/etc/piuparts/scripts/post_setup_experimental is in piuparts 0.64ubuntu1.
This file is owned by root:root, with mode 0o755.
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 | #!/bin/sh
set -e
test "$PIUPARTS_DISTRIBUTION" = "experimental" || exit 0
# apt-get -t experimental dist-upgrade may pull in too many
# packages that are not co-installable in experimental
# so maintain a list of packages in the sid base system
# that are in experimental, too, and don't cause problems
PKGS=""
PKGS="$PKGS apt"
PKGS="$PKGS libc6"
PKGS="$PKGS libc-bin"
PKGS="$PKGS libgcc1"
PKGS="$PKGS libstdc++6"
PKGS="$PKGS multiarch-support"
PKGS="$PKGS findutils"
PKGS="$PKGS insserv"
PKGS="$PKGS dash"
PKGS="$PKGS libdbus-1-3"
PKGS="$PKGS grep"
PKGS="$PKGS libsystemd0"
PKGS="$PKGS libudev1"
apt-get -y -t experimental install $PKGS
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