add QCOW2 build mechanism
Holger Pandel
parent
a449c75fac
commit
78904cbf2e
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@ -6,7 +6,7 @@ RUN apt-get -y update && \
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apt-get -y install \
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git vim parted \
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quilt coreutils qemu-user-static debootstrap zerofree zip dosfstools \
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bsdtar libcap2-bin rsync grep udev xz-utils curl xxd file kmod\
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bsdtar libcap2-bin rsync grep udev xz-utils curl xxd file kmod qemu-utils kpartx\
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&& rm -rf /var/lib/apt/lists/*
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COPY . /pi-gen/
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98
README.md
98
README.md
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@ -14,7 +14,7 @@ To install the required dependencies for pi-gen you should run:
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```bash
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apt-get install coreutils quilt parted qemu-user-static debootstrap zerofree zip \
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dosfstools bsdtar libcap2-bin grep rsync xz-utils file git curl
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dosfstools bsdtar libcap2-bin grep rsync xz-utils file git curl qemu-utils kpartx
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```
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The file `depends` contains a list of tools needed. The format of this
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@ -36,6 +36,37 @@ The following environment variables are supported:
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but you should use something else for a customized version. Export files
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in stages may add suffixes to `IMG_NAME`.
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* `USE_QCOW2`(Default: `1` )
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Instead of using traditional way of building the rootfs of every stage in
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single subdirectories and copying over the previous one to the next one,
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qcow2 based virtual disks with backing images are used in every stage.
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This speeds up the build process and reduces overall space consumption
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significantly.
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<u>Additional optional parameters regarding qcow2 build:</u>
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* `BASE_QCOW2_SIZE` (Default: 12G)
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Size of the virtual qcow2 disk.
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Note: it will not actually use that much of space at once but defines the
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maximum size of the virtual disk. If you change the build process by adding
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a lot of bigger packages or additional build stages, it can be necessary to
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increase the value because the virtual disk can run out of space like a normal
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hard drive would.
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* `NBD_DEV` (Default: auto eval)
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The virtual qcow2 disk has to be attached to a special network block device (NBD)
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so that it can be accessed like any other disk. Normally a free device node will be
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evaluated automatically. If you want to predefine a device node set this parameter
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in your `config` file like so:
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`ǸBD_DEV=/dev/nbd1`.
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**CAUTION:** Although the qcow2 build mechanism will run fine inside Docker, it can happen
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that the network block device is not disconnected correctly after the Docker process has
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ended abnormally. In that case see [Disconnect an image if something went wrong](#Disconnect-an-image-if-something-went-wrong)
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* `APT_PROXY` (Default: unset)
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If you require the use of an apt proxy, set it here. This proxy setting
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@ -324,6 +355,71 @@ follows:
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* Once you're happy with the image you can remove the SKIP_IMAGES files and
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export your image to test
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# Regarding Qcow2 image building
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### Get infos about the image in use
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If you issue the two commands shown in the example below in a second command shell while a build
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is running you can find out, which network block device is currently being used and which qcow2 image
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is bound to it.
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Example:
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```bash
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root@build-machine:~/$ lsblk | grep nbd
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nbd1 43:32 0 10G 0 disk
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├─nbd1p1 43:33 0 10G 0 part
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└─nbd1p1 253:0 0 10G 0 part
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root@build-machine:~/$ ps xa | grep qemu-nbd
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2392 pts/6 S+ 0:00 grep --color=auto qemu-nbd
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31294 ? Ssl 0:12 qemu-nbd --discard=unmap -c /dev/nbd1 image-stage4.qcow2
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```
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Here you can see, that the qcow2 image `image-stage4.qcow2` is currently connected to `/dev/nbd1` with
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the associated partition map `/dev/mapper/nbd1p1`. Don't worry that `lsblk` shows two entries. It is totally fine, because the device map is accessible via `/dev/mapper/nbd1p1` and also via `/dev/dm-0`. This is all part of the device mapper functionality of the kernel. See `dmsetup` for further information.
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### Mount a qcow2 image
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If you want to examine the content of a a single stage, you can simply mount the qcow2 image found in the `WORK_DIR` directory with the tool `./imagetool.sh`.
