nixos-install: don't check that /mnt is a mount point

Changed files
-5
nixos
modules
installer
-5
nixos/modules/installer/tools/nixos-install.sh
···
exit 1
fi
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if ! grep -F -q " $mountPoint " /proc/mounts; then
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echo "$mountPoint doesn't appear to be a mount point"
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exit 1
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fi
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# Mount some stuff in the target root directory.
mkdir -m 0755 -p $mountPoint/dev $mountPoint/proc $mountPoint/sys $mountPoint/etc $mountPoint/run $mountPoint/home