Add QCOW2 build mechanism (#349)

1 files changed, 81 insertions, 79 deletions

diff --git a/export-image/prerun.sh b/export-image/prerun.sh
index 4b5cf8c..fad7f80 100755
--- a/export-image/prerun.sh
+++ b/export-image/prerun.sh
@@ -1,85 +1,87 @@
 #!/bin/bash -e
 
-IMG_FILE="${STAGE_WORK_DIR}/${IMG_FILENAME}${IMG_SUFFIX}.img"
-
-unmount_image "${IMG_FILE}"
-
-rm -f "${IMG_FILE}"
-
-rm -rf "${ROOTFS_DIR}"
-mkdir -p "${ROOTFS_DIR}"
-
-BOOT_SIZE="$((256 * 1024 * 1024))"
-ROOT_SIZE=$(du --apparent-size -s "${EXPORT_ROOTFS_DIR}" --exclude var/cache/apt/archives --exclude boot --block-size=1 | cut -f 1)
-
-# All partition sizes and starts will be aligned to this size
-ALIGN="$((4 * 1024 * 1024))"
-# Add this much space to the calculated file size. This allows for
-# some overhead (since actual space usage is usually rounded up to the
-# filesystem block size) and gives some free space on the resulting
-# image.
-ROOT_MARGIN="$(echo "($ROOT_SIZE * 0.2 + 200 * 1024 * 1024) / 1" | bc)"
-
-BOOT_PART_START=$((ALIGN))
-BOOT_PART_SIZE=$(((BOOT_SIZE + ALIGN - 1) / ALIGN * ALIGN))
-ROOT_PART_START=$((BOOT_PART_START + BOOT_PART_SIZE))
-ROOT_PART_SIZE=$(((ROOT_SIZE + ROOT_MARGIN + ALIGN  - 1) / ALIGN * ALIGN))
-IMG_SIZE=$((BOOT_PART_START + BOOT_PART_SIZE + ROOT_PART_SIZE))
-
-truncate -s "${IMG_SIZE}" "${IMG_FILE}"
-
-parted --script "${IMG_FILE}" mklabel msdos
-parted --script "${IMG_FILE}" unit B mkpart primary fat32 "${BOOT_PART_START}" "$((BOOT_PART_START + BOOT_PART_SIZE - 1))"
-parted --script "${IMG_FILE}" unit B mkpart primary ext4 "${ROOT_PART_START}" "$((ROOT_PART_START + ROOT_PART_SIZE - 1))"
-
-PARTED_OUT=$(parted -sm "${IMG_FILE}" unit b print)
-BOOT_OFFSET=$(echo "$PARTED_OUT" | grep -e '^1:' | cut -d':' -f 2 | tr -d B)
-BOOT_LENGTH=$(echo "$PARTED_OUT" | grep -e '^1:' | cut -d':' -f 4 | tr -d B)
-
-ROOT_OFFSET=$(echo "$PARTED_OUT" | grep -e '^2:' | cut -d':' -f 2 | tr -d B)
-ROOT_LENGTH=$(echo "$PARTED_OUT" | grep -e '^2:' | cut -d':' -f 4 | tr -d B)
-
-echo "Mounting BOOT_DEV..."
-cnt=0
-until BOOT_DEV=$(losetup --show -f -o "${BOOT_OFFSET}" --sizelimit "${BOOT_LENGTH}" "${IMG_FILE}"); do
-	if [ $cnt -lt 5 ]; then
-		cnt=$((cnt + 1))
-		echo "Error in losetup for BOOT_DEV.  Retrying..."
-		sleep 5
-	else
-		echo "ERROR: losetup for BOOT_DEV failed; exiting"
-		exit 1
-	fi
-done
-
-echo "Mounting ROOT_DEV..."
-cnt=0
-until ROOT_DEV=$(losetup --show -f -o "${ROOT_OFFSET}" --sizelimit "${ROOT_LENGTH}" "${IMG_FILE}"); do
-	if [ $cnt -lt 5 ]; then
-		cnt=$((cnt + 1))
-		echo "Error in losetup for ROOT_DEV.  Retrying..."
-		sleep 5
-	else
-		echo "ERROR: losetup for ROOT_DEV failed; exiting"
-		exit 1
-	fi
-done
-
-echo "/boot: offset $BOOT_OFFSET, length $BOOT_LENGTH"
-echo "/:     offset $ROOT_OFFSET, length $ROOT_LENGTH"
-
-ROOT_FEATURES="^huge_file"
-for FEATURE in metadata_csum 64bit; do
+if [ "${NO_PRERUN_QCOW2}" = "0" ]; then
+	IMG_FILE="${STAGE_WORK_DIR}/${IMG_FILENAME}${IMG_SUFFIX}.img"
+
+	unmount_image "${IMG_FILE}"
+
+	rm -f "${IMG_FILE}"
+
+	rm -rf "${ROOTFS_DIR}"
+	mkdir -p "${ROOTFS_DIR}"
+
+	BOOT_SIZE="$((256 * 1024 * 1024))"
+	ROOT_SIZE=$(du --apparent-size -s "${EXPORT_ROOTFS_DIR}" --exclude var/cache/apt/archives --exclude boot --block-size=1 | cut -f 1)
+