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See `./imagetool.sh -h` for further details on how to use it.
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### Disconnect an image if something went wrong
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It can happen, that your build stops in case of an error. Normally `./build.sh` should handle image disconnection appropriately, but in rare cases, especially during a Docker build, this may not work as expected. If that happens, starting a new build will fail and you may have to disconnect the image and/or device yourself.
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A typical message indicating that there are some orphaned device mapper entries is this:
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```
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Failed to set NBD socket
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Disconnect client, due to: Unexpected end-of-file before all bytes were read
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```
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If that happens go through the following steps:
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1. First, check if the image is somehow mounted to a directory entry and umount it as you would any other block device, like i.e. a hard disk or USB stick.
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2. Second, to disconnect an image from `qemu-nbd`, the QEMU Disk Network Block Device Server, issue the following command (be sure to change the device name to the one actually used):
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```bash
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sudo qemu-nbd -d /dev/nbd1
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```
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Note: if you use Docker build, normally no active `qemu-nbd` process exists anymore as it will be terminated when the Docker container stops.
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3. To disconnect a device partition map from the network block device, execute:
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```bash
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sudo kpartx -d /dev/nbd1
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or
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sudo ./imagetool.sh --cleanup
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```
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Note: The `imagetool.sh` command will cleanup any /dev/nbdX that is not connected to a running `qemu-nbd` daemon. Be careful if you use network block devices for other tasks utilizing NBDs on your build machine as well.
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Now you should be able to start a new build without running into troubles again. Most of the time, especially when using Docker build, you will only need no. 3 to get everything up and running again.
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# Troubleshooting
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## `64 Bit Systems`
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@ -1,4 +1,5 @@
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#!/bin/bash -eu
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DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
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BUILD_OPTS="$*"
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@ -77,6 +78,9 @@ ${DOCKER} build -t pi-gen "${DIR}"
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if [ "${CONTAINER_EXISTS}" != "" ]; then
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trap 'echo "got CTRL+C... please wait 5s" && ${DOCKER} stop -t 5 ${CONTAINER_NAME}_cont' SIGINT SIGTERM
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time ${DOCKER} run --rm --privileged \
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--cap-add=ALL \
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-v /dev:/dev \
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-v /lib/modules:/lib/modules \
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--volume "${CONFIG_FILE}":/config:ro \
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-e "GIT_HASH=${GIT_HASH}" \
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--volumes-from="${CONTAINER_NAME}" --name "${CONTAINER_NAME}_cont" \
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@ -88,6 +92,9 @@ if [ "${CONTAINER_EXISTS}" != "" ]; then
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else
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trap 'echo "got CTRL+C... please wait 5s" && ${DOCKER} stop -t 5 ${CONTAINER_NAME}' SIGINT SIGTERM
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time ${DOCKER} run --name "${CONTAINER_NAME}" --privileged \
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--cap-add=ALL \
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-v /dev:/dev \
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-v /lib/modules:/lib/modules \
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--volume "${CONFIG_FILE}":/config:ro \
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-e "GIT_HASH=${GIT_HASH}" \
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pi-gen \
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@ -96,6 +103,7 @@ else
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rsync -av work/*/build.log deploy/" &
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wait "$!"
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fi
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echo "copying results from deploy/"
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${DOCKER} cp "${CONTAINER_NAME}":/pi-gen/deploy .
