Moved automatic ZFS snapshot triggered by apt into seperate script. Moved 'logrotate' and 'initramfs' functions into 'debian.sh'

apt-snapshot.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+set -euo pipefail
+
+
+cat << EOF | tee /usr/bin/zfs-system-snapshot-apt &> /dev/null
+#!/bin/bash
+set -euo pipefail
+
+
+TIMESTAMP="\$(date +%Y_%m_%d-%H_%M_%S)"
+
+
+if [[ -z "\$(zfs list -t snapshot | grep 'apt-\${TIMESTAMP}')" ]]; then
+    zfs snapshot \$(zfs mount | grep 'ROOT' | sed 's| .*||')@apt-\${TIMESTAMP} && printf "\n- Snapshot taken\n\n"
+fi
+EOF
+
+chmod \
+	+x \
+	/usr/bin/zfs-system-snapshot-apt
+
+printf \
+	'DPkg::Pre-Install-Pkgs {"/usr/bin/zfs-system-snapshot-apt";};\n' | \
+	tee /etc/apt/apt.conf.d/90-zfs_system-snapshot &> /dev/null
+
+printf \
+	'DPkg::Post-Invoke {"apt moo";};\n' | \
+	tee /etc/apt/apt.conf.d/99-apt_moo &> /dev/null