postinst is in initramfs-tools-core 0.130ubuntu3.
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 | #!/bin/sh
set -e
if [ ! -e /etc/initramfs-tools/modules ]; then
sed '/^###/d' /usr/share/initramfs-tools/modules \
> /etc/initramfs-tools/modules
fi
mvverbose=-v
# from dpkg-maintscript-helper, modified
ensure_package_owns_file() {
local PACKAGE="$1"
local FILE="$2"
dpkg-query -L "$PACKAGE" | grep -F -q -x "$FILE"
}
# from dpkg-maintscript-helper, modified
finish_mv_conffile() {
local CONFFILE="$1"
local PACKAGE="$2"
rm $mvverbose -f "$CONFFILE.dpkg-remove"
[ -e "$CONFFILE.dpkg-backup" ] || return 0
ensure_package_owns_file "$PACKAGE" "$CONFFILE" || return 0
echo "Preserving user changes to $CONFFILE (now owned by $PACKAGE)..."
if [ -e "$CONFFILE" ]; then
mv $mvverbose -f "$CONFFILE" "$CONFFILE.dpkg-new"
fi
mv $mvverbose -f "$CONFFILE.dpkg-backup" "$CONFFILE"
}
# When installing as a new dependency of initramfs-tools, or upgrading
# from <0.123, we need to move initramfs.conf back into place.
if [ "$1" = configure ] && dpkg --compare-versions "$2" lt 0.123~; then
finish_mv_conffile /etc/initramfs-tools/initramfs.conf initramfs-tools-core
fi
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