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ls -lah deploy
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72
build.sh
72
build.sh
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@ -1,4 +1,7 @@
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#!/bin/bash -e
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#set -x
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# shellcheck disable=SC2119
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run_sub_stage()
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{
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@ -22,6 +25,11 @@ EOF
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on_chroot << EOF
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apt-get install --no-install-recommends -y $PACKAGES
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EOF
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if [ "${USE_QCOW2}" = "1" ]; then
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on_chroot << EOF
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apt-get clean
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EOF
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fi
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fi
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log "End ${SUB_STAGE_DIR}/${i}-packages-nr"
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fi
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@ -32,6 +40,11 @@ EOF
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on_chroot << EOF
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apt-get install -y $PACKAGES
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EOF
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if [ "${USE_QCOW2}" = "1" ]; then
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on_chroot << EOF
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apt-get clean
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EOF
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fi
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fi
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log "End ${SUB_STAGE_DIR}/${i}-packages"
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fi
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@ -82,17 +95,27 @@ EOF
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run_stage(){
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log "Begin ${STAGE_DIR}"
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STAGE="$(basename "${STAGE_DIR}")"
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pushd "${STAGE_DIR}" > /dev/null
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unmount "${WORK_DIR}/${STAGE}"
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STAGE_WORK_DIR="${WORK_DIR}/${STAGE}"
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ROOTFS_DIR="${STAGE_WORK_DIR}"/rootfs
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if [ "${USE_QCOW2}" = "1" ]; then
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if [ ! -f SKIP ]; then
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load_qimage
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fi
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else
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unmount "${WORK_DIR}/${STAGE}"
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fi
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if [ ! -f SKIP_IMAGES ]; then
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if [ -f "${STAGE_DIR}/EXPORT_IMAGE" ]; then
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EXPORT_DIRS="${EXPORT_DIRS} ${STAGE_DIR}"
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fi
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fi
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if [ ! -f SKIP ]; then
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if [ "${CLEAN}" = "1" ]; then
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if [ "${CLEAN}" = "1" ] && [ "${USE_QCOW2}" = "0" ] ; then
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if [ -d "${ROOTFS_DIR}" ]; then
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rm -rf "${ROOTFS_DIR}"
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fi
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@ -109,7 +132,13 @@ run_stage(){
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fi
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done
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fi
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unmount "${WORK_DIR}/${STAGE}"
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if [ "${USE_QCOW2}" = "1" ]; then
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unload_qimage
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else
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unmount "${WORK_DIR}/${STAGE}"
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fi
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PREV_STAGE="${STAGE}"
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PREV_STAGE_DIR="${STAGE_DIR}"
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PREV_ROOTFS_DIR="${ROOTFS_DIR}"
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@ -141,6 +170,15 @@ do
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esac
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done
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term() {
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if [ "${USE_QCOW2}" = "1" ]; then
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log "Unloading image"
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unload_qimage
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fi
