preinst is in alsa-base 1.0.25+dfsg-0ubuntu4.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | #!/bin/sh
set -e
mv_conffile() {
local package='alsa-base'
local name="$1"
local newname="$2"
[ -e "$name" ] || return 0
local md5="$(md5sum $name | sed -e 's/ .*//')"
oldmd5="$(dpkg-query -W -f='${Conffiles}' $package | \
sed -n -e "\' $name ' { s/ obsolete$//; s/.* //; p }")"
if [ "$md5" = "$oldmd5" ]; then
rm -f "$name"
else
mv "$name" "$newname"
fi
}
rm_conffile() {
mv_conffile "$1" "$1.dpkg-bak"
}
case "$1" in
install|upgrade)
# The following must be deleted at preinst time
# so that dpkg can remove their parent directories
# Delete obsolete dev.d symlinks
for N in 0 1 2 3 4 5 6 7 ; do
D="/etc/dev.d/snd/controlC$N"
if [ -d "$D" ] ; then
L="$D/alsa-base.dev"
rm -f "$L"
fi
done
# Delete obsolete dev.d script
rm_conffile /etc/alsa/dev.d/alsa-base
# Delete obsolete init script
rm_conffile /etc/init.d/alsa
# Delete blacklist without .conf extension
rm_conffile /etc/modprobe.d/blacklist-alsa
rm_conffile /etc/modprobe.d/blacklist-oss
# Rename alsa-base
if dpkg --compare-versions "$2" lt "1.0.23+dfsg-1ubuntu4"; then
rm_conffile /etc/modprobe.d/alsa-base
rm_conffile /etc/modprobe.d/blacklist-modem
fi
;;
esac
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