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pacman/lib/libalpm/conflict.c

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/*
* conflict.c
*
* Copyright (c) 2006-2011 Pacman Development Team <pacman-dev@archlinux.org>
* Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org>
* Copyright (c) 2005 by Aurelien Foret <orelien@chez.com>
* Copyright (c) 2006 by David Kimpe <dnaku@frugalware.org>
* Copyright (c) 2006 by Miklos Vajna <vmiklos@frugalware.org>
* Copyright (c) 2006 by Christian Hamar <krics@linuxforum.hu>
*
* 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 <stdio.h>
#include <string.h>
#include <limits.h>
#include <sys/stat.h>
#include <dirent.h>
/* libalpm */
#include "conflict.h"
#include "alpm_list.h"
#include "alpm.h"
#include "handle.h"
#include "trans.h"
#include "util.h"
#include "log.h"
#include "deps.h"
static alpm_conflict_t *conflict_new(alpm_pkg_t *pkg1, alpm_pkg_t *pkg2,
alpm_depend_t *reason)
{
alpm_conflict_t *conflict;
MALLOC(conflict, sizeof(alpm_conflict_t), return NULL);
conflict->package1_hash = pkg1->name_hash;
conflict->package2_hash = pkg2->name_hash;
STRDUP(conflict->package1, pkg1->name, return NULL);
STRDUP(conflict->package2, pkg2->name, return NULL);
conflict->reason = reason;
return conflict;
}
void _alpm_conflict_free(alpm_conflict_t *conflict)
{
FREE(conflict->package2);
FREE(conflict->package1);
FREE(conflict);
}
alpm_conflict_t *_alpm_conflict_dup(const alpm_conflict_t *conflict)
{
alpm_conflict_t *newconflict;
CALLOC(newconflict, 1, sizeof(alpm_conflict_t), return NULL);
newconflict->package1_hash = conflict->package1_hash;
newconflict->package2_hash = conflict->package2_hash;
STRDUP(newconflict->package1, conflict->package1, return NULL);
STRDUP(newconflict->package2, conflict->package2, return NULL);
newconflict->reason = conflict->reason;
return newconflict;
}
static int conflict_isin(alpm_conflict_t *needle, alpm_list_t *haystack)
{
alpm_list_t *i;
for(i = haystack; i; i = i->next) {
alpm_conflict_t *conflict = i->data;
if(needle->package1_hash == conflict->package1_hash
&& needle->package2_hash == conflict->package2_hash
&& strcmp(needle->package1, conflict->package1) == 0
&& strcmp(needle->package2, conflict->package2) == 0) {
return 1;
}
}
return 0;
}
/** Adds the pkg1/pkg2 conflict to the baddeps list.
* @param handle the context handle
* @param baddeps list to add conflict to
* @param pkg1 first package
* @param pkg2 package causing conflict
* @param reason reason for this conflict
*/
static int add_conflict(alpm_handle_t *handle, alpm_list_t **baddeps,
alpm_pkg_t *pkg1, alpm_pkg_t *pkg2, alpm_depend_t *reason)
{
alpm_conflict_t *conflict = conflict_new(pkg1, pkg2, reason);
if(!conflict) {
return -1;
}
if(!conflict_isin(conflict, *baddeps)) {
char *conflict_str = alpm_dep_compute_string(reason);
*baddeps = alpm_list_add(*baddeps, conflict);
_alpm_log(handle, ALPM_LOG_DEBUG, "package %s conflicts with %s (by %s)\n",
pkg1->name, pkg2->name, conflict_str);
free(conflict_str);
} else {
_alpm_conflict_free(conflict);
}
return 0;
}
/** Check if packages from list1 conflict with packages from list2.
* This looks at the conflicts fields of all packages from list1, and sees
* if they match packages from list2.
* If a conflict (pkg1, pkg2) is found, it is added to the baddeps list
* in this order if order >= 0, or reverse order (pkg2,pkg1) otherwise.