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}
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trap term EXIT INT TERM
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export PI_GEN=${PI_GEN:-pi-gen}
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export PI_GEN_REPO=${PI_GEN_REPO:-https://github.com/RPi-Distro/pi-gen}
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@ -208,6 +246,10 @@ source "${SCRIPT_DIR}/common"
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# shellcheck source=scripts/dependencies_check
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source "${SCRIPT_DIR}/dependencies_check"
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export USE_QCOW2="${USE_QCOW2:-1}"
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export BASE_QCOW2_SIZE=${BASE_QCOW2_SIZE:-12G}
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source "${SCRIPT_DIR}/qcow2_handling"
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dependencies_check "${BASE_DIR}/depends"
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#check username is valid
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@ -237,13 +279,29 @@ for EXPORT_DIR in ${EXPORT_DIRS}; do
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# shellcheck source=/dev/null
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source "${EXPORT_DIR}/EXPORT_IMAGE"
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EXPORT_ROOTFS_DIR=${WORK_DIR}/$(basename "${EXPORT_DIR}")/rootfs
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run_stage
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QIMAGE="image-$(basename "${EXPORT_DIR}").qcow2"
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if [ "${USE_QCOW2}" = "1" ]; then
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USE_QCOW2=0
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mount_qimage "${WORK_DIR}/${QIMAGE}" "${EXPORT_ROOTFS_DIR}"
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echo "Mounting image ${WORK_DIR}/${QIMAGE} to export rootfs ${EXPORT_ROOTFS_DIR}"
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run_stage
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unload_qimage
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USE_QCOW2=1
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else
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run_stage
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fi
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if [ "${USE_QEMU}" != "1" ]; then
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if [ -e "${EXPORT_DIR}/EXPORT_NOOBS" ]; then
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# shellcheck source=/dev/null
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source "${EXPORT_DIR}/EXPORT_NOOBS"
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STAGE_DIR="${BASE_DIR}/export-noobs"
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run_stage
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if [ "${USE_QCOW2}" = "1" ]; then
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USE_QCOW2=0
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run_stage
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USE_QCOW2=1
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else
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run_stage
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fi
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fi
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fi
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done
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@ -255,4 +313,8 @@ if [ -x postrun.sh ]; then
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log "End postrun.sh"
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fi
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if [ "${USE_QCOW2}" = "1" ]; then
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unload_qimage
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fi
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log "End ${BASE_DIR}"
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@ -95,7 +95,16 @@ if [ "${DEPLOY_ZIP}" == "1" ]; then
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"$(basename "${IMG_FILE}")"
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popd > /dev/null
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else
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cp "$IMG_FILE" "$DEPLOY_DIR"
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if [ "${USE_QCOW2}" = "1" ]; then
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mv "$IMG_FILE" "$DEPLOY_DIR/"
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else
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cp "$IMG_FILE" "$DEPLOY_DIR"
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fi
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fi
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if [ "${USE_QCOW2}" = "1" ]; then
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mv "$INFO_FILE" "$DEPLOY_DIR/"
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else
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cp "$INFO_FILE" "$DEPLOY_DIR"
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fi
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cp "$INFO_FILE" "$DEPLOY_DIR"
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@ -39,4 +39,8 @@ sed "${NOOBS_DIR}/os.json" -i -e "s|NOOBS_DESCRIPTION|${NOOBS_DESCRIPTION}|"
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sed "${NOOBS_DIR}/release_notes.txt" -i -e "s|UNRELEASED|${IMG_DATE}|"
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cp -a "${NOOBS_DIR}" "${DEPLOY_DIR}/"
