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#!/bin/sh
# Library of shell functions to help write live-config components
pkg_is_installed() {
local package="$1"
if [ -z "$package" ]; then
echo "ERROR: pkg_is_installed() needs a package as parameter" >&2
exit 1
fi
if dpkg-query -f'${db:Status-Status}\n' -W $package 2>/dev/null | grep -q ^installed; then
return 0
fi
return 1
}
pkg_test_version() {
local package="$1"
local relation="$2"
local version="$3"
if [ -z "$package" ] || [ -z "$relation" ] || [ -z "$version" ]; then
echo "ERROR: pkg_test_version() takes three arguments: <package>, <relation>, <version>" >&2
exit 1
fi
local instver=$(dpkg-query -f'${Version}\n' -W $package 2>/dev/null)
if [ -z "$instver" ]; then
echo "ERROR: can't test version of package $package if it's not installed"
exit 1
fi
if dpkg --compare-versions "$instver" "$relation" "$version" ; then
return 0
fi
return 1
}
component_was_executed() {
local component="$1"
if [ -z "$component" ]; then
echo "ERROR: component_was_executed() needs a component as parameter" >&2
exit 1
fi
if test -e /var/lib/live/config/$component; then
return 0
fi
return 1
}
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