Move skipping of duplicate sync/remove targets into libalpm

sync:
As pointed out by Andrew Gregory there could be an error when adding
duplicates if they are two separate packages with the same name. Add a
check in alpm_add_pkg() to test whether the duplicate is actually the
same package, and if so, log a debug message and return success to skip
the package. If the duplicate is a different package return
ALPM_ERR_TRANS_DUP_TARGET and treat that error just like any other error
in pacman.

remove:
Change alpm_remove_pkg() to just log a debug message and return success
to skip duplicates. Remove the handling of ALPM_ERR_TRANS_DUP_TARGET in
pacman.

Also fixes FS#49377.

Suggested-by: Andrew Gregory <andrew.gregory.8@gmail.com>
Signed-off-by: Michael Straube <michael.straube@posteo.de>
Signed-off-by: Allan McRae <allan@archlinux.org>

4 files changed, 13 insertions, 19 deletions

diff --git a/lib/libalpm/add.c b/lib/libalpm/add.c
index e415bb17..c39f9ecf 100644
--- a/lib/libalpm/add.c
+++ b/lib/libalpm/add.c
@@ -53,6 +53,7 @@ int SYMEXPORT alpm_add_pkg(alpm_handle_t *handle, alpm_pkg_t *pkg)
 	const char *pkgname, *pkgver;
 	alpm_trans_t *trans;
 	alpm_pkg_t *local;
+	alpm_pkg_t *dup;
 
 	/* Sanity checks */
 	CHECK_HANDLE(handle, return -1);
@@ -70,7 +71,12 @@ int SYMEXPORT alpm_add_pkg(alpm_handle_t *handle, alpm_pkg_t *pkg)
 
 	_alpm_log(handle, ALPM_LOG_DEBUG, "adding package '%s'\n", pkgname);
 
-	if(alpm_pkg_find(trans->add, pkgname)) {
+	if((dup = alpm_pkg_find(trans->add, pkgname))) {
+		if(dup == pkg) {
+			_alpm_log(handle, ALPM_LOG_DEBUG, "skipping duplicate target: %s\n", pkgname);
+			return 0;
+		}
+		/* error for separate packages with the same name */
 		RET_ERR(handle, ALPM_ERR_TRANS_DUP_TARGET, -1);
 	}
 
diff --git a/lib/libalpm/remove.c b/lib/libalpm/remove.c
index 78ca5be7..50de4649 100644
--- a/lib/libalpm/remove.c
+++ b/lib/libalpm/remove.c
@@ -74,7 +74,8 @@ int SYMEXPORT alpm_remove_pkg(alpm_handle_t *handle, alpm_pkg_t *pkg)
 	pkgname = pkg->name;
 
 	if(alpm_pkg_find(trans->remove, pkgname)) {
-		RET_ERR(handle, ALPM_ERR_TRANS_DUP_TARGET, -1);
+		_alpm_log(handle, ALPM_LOG_DEBUG, "skipping duplicate target: %s\n", pkgname);
+		return 0;
 	}
 
 	_alpm_log(handle, ALPM_LOG_DEBUG, "adding package %s to the transaction remove list\n",
diff --git a/src/pacman/remove.c b/src/pacman/remove.c
index a2269ed8..9d44cf53 100644
--- a/src/pacman/remove.c
+++ b/src/pacman/remove.c
@@ -44,14 +44,8 @@ static int remove_target(const char *target)
 	if((pkg = alpm_db_get_pkg(db_local, target)) != NULL) {
 		if(alpm_remove_pkg(config->handle, pkg) == -1) {
 			alpm_errno_t err = alpm_errno(config->handle);
-			if(err == ALPM_ERR_TRANS_DUP_TARGET) {
-				/* just skip duplicate targets */
-				pm_printf(ALPM_LOG_WARNING, _("skipping target: %s\n"), target);
-				return 0;
-			} else {
-				pm_printf(ALPM_LOG_ERROR, "'%s': %s\n", target, alpm_strerror(err));
-				return -1;
-			}
+			pm_printf(ALPM_LOG_ERROR, "'%s': %s\n", target, alpm_strerror(err));
+			return -1;
 		}
 		config->explicit_removes = alpm_list_add(config->explicit_removes, pkg);
 		return 0;
diff --git a/src/pacman/sync.c b/src/pacman/sync.c
index 57677a42..2406fed5 100644
--- a/src/pacman/sync.c
+++ b/src/pacman/sync.c
@@ -521,15 +521,8 @@ static int process_pkg(alpm_pkg_t *pkg)
 
 	if(ret == -1) {
 		alpm_errno_t err = alpm_errno(config->handle);
-		if(err == ALPM_ERR_TRANS_DUP_TARGET) {
-			/* just skip duplicate targets */
-			pm_printf(ALPM_LOG_WARNING, _("skipping target: %s\n"), alpm_pkg_get_name(pkg));
-			return 0;
-		} else {
-			pm_printf(ALPM_LOG_ERROR, "'%s': %s\n", alpm_pkg_get_name(pkg),
-					alpm_strerror(err));
-			return 1;
-		}
+		pm_printf(ALPM_LOG_ERROR, "'%s': %s\n", alpm_pkg_get_name(pkg), alpm_strerror(err));
+		return 1;
 	}
 	config->explicit_adds = alpm_list_add(config->explicit_adds, pkg);
 	return 0;