Classroom_Desktop/tools/lab/wonderink-print-check

#!/bin/bash
# Does Wonder Ink print — and does a job really reach CUPS?
#
# The lab's CUPS gets an "Elmer" built from Elmer's own PPD and options,
# writing to a file instead of socket://10.10.0.155:9100, so every job
# goes through the same filters the real printer's jobs do and none can
# reach a printer. A second queue refuses jobs, to show a teacher is told.
#
# Each scenario runs the INSTALLED classroom-wonderink under a real
# QtWebEngine (offscreen), presses the preview's buttons, and is then
# judged by CUPS's own record of what it was given.
#
#   tools/lab/wonderink-print-check [SCENARIO...]
set -uo pipefail

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
NAME="${LAB_NAME:-classroom-v2-lab}"
COMMAND="${WONDERINK:-/usr/local/bin/classroom-wonderink}"

lab() { docker exec -i "$NAME" bash -c "$1"; }

docker cp "$ROOT/tools/lab/wonderink-print-rig.py" "$NAME:/tmp/wonderink-print-rig.py" >/dev/null
lab 'chmod a+r /tmp/wonderink-print-rig.py'

# The church's printer network is fenced off inside the lab. Checked, not
# assumed: a lab job must never be able to reach the real Elmer.
lab 'ip route replace blackhole 10.10.0.0/16 2>/dev/null
     ! timeout 3 bash -c "exec 3<>/dev/tcp/10.10.0.155/9100" 2>/dev/null' || {
    echo "REFUSING TO CONTINUE: the real Elmer is reachable from the lab" >&2
    exit 1
}

lab '
set -e
export DEBIAN_FRONTEND=noninteractive
command -v lpadmin >/dev/null && command -v pdftoppm >/dev/null || \
    apt-get install -y -qq cups cups-client poppler-utils >/dev/null 2>&1
dpkg -s foomatic-db-compressed-ppds >/dev/null 2>&1 || \
    apt-get install -y -qq foomatic-db-compressed-ppds cups-filters ghostscript >/dev/null 2>&1
grep -q "^FileDevice Yes" /etc/cups/cups-files.conf || echo "FileDevice Yes" >> /etc/cups/cups-files.conf
pkill -x cupsd || true; sleep 1; /usr/sbin/cupsd; sleep 1
cupsctl --debug-logging
: > /var/log/cups/error_log
mkdir -p /var/lab-print && chown lp /var/lab-print
driver="foomatic-db-compressed-ppds:0/ppd/foomatic-ppd/Generic-PCL_6_PCL_XL_Printer-pxlcolor.ppd"
for q in $(lpstat -e 2>/dev/null); do lpadmin -x "$q"; done
lpadmin -p Elmer -E -v file:///var/lab-print/elmer.pxl -m "$driver" \
    -D "LAB STAND-IN for Elmer: its PPD, a file for a printer" \
    -o PrintoutMode=Normal -o ColorModel=Color 2>/dev/null
lpadmin -d Elmer
lpadmin -p Refusing -E -v file:///dev/null -m "$driver" -D "LAB: refuses jobs" 2>/dev/null
cupsreject Refusing
id teacher >/dev/null 2>&1 || useradd -m teacher
install -d -o teacher -m 700 /tmp/teacher-rt
# An inline PDF, served the way a site shows one rather than sends it.
mkdir -p /tmp/www
pgrep -f "http.server 8088" >/dev/null || (cd /tmp/www && setsid python3 -m http.server 8088 >/dev/null 2>&1 &)
' || { echo "could not prepare the lab's CUPS" >&2; exit 1; }

passed=0
failed=0

judge() {
    if eval "$2"; then
        printf '  \033[32mPASS\033[0m  %s\n' "$1"
        passed=$((passed + 1))
    else
        printf '  \033[31mFAIL\033[0m  %s\n' "$1"
        failed=$((failed + 1))
    fi
}

