yum-minimal: pre-install coreutils

As described in the referenced bug, the dependency solver in yum
doesn't handle weak dependencies well and in some cases, such as
Fedora 26, can end up choosing coreutils-single (the busybox-esque
single binary) instead of actual coreutils, which then causes problems
with conflicting packages later.

Change-Id: I2907bf3b74c146986b483d52cc6ac437036330b4

diskimage_builder/elements/yum-minimal/root.d/08-yum-chroot

@@ -157,7 +157,8 @@ function _install_pkg_manager {
         flock -w 1200 9 || die "Can not lock .rpmmacros"
         echo "%_dbpath /var/lib/rpm" >> $HOME/.rpmmacros
 
-        _lang_pack=""
+        local _lang_pack=""
+        local _extra_pkgs=""
 
         if [ $DISTRO_NAME = "fedora" -a $DIB_RELEASE -le 23 ]; then
             # _install_langs is a rpm macro that limits the translation
@@ -184,13 +185,21 @@ function _install_pkg_manager {
             _lang_pack="glibc-minimal-langpack glibc-langpack-en"
         fi
 
+        # Yum has some issues choosing weak dependencies.  It can end
+        # up choosing "coreutils-single" instead of "coreutils" which
+        # causes problems later when a package actually requires
+        # coreutils.  For more info see
+        #  https://bugzilla.redhat.com/show_bug.cgi?id=1286445
+        # Really all we can do is pre-install the right thing
+        _extra_pkgs+="coreutils "
+
         sudo -E yum -y \
             --disableexcludes=all \
             --setopt=cachedir=$YUM_CACHE/$ARCH/$DIB_RELEASE \
             --setopt=reposdir=$TARGET_ROOT/etc/yum.repos.d \
             --releasever=$DIB_RELEASE \
             --installroot $TARGET_ROOT \
-            install $@ ${_lang_pack} && rc=$? || rc=$?
+            install $@ ${_lang_pack} ${_extra_pkgs} && rc=$? || rc=$?
 
         # We modified the base system - make sure we clean up always!
         rm $HOME/.rpmmacros.dib.lock