initial commit

scripts/apt-install.sh

@@ -0,0 +1,45 @@
+#!/bin/sh
+set -ef
+
+find_fresh_ts() {
+	{
+		find "$@" -exec stat -c '%Y' '{}' '+' 2>/dev/null || :
+		# duck and cover!
+		echo 1
+	} | sort -rn | head -n 1
+}
+
+_apt_update() {
+	# update package lists; may fail sometimes,
+	# e.g. soon-to-release channels like Debian "bullseye" @ 22.04.2021
+
+	# (wannabe) smart package list update
+	ts_sources=$(find_fresh_ts /etc/apt/ -follow -regextype egrep -regex '.+\.(list|sources)$' -type f)
+	ts_lists=$(find_fresh_ts /var/lib/apt/lists/ -maxdepth 1 -regextype egrep -regex '.+_Packages(\.(bz2|gz|lz[4o]|xz|zstd?))?$' -type f)
+	if [ ${ts_sources} -gt ${ts_lists} ] ; then
+		apt-env.sh apt-get update
+	fi
+}
+
+_dpkg_avail_hack() {
+	: "${DPKG_ADMINDIR:=/var/lib/dpkg}"
+	VERSION_CODENAME=$(. /etc/os-release ; printf '%s' "${VERSION_CODENAME}") || :
+	f="${DPKG_ADMINDIR}/available"
+	# if ${VERSION_CODENAME} is empty then we're on Debian sid or so :)
+	case "${VERSION_CODENAME}" in
+	stretch | buster | bionic | focal )
+		# ref: https://unix.stackexchange.com/a/271387/49297
+		if [ -s "$f" ] ; then
+			return
+		fi
+		/usr/lib/dpkg/methods/apt/update "${DPKG_ADMINDIR}" apt apt
+	;;
+	* )
+		touch "$f"
+	;;
+	esac
+}
+
+_apt_update
+_dpkg_avail_hack
+exec apt-env.sh apt-get install -y --no-install-recommends --no-install-suggests "$@"