*
* @param handle the context handle
* @param list1 first list of packages
* @param list2 second list of packages
* @param baddeps list to store conflicts
* @param order if >= 0 the conflict order is preserved, if < 0 it's reversed
*/
static void check_conflict(alpm_handle_t *handle,
alpm_list_t *list1, alpm_list_t *list2,
alpm_list_t **baddeps, int order) {
alpm_list_t *i;
if(!baddeps) {
return;
}
for(i = list1; i; i = i->next) {
alpm_pkg_t *pkg1 = i->data;
alpm_list_t *j;
for(j = alpm_pkg_get_conflicts(pkg1); j; j = j->next) {
alpm_depend_t *conflict = j->data;
alpm_list_t *k;
for(k = list2; k; k = k->next) {
alpm_pkg_t *pkg2 = k->data;
if(pkg1->name_hash == pkg2->name_hash
&& strcmp(pkg1->name, pkg2->name) == 0) {
/* skip the package we're currently processing */
continue;
}
if(_alpm_depcmp(pkg2, conflict)) {
if(order >= 0) {
add_conflict(handle, baddeps, pkg1, pkg2, conflict);
} else {
add_conflict(handle, baddeps, pkg2, pkg1, conflict);
}
}
}
}
}
}
/* Check for inter-conflicts */
alpm_list_t *_alpm_innerconflicts(alpm_handle_t *handle, alpm_list_t *packages)
{
alpm_list_t *baddeps = NULL;
_alpm_log(handle, ALPM_LOG_DEBUG, "check targets vs targets\n");
check_conflict(handle, packages, packages, &baddeps, 0);
return baddeps;
}
/* Check for target vs (db - target) conflicts
* In case of conflict the package1 field of pmdepconflict_t contains
* the target package, package2 field contains the local package
*/
alpm_list_t *_alpm_outerconflicts(alpm_db_t *db, alpm_list_t *packages)
{
alpm_list_t *baddeps = NULL;
if(db == NULL) {
return NULL;
}
alpm_list_t *dblist = alpm_list_diff(_alpm_db_get_pkgcache(db),
packages, _alpm_pkg_cmp);
/* two checks to be done here for conflicts */
_alpm_log(db->handle, ALPM_LOG_DEBUG, "check targets vs db\n");
check_conflict(db->handle, packages, dblist, &baddeps, 1);
_alpm_log(db->handle, ALPM_LOG_DEBUG, "check db vs targets\n");
check_conflict(db->handle, dblist, packages, &baddeps, -1);
alpm_list_free(dblist);
return baddeps;
}
/** Check the package conflicts in a database
*
* @param handle the context handle
* @param pkglist the list of packages to check
* @return an alpm_list_t of alpm_conflict_t
*/
alpm_list_t SYMEXPORT *alpm_checkconflicts(alpm_handle_t *handle,
alpm_list_t *pkglist)
{
CHECK_HANDLE(handle, return NULL);
return _alpm_innerconflicts(handle, pkglist);
}
static const int DIFFERENCE = 0;
static const int INTERSECT = 1;
/* Returns a set operation on the provided two lists of files.
* Pre-condition: both lists are sorted!
* When done, free the list but NOT the contained data.
*
* Operations:
* DIFFERENCE - a difference operation is performed. filesA - filesB.
* INTERSECT - an intersection operation is performed. filesA & filesB.
