forked from obel1x/fedora-OEMDRV
unbrot
5d0c674bec
Shrinks a selected ext4/btrfs partition by 4 GiB, creates a new BTRFS partition labeled OEMDRV, mounts it to /opt/sys_config and clones the repository into it. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
340 lines
14 KiB
Bash
Executable File
340 lines
14 KiB
Bash
Executable File
#!/usr/bin/env bash
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# SPDX-FileCopyrightText: Daniel Pätzold
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# SPDX-License-Identifier: AGPL-3.0-or-later
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#
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# Bootstrap script: creates an OEMDRV partition by shrinking an existing
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# ext4 or btrfs partition by 4 GiB, formats the freed space as BTRFS with
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# label OEMDRV, mounts it to /opt/sys_config and clones the repository.
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#
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# Run as root on a target machine before any Kickstart installation.
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SHRINK_MIB=4096
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OEMDRV_LABEL="OEMDRV"
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MOUNT_POINT="/opt/sys_config"
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MOUNT_OPTS="compress=zstd:6"
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REPO_URL="https://gitea.dtext.online/obel1x/fedora-OEMDRV.git"
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MIN_FREE_MIB=$(( SHRINK_MIB + 512 )) # require 512 MiB headroom above the shrink size
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# ── Helpers ───────────────────────────────────────────────────────────────────
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die() { echo; echo "ERROR: $*" >&2; exit 1; }
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info() { echo; echo ">>> $*"; }
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hr() { printf '%.0s─' {1..100}; echo; }
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require_root() {
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[[ "$EUID" -eq 0 ]] || die "This script must be run as root."
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}
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check_tools() {
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local missing=()
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for tool in lsblk blkid parted partprobe mkfs.btrfs git e2fsck resize2fs tune2fs; do
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command -v "$tool" >/dev/null 2>&1 || missing+=("$tool")
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done
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[[ ${#missing[@]} -eq 0 ]] || die "Missing required tools: ${missing[*]}"
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}
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# ── Free-space helpers ────────────────────────────────────────────────────────
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# Free MiB for a mounted device via df
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mounted_free_mib() {
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df --output=avail -BM "$1" 2>/dev/null | awk 'NR==2{gsub("M",""); print $1+0}'
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}
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# Free MiB for an unmounted ext4 device via tune2fs (no mount needed)
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ext4_free_mib() {
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local dev="$1" fb bs
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fb=$(tune2fs -l "$dev" 2>/dev/null | awk '/^Free blocks:/{print $3}')
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bs=$(tune2fs -l "$dev" 2>/dev/null | awk '/^Block size:/{print $3}')
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[[ -n "$fb" && -n "$bs" ]] || { echo 0; return; }
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echo $(( fb * bs / 1048576 ))
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}
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# Free MiB for a btrfs device – mounts temporarily if not already mounted
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btrfs_free_mib() {
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local dev="$1" mnt free tmp=0
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mnt=$(lsblk -n -o MOUNTPOINT "$dev" 2>/dev/null | grep -v '^$' | head -1)
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if [[ -z "$mnt" ]]; then
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mnt=$(mktemp -d /tmp/oemdrv_check.XXXXXX)
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mount -o ro "$dev" "$mnt" 2>/dev/null && tmp=1 || { rmdir "$mnt"; echo 0; return; }
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fi
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free=$(mounted_free_mib "$mnt")
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[[ $tmp -eq 1 ]] && { umount "$mnt"; rmdir "$mnt"; }
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echo "${free:-0}"
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}
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# ── Partition discovery ───────────────────────────────────────────────────────
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# Parallel arrays, indexed 0..PT_IDX-1
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PT_IDX=0
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PT_DEV=() # /dev/sda2
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PT_DISK=() # /dev/sda
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PT_PNUM=() # 2
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PT_SIZE=() # "100G"
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PT_FS=() # ext4 | btrfs
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PT_LABEL=() # home | -
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PT_UUID=() # xxxxxxxx | -
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PT_MNT=() # /home | -
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PT_FREE=() # free MiB (integer)
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PT_OK=() # 1 = shrinkable
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collect_partitions() {
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local NAME SIZE FSTYPE LABEL UUID MOUNTPOINT TYPE PKNAME
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while IFS= read -r line; do
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NAME="" SIZE="" FSTYPE="" LABEL="" UUID="" MOUNTPOINT="" TYPE="" PKNAME=""
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eval "$line"
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[[ "$TYPE" != "part" ]] && continue
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[[ "$FSTYPE" != "ext4" && "$FSTYPE" != "btrfs" ]] && continue
