postinst: migrate/update APT auth config

missed when switching over to Proxmox::RS::Subscription, which stores
the same info in the product-specific /etc/apt/auth.conf.d/pve.conf .

the top-level file might contain non-PVE-managed entries, so only remove
entries matching "our" machine.

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

debian/postinst

@@ -62,6 +62,36 @@ EOF
     fi
 }
 
+migrate_apt_auth_conf() {
+    output=""
+    removed=""
+    match=0
+
+    while read -r l; do
+	if echo "$l" | grep -q "^machine enterprise.proxmox.com/debian/pve"; then
+	    match=1
+	elif echo "$l" | grep -q "machine"; then
+	    match=0
+	fi
+
+	if test "$match" = "1"; then
+	    removed="$removed\n$l"
+	else
+	    output="$output\n$l"
+	fi
+    done < /etc/apt/auth.conf
+
+    if test -n "$removed"; then
+	if test ! -e /etc/apt/auth.conf.d/pve.conf; then
+	    echo "Migrating APT auth config for enterprise.proxmox.com to /etc/apt/auth.conf.d/pve.conf .."
+	    echo "$removed" > /etc/apt/auth.conf.d/pve.conf
+	else
+	    echo "Removing stale APT auth config from /etc/apt/auth.conf"
+	fi
+	echo "$output" > /etc/apt/auth.conf
+    fi
+}
+
 case "$1" in
   triggered)
     # We don't print a status message here, as dpkg already said
@@ -190,6 +220,12 @@ case "$1" in
 	    fi
 	done
     fi
+
+    if test ! -e /proxmox_install_mode && test -n "$2" && dpkg --compare-versions "$2" 'lt' '7.2.11~'; then
+	if test -e /etc/apt/auth.conf ; then
+	    migrate_apt_auth_conf
+	fi
+    fi
     ;;
 
   abort-upgrade|abort-remove|abort-deconfigure)