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if [ "${USE_QCOW2}" = "1" ]; then
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mv "${NOOBS_DIR}" "${DEPLOY_DIR}/"
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else
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cp -a "${NOOBS_DIR}" "${DEPLOY_DIR}/"
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fi
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@ -1,11 +1,15 @@
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#!/bin/bash -e
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IMG_FILE="${STAGE_WORK_DIR}/${IMG_FILENAME}${IMG_SUFFIX}.img"
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NOOBS_DIR="${STAGE_WORK_DIR}/${IMG_DATE}-${IMG_NAME}${IMG_SUFFIX}"
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unmount_image "${IMG_FILE}"
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mkdir -p "${STAGE_WORK_DIR}"
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cp "${WORK_DIR}/export-image/${IMG_FILENAME}${IMG_SUFFIX}.img" "${STAGE_WORK_DIR}/"
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if [ "${USE_QCOW2}" = "1" ]; then
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IMG_FILE="${WORK_DIR}/export-image/${IMG_FILENAME}${IMG_SUFFIX}.img"
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else
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cp "${WORK_DIR}/export-image/${IMG_FILENAME}${IMG_SUFFIX}.img" "${STAGE_WORK_DIR}/"
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IMG_FILE="${STAGE_WORK_DIR}/${IMG_FILENAME}${IMG_SUFFIX}.img"
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fi
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unmount_image "${IMG_FILE}"
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rm -rf "${NOOBS_DIR}"
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@ -0,0 +1,112 @@
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#!/bin/bash
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if [ "$(id -u)" != "0" ]; then
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echo "Please run as root" 1>&2
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exit 1
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fi
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progname=$(basename $0)
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function usage()
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{
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cat << HEREDOC
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Usage:
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Mount Image : $progname [--mount] [--image-name <path to qcow2 image>] [--mount-point <mount point>]
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Umount Image: $progname [--umount] [--mount-point <mount point>]
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Cleanup NBD : $progname [--cleanup]
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arguments:
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-h, --help show this help message and exit
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-c, --cleanup cleanup orphaned device mappings
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-m, --mount mount image
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-u, --umount umount image
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-i, --image-name path to qcow2 image
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-p, --mount-point mount point for image
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This tool will use /dev/nbd1 as default for mounting an image. If you want to use another device, execute like this:
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NBD_DEV=/dev/nbd2 ./$progname --mount --image <your image> --mount-point <your path>
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HEREDOC
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}
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MOUNT=0
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UMOUNT=0
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IMAGE=""
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MOUNTPOINT=""
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nbd_cleanup() {
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DEVS="$(lsblk | grep nbd | grep disk | cut -d" " -f1)"
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if [ ! -z "${DEVS}" ]; then
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for d in $DEVS; do
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if [ ! -z "${d}" ]; then
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QDEV="$(ps xa | grep $d | grep -v grep)"
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if [ -z "${QDEV}" ]; then
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kpartx -d /dev/$d && echo "Unconnected device map removed: /dev/$d"
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fi
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fi
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done
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fi
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}
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# As long as there is at least one more argument, keep looping
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while [[ $# -gt 0 ]]; do
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key="$1"
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case "$key" in
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-h|--help)
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usage
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exit
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;;
