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pacman/lib/libalpm/remove.c
Nagy Gabor a888f377a5 HoldPkg rework 
The HoldPkg feature is even more important when the packages to be held are
pulled automatically by pacman, in a -Rc and -Rs operation. Before, it only
applied when the packages were explicitly requested by the user to be
removed. This patch extends holdpkg to -Rc and -Rs by doing the HoldPkg
check just before trans_commit.

Additionally, the whole HoldPkg stuff was moved to the front-end.

I changed the default behavior to "don't remove", so I modified remove030.py
pactest as well.

See also: FS#9173.

Original-work-by: Xavier Chantry <shiningxc@gmail.com>
Signed-off-by: Nagy Gabor <ngaba@bibl.u-szeged.hu>
Signed-off-by: Dan McGee <dan@archlinux.org>
2009-01-12 22:44:00 -06:00

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/*
* remove.c
*
* Copyright (c) 2002-2007 by Judd Vinet <jvinet@zeroflux.org>
* Copyright (c) 2005 by Aurelien Foret <orelien@chez.com>
* Copyright (c) 2005 by Christian Hamar <krics@linuxforum.hu>
* Copyright (c) 2006 by David Kimpe <dnaku@frugalware.org>
* Copyright (c) 2005, 2006 by Miklos Vajna <vmiklos@frugalware.org>
*
* 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 of the License, 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdlib.h>
#include <errno.h>
#include <time.h>
#include <fcntl.h>
#include <string.h>
#include <limits.h>
#include <unistd.h>
#include <sys/stat.h>
/* libalpm */
#include "remove.h"
#include "alpm_list.h"
#include "trans.h"
#include "util.h"
#include "log.h"
#include "backup.h"
#include "package.h"
#include "db.h"
#include "cache.h"
#include "deps.h"
#include "handle.h"
#include "alpm.h"
int _alpm_remove_loadtarget(pmtrans_t *trans, pmdb_t *db, char *name)
{
pmpkg_t *info;
ALPM_LOG_FUNC;
ASSERT(db != NULL, RET_ERR(PM_ERR_DB_NULL, -1));
ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
ASSERT(name != NULL, RET_ERR(PM_ERR_WRONG_ARGS, -1));
if(_alpm_pkg_find(trans->packages, name)) {
RET_ERR(PM_ERR_TRANS_DUP_TARGET, -1);
}
if((info = _alpm_db_get_pkgfromcache(db, name)) == NULL) {
_alpm_log(PM_LOG_DEBUG, "could not find %s in database\n", name);
RET_ERR(PM_ERR_PKG_NOT_FOUND, -1);
}
_alpm_log(PM_LOG_DEBUG, "adding %s in the targets list\n", info->name);
trans->packages = alpm_list_add(trans->packages, _alpm_pkg_dup(info));
return(0);
}
static void remove_prepare_cascade(pmtrans_t *trans, pmdb_t *db,
alpm_list_t *lp)
{
ALPM_LOG_FUNC;
while(lp) {
alpm_list_t *i;
for(i = lp; i; i = i->next) {
pmdepmissing_t *miss = (pmdepmissing_t *)i->data;
pmpkg_t *info = _alpm_db_get_pkgfromcache(db, miss->target);
if(info) {
if(!_alpm_pkg_find(trans->packages, alpm_pkg_get_name(info))) {
_alpm_log(PM_LOG_DEBUG, "pulling %s in the targets list\n",
alpm_pkg_get_name(info));
trans->packages = alpm_list_add(trans->packages, _alpm_pkg_dup(info));
}
} else {
_alpm_log(PM_LOG_ERROR, _("could not find %s in database -- skipping\n"),
miss->target);
}
}
alpm_list_free_inner(lp, (alpm_list_fn_free)_alpm_depmiss_free);
alpm_list_free(lp);
