Allow fileconflict if unowned file moving into backup array

The bulk of this commit is adding new tests to ensure the new behavior
works without disrupting old behavior. This is a relatively sane maneuver
when a package adds a conf file (e.g. '/etc/mercurial/hgrc') that was
not previously in the package, but it is placed in the backup array. In
essence, we can treat the existing file as having always been a part of
the package and do our normal compare/install as pacnew logic checks.

Signed-off-by: Dan McGee <dan@archlinux.org>

5 files changed, 23 insertions, 8 deletions

diff --git a/lib/libalpm/add.c b/lib/libalpm/add.c
index e1827469..5e1bb8da 100644
--- a/lib/libalpm/add.c
+++ b/lib/libalpm/add.c
@@ -255,7 +255,7 @@ static int extract_single_file(alpm_handle_t *handle, struct archive *archive,
 				alpm_backup_t *backup;
 				/* go to the backup array and see if our conflict is there */
 				/* check newpkg first, so that adding backup files is retroactive */
-				backup = _alpm_needbackup(entryname, alpm_pkg_get_backup(newpkg));
+				backup = _alpm_needbackup(entryname, newpkg);
 				if(backup) {
 					/* if we force hash_orig to be non-NULL retroactive backup works */
 					hash_orig = "";
@@ -264,7 +264,7 @@ static int extract_single_file(alpm_handle_t *handle, struct archive *archive,
 
 				/* check oldpkg for a backup entry, store the hash if available */
 				if(oldpkg) {
-					backup = _alpm_needbackup(entryname, alpm_pkg_get_backup(oldpkg));
+					backup = _alpm_needbackup(entryname, oldpkg);
 					if(backup) {
 						hash_orig = backup->hash;
 						needbackup = 1;
diff --git a/lib/libalpm/backup.c b/lib/libalpm/backup.c
index becc7be9..728c1d05 100644
--- a/lib/libalpm/backup.c
+++ b/lib/libalpm/backup.c
@@ -58,16 +58,15 @@ int _alpm_split_backup(const char *string, alpm_backup_t **backup)
 /* Look for a filename in a alpm_pkg_t.backup list. If we find it,
  * then we return the full backup entry.
  */
-alpm_backup_t *_alpm_needbackup(const char *file, const alpm_list_t *backup_list)
+alpm_backup_t *_alpm_needbackup(const char *file, alpm_pkg_t *pkg)
 {
 	const alpm_list_t *lp;
 
-	if(file == NULL || backup_list == NULL) {
+	if(file == NULL || pkg == NULL) {
 		return NULL;
 	}
 
-	/* run through the backup list and parse out the hash for our file */
-	for(lp = backup_list; lp; lp = lp->next) {
+	for(lp = alpm_pkg_get_backup(pkg); lp; lp = lp->next) {
 		alpm_backup_t *backup = lp->data;
 
 		if(strcmp(file, backup->name) == 0) {
diff --git a/lib/libalpm/backup.h b/lib/libalpm/backup.h
index 39c01a6d..0b84a68c 100644
--- a/lib/libalpm/backup.h
+++ b/lib/libalpm/backup.h
@@ -24,7 +24,7 @@
 #include "alpm.h"
 
 int _alpm_split_backup(const char *string, alpm_backup_t **backup);
-alpm_backup_t *_alpm_needbackup(const char *file, const alpm_list_t *backup_list);
+alpm_backup_t *_alpm_needbackup(const char *file, alpm_pkg_t *pkg);
 void _alpm_backup_free(alpm_backup_t *backup);
 alpm_backup_t *_alpm_backup_dup(const alpm_backup_t *backup);
 
diff --git a/lib/libalpm/conflict.c b/lib/libalpm/conflict.c
index 8cf16191..eda6ba10 100644
--- a/lib/libalpm/conflict.c
+++ b/lib/libalpm/conflict.c
@@ -549,6 +549,22 @@ alpm_list_t *_alpm_db_find_fileconflicts(alpm_handle_t *handle,
 				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);
diff --git a/lib/libalpm/remove.c b/lib/libalpm/remove.c
index 5d2256d3..b15dbaa5 100644
--- a/lib/libalpm/remove.c
+++ b/lib/libalpm/remove.c
@@ -255,7 +255,7 @@ static void unlink_file(alpm_handle_t *handle, alpm_pkg_t *info,
 		}
 	} else {
 		/* if the file needs backup and has been modified, back it up to .pacsave */
-		alpm_backup_t *backup = _alpm_needbackup(fileobj->name, alpm_pkg_get_backup(info));
+		alpm_backup_t *backup = _alpm_needbackup(fileobj->name, info);
 		if(backup) {
 			if(nosave) {
 				_alpm_log(handle, ALPM_LOG_DEBUG, "transaction is set to NOSAVE, not backing up '%s'\n", file);