*/
static alpm_list_t *filelist_operation(alpm_filelist_t *filesA,
alpm_filelist_t *filesB, int operation)
{
alpm_list_t *ret = NULL;
size_t ctrA = 0, ctrB = 0;
while(ctrA < filesA->count && ctrB < filesB->count) {
alpm_file_t *fileA = filesA->files + ctrA;
alpm_file_t *fileB = filesB->files + ctrB;
const char *strA = fileA->name;
const char *strB = fileB->name;
/* skip directories, we don't care about them */
if(strA[strlen(strA)-1] == '/') {
ctrA++;
} else if(strB[strlen(strB)-1] == '/') {
ctrB++;
} else {
int cmp = strcmp(strA, strB);
if(cmp < 0) {
if(operation == DIFFERENCE) {
/* item only in filesA, qualifies as a difference */
ret = alpm_list_add(ret, fileA);
}
ctrA++;
} else if(cmp > 0) {
ctrB++;
} else {
if(operation == INTERSECT) {
/* item in both, qualifies as an intersect */
ret = alpm_list_add(ret, fileA);
}
ctrA++;
ctrB++;
}
}
}
/* if doing a difference, ensure we have completely emptied pA */
while(operation == DIFFERENCE && ctrA < filesA->count) {
alpm_file_t *fileA = filesA->files + ctrA;
const char *strA = fileA->name;
/* skip directories */
if(strA[strlen(strA)-1] != '/') {
ret = alpm_list_add(ret, fileA);
}
ctrA++;
}
return ret;
}
/* Adds alpm_fileconflict_t to a conflicts list. Pass the conflicts list, type
* (either ALPM_FILECONFLICT_TARGET or ALPM_FILECONFLICT_FILESYSTEM), a file
* string, and either two package names or one package name and NULL. This is
* a wrapper for former functionality that was done inline.
*/
static alpm_list_t *add_fileconflict(alpm_handle_t *handle,
alpm_list_t *conflicts, alpm_fileconflicttype_t type, const char *filestr,
const char *name1, const char *name2)
{
alpm_fileconflict_t *conflict;
MALLOC(conflict, sizeof(alpm_fileconflict_t), goto error);
conflict->type = type;
STRDUP(conflict->target, name1, goto error);
STRDUP(conflict->file, filestr, goto error);
if(name2) {
STRDUP(conflict->ctarget, name2, goto error);
} else {
STRDUP(conflict->ctarget, "", goto error);
}
conflicts = alpm_list_add(conflicts, conflict);
_alpm_log(handle, ALPM_LOG_DEBUG, "found file conflict %s, packages %s and %s\n",
filestr, name1, name2 ? name2 : "(filesystem)");
return conflicts;
error:
RET_ERR(handle, ALPM_ERR_MEMORY, conflicts);
}
void _alpm_fileconflict_free(alpm_fileconflict_t *conflict)
{
FREE(conflict->ctarget);
FREE(conflict->file);
FREE(conflict->target);
FREE(conflict);
}
const alpm_file_t *_alpm_filelist_contains(alpm_filelist_t *filelist,
const char *name)
{
size_t i;
const alpm_file_t *file = filelist->files;
for(i = 0; i < filelist->count; i++) {
if(strcmp(file->name, name) == 0) {
return file;
}
file++;
}
return NULL;
}
static int dir_belongsto_pkg(const char *root, const char *dirpath,
alpm_pkg_t *pkg)
{
struct stat sbuf;
char path[PATH_MAX];
char abspath[PATH_MAX];
struct dirent *ent = NULL;
DIR *dir;
snprintf(abspath, PATH_MAX, "%s%s", root, dirpath);
dir = opendir(abspath);
if(dir == NULL) {
return 1;
}
while((ent = readdir(dir)) != NULL) {
const char *name = ent->d_name;
if(strcmp(name, ".") == 0 || strcmp(name, "..") == 0) {
continue;
}
snprintf(path, PATH_MAX, "%s/%s", dirpath, name);
snprintf(abspath, PATH_MAX, "%s%s", root, path);
if(stat(abspath, &sbuf) != 0) {
continue;
}
if(S_ISDIR(sbuf.st_mode)) {
if(dir_belongsto_pkg(root, path, pkg)) {
continue;
} else {
closedir(dir);
return 0;
}
} else {
if(_alpm_filelist_contains(alpm_pkg_get_files(pkg), path)) {
continue;
} else {
closedir(dir);
return 0;
}
}
