Cirrus: Add Second partition for storage testing

This is mainly/initially to support use of Cirrus-CI
in https://github.com/containers/buildah since that setup
re-uses the VM images from this project. However, it also
opens doors here, if libpod ever needs/wants to do things
with a dedicated storage device and/or storage-drivers.

Signed-off-by: Chris Evich <cevich@redhat.com>

1 files changed, 62 insertions, 0 deletions

diff --git a/contrib/cirrus/add_second_partition.sh b/contrib/cirrus/add_second_partition.sh
new file mode 100644
index 000000000..73db192c5
--- /dev/null
+++ b/contrib/cirrus/add_second_partition.sh
@@ -0,0 +1,62 @@
+#!/bin/bash
+
+# N/B: This script could mega f*!@up your disks if run by mistake.
+#      it is left without the execute-bit on purpose!
+
+# $SLASH_DEVICE is the disk device to be f*xtuP
+SLASH_DEVICE="/dev/sda"  # Always the case on GCP
+
+# The unallocated space results from the difference in disk-size between VM Image
+# and runtime request.  The check_image.sh test includes a minimum-space check,
+# with the Image size set initially lower by contrib/cirrus/packer/libpod_images.yml
+NEW_PART_START="50%"
+NEW_PART_END="100%"
+
+set -eo pipefail
+
+source $(dirname $0)/lib.sh
+
+if [[ ! -r "/root" ]] || [[ -r "/root/second_partition_ready" ]]
+then
+    echo "Warning: Ignoring attempted execution of $(basename $0)"
+    exit 0
+fi
+
+[[ -n "type -P parted" ]] || \
+    die 2 "The parted command is required."
+
+[[ ! -b ${SLASH_DEVICE}2 ]] || \
+    die 5 "Found unexpected block device ${SLASH_DEVICE}2"
+
+PPRINTCMD="parted --script ${SLASH_DEVICE} print"
+FINDMNTCMD="findmnt --source=${SLASH_DEVICE}1 --mountpoint=/ --canonicalize --evaluate --first-only --noheadings"
+TMPF=$(mktemp -p '' $(basename $0)_XXXX)
+trap "rm -f $TMPF" EXIT
+
+if $FINDMNTCMD | tee $TMPF | egrep -q "^/\s+${SLASH_DEVICE}1"
+then
+    echo "Repartitioning original partition table:"
+    $PPRINTCMD
+else
+    die 6 "Unexpected output from '$FINDMNTCMD': $(<$TMPF)"
+fi
+
+echo "Adding partition offset within unpartitioned space."
+parted --script --align optimal /dev/sda unit % mkpart primary "" "" "$NEW_PART_START" "$NEW_PART_END"
+
+echo "New partition table:"
+$PPRINTCMD
+
+echo "Growing ${SLASH_DEVICE}1 meet start of ${SLASH_DEVICE}2"
+growpart ${SLASH_DEVICE} 1
+
+FSTYPE=$(findmnt --first-only --noheadings --output FSTYPE ${SLASH_DEVICE}1)
+echo "Expanding $FSTYPE filesystem on ${SLASH_DEVICE}1"
+case $FSTYPE in
+    ext*) resize2fs ${SLASH_DEVICE}1 ;;
+    *) die 11 "Script $(basename $0) doesn't know how to resize a $FSTYPE filesystem." ;;
+esac
+
+# Must happen last - signals completion to other tooling
+echo "Recording newly available disk partition device into /root/second_partition_ready"
+echo "${SLASH_DEVICE}2" > /root/second_partition_ready