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docs: add hint of probing loop module

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If `loop` module is not probed, it causes error like "losetup: cannot find an unused loop device".

Fixes: #5887
Signed-off-by: Guoqiang Ding <dgq8211@gmail.com>
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Guoqiang Ding 2022-12-05 22:05:54 +08:00
parent 8246de821f
commit f8a48ab41d
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docs/Developer-Guide.md
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@ -292,6 +292,7 @@ $ popd
> 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).
> - If `loop` module is not probed, you will likely see errors such as `losetup: cannot find an unused loop device`. Execute `modprobe loop` could resolve it.
### Install the rootfs image