lp = alpm_checkdeps(_alpm_db_get_pkgcache(db), 1, trans->packages, NULL);
}
}
static void remove_prepare_keep_needed(pmtrans_t *trans, pmdb_t *db,
alpm_list_t *lp)
{
ALPM_LOG_FUNC;
/* Remove needed packages (which break dependencies) from the target list */
while(lp != NULL) {
alpm_list_t *i;
for(i = lp; i; i = i->next) {
pmdepmissing_t *miss = (pmdepmissing_t *)i->data;
void *vpkg;
pmpkg_t *pkg = _alpm_pkg_find(trans->packages, miss->causingpkg);
if(pkg == NULL) {
continue;
}
trans->packages = alpm_list_remove(trans->packages, pkg, _alpm_pkg_cmp,
&vpkg);
pkg = vpkg;
if(pkg) {
_alpm_log(PM_LOG_WARNING, "removing %s from the target-list\n",
alpm_pkg_get_name(pkg));
_alpm_pkg_free(pkg);
}
}
alpm_list_free_inner(lp, (alpm_list_fn_free)_alpm_depmiss_free);
alpm_list_free(lp);
lp = alpm_checkdeps(_alpm_db_get_pkgcache(db), 1, trans->packages, NULL);
}
}
int _alpm_remove_prepare(pmtrans_t *trans, pmdb_t *db, alpm_list_t **data)
{
alpm_list_t *lp;
ALPM_LOG_FUNC;
ASSERT(db != NULL, RET_ERR(PM_ERR_DB_NULL, -1));
ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
/* skip all checks if we are doing this removal as part of an upgrade */
if(trans->type == PM_TRANS_TYPE_REMOVEUPGRADE) {
return(0);
}
if((trans->flags & PM_TRANS_FLAG_RECURSE) && !(trans->flags & PM_TRANS_FLAG_CASCADE)) {
_alpm_log(PM_LOG_DEBUG, "finding removable dependencies\n");
_alpm_recursedeps(db, trans->packages, trans->flags & PM_TRANS_FLAG_RECURSEALL);
}
if(!(trans->flags & PM_TRANS_FLAG_NODEPS)) {
EVENT(trans, PM_TRANS_EVT_CHECKDEPS_START, NULL, NULL);
_alpm_log(PM_LOG_DEBUG, "looking for unsatisfied dependencies\n");
lp = alpm_checkdeps(_alpm_db_get_pkgcache(db), 1, trans->packages, NULL);
if(lp != NULL) {
if(trans->flags & PM_TRANS_FLAG_CASCADE) {
remove_prepare_cascade(trans, db, lp);
} else if (trans->flags & PM_TRANS_FLAG_UNNEEDED) {
/* Remove needed packages (which would break dependencies)
* from the target list */
remove_prepare_keep_needed(trans, db, lp);
} else {
if(data) {
*data = lp;
} else {
alpm_list_free_inner(lp, (alpm_list_fn_free)_alpm_depmiss_free);
alpm_list_free(lp);
}
RET_ERR(PM_ERR_UNSATISFIED_DEPS, -1);
}
}
}
/* re-order w.r.t. dependencies */
_alpm_log(PM_LOG_DEBUG, "sorting by dependencies\n");
lp = _alpm_sortbydeps(trans->packages, 1);
/* free the old alltargs */
alpm_list_free(trans->packages);
trans->packages = lp;
/* -Rcs == -Rc then -Rs */
if((trans->flags & PM_TRANS_FLAG_CASCADE) && (trans->flags & PM_TRANS_FLAG_RECURSE)) {
_alpm_log(PM_LOG_DEBUG, "finding removable dependencies\n");
_alpm_recursedeps(db, trans->packages, trans->flags & PM_TRANS_FLAG_RECURSEALL);
}
if(!(trans->flags & PM_TRANS_FLAG_NODEPS)) {
EVENT(trans, PM_TRANS_EVT_CHECKDEPS_DONE, NULL, NULL);
}
return(0);
}
static int can_remove_file(pmtrans_t *trans, const char *path)
{
char file[PATH_MAX+1];
snprintf(file, PATH_MAX, "%s%s", handle->root, path);
if(alpm_list_find_str(trans->skip_remove, file)) {
/* return success because we will never actually remove this file */
return(1);
}
/* If we fail write permissions due to a read-only filesystem, abort.
