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#!/bin/sh -e
is_merged() {
local directories="/bin /sbin /lib"
for dir in $directories; do
[ -e "$DPKG_ROOT$dir" ] || continue
[ "$(readlink -f "$DPKG_ROOT$dir")" = "$DPKG_ROOT/usr$dir" ] || return 1
done
# Avoid an exact match, as the target might vary depending on the tool
# building the image. For example, systemd-nspawn links /lib64 to
# /usr/lib/aarch64-linux-gnu on arm64, while on amd64 debootstrap links it to
# /usr/lib64 and doesn't create it at all on arm64.
# See: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1019575
local arch_directories="/lib64 /lib32 /libo32 /libx32"
for dir in $arch_directories; do
[ -e "$DPKG_ROOT$dir" ] || continue
case "$(readlink -f "$DPKG_ROOT$dir")" in
"$DPKG_ROOT/usr/lib"*) ;;
*) return 1;;
esac
done
return 0
}
fail_if_unmerged() {
if is_merged; then return; fi
cat << END
******************************************************************************
*
* The usr-is-merged package cannot be installed because this system does
* not have a merged /usr.
*
* Please install the usrmerge package to convert this system to merged-/usr.
*
* For more information please read https://wiki.debian.org/UsrMerge.
*
******************************************************************************
END
exit 1
}
case "$1" in
install|upgrade)
fail_if_unmerged
;;
esac
#DEBHELPER#
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