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qemu_boot requires xz-compressed images to live in /tmp #201
Description
i'm just starting with CustomPiOS, and i'm a bit stumped on how to use qemu_boot.
- no help or whatsoever
it would be really nice if startingqemu_boot.shwithout any arguments (or with-h; or with a non-existing file) to output some usage information - it apparently requires the image to be passed either as ZIP-compressed archive or an XZ-compressed image - why is it not possible to use a raw (uncompressed) image, such as created by
build_dist - when using a ZIP-compressed archive the image has to be the first entry in the archive (I don't know whether this is also a requirement by rpi-imager, but it would be nice to have this documented)
- when using an XZ-compressed image, it must live in
/tmpotherwise the uncompressed image won't be found
Activity
[-]qemu_boot requires a compressed image in /tmp[/-][+]qemu_boot requires xz-compressed images to live in /tmp[/+]umlaeute commentedon Aug 31, 2023
also, from checking the code it seems that the image-name (unless it is a zip-file) must not contain the sequence
xzpreceded by an arbitrary character:CustomPiOS/src/qemu_boot.sh
Line 15 in f6fea14
e.g.
the correct sed-expression would be
"s/\.xz$//", but i think a much better way would be to use POSIX parameter expansion:IMG_NAME=$(basename "${ZIP_IMG%.xz}")guysoft commentedon Aug 31, 2023
Hey, you are quite right. I initially wrote qemu_boot as a quick hack and it really has the place to become something more useful and well documented.
I am not sure how much time I have to do that now. Perhaps adding an if args<0 and to print help would be a good start. I would really welcome a PR if you have time for that.
umlaeute commentedon Aug 31, 2023
i might :-)
sidenote: shouldn't
qemu_boot.shandqemu_boot64.shbe virtually identical (obviously apart from the CPU/kernel/dtb/...)?guysoft commentedon Sep 2, 2023
Yes, though I update which kernel is used since they changed over time. They could be joined in to one script
umlaeute commentedon Sep 7, 2023
i found https://github.com/bablokb/pi-qemu-helper which seems to be a better alternative to your scripts (as it also supports booting with a GUI)
guysoft commentedon Sep 7, 2023
Cool - if you have some example of what commands to run on a .zip file to get a running emulation we could add that to the wiki.
Also I am interested too :)