* Assume all other possible failures are covered somewhere else */
if(access(file, W_OK) == -1) {
if(errno != EACCES && errno != ETXTBSY && access(file, F_OK) == 0) {
/* only return failure if the file ACTUALLY exists and we can't write to
* it - ignore "chmod -w" simple permission failures */
_alpm_log(PM_LOG_ERROR, _("cannot remove file '%s': %s\n"),
file, strerror(errno));
return(0);
}
}
return(1);
}
/* Helper function for iterating through a package's file and deleting them
* Used by _alpm_remove_commit. */
static void unlink_file(pmpkg_t *info, alpm_list_t *lp, pmtrans_t *trans)
{
struct stat buf;
int needbackup = 0;
char file[PATH_MAX+1];
ALPM_LOG_FUNC;
char *hash = _alpm_needbackup(lp->data, alpm_pkg_get_backup(info));
if(hash) {
needbackup = 1;
FREE(hash);
}
snprintf(file, PATH_MAX, "%s%s", handle->root, (char *)lp->data);
if(trans->type == PM_TRANS_TYPE_REMOVEUPGRADE) {
/* check noupgrade */
if(alpm_list_find_str(handle->noupgrade, lp->data)) {
_alpm_log(PM_LOG_DEBUG, "Skipping removal of '%s' due to NoUpgrade\n",
file);
return;
}
}
/* we want to do a lstat here, and not a _alpm_lstat.
* if a directory in the package is actually a directory symlink on the
* filesystem, we want to work with the linked directory instead of the
* actual symlink */
if(lstat(file, &buf)) {
_alpm_log(PM_LOG_DEBUG, "file %s does not exist\n", file);
return;
}
if(S_ISDIR(buf.st_mode)) {
if(rmdir(file)) {
/* this is okay, other packages are probably using it (like /usr) */
_alpm_log(PM_LOG_DEBUG, "keeping directory %s\n", file);
} else {
_alpm_log(PM_LOG_DEBUG, "removing directory %s\n", file);
}
} else {
/* check the remove skip list before removing the file.
* see the big comment block in db_find_fileconflicts() for an
* explanation. */
if(alpm_list_find_str(trans->skip_remove, file)) {
_alpm_log(PM_LOG_DEBUG, "%s is in trans->skip_remove, skipping removal\n",
file);
return;
} else if(needbackup) {
/* if the file is flagged, back it up to .pacsave */
if(!(trans->flags & PM_TRANS_FLAG_NOSAVE)) {
char newpath[PATH_MAX];
snprintf(newpath, PATH_MAX, "%s.pacsave", file);
rename(file, newpath);
_alpm_log(PM_LOG_WARNING, _("%s saved as %s\n"), file, newpath);
alpm_logaction("warning: %s saved as %s\n", file, newpath);
return;
} else {
_alpm_log(PM_LOG_DEBUG, "transaction is set to NOSAVE, not backing up '%s'\n", file);
}
}
_alpm_log(PM_LOG_DEBUG, "unlinking %s\n", file);
if(unlink(file) == -1) {
_alpm_log(PM_LOG_ERROR, _("cannot remove file '%s': %s\n"),
(char *)lp->data, strerror(errno));
}
}
}
int _alpm_remove_commit(pmtrans_t *trans, pmdb_t *db)
{
pmpkg_t *info;
alpm_list_t *targ, *lp;
int pkg_count;
ALPM_LOG_FUNC;
ASSERT(db != NULL, RET_ERR(PM_ERR_DB_NULL, -1));
ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
pkg_count = alpm_list_count(trans->packages);
for(targ = trans->packages; targ; targ = targ->next) {
int position = 0;
char scriptlet[PATH_MAX];
alpm_list_t *files;
info = (pmpkg_t*)targ->data;
