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Explain why we copy out of the mount

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Graham Christensen 2020-06-08 09:59:02 -04:00
parent 2986dec150
commit 344485d836
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@ -57,6 +57,12 @@ in
mkdir "/mnt-root/nix/.squash/$dest" mkdir "/mnt-root/nix/.squash/$dest"
mount -t squashfs -o loop "$f" "/mnt-root/nix/.squash/$dest" mount -t squashfs -o loop "$f" "/mnt-root/nix/.squash/$dest"
( (
# Ideally, these would not be copied and the mounts would be
# used directly. However, we can't: systemd tries to unmount
# them all at shutdown and gets stuck. The trade-off here is
# an increased RAM requirement and a slightly slower
# start-up. However, all that is much faster than needing
# to recreate the entire squashfs every time.
cd /mnt-root/nix/store/ cd /mnt-root/nix/store/
cp -ar "../.squash/$dest/$dest" "./$dest" cp -ar "../.squash/$dest/$dest" "./$dest"
) )