mirror of
https://github.com/BetterCorp/BetterFrame.git
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55 lines
1.7 KiB
Bash
55 lines
1.7 KiB
Bash
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#!/bin/bash
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# Expand BF_DATA (last partition) to fill the SD card on first boot.
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# BF_DATA is mounted at /var/lib/betterframe. On a fresh image it's ~512MB;
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# after expansion it fills whatever SD card size the operator used.
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#
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# Safe to re-run: growpart is idempotent (exits 0 "NOCHANGE" if already grown),
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# and the marker file prevents systemd from re-invoking after success.
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set -euo pipefail
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MARKER="/var/lib/betterframe/.data-expanded"
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MOUNTPOINT="/var/lib/betterframe"
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if [ -f "$MARKER" ]; then
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echo "BF_DATA already expanded, skipping."
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exit 0
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fi
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# Find the block device backing BF_DATA from the mount table.
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DATA_DEV="$(findmnt -n -o SOURCE "$MOUNTPOINT" 2>/dev/null || true)"
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if [ -z "$DATA_DEV" ]; then
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echo "WARNING: $MOUNTPOINT not mounted, cannot expand. Skipping."
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exit 0
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fi
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# Extract disk + partition number (e.g. /dev/mmcblk0p5 → /dev/mmcblk0 + 5).
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if [[ "$DATA_DEV" =~ ^(/dev/mmcblk[0-9]+)p([0-9]+)$ ]]; then
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DISK="${BASH_REMATCH[1]}"
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PARTNUM="${BASH_REMATCH[2]}"
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elif [[ "$DATA_DEV" =~ ^(/dev/sd[a-z]+)([0-9]+)$ ]]; then
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DISK="${BASH_REMATCH[1]}"
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PARTNUM="${BASH_REMATCH[2]}"
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else
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echo "WARNING: cannot parse device $DATA_DEV, skipping expansion."
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exit 0
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fi
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echo "Expanding partition ${DISK}p${PARTNUM} (BF_DATA) to fill disk..."
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# growpart expands the partition to use all trailing free space.
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# Exit code 0 = grown, 1 = error, NOCHANGE printed if already at max.
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if ! growpart "$DISK" "$PARTNUM"; then
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echo "growpart returned non-zero (may already be at max size)."
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fi
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# Inform the kernel of the new partition size.
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partprobe "$DISK" 2>/dev/null || true
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# Resize the ext4 filesystem to fill the expanded partition.
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resize2fs "$DATA_DEV"
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# Drop marker so this doesn't run again.
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touch "$MARKER"
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echo "BF_DATA expanded successfully."
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