52 lines
1.4 KiB
Bash
Executable File
52 lines
1.4 KiB
Bash
Executable File
#!/bin/bash
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# Create a minimal initramfs for the stock H700 kernel.
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# The stock kernel has most drivers built-in, so we just need
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# a minimal init that mounts rootfs and exec's /sbin/init.
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set -e
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outdir="${1:-./artifacts}"
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tmp="$(mktemp -d)"
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trap 'rm -rf "$tmp"' 0
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mkdir -p "$tmp"/{bin,dev,proc,sys,newroot}
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# Use busybox from host or build a static one
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# For now, create a minimal shell init script
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cat > "$tmp/init" << 'INITEOF'
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#!/bin/busybox sh
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/bin/busybox mount -t proc none /proc
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/bin/busybox mount -t sysfs none /sys
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/bin/busybox mount -t devtmpfs none /dev
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# Find the root partition (partition 5 = rootfs)
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root=""
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for dev in /dev/mmcblk0p5 /dev/mmcblk0p4; do
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if [ -b "$dev" ]; then
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root="$dev"
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break
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fi
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done
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if [ -z "$root" ]; then
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echo "Cannot find root partition!"
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/bin/busybox sh
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fi
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/bin/busybox mount -t ext4 "$root" /newroot
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exec /bin/busybox switch_root /newroot /sbin/init
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INITEOF
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chmod +x "$tmp/init"
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# Get a static busybox for aarch64
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if [ ! -f "$outdir/busybox" ]; then
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podman run --arch=aarch64 --security-opt=label=disable \
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-v "$(realpath "$outdir"):/out" \
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--rm "docker.io/library/alpine:latest" \
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sh -c "apk add busybox-static && cp /bin/busybox.static /out/busybox"
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fi
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cp "$outdir/busybox" "$tmp/bin/busybox"
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chmod +x "$tmp/bin/busybox"
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# Create initramfs
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(cd "$tmp" && find . | cpio -o -H newc 2>/dev/null | gzip > "$outdir/initramfs")
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