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Go Back   Linux Archive > ArchLinux > ArchLinux Pacman Development

 
 
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Old 11-26-2007, 03:04 PM
Nagy Gabor
 
Default libalpm/sync.c : conflicts resolving cleanup.

The original patch from Nagy tried to resolve target vs target conflicts,
and so broke the following pactests :
sync040, sync041 and sync990

Nagy's proposal to solve this situation was to choose the interactive way,
ask the user how to deal with it:
either remove pkg1 or remove pkg2 or stop here.
So he left this as a TODO.

But instead of trying to resolve these conflicts or asking the user, I
simply made pacman fail in this case. It's simpler, and still acceptable in
my opinion. However, this broke the following pactests :
sync893, sync897, sync898, sync992, sync999
But some of them are rather strange..
Reference:
http://www.archlinux.org/pipermail/pacman-dev/2007-October/009745.html

Signed-off-by: Chantry Xavier <shiningxc@gmail.com>
---
lib/libalpm/sync.c | 222 +++++++++++++++-------------------------------------
1 files changed, 62 insertions(+), 160 deletions(-)

diff --git a/lib/libalpm/sync.c b/lib/libalpm/sync.c
index f6fa318..a2bc39c 100644
--- a/lib/libalpm/sync.c
+++ b/lib/libalpm/sync.c
@@ -385,20 +385,6 @@ int _alpm_sync_addtarget(pmtrans_t *trans, pmdb_t *db_local, alpm_list_t *dbs_sy
return(0);
}

-/* Helper functions for alpm_list_remove
- */
-static int syncpkg_cmp(const void *s1, const void *s2)
-{
- const pmsyncpkg_t *sp1 = s1;
- const pmsyncpkg_t *sp2 = s2;
- pmpkg_t *p1, *p2;
-
- p1 = alpm_sync_get_pkg(sp1);
- p2 = alpm_sync_get_pkg(sp2);
-
- return(strcmp(alpm_pkg_get_name(p1), alpm_pkg_get_name(p2)));
-}
-
int _alpm_sync_prepare(pmtrans_t *trans, pmdb_t *db_local, alpm_list_t *dbs_sync, alpm_list_t **data)
{
alpm_list_t *deps = NULL;
@@ -490,170 +476,86 @@ int _alpm_sync_prepare(pmtrans_t *trans, pmdb_t *db_local, alpm_list_t *dbs_sync
EVENT(trans, PM_TRANS_EVT_INTERCONFLICTS_START, NULL, NULL);

_alpm_log(PM_LOG_DEBUG, "looking for conflicts
");
- deps = _alpm_checkconflicts(db_local, list);
+
+ /* 1. check for conflicts in the target list */
+ _alpm_log(PM_LOG_DEBUG, "check targets vs targets
");
+ deps = _alpm_innerconflicts(list);
+
+ /* TODO : should we try to resolve targets vs targets conflicts? */
if(deps) {
- int errorout = 0;
- alpm_list_t *asked = NULL;
- pmconflict_t *conflict = NULL;
-
- for(i = deps; i && !errorout; i = i->next) {
- pmsyncpkg_t *sync;
- pmpkg_t *found = NULL;
-
- conflict = i->data;
- _alpm_log(PM_LOG_DEBUG, "package '%s' conflicts with '%s'
",
- conflict->package1, conflict->package2);
- /* check if the conflicting package is about to be removed/replaced.
- * if so, then just ignore it. */
- for(j = trans->packages; j && !found; j = j->next) {
- sync = j->data;
- if(sync->type == PM_SYNC_TYPE_REPLACE) {
- found = _alpm_pkg_find(conflict->package2, sync->data);
- }
- }
- if(found) {
- _alpm_log(PM_LOG_DEBUG, "'%s' is already elected for removal -- skipping
",
- alpm_pkg_get_name(found));
- continue;
- }
+ pm_errno = PM_ERR_CONFLICTING_DEPS;
+ ret = -1;
+ *data = deps;
+ goto cleanup;
+ }

