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Filename : apt.postgresql.org.sh
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#!/bin/sh

# script to add apt.postgresql.org to sources.list

# Copyright (C) 2013-2019 Christoph Berg <myon@debian.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# The full text of the GPL is distributed as in
# /usr/share/common-licenses/GPL-2 on Debian systems.

SOURCESLIST="/etc/apt/sources.list.d/pgdg.list"
DEB_SRC="#deb-src"
COMPONENTS="main"
PGDG="pgdg"

while getopts "c:f:ipstv:y" opt ; do
    case $opt in
        c) COMPONENTS="main $OPTARG" ;; # make these extra components available
        f) SOURCESLIST=$OPTARG ;; # sources.list filename to write to
        i) INSTALL="yes" ;; # install packages for version given with -v
        p) PURGE="yes" ;; # purge existing postgresql packages
        s) DEB_SRC="deb-src" ;; # include source repository as well
        t) PGDG="pgdg-testing" ;; # use *-pgdg or *-pgdg-testing
        v) VERSION="$OPTARG" ;; # set up sources.list to use this version (useful for beta/devel packages)
        y) ;; # don't ask for confirmation
        *) exit 5 ;;
    esac
    YES="yes" # don't ask for confirmation if any option is given
done
# shift away args
shift $((OPTIND - 1))
# check options
if [ "$INSTALL" ] && [ -z "$VERSION" ]; then
    echo "With -i, a version to install must be provided (-v)"
    exit 1
fi

# codename from command line
CODENAME="$1"
# lsb_release is the best interface, but not always available
if [ -z "$CODENAME" ]; then
    CODENAME=$(lsb_release -cs 2>/dev/null)
fi
# parse os-release
if [ -z "$CODENAME" -a -f /etc/os-release ]; then
    . /etc/os-release
    if [ "$VERSION_CODENAME" ]; then # added in buster/xenial
        CODENAME="$VERSION_CODENAME"
    else
        # Debian: VERSION="7.0 (wheezy)"
        # Ubuntu: VERSION="13.04, Raring Ringtail"
        #         VERSION="18.04.1 LTS (Bionic Beaver)"
        CODENAME=$(echo $VERSION | sed -ne 's/.*(\(.*\)).*/\1/') # works on Debian only
    fi
fi
# guess from sources.list
if [ -z "$CODENAME" ]; then
    CODENAME=$(grep '^deb ' /etc/apt/sources.list | head -n1 | awk '{ print $3 }')
fi
# complain if no result yet
if [ -z "$CODENAME" ]; then
    cat <<EOF
Could not determine the distribution codename. Please report this as a bug to
pgsql-pkg-debian@postgresql.org. As a workaround, you can call this script with
the proper codename as parameter, e.g. "$0 squeeze".
EOF
    exit 1
fi

# errors are non-fatal above
set -e

# handle -v VERSION
case $VERSION in # FIXME: this shouldn't be hard-coded in here
    # devel version comes from *-pgdg-testing (with lower default apt pinning priority)
    13) PGDG="pgdg-testing"
        COMPONENTS="main $VERSION"
        PIN="-t $CODENAME-$PGDG" ;;
    # beta version just needs a different component
    12) COMPONENTS="main $VERSION" ;;
esac

cat <<EOF
This script will enable the PostgreSQL APT repository on apt.postgresql.org on
your system. The distribution codename used will be $CODENAME-$PGDG.

EOF

case $CODENAME in
    # known distributions
    sid|bullseye|buster|stretch|jessie|wheezy|squeeze|lenny|etch) ;;
    focal|eoan|disco|cosmic|bionic|zesty|xenial|wily|trusty|precise|lucid) ;;
    *) # unknown distribution, verify on the web
	DISTURL="http://apt.postgresql.org/pub/repos/apt/dists/"
	if [ -x /usr/bin/curl ]; then
	    DISTHTML=$(curl -s $DISTURL)
	elif [ -x /usr/bin/wget ]; then
	    DISTHTML=$(wget --quiet -O - $DISTURL)
	fi
	if [ "$DISTHTML" ]; then
	    if ! echo "$DISTHTML" | grep -q "$CODENAME-$PGDG"; then
		cat <<EOF
Your system is using the distribution codename $CODENAME, but $CODENAME-$PGDG
does not seem to be a valid distribution on
$DISTURL

We abort the installation here. If you want to use a distribution different
from your system, you can call this script with an explicit codename, e.g.
"$0 precise".

Specifically, if you are using a non-LTS Ubuntu release, refer to
https://wiki.postgresql.org/wiki/Apt/FAQ#I_am_using_a_non-LTS_release_of_Ubuntu

For more information, refer to https://wiki.postgresql.org/wiki/Apt
or ask on the mailing list for assistance: pgsql-pkg-debian@postgresql.org
EOF
		exit 1
	    fi
	fi
	;;
esac

if [ -z "$YES" ]; then
    echo -n "Press Enter to continue, or Ctrl-C to abort."
    read enter
fi

echo "Writing $SOURCESLIST ..."
cat > $SOURCESLIST <<EOF
deb http://apt.postgresql.org/pub/repos/apt/ $CODENAME-$PGDG $COMPONENTS
$DEB_SRC http://apt.postgresql.org/pub/repos/apt/ $CODENAME-$PGDG $COMPONENTS
EOF

echo "Importing repository signing key ..."
KEYRING="/etc/apt/trusted.gpg.d/apt.postgresql.org.gpg"
test -e $KEYRING || touch $KEYRING
apt-key --keyring $KEYRING add - <<EOF
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=DA1T
-----END PGP PUBLIC KEY BLOCK-----
EOF

echo "Running apt-get update ..."
apt-get update

cat <<EOF

You can now start installing packages from apt.postgresql.org.

Have a look at https://wiki.postgresql.org/wiki/Apt for more information;
most notably the FAQ at https://wiki.postgresql.org/wiki/Apt/FAQ
EOF

# remove/install packages
export DEBIAN_FRONTEND=noninteractive
if [ "$PURGE" ]; then
    echo "Purging existing PostgreSQL packages ..."
    apt-get -y purge postgresql-client-common
fi
if [ "$INSTALL" ]; then
    echo "Installing packages for PostgreSQL $VERSION ..."
    apt-get -y -o DPkg::Options::=--force-confnew install $PIN postgresql-$VERSION postgresql-server-dev-$VERSION
fi