

if (rv != 0) {

xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL,

rv, pkgver,

"%s: [remove] failed to set state to half-removed: %s",

pkgver, strerror(rv));

goto out;

}

/* XXX: setting the state and then removing the package seems useless. */

purge:

/*

* Remove package metadata plist.

*/

snprintf(metafile, sizeof(metafile), "%s/.%s-files.plist", xhp->metadir, pkgname);

if (remove(metafile) == -1) {

if (errno != ENOENT) {

xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL,

rv, pkgver,

"%s: failed to remove metadata file: %s",

pkgver, strerror(errno));

}

}

/*

* Unregister package from pkgdb.

*/

xbps_dbg_printf("[remove] unregister %s returned %d\n", pkgver, rv);

xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_DONE, 0, pkgver, NULL);

xbps_dictionary_remove(xhp->pkgdb, pkgname);

out:

if (rv != 0) {

xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL, rv, pkgver,

"%s: failed to remove package: %s", pkgver, strerror(rv));

}

return rv;

}