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-c|--cleanup)
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nbd_cleanup
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;;
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-m|--mount)
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MOUNT=1
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;;
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-u|--umount)
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UMOUNT=1
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;;
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-i|--image-name)
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shift
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IMAGE="$1"
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;;
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-p|--mount-point)
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shift
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MOUNTPOINT="$1"
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;;
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*)
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echo "Unknown option '$key'"
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usage
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exit
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;;
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esac
|
||||
# Shift after checking all the cases to get the next option
|
||||
shift
|
||||
done
|
||||
|
||||
if [ "${MOUNT}" = "1" ] && [ "${UMOUNT}" = "1" ]; then
|
||||
usage
|
||||
echo "Concurrent mount options not possible."
|
||||
exit
|
||||
fi
|
||||
|
||||
if [ "${MOUNT}" = "1" ] && ([ -z "${IMAGE}" ] || [ -z "${MOUNTPOINT}" ]); then
|
||||
usage
|
||||
echo "Can not mount image. Image path and/or mount point missing."
|
||||
exit
|
||||
fi
|
||||
|
||||
if [ "${UMOUNT}" = "1" ] && [ -z "${MOUNTPOINT}" ]; then
|
||||
usage
|
||||
echo "Can not umount. Mount point parameter missing."
|
||||
exit
|
||||
fi
|
||||
|
||||
export NBD_DEV="${NBD_DEV:-/dev/nbd1}"
|
||||
source scripts/qcow2_handling
|
||||
|
||||
if [ "${MOUNT}" = "1" ]; then
|
||||
mount_qimage "${MOUNTPOINT}" "${IMAGE}"
|
||||
elif [ "${UMOUNT}" = "1" ]; then
|
||||
umount_qimage "${MOUNTPOINT}"
|
||||
fi
|
||||
|
|
@ -0,0 +1,96 @@
|
|||
# QCOW2 Routines
|
||||
|
||||
export CURRENT_IMAGE
|
||||
export CURRENT_MOUNTPOINT
|
||||
|
||||
# set in build.sh
|
||||
# should be fairly enough for the beginning
|
||||
# overwrite here by uncommenting following lines
|
||||
# BASE_QCOW2_SIZE=12G
|
||||
|
||||
init_nbd() {
|
||||
modprobe nbd max_part=16
|
||||
if [ -z "${NBD_DEV}" ]; then
|
||||
for x in /sys/class/block/nbd* ; do
|
||||
S=`cat $x/size`
|
||||
if [ "$S" == "0" ] ; then
|
||||
NBD_DEV=/dev/$(basename $x)
|
||||
MAP_DEV=/dev/mapper/$(basename $x)p1
|
||||
break
|
||||
fi
|
||||
done
|
||||
fi
|
||||
}
|
||||
|
||||
# mount qcow2 image: mount_image <image file> <mountpoint>
|
||||
mount_qimage() {
|
||||
init_nbd
|
||||
qemu-nbd --discard=unmap -c $NBD_DEV "$1"
|
||||
kpartx -a $NBD_DEV
|
||||
mount $MAP_DEV "$2"
|
||||
CURRENT_IMAGE="$1"
|
||||
CURRENT_MOUNTPOINT="$2"
|
||||
}
|
||||
export -f mount_qimage
|
||||
|
||||
# umount qcow2 image: umount_image <current mountpoint>
|
||||
umount_qimage() {
|
||||
while mount | grep -q "$1"; do
|
||||
local LOCS
|
||||
LOCS=$(mount | grep "$1" | cut -f 3 -d ' ' | sort -r)
|
||||
for loc in $LOCS; do
|
||||
echo "$loc"
|
||||
umount "$loc"
|
||||
done
|
||||
done
|
||||
qemu-nbd -d $NBD_DEV
|
||||
kpartx -d $NBD_DEV
|
||||
}
|
||||
export -f umount_qimage
|
||||
|
||||
# create base image / backing image / mount image
|
||||
load_qimage() {
|
||||
if [ -z "${CURRENT_MOUNTPOINT}" ]; then
|
||||
if [ ! -d "${ROOTFS_DIR}" ]; then mkdir -p "${ROOTFS_DIR}"; fi
|
||||
|
||||
if [ "${CLEAN}" = "1" ] && [ -f "${WORK_DIR}/image-${STAGE}.qcow2" ]; then rm -f "${WORK_DIR}/image-${STAGE}.qcow2"; fi
|
||||
|
||||
if [ ! -f "${WORK_DIR}/image-${STAGE}.qcow2" ]; then
|
||||
pushd ${WORK_DIR} > /dev/null
|
||||
init_nbd
|
||||
if [ -z "${PREV_STAGE}" ]; then
|
||||
qemu-img create -f qcow2 image-${STAGE}.qcow2 $BASE_QCOW2_SIZE
|
||||
qemu-nbd --discard=unmap -c $NBD_DEV image-${STAGE}.qcow2
|
||||
echo 'type=83' | sfdisk $NBD_DEV
|
||||
kpartx -a $NBD_DEV
|
||||
mkfs.ext4 $MAP_DEV
|
||||
else
|
||||
if [ ! -f "${WORK_DIR}/image-${PREV_STAGE}.qcow2" ]; then exit 1; fi
|
||||
qemu-img create -f qcow2 \
|
||||
-o backing_file=${WORK_DIR}/image-${PREV_STAGE}.qcow2 \
|
||||
${WORK_DIR}/image-${STAGE}.qcow2
|
||||
qemu-nbd --discard=unmap -c $NBD_DEV image-${STAGE}.qcow2
|
||||
kpartx -a $NBD_DEV
|
||||
fi
|
||||
mount $MAP_DEV "${ROOTFS_DIR}"
|
||||
CURRENT_IMAGE=${WORK_DIR}/image-${STAGE}.qcow2
|
||||
CURRENT_MOUNTPOINT=${ROOTFS_DIR}
|
||||
popd > /dev/null
|
||||
else
|
||||
mount_qimage "${WORK_DIR}/image-${STAGE}.qcow2" "${ROOTFS_DIR}"
|
||||
fi
|
||||
echo "Current image in use: ${CURRENT_IMAGE} (MP: ${CURRENT_MOUNTPOINT})"
|
||||
fi
|
||||
}
|
||||
export -f load_qimage
|
||||
|
||||
# umount current image and refresh mount point env var
|
||||
unload_qimage() {
|
||||
if [ ! -z "${CURRENT_MOUNTPOINT}" ]; then
|
||||
fstrim -v "${CURRENT_MOUNTPOINT}" || true
|
||||
umount_qimage "${CURRENT_MOUNTPOINT}"
|
||||
CURRENT_IMAGE=""
|
||||
CURRENT_MOUNTPOINT=""
|
||||
fi
|
||||
}
|
||||
export -f unload_qimage
|
||||
|
|
@ -1,5 +1,5 @@
|
|||
#!/bin/bash -e
|
||||
|
||||
if [ ! -d "${ROOTFS_DIR}" ]; then
|
||||
if [ ! -d "${ROOTFS_DIR}" ] || [ "${USE_QCOW2}" = "1" ]; then
|
||||
bootstrap buster "${ROOTFS_DIR}" http://raspbian.raspberrypi.org/raspbian/
|
||||
fi
|
||||
|
|
|
|||
Loading…
Reference in New Issue