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docs: Updating Developer Guide re qemu-img

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Adding notes re `qemu-img` dependency for non-Docker builds of image

Fixes #2477

Signed-off-by: Dave Hay <david_hay@uk.ibm.com>
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Dave Hay 2021-10-18 15:39:15 +01:00
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docs/Developer-Guide.md
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@ -272,6 +272,7 @@ $ script -fec 'sudo -E USE_DOCKER=true ./image_builder.sh ${ROOTFS_DIR}'
> - If you do *not* wish to build under Docker, remove the `USE_DOCKER`
> variable in the previous command and ensure the `qemu-img` command is
> available on your system.
> - If `qemu-img` is not installed, you will likely see errors such as `ERROR: File /dev/loop19p1 is not a block device` and `losetup: /tmp/tmp.bHz11oY851: Warning: file is smaller than 512 bytes; the loop device may be useless or invisible for system tools`. These can be mitigated by installing the `qemu-img` command (available in the `qemu-img` package on Fedora or the `qemu-utils` package on Debian).
### Install the rootfs image