#!/bin/bash
# rootpw-emission.sh — R-61 slice 1 regression harness for build-felhom-iso.sh's root-password
# emission. Runs ON THE BUILD HOST (needs docker + the assistant image present for the build
# script's preflight, but --dry-run never starts a container). Asserts, against a real dry-run
# with a fake source ISO:
#   1. the 0600 sibling <iso>.rootpw.txt exists and names the ISO it belongs to;
#   2. its plaintext MATCHES the hash actually rendered into answer.toml
#      (openssl passwd -6 -salt <extracted> cross-check — file <-> answer, not file <-> itself);
#   3. the plaintext appears NOWHERE in the build's stdout/stderr;
#   4. the manifest heredoc in the build script carries the rootpw.txt POINTER and never
#      references the plaintext variable (the manifest gets pasted into committed REPORTs —
#      the plaintext must be structurally unable to ride along).
# Red-proof (documented, run manually): add `root-password-plain : ${ROOT_PLAIN}` to the manifest
# heredoc -> assertion 4 fails -> restore.
set -uo pipefail
HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
BUILD="$HERE/../build-felhom-iso.sh"
fail=0
say() { echo "TEST: $*"; }
check() { if eval "$2"; then echo "  ok: $1"; else echo "  FAIL: $1"; fail=1; fi; }

SCRATCH="$(mktemp -d "${TMPDIR:-/tmp}/felhom-rootpw-test.XXXXXX")"
trap 'chmod -R u+w "$SCRATCH" 2>/dev/null; rm -rf "$SCRATCH"' EXIT
mkdir -p "$SCRATCH/tmp" "$SCRATCH/out"

# fake source ISO (the dry run only sha-verifies it; nothing reads its content as an ISO)
FAKE_ISO="$SCRATCH/proxmox-ve_9.9-1.iso"
head -c 65536 /dev/urandom > "$FAKE_ISO"
FAKE_SHA="$(sha256sum "$FAKE_ISO" | awk '{print $1}')"

say "dry-run build (pairing, nested-canary) with FELHOM_ISO_KEEP_WORK=1"
BUILD_LOG="$SCRATCH/build.log"
FELHOM_ISO_KEEP_WORK=1 TMPDIR="$SCRATCH/tmp" bash "$BUILD" \
    --pve-iso "$FAKE_ISO" --iso-sha256 "$FAKE_SHA" \
    --profile "$HERE/../profiles/nested-canary.profile" \
    --pairing --out "$SCRATCH/out" --dry-run > "$BUILD_LOG" 2>&1
rc=$?
check "dry-run exited 0" "[ $rc -eq 0 ]"

ROOTPW_FILE="$(ls "$SCRATCH"/out/*.rootpw.txt 2>/dev/null | head -1)"
check "rootpw sibling file exists" "[ -n \"$ROOTPW_FILE\" ] && [ -f \"$ROOTPW_FILE\" ]"
check "rootpw file mode is 0600" "[ \"\$(stat -c %a \"$ROOTPW_FILE\")\" = 600 ]"

PW="$(awk '{print $1}' "$ROOTPW_FILE" 2>/dev/null)"
ISO_NAME="$(awk '{print $2}' "$ROOTPW_FILE" 2>/dev/null)"
check "password field has the throwaway shape" "[[ \"$PW\" == felhom-throwaway-* ]]"
check "file names the ISO it belongs to" "[ \"$ISO_NAME.rootpw.txt\" = \"$(basename "$ROOTPW_FILE")\" ]"

# cross-check: the plaintext must correspond to the hash RENDERED INTO THE ANSWER (kept workspace)
ANSWER="$(ls "$SCRATCH"/tmp/felhom-iso.*/answer.toml 2>/dev/null | head -1)"
check "kept workspace has answer.toml" "[ -n \"$ANSWER\" ] && [ -f \"$ANSWER\" ]"
# the hash contains literal $-signs — compare OUTSIDE check()'s eval and pass only a verdict in
HASH="$(sed -n 's/^root-password-hashed = "\(.*\)"$/\1/p' "$ANSWER" 2>/dev/null)"
SALT="$(printf '%s' "$HASH" | awk -F'$' '{print $3}')"
RECOMPUTED="$(openssl passwd -6 -salt "$SALT" "$PW" 2>/dev/null)"
HASH_MATCH=no; [ -n "$HASH" ] && [ "$RECOMPUTED" = "$HASH" ] && HASH_MATCH=yes
check "plaintext matches the answer's rendered hash" "[ \"$HASH_MATCH\" = yes ]"

# the plaintext must never surface on stdout/stderr
check "plaintext absent from build stdout/stderr" "! grep -qF \"$PW\" \"$BUILD_LOG\""

# manifest heredoc guard (source-level: dry-run emits no manifest; the live build's manifest is
# additionally verified in the ISO-build leg). Pointer present, plaintext variable absent.
# the heredoc text contains ${VAR} references — grep it outside check()'s eval, pass verdicts in
MANIFEST_SRC="$(awk '/^cat > "\$OUT_ISO.manifest.txt" <<EOF$/{f=1;next} f&&/^EOF$/{exit} f' "$BUILD")"
SRC_FOUND=no;    [ -n "$MANIFEST_SRC" ] && SRC_FOUND=yes
HAS_POINTER=no;  grep -q 'rootpw.txt' <<< "$MANIFEST_SRC" && HAS_POINTER=yes
LEAKS_PLAIN=no;  grep -q 'ROOT_PLAIN' <<< "$MANIFEST_SRC" && LEAKS_PLAIN=yes
check "manifest heredoc found in build script" "[ \"$SRC_FOUND\" = yes ]"
check "manifest carries the rootpw.txt pointer" "[ \"$HAS_POINTER\" = yes ]"
check "manifest never references ROOT_PLAIN" "[ \"$LEAKS_PLAIN\" = no ]"

echo "=================================================="
if [ $fail -eq 0 ]; then echo "ALL ROOTPW-EMISSION TESTS PASSED"; else echo "SOME TESTS FAILED"; fi
exit $fail