mirror of
https://github.com/openglow-org/forgefirm.git
synced 2026-09-28 01:01:12 -07:00
ScottW514
cea0439e17
The image's busybox has no blockdev applet, so the grow path silently skipped. Sector counts now come from /sys/class/block (no external tool); log lines also go to /dev/kmsg so migration results are visible in dmesg after boot.
89 lines
3.2 KiB
Bash
89 lines
3.2 KiB
Bash
#!/bin/sh
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# (C) Copyright 2020-2026
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# Scott Wiederhold, s.e.wiederhold@gmail.com
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# https://community.openglow.org
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# SPDX-License-Identifier: MIT
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#
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# Legacy-layout migration: reclaims the legacy ForgeFIRM partition (p4)
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# and grows /data (p3) to the end of the eMMC, restoring the factory
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# disk footprint. Runs in rcS before mountall, so /data is not yet
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# mounted. Every step is keyed off the actual disk state - an
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# interrupted run resumes on the next boot; a factory-layout disk is a
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# fast no-op. Only acts when booted from an eMMC rootfs slot: SD boots
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# (bench/dev) never touch the eMMC and p4 itself must not saw off its
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# own branch.
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DISK=/dev/mmcblk2
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P3=${DISK}p3
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log () {
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echo "slotmigrate: $*"
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echo "slotmigrate: $*" > /dev/kmsg 2>/dev/null
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}
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case "$1" in
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start|"") ;;
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*) exit 0 ;;
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esac
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# Runs at S02, possibly before the sysfs/proc mount scripts.
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mountpoint -q /proc 2>/dev/null || mount -t proc proc /proc 2>/dev/null
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mountpoint -q /sys 2>/dev/null || mount -t sysfs sysfs /sys 2>/dev/null
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[ -r /proc/cmdline ] || exit 0
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ROOT=$(sed -n 's/.*root=\([^ ]*\).*/\1/p' /proc/cmdline)
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case "$ROOT" in
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/dev/mmcblk2p1|/dev/mmcblk2p2) ;;
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*) exit 0 ;;
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esac
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command -v sfdisk >/dev/null || { log "sfdisk missing, skipping"; exit 0; }
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if grep -q "^${P3} " /proc/mounts; then
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log "/data already mounted, skipping this boot"
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exit 0
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fi
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# --- partition table -----------------------------------------------------
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if sfdisk -d "$DISK" 2>/dev/null | grep -q "^${DISK}p4"; then
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log "removing legacy partition p4"
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sfdisk --no-reread --force --delete "$DISK" 4 >/dev/null 2>&1 \
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|| { log "p4 delete FAILED"; exit 0; }
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partx -d --nr 4 "$DISK" 2>/dev/null
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fi
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DISK_SECT=$(cat /sys/class/block/mmcblk2/size 2>/dev/null)
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P3_START=$(sfdisk -d "$DISK" 2>/dev/null | sed -n "s|^${P3} : start=[ ]*\([0-9]*\),.*|\1|p")
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P3_SIZE=$(sfdisk -d "$DISK" 2>/dev/null | sed -n "s|^${P3} .*size=[ ]*\([0-9]*\),.*|\1|p")
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[ -n "$DISK_SECT" ] && [ -n "$P3_START" ] && [ -n "$P3_SIZE" ] \
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|| { log "cannot read disk/p3 geometry"; exit 0; }
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if [ $((P3_START + P3_SIZE)) -lt "$DISK_SECT" ]; then
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log "growing p3 to the end of the disk ($((P3_START + P3_SIZE)) -> $DISK_SECT sectors)"
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echo ", +" | sfdisk --no-reread --force -N 3 "$DISK" >/dev/null 2>&1 \
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|| { log "p3 grow FAILED"; exit 0; }
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partx -u --nr 3 "$DISK" 2>/dev/null
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fi
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# --- filesystem ----------------------------------------------------------
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PART_SECT=$(cat /sys/class/block/mmcblk2p3/size 2>/dev/null)
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[ -n "$PART_SECT" ] || { log "cannot read p3 size"; exit 0; }
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FS_BLOCKS=$(tune2fs -l "$P3" 2>/dev/null | sed -n 's/^Block count:[ ]*//p')
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FS_BSIZE=$(tune2fs -l "$P3" 2>/dev/null | sed -n 's/^Block size:[ ]*//p')
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[ -n "$FS_BLOCKS" ] && [ -n "$FS_BSIZE" ] || { log "cannot read p3 filesystem"; exit 0; }
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FS_SECT=$((FS_BLOCKS * (FS_BSIZE / 512)))
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if [ "$FS_SECT" -lt $((PART_SECT - 2048)) ]; then
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log "growing /data filesystem ($FS_SECT -> $PART_SECT sectors)"
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e2fsck -f -p "$P3" >/dev/null 2>&1
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RC=$?
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if [ "$RC" -ge 4 ]; then
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log "e2fsck found errors (rc=$RC), NOT resizing"
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exit 0
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fi
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resize2fs "$P3" >/dev/null 2>&1 \
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&& log "/data grown to full size" \
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|| log "resize2fs FAILED (will retry next boot)"
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fi
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exit 0
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