21 lines
1.4 KiB
Bash
21 lines
1.4 KiB
Bash
#!/bin/sh
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# B12 (board, LFS host side): RAM-only Alpine chroot at /tmp/alpine on its own tmpfs (size-capped; umount frees everything).
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# chroot-up.sh <alpine-b13.tar.gz | -> (- = stream from stdin)
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# Mounts (only what X/apk need): proc, sysfs (ro), /dev (bind), /dev/pts (bind). No eMMC partition is touched.
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set -u; R=/tmp/alpine; SZ=${ALPINE_TMPFS_SIZE:-160m}; SRC=${1:-}
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log() { echo "[$(cut -d' ' -f1 /proc/uptime)] $*"; }
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mnt() { grep -q " $1 " /proc/mounts; }
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[ -n "$SRC" ] || { echo "usage: $0 <tar.gz|->"; exit 2; }
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mkdir -p $R
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mnt $R || mount -t tmpfs -o size=$SZ,mode=0755 alpine $R || { echo "CHROOT-UP FAIL tmpfs"; exit 1; }
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if [ ! -x $R/bin/busybox ]; then
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if [ "$SRC" = - ]; then tar xzf - -C $R; else tar xzf "$SRC" -C $R; fi || { echo "CHROOT-UP FAIL extract"; exit 1; }
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fi
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mnt $R/proc || mount -t proc proc $R/proc
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mnt $R/sys || { mount -o bind /sys $R/sys && mount -o remount,bind,ro $R/sys; }
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mnt $R/dev || mount -o bind /dev $R/dev
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mnt $R/dev/pts || mount -o bind /dev/pts $R/dev/pts
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# DNS for apk inside the chroot: bearer DNS from the modem controller (falls back to 77.88.8.8)
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DNS=$(sed -n 's/^DNS=//p' /run/aurora-modem/ipcfg 2>/dev/null | tr ',' ' '); [ -n "$DNS" ] || DNS=77.88.8.8
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: > $R/etc/resolv.conf; for d in $DNS; do echo "nameserver $d" >> $R/etc/resolv.conf; done
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log "CHROOT-UP OK $(cat $R/etc/alpine-release) used=$(df -k $R | awk 'NR==2{print $3}')k mounts=$(grep -c " $R" /proc/mounts)"
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