46 lines
1.3 KiB
Bash
46 lines
1.3 KiB
Bash
#!/usr/bin/env bash
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ROOT_DATASET=$(zfs list -H -o name,mountpoint | awk '$2 == "/" { print $1 }')
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if [ -z "$ROOT_DATASET" ]; then
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echo "Error: Could not detect ZFS dataset mounted at /" >&2
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exit 1
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fi
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# Usually the pool name is the first component (rpool/ROOT/ubuntu → rpool)
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POOL_NAME="${ROOT_DATASET%%/*}"
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# Create zfs snapshots before apt operations using apt hooks
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# 1. Create a Snapshot Script
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# Create /usr/local/sbin/snapPrepApt
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conf_print_snapPrepApt() {
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cat <<EOF
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#!/bin/bash
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DATE="\$(date +%F-%T)"
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zfs snapshot -r ${POOL_NAME}@snap_pre_apt_\$DATE
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EOF
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}
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conf_print_snapPrepApt | sudo tee /usr/local/sbin/snapPrepApt
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sudo chmod +x /usr/local/sbin/snapPrepApt
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# 2. Add Apt Hook
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# Create /etc/apt/apt.conf.d/90zfs-pre-apt-snapshot
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conf_print_apt_conf_d() {
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cat <<EOF
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DPkg::Pre-Invoke {"/usr/local/sbin/snapPrepApt || true";};
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EOF
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}
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conf_print_apt_conf_d | sudo tee /etc/apt/apt.conf.d/90zfs-pre-apt-snapshot
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# 3. Kernel Updates
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# Use /etc/kernel/preinst.d/ to snapshot before kernel installation:
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conf_print_kernel_preinst_d() {
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cat <<EOF
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#!/bin/bash
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DATE="\$(date +%F-%T)"
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zfs snapshot -r \${POOL_NAME}@pre-kernel_\${DATE}
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EOF
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}
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conf_print_kernel_preinst_d | sudo tee /etc/kernel/preinst.d/90zfs-pre-kernel-snapshot
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sudo chmod +x /etc/kernel/preinst.d/90zfs-pre-kernel-snapshot
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