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[[ "$LABEL" == "$OEMDRV_LABEL" ]] && continue
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[[ -z "$PKNAME" ]] && continue
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local disk="/dev/$PKNAME"
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local pnum
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pnum=$(cat /sys/class/block/"${NAME##/dev/}"/partition 2>/dev/null) || continue
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# Free space check
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local free_mib
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if [[ -n "$MOUNTPOINT" ]]; then
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free_mib=$(mounted_free_mib "$NAME")
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elif [[ "$FSTYPE" == "ext4" ]]; then
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free_mib=$(ext4_free_mib "$NAME")
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else
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free_mib=$(btrfs_free_mib "$NAME")
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fi
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free_mib=${free_mib:-0}
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# Shrinkable: not /, enough free space
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local ok=0
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[[ "$MOUNTPOINT" != "/" && "$free_mib" -ge "$MIN_FREE_MIB" ]] && ok=1
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PT_DEV[$PT_IDX]="$NAME"
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PT_DISK[$PT_IDX]="$disk"
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PT_PNUM[$PT_IDX]="$pnum"
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PT_SIZE[$PT_IDX]="$SIZE"
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PT_FS[$PT_IDX]="$FSTYPE"
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PT_LABEL[$PT_IDX]="${LABEL:--}"
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PT_UUID[$PT_IDX]="${UUID:--}"
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PT_MNT[$PT_IDX]="${MOUNTPOINT:--}"
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PT_FREE[$PT_IDX]="$free_mib"
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PT_OK[$PT_IDX]="$ok"
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(( PT_IDX++ )) || true
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done < <(lsblk -o NAME,SIZE,FSTYPE,LABEL,UUID,MOUNTPOINT,TYPE,PKNAME -p -P -n 2>/dev/null)
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}
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# ── Table display ─────────────────────────────────────────────────────────────
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show_table() {
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hr
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printf " %-4s %-14s %-6s %-8s %-10s %-6s %-18s %-36s %s\n" \
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"#" "Device" "Disk" "Size" "Free (MiB)" "FS" "Label" "UUID" "Mountpoint"
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hr
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local i mark note
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for (( i=0; i<PT_IDX; i++ )); do
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mark=" "
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note=""
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if [[ "${PT_OK[$i]}" == "1" ]]; then
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mark="* "
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elif [[ "${PT_MNT[$i]}" == "/" ]]; then
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note=" (root — skip)"
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else
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note=" (not enough free space)"
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fi
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printf "%s%-4s %-14s %-6s %-8s %-10s %-6s %-18s %-36s %s%s\n" \
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"$mark" \
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"$((i+1))" \
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"${PT_DEV[$i]}" \
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"${PT_DISK[$i]##/dev/}" \
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"${PT_SIZE[$i]}" \
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"${PT_FREE[$i]}" \
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"${PT_FS[$i]}" \
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"${PT_LABEL[$i]}" \
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"${PT_UUID[$i]}" \
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"${PT_MNT[$i]}" \
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"$note"
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done
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hr
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printf " * = shrinkable: will be reduced by %s MiB to create OEMDRV\n" "$SHRINK_MIB"
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echo
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}
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# ── Partition geometry via parted -m ─────────────────────────────────────────
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part_end_mib() {
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parted -s "$1" -m unit MiB print 2>/dev/null \
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| awk -F: -v p="$2" '$1==p{gsub("MiB","",$3); printf "%.0f\n",$3; exit}'
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}
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part_start_mib() {
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parted -s "$1" -m unit MiB print 2>/dev/null \
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| awk -F: -v p="$2" '$1==p{gsub("MiB","",$2); printf "%.0f\n",$2; exit}'
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}
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# Device name for a new partition on a given disk
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new_part_device() {
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local disk="$1" pnum="$2"
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if [[ "$disk" =~ (nvme|mmcblk) ]]; then
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echo "${disk}p${pnum}"
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else
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echo "${disk}${pnum}"
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fi
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}
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# ── Main ──────────────────────────────────────────────────────────────────────
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require_root
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check_tools
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info "Scanning partitions for shrinkable ext4 / btrfs volumes..."
