postinst is in ubuntu-keyring 2011.11.21.
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 | #!/bin/sh
# the keyring in /var that gets fetched by apt-key net-update
# if it does not yet exist, copy it to avoid uneeded net copy
KEYRINGDIR="/var/lib/apt/keyrings"
KEYRING="${KEYRINGDIR}/ubuntu-archive-keyring.gpg"
if ! test -d $KEYRINGDIR; then
mkdir -m 755 -p $KEYRINGDIR
fi
if ! test -f $KEYRING; then
cp /usr/share/keyrings/ubuntu-archive-keyring.gpg $KEYRING
touch $KEYRING
fi
# sensible default permissions if there is no keyring yet
# (gpg will use 0600 otherwise and that will break release-upgrades later)
ETC_KEYRING="/etc/apt/trusted.gpg"
if [ ! -f $ETC_KEYRING ]; then
touch $ETC_KEYRING
chmod 0644 $ETC_KEYRING
fi
# during maverick we had keyrings created with mode 0600
# but this will break tools like update-managers release-downloader
# because it uses the trusted.gpg keyring to verify the signature (as user)
if dpkg --compare-versions "$2" lt-nl "2010.+09.30"; then
chmod 0644 $ETC_KEYRING
fi
# make sure apt knows about the new keys
if [ -x /usr/bin/apt-key ]; then
/usr/bin/apt-key update
fi
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