forked from josch/mmdebstrap
mmdebstrap-autopkgtest-build-qemu: add reasons for image being raw and not qcow2
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@ -298,6 +298,16 @@ WORKDIR=$(mktemp -d)
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FAT_OFFSET_SECTORS=$((1024*2))
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FAT_SIZE_SECTORS=$((1024*254))
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# The image is raw and not in qcow2 format because:
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# - faster run-time as the "qemu-image convert" step is not needed
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# - image can be used independent of qemu tooling
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# - modifying the image just with "mount" instead of requiring qemu-nbd
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# - sparse images make the file just as small as with qcow2
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# - trim support is more difficult on qcow2
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# - snapshots and overlays work just as well with raw images
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# - users who prefer qcow2 get to choose to run it themselves with their own
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# custom options like compression
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#
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# Make the image writeable to the first subgid. mmdebstrap will map this gid to
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# the root group. unshare instead will map the current gid to 0 and the first
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# subgid to 1. Therefore mmdebstrap will be able to write to the image.
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