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collect_partitions
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[[ $PT_IDX -gt 0 ]] || die "No ext4 or btrfs partitions found on this system."
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show_table
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# Count shrinkable
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shrink_count=0
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for (( i=0; i<PT_IDX; i++ )); do [[ "${PT_OK[$i]}" == "1" ]] && (( shrink_count++ )) || true; done
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[[ $shrink_count -gt 0 ]] || die "No shrinkable partitions found. A non-root ext4 or btrfs partition needs at least ${MIN_FREE_MIB} MiB free."
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# ── Selection ─────────────────────────────────────────────────────────────────
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SEL=-1
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while true; do
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read -r -p "Enter number of partition to shrink, or q to quit: " INPUT
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[[ "$INPUT" =~ ^[qQ]$ ]] && { echo "Aborted."; exit 0; }
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[[ "$INPUT" =~ ^[0-9]+$ ]] || { echo " Please enter a number."; continue; }
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local_i=$(( INPUT - 1 ))
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(( local_i >= 0 && local_i < PT_IDX )) || { echo " Number out of range."; continue; }
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[[ "${PT_OK[$local_i]}" == "1" ]] || { echo " That partition cannot be shrunk (see marks above)."; continue; }
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SEL=$local_i
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break
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done
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S_DEV="${PT_DEV[$SEL]}"
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S_DISK="${PT_DISK[$SEL]}"
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S_PNUM="${PT_PNUM[$SEL]}"
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S_FS="${PT_FS[$SEL]}"
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S_MNT="${PT_MNT[$SEL]}"
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echo
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echo " Partition : $S_DEV (${PT_FS[$SEL]}, ${PT_SIZE[$SEL]}, ${PT_FREE[$SEL]} MiB free)"
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echo " Disk : $S_DISK Partition number: $S_PNUM"
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echo " Mountpoint: $S_MNT"
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echo
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echo " $S_DEV will be shrunk by ${SHRINK_MIB} MiB."
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echo " A new ${SHRINK_MIB} MiB BTRFS partition labeled OEMDRV will be created."
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echo " It will be mounted at $MOUNT_POINT and the repository cloned into it."
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echo
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read -r -p " Type YES (uppercase) to confirm, anything else to abort: " CONFIRM
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[[ "$CONFIRM" == "YES" ]] || { echo "Aborted."; exit 0; }
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# ── Geometry ──────────────────────────────────────────────────────────────────
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info "Reading partition geometry on $S_DISK..."
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CURR_END=$(part_end_mib "$S_DISK" "$S_PNUM")
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CURR_START=$(part_start_mib "$S_DISK" "$S_PNUM")
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[[ -n "$CURR_END" && -n "$CURR_START" ]] || die "Could not read geometry for partition $S_PNUM on $S_DISK."
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NEW_END=$(( CURR_END - SHRINK_MIB ))
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NEW_FS_MIB=$(( NEW_END - CURR_START ))
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OEMDRV_START=$NEW_END
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OEMDRV_END=$CURR_END
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echo " Current partition : ${CURR_START} MiB – ${CURR_END} MiB"
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echo " After shrink : ${CURR_START} MiB – ${NEW_END} MiB (filesystem: ${NEW_FS_MIB} MiB)"
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echo " New OEMDRV : ${OEMDRV_START} MiB – ${OEMDRV_END} MiB (${SHRINK_MIB} MiB)"
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# ── Unmount ───────────────────────────────────────────────────────────────────
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WAS_MOUNTED=0
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ORIG_MNT=""
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if [[ "$S_MNT" != "-" && -n "$S_MNT" ]]; then
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info "Unmounting $S_DEV from $S_MNT..."
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ORIG_MNT="$S_MNT"
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umount "$S_DEV" || die "Cannot unmount $S_DEV. Close all open files and try again."
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WAS_MOUNTED=1
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fi
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# ── Filesystem resize ─────────────────────────────────────────────────────────
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if [[ "$S_FS" == "ext4" ]]; then
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info "Running e2fsck on $S_DEV..."
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e2fsck -f "$S_DEV" || die "e2fsck found errors on $S_DEV. Fix them before retrying."