}
closedir(dir);
return 1;
}
/* Find file conflicts that may occur during the transaction with two checks:
* 1: check every target against every target
* 2: check every target against the filesystem */
alpm_list_t *_alpm_db_find_fileconflicts(alpm_handle_t *handle,
alpm_list_t *upgrade, alpm_list_t *remove)
{
alpm_list_t *i, *conflicts = NULL;
size_t numtargs = alpm_list_count(upgrade);
size_t current;
alpm_trans_t *trans = handle->trans;
if(!upgrade) {
return NULL;
}
/* TODO this whole function needs a huge change, which hopefully will
* be possible with real transactions. Right now we only do half as much
* here as we do when we actually extract files in add.c with our 12
* different cases. */
for(current = 0, i = upgrade; i; i = i->next, current++) {
alpm_pkg_t *p1 = i->data;
alpm_list_t *j;
alpm_filelist_t tmpfiles;
alpm_pkg_t *dbpkg;
size_t filenum;
int percent = (current * 100) / numtargs;
PROGRESS(trans, ALPM_TRANS_PROGRESS_CONFLICTS_START, "", percent,
numtargs, current);
/* CHECK 1: check every target against every target */
_alpm_log(handle, ALPM_LOG_DEBUG, "searching for file conflicts: %s\n",
alpm_pkg_get_name(p1));
for(j = i->next; j; j = j->next) {
alpm_list_t *common_files;
alpm_pkg_t *p2 = j->data;
common_files = filelist_operation(alpm_pkg_get_files(p1),
alpm_pkg_get_files(p2), INTERSECT);
if(common_files) {
alpm_list_t *k;
char path[PATH_MAX];
for(k = common_files; k; k = k->next) {
snprintf(path, PATH_MAX, "%s%s", handle->root, (char *)k->data);
conflicts = add_fileconflict(handle, conflicts,
ALPM_FILECONFLICT_TARGET, path,
alpm_pkg_get_name(p1), alpm_pkg_get_name(p2));
if(handle->pm_errno == ALPM_ERR_MEMORY) {
FREELIST(conflicts);
FREELIST(common_files);
return NULL;
}
}
alpm_list_free(common_files);
}
}
/* CHECK 2: check every target against the filesystem */
_alpm_log(handle, ALPM_LOG_DEBUG, "searching for filesystem conflicts: %s\n",
p1->name);
dbpkg = _alpm_db_get_pkgfromcache(handle->db_local, p1->name);
/* Do two different checks here. If the package is currently installed,
* then only check files that are new in the new package. If the package
* is not currently installed, then simply stat the whole filelist. Note
* that the former list needs to be freed while the latter list should NOT
* be freed. */
if(dbpkg) {
alpm_list_t *difference;
/* older ver of package currently installed */
difference = filelist_operation(alpm_pkg_get_files(p1),
alpm_pkg_get_files(dbpkg), DIFFERENCE);
tmpfiles.count = alpm_list_count(difference);
tmpfiles.files = alpm_list_to_array(difference, tmpfiles.count,
sizeof(alpm_file_t));
alpm_list_free(difference);
} else {
/* no version of package currently installed */
tmpfiles = *alpm_pkg_get_files(p1);
}
for(filenum = 0; filenum < tmpfiles.count; filenum++) {
alpm_file_t *file = tmpfiles.files + filenum;
const char *filestr = file->name;
const char *relative_path;
alpm_list_t *k;
/* have we acted on this conflict? */
int resolved_conflict = 0;
struct stat lsbuf;
char path[PATH_MAX];
snprintf(path, PATH_MAX, "%s%s", handle->root, filestr);
/* stat the file - if it exists, do some checks */
if(_alpm_lstat(path, &lsbuf) != 0) {
continue;
}
if(S_ISDIR(file->mode)) {
struct stat sbuf;
if(S_ISDIR(lsbuf.st_mode)) {
_alpm_log(handle, ALPM_LOG_DEBUG, "%s is a directory, not a conflict\n", path);
continue;
}
stat(path, &sbuf);
if(S_ISLNK(lsbuf.st_mode) && S_ISDIR(sbuf.st_mode)) {
_alpm_log(handle, ALPM_LOG_DEBUG,