- sync = _alpm_sync_find(trans->packages, conflict->package1);
- if(sync == NULL) {
- _alpm_log(PM_LOG_DEBUG, "'%s' not found in transaction set -- skipping
",
- conflict->package1);
- continue;
- }
- pmpkg_t *local = _alpm_db_get_pkgfromcache(db_local, conflict->package2);
- /* check if this package provides the package it's conflicting with */
- if(alpm_list_find(alpm_pkg_get_provides(sync->pkg),
- conflict->package2, _alpm_prov_cmp)) {
- /* treat like a replaces item so requiredby fields are
- * inherited properly. */
- _alpm_log(PM_LOG_DEBUG, "package '%s' provides its own conflict
",
- conflict->package1);
- if(!local) {
- char *rmpkg = NULL;
- int target, depend;
- /* hmmm, package2 isn't installed, so it must be conflicting
- * with another package in our final list. For example:
- *
- * pacman -S blackbox xfree86
- *
- * If no x-servers are installed and blackbox pulls in xorg, then
- * xorg and xfree86 will conflict with each other. In this case,
- * we should follow the user's preference and rip xorg out of final,
- * opting for xfree86 instead.
- */
-
- /* figure out which one was requested in targets. If they both
- * were, then it's still an unresolvable conflict. */
- target = alpm_list_find_str(trans->targets, conflict->package1);
- depend = alpm_list_find_str(trans->targets, conflict->package2);
- if(depend && !target) {
- _alpm_log(PM_LOG_DEBUG, "'%s' is in the target list -- keeping it
",
- conflict->package2);
- /* remove conflict->package1 */
- rmpkg = conflict->package1;
- } else if(target && !depend) {
- _alpm_log(PM_LOG_DEBUG, "'%s' is in the target list -- keeping it
",
- conflict->package1);
- /* remove conflict->package2 */
- rmpkg = conflict->package2;
- } else {
- /* miss->target2 is not needed, miss->target already provides
- * it, let's resolve the conflict */
- rmpkg = conflict->package2;
- }
- if(rmpkg) {
- pmsyncpkg_t *rsync = _alpm_sync_find(trans->packages, rmpkg);
- void *vpkg;
- _alpm_log(PM_LOG_DEBUG, "removing '%s' from target list
",
- rsync->pkg->name);
- trans->packages = alpm_list_remove(trans->packages, rsync,
- syncpkg_cmp, &vpkg);
- _alpm_sync_free(vpkg);
- continue;
- }
+ /* 2. we check for target vs db conflicts (and resolve)*/
+ _alpm_log(PM_LOG_DEBUG, "check targets vs db and db vs targets
");
+ deps = _alpm_outerconflicts(db_local, list);
+
+ for(i = deps; i; i = i->next) {
+ pmconflict_t *conflict = i->data;
+
+ /* if conflict->package2 (the local package) is not elected for removal,
+ we ask the user */
+ int found = 0;
+ for(j = trans->packages; j && !found; j = j->next) {
+ pmsyncpkg_t *sync = j->data;
+ if(sync->type == PM_SYNC_TYPE_REPLACE) {
+ if(_alpm_pkg_find(conflict->package2, sync->data)) {
+ found = 1;
}
}
- /* It's a conflict -- see if they want to remove it */
- _alpm_log(PM_LOG_DEBUG, "resolving package '%s' conflict
",
- conflict->package1);
- if(local) {
- int doremove = 0;
- if(!alpm_list_find_str(asked, conflict->package2)) {
- QUESTION(trans, PM_TRANS_CONV_CONFLICT_PKG, conflict->package1,
+ }
+ if(found) {
+ continue;
+ }
+
+ _alpm_log(PM_LOG_DEBUG, "package '%s' conflicts with '%s'
",
+ conflict->package1, conflict->package2);
+
+ pmsyncpkg_t *sync = _alpm_sync_find(trans->packages, conflict->package1);
+ pmpkg_t *local = _alpm_db_get_pkgfromcache(db_local, conflict->package2);
