271 lines
7.3 KiB
C
271 lines
7.3 KiB
C
/*-
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* Copyright (c) 2009-2015 Juan Romero Pardines.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <dirent.h>
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#include <libgen.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "xbps_api_impl.h"
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static bool
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check_remove_pkg_files(struct xbps_handle *xhp,
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xbps_array_t obsoletes, const char *pkgver, uid_t euid)
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{
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struct stat st;
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bool fail = false;
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if (euid == 0)
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return false;
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for (unsigned int i = 0; i < xbps_array_count(obsoletes); i++) {
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const char *file = NULL;
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xbps_array_get_cstring_nocopy(obsoletes, i, &file);
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/*
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* Check if effective user ID owns the file; this is
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* enough to ensure the user has write permissions
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* on the directory.
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*/
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if (lstat(file, &st) == 0 && euid == st.st_uid) {
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/* success */
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continue;
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}
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if (errno != ENOENT) {
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/*
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* only bail out if something else than ENOENT
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* is returned.
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*/
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int rv = errno;
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if (rv == 0) {
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/* lstat succeeds but euid != uid */
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rv = EPERM;
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}
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fail = true;
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FILE_FAIL,
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rv, pkgver,
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"%s: cannot remove `%s': %s",
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pkgver, file, strerror(rv));
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}
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errno = 0;
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}
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return fail;
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}
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static int
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remove_pkg_files(struct xbps_handle *xhp,
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xbps_array_t obsoletes,
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const char *pkgver)
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{
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int rv = 0;
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for (unsigned int i = 0; i < xbps_array_count(obsoletes); i++) {
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const char *file = NULL;
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xbps_array_get_cstring_nocopy(obsoletes, i, &file);
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/*
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* Remove the object if possible.
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*/
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if (remove(file) == -1) {
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FILE_FAIL,
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errno, pkgver,
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"%s: failed to remove `%s': %s", pkgver,
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file, strerror(errno));
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} else {
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/* success */
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FILE,
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0, pkgver, "Removed `%s'", file);
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}
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}
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return rv;
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}
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int HIDDEN
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xbps_remove_pkg(struct xbps_handle *xhp, const char *pkgver, bool update)
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{
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xbps_dictionary_t pkgd = NULL, obsd = NULL;
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xbps_array_t obsoletes = NULL;
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char *pkgname, metafile[PATH_MAX];
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int rv = 0;
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pkg_state_t state = 0;
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uid_t euid;
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assert(xhp);
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assert(pkgver);
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pkgname = xbps_pkg_name(pkgver);
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assert(pkgname);
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euid = geteuid();
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if ((pkgd = xbps_pkgdb_get_pkg(xhp, pkgname)) == NULL) {
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rv = errno;
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xbps_dbg_printf(xhp, "[remove] cannot find %s in pkgdb: %s\n",
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pkgver, strerror(rv));
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goto out;
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}
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if ((rv = xbps_pkg_state_dictionary(pkgd, &state)) != 0) {
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xbps_dbg_printf(xhp, "[remove] cannot find %s in pkgdb: %s\n",
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pkgver, strerror(rv));
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goto out;
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}
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xbps_dbg_printf(xhp, "attempting to remove %s state %d\n", pkgver, state);
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if (!update)
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE, 0, pkgver, NULL);
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if (chdir(xhp->rootdir) == -1) {
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rv = errno;
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL,
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rv, pkgver,
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"%s: [remove] failed to chdir to rootdir `%s': %s",
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pkgver, xhp->rootdir, strerror(rv));
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goto out;
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}
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/* If package was "half-removed", remove it fully. */
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if (state == XBPS_PKG_STATE_HALF_REMOVED)
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goto purge;
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/*
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* Run the pre remove action and show pre-remove message if exists.
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*/
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rv = xbps_pkg_exec_script(xhp, pkgd, "remove-script", "pre", update);
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if (rv != 0) {
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL,
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errno, pkgver,
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"%s: [remove] REMOVE script failed to "
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"execute pre ACTION: %s",
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pkgver, strerror(rv));
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goto out;
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}
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/* show remove-msg if exists */
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if ((rv = xbps_cb_message(xhp, pkgd, "remove-msg")) != 0)
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goto out;
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/* unregister alternatives */
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if (update)
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xbps_dictionary_set_bool(pkgd, "alternatives-update", true);
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if ((rv = xbps_alternatives_unregister(xhp, pkgd)) != 0)
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goto out;
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/*
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* If updating a package, we just need to execute the current
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* pre-remove action target and we are done. Its files will be
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* overwritten later in unpack phase.
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*/
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if (update) {
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free(pkgname);
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return 0;
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}
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if (xbps_dictionary_get_dict(xhp->transd, "obsolete_files", &obsd))
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obsoletes = xbps_dictionary_get(obsd, pkgname);
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if (xbps_array_count(obsoletes) > 0) {
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/*
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* Do the removal in 2 phases:
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* 1- check if user has enough perms to remove all entries
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* 2- perform removal
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*/
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if (check_remove_pkg_files(xhp, obsoletes, pkgver, euid)) {
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rv = EPERM;
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goto out;
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}
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/* Remove links */
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if ((rv = remove_pkg_files(xhp, obsoletes, pkgver)) != 0)
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goto out;
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}
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/*
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* Execute the post REMOVE action if file exists and we aren't
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* updating the package.
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*/
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rv = xbps_pkg_exec_script(xhp, pkgd, "remove-script", "post", false);
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if (rv != 0) {
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL,
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rv, pkgver,
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"%s: [remove] REMOVE script failed to execute "
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"post ACTION: %s", pkgver, strerror(rv));
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goto out;
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}
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/*
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* Set package state to "half-removed".
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*/
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rv = xbps_set_pkg_state_dictionary(pkgd,
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XBPS_PKG_STATE_HALF_REMOVED);
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if (rv != 0) {
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL,
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rv, pkgver,
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"%s: [remove] failed to set state to half-removed: %s",
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pkgver, strerror(rv));
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goto out;
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}
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purge:
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/*
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* Execute the purge REMOVE action if file exists.
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*/
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rv = xbps_pkg_exec_script(xhp, pkgd, "remove-script", "purge", false);
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if (rv != 0) {
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL,
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rv, pkgver,
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"%s: REMOVE script failed to execute "
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"purge ACTION: %s", pkgver, strerror(rv));
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goto out;
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}
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/*
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* Remove package metadata plist.
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*/
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snprintf(metafile, sizeof(metafile), "%s/.%s-files.plist", xhp->metadir, pkgname);
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if (remove(metafile) == -1) {
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if (errno != ENOENT) {
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL,
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rv, pkgver,
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"%s: failed to remove metadata file: %s",
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pkgver, strerror(errno));
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}
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}
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/*
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* Unregister package from pkgdb.
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*/
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xbps_dbg_printf(xhp, "[remove] unregister %s returned %d\n", pkgver, rv);
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_DONE, 0, pkgver, NULL);
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xbps_dictionary_remove(xhp->pkgdb, pkgname);
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out:
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if (pkgname != NULL)
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free(pkgname);
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if (rv != 0) {
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL, rv, pkgver,
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"%s: failed to remove package: %s", pkgver, strerror(rv));
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}
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return rv;
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}
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