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info "Shrinking ext4 filesystem to ${NEW_FS_MIB} MiB..."
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resize2fs "$S_DEV" "${NEW_FS_MIB}M" || die "resize2fs failed."
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elif [[ "$S_FS" == "btrfs" ]]; then
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info "Shrinking btrfs filesystem on $S_DEV to ${NEW_FS_MIB} MiB..."
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TMP_MNT=$(mktemp -d /tmp/oemdrv_btrfs.XXXXXX)
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mount "$S_DEV" "$TMP_MNT" || { rmdir "$TMP_MNT"; die "Cannot mount $S_DEV for btrfs resize."; }
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btrfs filesystem resize "${NEW_FS_MIB}m" "$TMP_MNT" \
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|| { umount "$TMP_MNT"; rmdir "$TMP_MNT"; die "btrfs filesystem resize failed."; }
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sync
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umount "$TMP_MNT" && rmdir "$TMP_MNT"
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fi
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# ── Partition table update ────────────────────────────────────────────────────
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info "Shrinking partition $S_PNUM to ${NEW_END} MiB in partition table..."
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parted -s "$S_DISK" resizepart "$S_PNUM" "${NEW_END}MiB" \
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|| die "parted resizepart failed."
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info "Creating new OEMDRV partition (${OEMDRV_START}–${OEMDRV_END} MiB)..."
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parted -s "$S_DISK" mkpart primary btrfs "${OEMDRV_START}MiB" "${OEMDRV_END}MiB" \
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|| die "parted mkpart failed. Check that the target area is free space on $S_DISK."
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partprobe "$S_DISK"
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sleep 1
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# Determine new partition number (highest on the disk after partprobe)
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NEW_PNUM=$(parted -s "$S_DISK" -m unit MiB print 2>/dev/null \
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| awk -F: '/^[0-9]/{n=$1} END{print n}')
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[[ -n "$NEW_PNUM" ]] || die "Could not determine new partition number on $S_DISK."
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OEMDRV_DEV=$(new_part_device "$S_DISK" "$NEW_PNUM")
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[[ -b "$OEMDRV_DEV" ]] || die "New partition device $OEMDRV_DEV not found after partprobe."
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info "New partition device: $OEMDRV_DEV"
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# ── Format ────────────────────────────────────────────────────────────────────
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info "Formatting $OEMDRV_DEV as BTRFS (label: $OEMDRV_LABEL)..."
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mkfs.btrfs -f -L "$OEMDRV_LABEL" "$OEMDRV_DEV" || die "mkfs.btrfs failed."
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# ── Remount original partition ────────────────────────────────────────────────
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if [[ $WAS_MOUNTED -eq 1 && -n "$ORIG_MNT" ]]; then
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info "Remounting $S_DEV to $ORIG_MNT..."
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mount "$S_DEV" "$ORIG_MNT" \
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|| echo "WARNING: Could not remount $S_DEV to $ORIG_MNT — remount manually."
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fi
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# ── Mount OEMDRV ──────────────────────────────────────────────────────────────
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info "Mounting $OEMDRV_DEV to $MOUNT_POINT (options: $MOUNT_OPTS)..."
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[[ -d "$MOUNT_POINT" ]] || mkdir -p "$MOUNT_POINT"
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mount -o "$MOUNT_OPTS" "$OEMDRV_DEV" "$MOUNT_POINT" || die "mount failed."
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# ── Clone repository ──────────────────────────────────────────────────────────
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info "Cloning $REPO_URL into $MOUNT_POINT..."
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cd "$MOUNT_POINT" || die "Cannot cd to $MOUNT_POINT."
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git clone --progress --depth 1 "$REPO_URL" . || die "git clone failed."
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# ── Done ──────────────────────────────────────────────────────────────────────
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info "Done."
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echo
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echo " OEMDRV device : $OEMDRV_DEV"
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echo " Mounted at : $MOUNT_POINT"
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echo
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echo "Next steps:"
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echo " 1. cp $MOUNT_POINT/config/setup_system.conf.dist \\"
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echo " $MOUNT_POINT/config/setup_system.conf"
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echo " 2. Edit setup_system.conf with your domain, IPA/Nextcloud FQDNs, and paths."
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echo " 3. Boot the Kickstart installer — it will detect the OEMDRV partition automatically."
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echo
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