107 lines
3.7 KiB
Bash
107 lines
3.7 KiB
Bash
# shellcheck shell=bash
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# Shared helpers for the qemu/ device-sim build scripts. Sourced, not executed.
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# Callers must run under `set -euo pipefail` and define QEMU_DIR (the qemu/ dir).
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BB_VER=1.31.0
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BB_URL="https://busybox.net/downloads/binaries/${BB_VER}-defconfig-multiarch-musl/busybox-armv7l"
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qemu_log() { printf '\033[36m== %s\033[0m\n' "$*"; }
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# Fetch (or accept via $BUSYBOX) the pinned static armv7 busybox and verify it
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# against qemu/busybox.sha256. FAILS CLOSED: a missing pin refuses to build,
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# never silently skips verification, mirroring build/build-kernel.sh's
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# tarball handling. Sets $BB to the verified binary's path.
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qemu_get_busybox() {
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local sha_file="$QEMU_DIR/busybox.sha256"
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local out="${OUT:-$QEMU_DIR/out}"
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mkdir -p "$out"
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BB="${BUSYBOX:-$out/busybox-armv7l}"
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# Pin first: a missing pin refuses BEFORE downloading, same ordering as
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# build/fetch-kernel-tarball.sh.
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[ -f "$sha_file" ] || {
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echo "FATAL: no pinned sha256 for busybox (expected $sha_file): refusing to build from an unverified binary" >&2
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exit 1
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}
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local want got
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want="$(cat "$sha_file")"
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if [ -f "$BB" ]; then
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got="$(sha256sum "$BB" | awk '{print $1}')"
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if [ "$want" = "$got" ]; then
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qemu_log "busybox sha256 verified"
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return
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fi
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qemu_log "cached busybox failed verification; fetching a clean copy"
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fi
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local attempt tmp="${BB}.download.$$"
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rm -f "$tmp"
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for attempt in 1 2 3; do
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qemu_log "downloading $BB_URL (attempt $attempt/3)"
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if curl --retry 3 --retry-delay 5 --retry-connrefused -fSL "$BB_URL" -o "$tmp"; then
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got="$(sha256sum "$tmp" | awk '{print $1}')"
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if [ "$want" = "$got" ]; then
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mv -f "$tmp" "$BB"
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qemu_log "busybox sha256 verified"
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return
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fi
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echo "busybox sha256 mismatch on attempt $attempt: want $want got $got" >&2
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fi
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rm -f "$tmp"
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done
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echo "FATAL: could not fetch pinned busybox after 3 verified attempts" >&2
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exit 1
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}
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# Stage the shared rootfs skeleton (qemu/rootfs/ + busybox) into $1.
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# Requires qemu_get_busybox to have run (uses $BB).
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qemu_stage_rootfs() {
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local root="$1"
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mkdir -p "$root/bin" "$root/sbin" "$root/dev" "$root/proc" "$root/sys" \
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"$root/etc" "$root/tmp" "$root/mnt" "$root/userdata" "$root/oem" \
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"$root/usr/bin" "$root/usr/share/udhcpc"
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install -m 0755 "$BB" "$root/bin/busybox"
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cp -a "$QEMU_DIR/rootfs/." "$root/"
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chmod 0755 "$root/init" "$root/sbin/init" "$root/etc/rc" \
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"$root/usr/share/udhcpc/default.script"
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# git only tracks the executable bit, so a checkout lands etc/shadow at
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# whatever the umask gives a non-executable file (644 under the common
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# 022) -- root's crypt hash world-readable. Force the normal shadow mode
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# here, once, for every caller (mkimage.sh and mkinitramfs.sh both stage
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# through this function).
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chmod 0600 "$root/etc/shadow"
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}
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# Parse a "SIZE[@OFFSET](NAME)" blkdevparts entry list (without the "vda:"
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# prefix) and invoke a callback `$1 name offset_bytes size_bytes` per entry.
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qemu_each_partition() {
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local cb="$1" parts entry size_s off_s name size off
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parts="${WARDEN_BLKDEVPARTS#*:}"
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off=0
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local IFS=','
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for entry in $parts; do
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name="${entry##*(}"; name="${name%)}"
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size_s="${entry%%(*}"
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if [ "${size_s#*@}" != "$size_s" ]; then
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off_s="${size_s#*@}"; size_s="${size_s%@*}"
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off="$(qemu_to_bytes "$off_s")"
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fi
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size="$(qemu_to_bytes "$size_s")"
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"$cb" "$name" "$off" "$size"
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off=$((off + size))
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done
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}
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qemu_to_bytes() {
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local v="$1" n mult=1
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case "$v" in
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*K) n="${v%K}"; mult=1024 ;;
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*M) n="${v%M}"; mult=1048576 ;;
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*G) n="${v%G}"; mult=1073741824 ;;
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*) n="$v" ;;
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esac
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case "$n" in
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''|*[!0-9]*) echo "FATAL: bad blkdevparts size/offset token: '$v'" >&2; exit 1 ;;
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esac
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echo $((n * mult))
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}
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