+ int doremove = 0;
+ QUESTION(trans, PM_TRANS_CONV_CONFLICT_PKG, conflict->package1,
conflict->package2, NULL, &doremove);
- asked = alpm_list_add(asked, strdup(conflict->package2));
- if(doremove) {
- pmpkg_t *q = _alpm_pkg_dup(local);
- if(sync->type != PM_SYNC_TYPE_REPLACE) {
- /* switch this sync type to REPLACE */
- sync->type = PM_SYNC_TYPE_REPLACE;
- _alpm_pkg_free(sync->data);
- sync->data = NULL;
- }
- /* append to the replaces list */
- _alpm_log(PM_LOG_DEBUG, "electing '%s' for removal
",
- conflict->package2);
- sync->data = alpm_list_add(sync->data, q);
- /* see if the package is in the current target list */
- pmsyncpkg_t *rsync = _alpm_sync_find(trans->packages,
- conflict->package2);
- if(rsync) {
- /* remove it from the target list */
- void *vpkg;
- _alpm_log(PM_LOG_DEBUG, "removing '%s' from target list
",
- conflict->package2);
- trans->packages = alpm_list_remove(trans->packages, rsync,
- syncpkg_cmp, &vpkg);
- _alpm_sync_free(vpkg);
- }
- } else {
- /* abort */
- _alpm_log(PM_LOG_ERROR, _("unresolvable package conflicts detected
"));
- errorout = 1;
- }
- }
- } else {
- _alpm_log(PM_LOG_ERROR, _("unresolvable package conflicts detected
"));
- errorout = 1;
+ if(doremove) {
+ pmpkg_t *q = _alpm_pkg_dup(local);
+ if(sync->type != PM_SYNC_TYPE_REPLACE) {
+ /* switch this sync type to REPLACE */
+ sync->type = PM_SYNC_TYPE_REPLACE;
+ _alpm_pkg_free(sync->data);
+ sync->data = NULL;
}
- }
- if(errorout) {
- /* The last conflict was unresolvable, so we duplicate it and add it to *data */
- pm_errno = PM_ERR_CONFLICTING_DEPS;
+ /* append to the replaces list */
+ _alpm_log(PM_LOG_DEBUG, "electing '%s' for removal
", conflict->package2);
+ sync->data = alpm_list_add(sync->data, q);
+ } else { /* abort */
+ _alpm_log(PM_LOG_ERROR, _("unresolvable package conflicts detected
"));
if(data) {
- pmconflict_t *lastconflict = conflict;
- if((conflict = malloc(sizeof(pmconflict_t))) == NULL) {
- _alpm_log(PM_LOG_ERROR, _("malloc failure: could not allocate %zd bytes
"),
- sizeof(pmconflict_t));
+ pmconflict_t *retconflict;
+ if((retconflict = malloc(sizeof(pmconflict_t))) == NULL) {
+ _alpm_log(PM_LOG_ERROR, _("malloc failure: could not allocate %zd bytes
"), sizeof(pmconflict_t));
FREELIST(*data);
pm_errno = PM_ERR_MEMORY;
- } else {
- *conflict = *lastconflict;
- *data = alpm_list_add(*data, conflict);
+ ret = -1;
+ goto cleanup;
}
+ *retconflict = *conflict;
+ *data = alpm_list_add(*data, retconflict);
}
- FREELIST(asked);
- FREELIST(deps);
+ pm_errno = PM_ERR_CONFLICTING_DEPS;
ret = -1;
+ FREELIST(deps);
goto cleanup;
}
- FREELIST(asked);
- FREELIST(deps);
}
EVENT(trans, PM_TRANS_EVT_INTERCONFLICTS_DONE, NULL, NULL);
+ FREELIST(deps);
}

if(!(trans->flags & PM_TRANS_FLAG_NODEPS)) {
- /* rebuild remove and list */
- alpm_list_free(list);
- list = NULL;
- for(i = trans->packages; i; i = i->next) {
- pmsyncpkg_t *sync = i->data;
- list = alpm_list_add(list, sync->pkg);
- }
+ /* rebuild remove list */
alpm_list_free(remove);
remove = NULL;
for(i = trans->packages; i; i = i->next) {
@@ -670,7 +572,7 @@ int _alpm_sync_prepare(pmtrans_t *trans, pmdb_t *db_local, alpm_list_t *dbs_sync
if(deps) {
pm_errno = PM_ERR_UNSATISFIED_DEPS;
ret = -1;
- FREELIST(deps);
+ *data = deps;
goto cleanup;
}
}
--
1.5.3.6


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