+	# All partition sizes and starts will be aligned to this size
+	ALIGN="$((4 * 1024 * 1024))"
+	# Add this much space to the calculated file size. This allows for
+	# some overhead (since actual space usage is usually rounded up to the
+	# filesystem block size) and gives some free space on the resulting
+	# image.
+	ROOT_MARGIN="$(echo "($ROOT_SIZE * 0.2 + 200 * 1024 * 1024) / 1" | bc)"
+
+	BOOT_PART_START=$((ALIGN))
+	BOOT_PART_SIZE=$(((BOOT_SIZE + ALIGN - 1) / ALIGN * ALIGN))
+	ROOT_PART_START=$((BOOT_PART_START + BOOT_PART_SIZE))
+	ROOT_PART_SIZE=$(((ROOT_SIZE + ROOT_MARGIN + ALIGN  - 1) / ALIGN * ALIGN))
+	IMG_SIZE=$((BOOT_PART_START + BOOT_PART_SIZE + ROOT_PART_SIZE))
+
+	truncate -s "${IMG_SIZE}" "${IMG_FILE}"
+
+	parted --script "${IMG_FILE}" mklabel msdos
+	parted --script "${IMG_FILE}" unit B mkpart primary fat32 "${BOOT_PART_START}" "$((BOOT_PART_START + BOOT_PART_SIZE - 1))"
+	parted --script "${IMG_FILE}" unit B mkpart primary ext4 "${ROOT_PART_START}" "$((ROOT_PART_START + ROOT_PART_SIZE - 1))"
+
+	PARTED_OUT=$(parted -sm "${IMG_FILE}" unit b print)
+	BOOT_OFFSET=$(echo "$PARTED_OUT" | grep -e '^1:' | cut -d':' -f 2 | tr -d B)
+	BOOT_LENGTH=$(echo "$PARTED_OUT" | grep -e '^1:' | cut -d':' -f 4 | tr -d B)
+
+	ROOT_OFFSET=$(echo "$PARTED_OUT" | grep -e '^2:' | cut -d':' -f 2 | tr -d B)
+	ROOT_LENGTH=$(echo "$PARTED_OUT" | grep -e '^2:' | cut -d':' -f 4 | tr -d B)
+
+	echo "Mounting BOOT_DEV..."
+	cnt=0
+	until BOOT_DEV=$(losetup --show -f -o "${BOOT_OFFSET}" --sizelimit "${BOOT_LENGTH}" "${IMG_FILE}"); do
+		if [ $cnt -lt 5 ]; then
+			cnt=$((cnt + 1))
+			echo "Error in losetup for BOOT_DEV.  Retrying..."
+			sleep 5
+		else
+			echo "ERROR: losetup for BOOT_DEV failed; exiting"
+			exit 1
+		fi
+	done
+
+	echo "Mounting ROOT_DEV..."
+	cnt=0
+	until ROOT_DEV=$(losetup --show -f -o "${ROOT_OFFSET}" --sizelimit "${ROOT_LENGTH}" "${IMG_FILE}"); do
+		if [ $cnt -lt 5 ]; then
+			cnt=$((cnt + 1))
+			echo "Error in losetup for ROOT_DEV.  Retrying..."
+			sleep 5
+		else
+			echo "ERROR: losetup for ROOT_DEV failed; exiting"
+			exit 1
+		fi
+	done
+
+	echo "/boot: offset $BOOT_OFFSET, length $BOOT_LENGTH"
+	echo "/:     offset $ROOT_OFFSET, length $ROOT_LENGTH"
+
+	ROOT_FEATURES="^huge_file"
+	for FEATURE in metadata_csum 64bit; do
 	if grep -q "$FEATURE" /etc/mke2fs.conf; then
-	    ROOT_FEATURES="^$FEATURE,$ROOT_FEATURES"
+		ROOT_FEATURES="^$FEATURE,$ROOT_FEATURES"
 	fi
-done
-mkdosfs -n boot -F 32 -v "$BOOT_DEV" > /dev/null
-mkfs.ext4 -L rootfs -O "$ROOT_FEATURES" "$ROOT_DEV" > /dev/null
+	done
+	mkdosfs -n boot -F 32 -v "$BOOT_DEV" > /dev/null
+	mkfs.ext4 -L rootfs -O "$ROOT_FEATURES" "$ROOT_DEV" > /dev/null
 
-mount -v "$ROOT_DEV" "${ROOTFS_DIR}" -t ext4
-mkdir -p "${ROOTFS_DIR}/boot"
-mount -v "$BOOT_DEV" "${ROOTFS_DIR}/boot" -t vfat
+	mount -v "$ROOT_DEV" "${ROOTFS_DIR}" -t ext4
+	mkdir -p "${ROOTFS_DIR}/boot"
+	mount -v "$BOOT_DEV" "${ROOTFS_DIR}/boot" -t vfat
 
-rsync -aHAXx --exclude /var/cache/apt/archives --exclude /boot "${EXPORT_ROOTFS_DIR}/" "${ROOTFS_DIR}/"
-rsync -rtx "${EXPORT_ROOTFS_DIR}/boot/" "${ROOTFS_DIR}/boot/"
+	rsync -aHAXx --exclude /var/cache/apt/archives --exclude /boot "${EXPORT_ROOTFS_DIR}/" "${ROOTFS_DIR}/"
+	rsync -rtx "${EXPORT_ROOTFS_DIR}/boot/" "${ROOTFS_DIR}/boot/"
+fi