mirror of
https://github.com/MCKero6423/uv-k5-v3-emulator.git
synced 2026-10-02 03:15:36 +00:00
mckero
1364d46e97
assets/flash.img was gitignored, so the only copy of the never-booted image lived on one disk. The emulator writes to that image, so a session can leave edited settings or a damaged EEPROM behind with nothing to restore from. assets/pristine/ now holds the image as first generated, gzipped and checksummed, and is tracked deliberately. Gzip takes it from 2 MiB to 2.3 KiB because the image is nearly all 0xFF, which is what makes keeping it in git reasonable. The live image and its .bak-* files stay ignored. Two checksums are recorded, for the archive and for its contents, so a corrupted archive is distinguishable from one that was replaced. tools/restore_flash.sh verifies, diffs, or restores. Restore backs up the current image first, then re-checks the result, since a restore that silently half-worked would be worse than none. Verified by deliberately corrupting the live image: --diff reported 32 differing bytes, restore backed up and rewrote it, and --diff then reported no change. The image is currently byte-identical to what make_flash.py produces, so this is the genuine original rather than a copy of something already used.
81 lines
2.8 KiB
Bash
Executable File
81 lines
2.8 KiB
Bash
Executable File
#!/usr/bin/env bash
|
|
# Restore assets/flash.img to its pristine, never-booted state.
|
|
#
|
|
# The emulator writes to the flash image, so a session can leave settings, edited
|
|
# frequencies, or a corrupted EEPROM behind. assets/pristine/ holds a checksummed
|
|
# copy of the image as first generated, so there is always a known-good state to
|
|
# come back to.
|
|
#
|
|
# Usage:
|
|
# tools/restore_flash.sh # restore, backing up the current image
|
|
# tools/restore_flash.sh --verify # only check the pristine copy is intact
|
|
# tools/restore_flash.sh --diff # show whether the live image has changed
|
|
set -euo pipefail
|
|
|
|
SIM="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
|
|
LIVE="$SIM/assets/flash.img"
|
|
PRISTINE_GZ="$SIM/assets/pristine/flash-pristine.img.gz"
|
|
SUMS="$SIM/assets/pristine/flash-pristine.img.sha256"
|
|
|
|
want_plain() { awk '$2 == "flash-pristine.img" {print $1}' "$SUMS"; }
|
|
want_gz() { awk '$2 == "flash-pristine.img.gz" {print $1}' "$SUMS"; }
|
|
|
|
verify_pristine() {
|
|
[ -f "$PRISTINE_GZ" ] || { echo "missing $PRISTINE_GZ" >&2; exit 1; }
|
|
local got_gz got_plain
|
|
got_gz=$(sha256sum "$PRISTINE_GZ" | awk '{print $1}')
|
|
if [ "$got_gz" != "$(want_gz)" ]; then
|
|
echo "pristine archive is CORRUPT" >&2
|
|
echo " expected $(want_gz)" >&2
|
|
echo " actual $got_gz" >&2
|
|
exit 1
|
|
fi
|
|
got_plain=$(gzip -dc "$PRISTINE_GZ" | sha256sum | awk '{print $1}')
|
|
if [ "$got_plain" != "$(want_plain)" ]; then
|
|
echo "pristine contents do not match their checksum" >&2
|
|
exit 1
|
|
fi
|
|
echo "pristine copy verified ($(want_plain))"
|
|
}
|
|
|
|
case "${1:-restore}" in
|
|
--verify)
|
|
verify_pristine
|
|
;;
|
|
--diff)
|
|
verify_pristine
|
|
if [ ! -f "$LIVE" ]; then
|
|
echo "no live image at $LIVE"
|
|
exit 0
|
|
fi
|
|
live=$(sha256sum "$LIVE" | awk '{print $1}')
|
|
if [ "$live" = "$(want_plain)" ]; then
|
|
echo "live image is unchanged from pristine"
|
|
else
|
|
echo "live image HAS CHANGED from pristine"
|
|
echo " pristine $(want_plain)"
|
|
echo " live $live"
|
|
gzip -dc "$PRISTINE_GZ" > /tmp/.pristine.$$
|
|
echo " differing bytes: $(cmp -l /tmp/.pristine.$$ "$LIVE" 2>/dev/null | wc -l)"
|
|
rm -f /tmp/.pristine.$$
|
|
fi
|
|
;;
|
|
restore)
|
|
verify_pristine
|
|
if [ -f "$LIVE" ]; then
|
|
backup="$LIVE.bak-$(date +%Y%m%d-%H%M%S)"
|
|
cp -a "$LIVE" "$backup"
|
|
echo "current image saved to $(basename "$backup")"
|
|
fi
|
|
gzip -dc "$PRISTINE_GZ" > "$LIVE"
|
|
got=$(sha256sum "$LIVE" | awk '{print $1}')
|
|
[ "$got" = "$(want_plain)" ] || { echo "restore verification FAILED" >&2; exit 1; }
|
|
echo "restored $LIVE to pristine state"
|
|
echo "note: the emulator reads the image at boot, so power-cycle to pick it up"
|
|
;;
|
|
*)
|
|
echo "usage: $0 [restore|--verify|--diff]" >&2
|
|
exit 2
|
|
;;
|
|
esac
|