common/travis: make check-install use clean rootdir.

The CI has `base-chroot` installed, but sometimes this script would try
to install `base-system,` causing conflicts. This commit fixes that
issue by using a brand-new rootdir.

common/travis/check-install.sh

@@ -6,20 +6,30 @@ export XBPS_TARGET_ARCH="$2" XBPS_DISTDIR=/hostrepo
 
 if [ "$1" != "$XBPS_TARGET_ARCH" ]; then
 	triplet="$(/hostrepo/xbps-src -a "$XBPS_TARGET_ARCH" show-var XBPS_CROSS_TRIPLET)"
-	ROOTDIR="-r /usr/$triplet"
+	CONFDIR="-C /usr/$triplet/etc/xbps.d"
+else
+	CONFDIR="-C /etc/xbps.d"
 fi
 
+mkdir /check-install
+
+mkdir -p /check-install/var/db/xbps/keys
+cp /var/db/xbps/keys/* /check-install/var/db/xbps/keys/
+
 ADDREPO="--repository=$HOME/hostdir/binpkgs/bootstrap
  --repository=$HOME/hostdir/binpkgs
  --repository=$HOME/hostdir/binpkgs/nonfree"
+ROOTDIR="-r /check-install"
+
+xbps-install $ROOTDIR $ADDREPO $CONFDIR -S
 
 while read -r pkg; do
 	for subpkg in $(xsubpkg $pkg); do
 		/bin/echo -e "\x1b[32mTrying to install dependants of $subpkg:\x1b[0m"
 		for dep in $(xbps-query $ADDREPO -RX "$subpkg"); do
 			xbps-install \
-				$ROOTDIR $ADDREPO \
-				-Sny \
+				$ROOTDIR $ADDREPO $CONFDIR \
+				-ny \
 				"$subpkg" "$(xbps-uhelper getpkgname "$dep")"
 			ret="$?"
 			if [ "$ret" -eq 8 ] || [ "$ret" -eq 11 ]; then