"%s is a symlink to a dir, hopefully not a conflict\n", path);
continue;
}
/* if we made it to here, we want all subsequent path comparisons to
* not include the trailing slash. This allows things like file ->
* directory replacements. */
path[strlen(path) - 1] = '\0';
}
_alpm_log(handle, ALPM_LOG_DEBUG, "checking possible conflict: %s\n", path);
relative_path = path + strlen(handle->root);
/* Check remove list (will we remove the conflicting local file?) */
for(k = remove; k && !resolved_conflict; k = k->next) {
alpm_pkg_t *rempkg = k->data;
if(rempkg && _alpm_filelist_contains(alpm_pkg_get_files(rempkg),
relative_path)) {
_alpm_log(handle, ALPM_LOG_DEBUG,
"local file will be removed, not a conflict: %s\n", path);
resolved_conflict = 1;
}
}
/* Look at all the targets to see if file has changed hands */
for(k = upgrade; k && !resolved_conflict; k = k->next) {
alpm_pkg_t *p2 = k->data;
if(!p2 || strcmp(p1->name, p2->name) == 0) {
continue;
}
alpm_pkg_t *localp2 = _alpm_db_get_pkgfromcache(handle->db_local, p2->name);
/* localp2->files will be removed (target conflicts are handled by CHECK 1) */
if(localp2 && _alpm_filelist_contains(alpm_pkg_get_files(localp2), filestr)) {
/* skip removal of file, but not add. this will prevent a second
* package from removing the file when it was already installed
* by its new owner (whether the file is in backup array or not */
handle->trans->skip_remove =
alpm_list_add(handle->trans->skip_remove, strdup(filestr));
_alpm_log(handle, ALPM_LOG_DEBUG,
"file changed packages, adding to remove skiplist: %s\n", path);
resolved_conflict = 1;
}
}
/* check if all files of the dir belong to the installed pkg */
if(!resolved_conflict && S_ISDIR(lsbuf.st_mode) && dbpkg) {
char *dir = malloc(strlen(filestr) + 2);
sprintf(dir, "%s/", filestr);
if(_alpm_filelist_contains(alpm_pkg_get_files(dbpkg), dir)) {
_alpm_log(handle, ALPM_LOG_DEBUG,
"check if all files in %s belongs to %s\n",
dir, dbpkg->name);
resolved_conflict = dir_belongsto_pkg(handle->root, filestr, dbpkg);
}
free(dir);
}
if(!resolved_conflict && dbpkg) {
char *rpath = calloc(PATH_MAX, sizeof(char));
const char *relative_rpath;
if(!realpath(path, rpath)) {
free(rpath);
continue;
}
relative_rpath = rpath + strlen(handle->root);
if(_alpm_filelist_contains(alpm_pkg_get_files(dbpkg), relative_rpath)) {
resolved_conflict = 1;
}
free(rpath);
}
/* is the file unowned and in the backup list of the new package? */
if(!resolved_conflict && _alpm_needbackup(filestr, p1)) {
alpm_list_t *local_pkgs = _alpm_db_get_pkgcache(handle->db_local);
int found = 0;
for(k = local_pkgs; k && !found; k = k->next) {
if(_alpm_filelist_contains(alpm_pkg_get_files(k->data), filestr)) {
found = 1;
}
}
if(!found) {
_alpm_log(handle, ALPM_LOG_DEBUG,
"file was unowned but in new backup list: %s\n", path);
resolved_conflict = 1;
}
}
if(!resolved_conflict) {
conflicts = add_fileconflict(handle, conflicts,
ALPM_FILECONFLICT_FILESYSTEM, path, p1->name, NULL);
if(handle->pm_errno == ALPM_ERR_MEMORY) {
FREELIST(conflicts);
if(dbpkg) {
/* only freed if it was generated from filelist_operation() */
free(tmpfiles.files);
}
return NULL;
}
}
}
if(dbpkg) {
/* only freed if it was generated from filelist_operation() */
free(tmpfiles.files);
}
}
PROGRESS(trans, ALPM_TRANS_PROGRESS_CONFLICTS_START, "", 100,
numtargs, current);
return conflicts;
}
/* vim: set ts=2 sw=2 noet: */
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