const char *pkgname = NULL;
if(handle->trans->state == STATE_INTERRUPTED) {
return(0);
}
/* get the name now so we can use it after package is removed */
pkgname = alpm_pkg_get_name(info);
snprintf(scriptlet, PATH_MAX, "%s%s-%s/install", db->path,
pkgname, alpm_pkg_get_version(info));
if(trans->type != PM_TRANS_TYPE_REMOVEUPGRADE) {
EVENT(trans, PM_TRANS_EVT_REMOVE_START, info, NULL);
_alpm_log(PM_LOG_DEBUG, "removing package %s-%s\n",
pkgname, alpm_pkg_get_version(info));
/* run the pre-remove scriptlet if it exists */
if(alpm_pkg_has_scriptlet(info) && !(trans->flags & PM_TRANS_FLAG_NOSCRIPTLET)) {
_alpm_runscriptlet(handle->root, scriptlet, "pre_remove",
alpm_pkg_get_version(info), NULL, trans);
}
}
files = alpm_pkg_get_files(info);
if(!(trans->flags & PM_TRANS_FLAG_DBONLY)) {
for(lp = files; lp; lp = lp->next) {
if(!can_remove_file(trans, lp->data)) {
_alpm_log(PM_LOG_DEBUG, "not removing package '%s', can't remove all files\n",
pkgname);
RET_ERR(PM_ERR_PKG_CANT_REMOVE, -1);
}
}
int filenum = alpm_list_count(files);
double percent = 0.0;
alpm_list_t *newfiles;
_alpm_log(PM_LOG_DEBUG, "removing %d files\n", filenum);
/* iterate through the list backwards, unlinking files */
newfiles = alpm_list_reverse(files);
for(lp = newfiles; lp; lp = alpm_list_next(lp)) {
unlink_file(info, lp, trans);
/* update progress bar after each file */
percent = (double)position / (double)filenum;
PROGRESS(trans, PM_TRANS_PROGRESS_REMOVE_START, info->name,
(double)(percent * 100), pkg_count,
(pkg_count - alpm_list_count(targ) + 1));
position++;
}
alpm_list_free(newfiles);
}
/* set progress to 100% after we finish unlinking files */
PROGRESS(trans, PM_TRANS_PROGRESS_REMOVE_START, pkgname, 100,
pkg_count, (pkg_count - alpm_list_count(targ) + 1));
if(trans->type != PM_TRANS_TYPE_REMOVEUPGRADE) {
/* run the post-remove script if it exists */
if(alpm_pkg_has_scriptlet(info) && !(trans->flags & PM_TRANS_FLAG_NOSCRIPTLET)) {
_alpm_runscriptlet(handle->root, scriptlet, "post_remove",
alpm_pkg_get_version(info), NULL, trans);
}
}
/* remove the package from the database */
_alpm_log(PM_LOG_DEBUG, "updating database\n");
_alpm_log(PM_LOG_DEBUG, "removing database entry '%s'\n", pkgname);
if(_alpm_db_remove(db, info) == -1) {
_alpm_log(PM_LOG_ERROR, _("could not remove database entry %s-%s\n"),
pkgname, alpm_pkg_get_version(info));
}
/* remove the package from the cache */
if(_alpm_db_remove_pkgfromcache(db, info) == -1) {
_alpm_log(PM_LOG_ERROR, _("could not remove entry '%s' from cache\n"),
pkgname);
}
/* call a done event if this isn't an upgrade */
if(trans->type != PM_TRANS_TYPE_REMOVEUPGRADE) {
EVENT(trans, PM_TRANS_EVT_REMOVE_DONE, info, NULL);
}
}
/* run ldconfig if it exists */
if(trans->type != PM_TRANS_TYPE_REMOVEUPGRADE) {
_alpm_log(PM_LOG_DEBUG, "running \"ldconfig -r %s\"\n", handle->root);
_alpm_ldconfig(handle->root);
}
return(0);
}
/* vim: set ts=2 sw=2 noet: */
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