centos-mirror-update: handle non-x86 architectures

CentOS keeps non-x86 architectures in /altarch/ directory (contrary to
/centos/ one for x86-64). We have aarch64 (arm64) machines in infra and
they fail due to lack of CentOS altarch mirror.

List of wanted alternative architectures is controlled by ALTARCHS
variable (aarch64 and ppc64le enabled). As CentOS has several other
architectures too they are listed in ALTARCHS_IGNORED so we do not fetch
them.

Current CentOS mirror lands in same /mirror/centos/7/ directory. Altarch
mirrors goes to /mirror/centos/altarch/7/ one.

Change-Id: I0e110ef51c8ed301fd8280ae7fc039e3b01db92c

modules/openstack_project/files/mirror/centos-mirror-update.sh

@@ -24,28 +24,50 @@ fi
 
 BASE="/afs/.openstack.org/mirror/centos"
 MIRROR="rsync://mirror.lstn.net"
+MIRROR_ALTARCH="rsync://mirror.freethought-internet.co.uk/centos-altarch/"
 K5START="k5start -t -f /etc/centos.keytab service/centos-mirror -- $TIMEOUT"
 
-REPO=7
-if ! [ -f $BASE/$REPO ]; then
-    $K5START mkdir -p $BASE/$REPO
-fi
+REPOS="7 altarch/7"
+ALTARCHS="aarch64 ppc64le"
+ALTARCHS_IGNORED="armhfp i386 power9 ppc64 x86_64" # altarch/kernel/ has x86_64 dir we do not want
 
-date --iso-8601=ns
-echo "Running rsync..."
-$K5START rsync -rlptDvz \
+for REPO in $REPOS; do
+    if ! [ -f $BASE/$REPO ]; then
+        $K5START mkdir -p $BASE/$REPO
+    fi
+
+    MIRROR_PATH=$MIRROR/$REPO/
+    EXTRA_OPTS="--links" # -l
+    if [[ $REPO == "altarch"* ]]; then
+        MIRROR_PATH=$MIRROR_ALTARCH/7/
+        EXTRA_OPTS="--copy-links" # copy because altarch has symlinks to ../7.6.1810/
+
+        for arch in $ALTARCHS_IGNORED; do
+            EXTRA_OPTS="$EXTRA_OPTS --exclude=$arch"
+        done
+        for arch in $ALTARCHS; do
+            EXTRA_OPTS="$EXTRA_OPTS --include *.${arch}.rpm"
+        done
+    fi
+
+    date --iso-8601=ns
+    echo "Running rsync..."
+    $K5START rsync -rptDvz \
     --delete \
     --delete-excluded \
     --exclude="atomic" \
     --exclude="centosplus" \
+    --exclude="experimental" \
     --exclude="fasttrack" \
     --exclude="isos" \
     --exclude="paas" \
     --exclude="sclo" \
-    --exclude="x86_64/drpms" \
-    $MIRROR/centos/$REPO/ $BASE/$REPO/
+    --exclude="*/drpms" \
+    $EXTRA_OPTS \
+    $MIRROR_PATH $BASE/$REPO/
 
-# TODO(pabelanger): Validate rsync process
+    # TODO(pabelanger): Validate rsync process
+done
 
 date --iso-8601=ns | $K5START tee $BASE/timestamp.txt
 echo "rsync completed successfully, running vos release."