/usr/share/ltsp/plugins/ltsp-build-client/Debian/010-apt-pinning is in ltsp-server 5.4.2-6+deb7u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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commandline)
add_option "pin-dist" "`eval_gettext "distribution to set up apt pinning"`" "advanced" "true"
add_option "pin-packages" "`eval_gettext "list of packages to install from the pinned distribution"`" "advanced" "true"
;;
configure)
if [ -n "$option_pin_dist_value" ]; then
PIN_DIST="$option_pin_dist_value"
fi
if [ -n "$option_pin_packages_value" ]; then
if [ -z "$PIN_DIST" ]; then
echo require --pin-dist when using --pin-packages
exit 1
fi
PIN_PACKAGES="$option_pin_packages_value"
fi
;;
after-install)
if [ -n "$PIN_DIST" ]; then
cat << EOF > $ROOT/etc/apt/preferences
Package: *
Pin: release a=$PIN_DIST
Pin-Priority: 101
EOF
if [ -n "$PIN_PACKAGES" ]; then
for p in $PIN_PACKAGES ; do
EARLY_PACKAGES="$EARLY_PACKAGES $p/$PIN_DIST"
done
fi
fi
;;
esac
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