# Runs one scenario; leaves its output in $out and the jobs it caused in $jobs.
run() {
    local before
    before=$(lab 'lpstat -W all -o 2>/dev/null | wc -l')
    out=$(lab "su teacher -c 'cd /tmp; XDG_RUNTIME_DIR=/tmp/teacher-rt QT_QPA_PLATFORM=offscreen \
        QTWEBENGINE_CHROMIUM_FLAGS=\"--no-sandbox --disable-gpu\" \
        timeout 120 python3 /tmp/wonderink-print-rig.py $COMMAND $1 2>&1'; echo \"exit=\$?\"")
    sleep 3
    jobs=$(lab "lpstat -W all -o | tail -n +$((before + 1)) | awk '{print \$1}' | tr '\n' ' '")
    job_options() { lab "grep -E '\\[Job ${1#*-}\\] argv\\[(4|5)\\]' /var/log/cups/error_log"; }
    job_device() { lab "grep -E '\\[Job ${1#*-}\\]' /var/log/cups/error_log | grep -oE 'sDEVICE=[a-z]+' | sort -u"; }
}

count() { wc -w <<< "$jobs"; }
said() { grep -q -- "$1" <<< "$out"; }
exited_cleanly() { said 'exit=0' && ! said 'Traceback' && ! said 'Segmentation' && ! said 'Aborted'; }

scenarios=("$@")
[[ ${#scenarios[@]} -gt 0 ]] || scenarios=(web pdf pdf-options pdf-viewer-button inline
    options bad-range broken cancel page-closes-itself close-window page-prints-again repeat)

# The inline scenario needs a PDF to serve; the worksheet scenario writes one.
lab 'test -f /tmp/www/ark.pdf' || { run pdf >/dev/null; lab 'cp "/home/teacher/Downloads/Wonder Ink/Colour the Ark.pdf" /tmp/www/ark.pdf; chmod a+r /tmp/www/ark.pdf'; }

for scenario in "${scenarios[@]}"; do
    echo "$scenario"
    run "$scenario"

    judge "Wonder Ink did not crash, and exited by itself" exited_cleanly

    # The preview has to SHOW the page, not merely count it. A preview
    # that printed the right thing while showing a blank was what the
    # first version of this check let through.
    if said 'PREVIEW '; then
        judge "the preview drew the page it will print" "! grep 'PREVIEW ' <<< \"\$out\" | grep -q 'shown=False'"
    fi

    case "$scenario" in
    web)
        judge "the preview showed the lesson, 3 Letter pages, Elmer chosen" \
            "said \"pages=3 printers=\\['Elmer', 'Refusing'\\] paper=Letter\""
        judge "one job reached CUPS" '[[ $(count) -eq 1 ]]'
        judge "Elmer's filters printed it in colour" '[[ "$(job_device $jobs)" == *pxlcolor* ]]'
        judge "and nothing was left behind" "said 'scratch_left=\\[\\]'" ;;
    pdf|pdf-viewer-button)
        judge "the preview showed the worksheet's own 2 pages" "said 'pages=2'"
        judge "one job reached CUPS" '[[ $(count) -eq 1 ]]' ;;
    pdf-options)
        judge "one job" '[[ $(count) -eq 1 ]]'
        judge "page 2 only, three copies" \
            '[[ "$(job_options $jobs)" == *"argv[4]=\"3\""* && "$(job_options $jobs)" == *page-ranges=2* ]]'
        judge "in black and white, by the driver's own option" \
            '[[ "$(job_options $jobs)" == *ColorModel=Grayscale* && "$(job_device $jobs)" == *pxlmono* ]]' ;;
    inline)
        judge "the inline PDF was recognised" "said \"mime='application/pdf'\""
        judge "and opened as a worksheet tab" "said 'current_is_pdf=True'"
        judge "one job reached CUPS" '[[ $(count) -eq 1 ]]' ;;
    options)
        judge "pages 2-3, two copies, black and white" \
            '[[ "$(job_options $jobs)" == *page-ranges=2-3* && "$(job_options $jobs)" == *"argv[4]=\"2\""* && "$(job_device $jobs)" == *pxlmono* ]]' ;;
    bad-range)
        judge "a page that does not exist is explained, not printed" "said 'This document has 3 pages'"
        judge "and once corrected, one job" '[[ $(count) -eq 1 ]]' ;;
    broken)
        judge "a refusing printer is reported in CUPS's words" "said 'Refusing did not take the job'"
        judge "and no job is claimed" '[[ $(count) -eq 0 ]] && ! said "NOTIFY Sent"' ;;
    cancel)
        judge "Cancel sends nothing" '[[ $(count) -eq 0 ]]' ;;
    page-closes-itself)
        judge "the preview says the page closed, and cannot print" \
            "said \"status='The page was closed.' print_enabled=False\""
        judge "and sends nothing" '[[ $(count) -eq 0 ]]' ;;
    close-window)
        judge "closing Wonder Ink with the preview open sends nothing" '[[ $(count) -eq 0 ]]' ;;
    page-prints-again)
        judge "a second print request does not open a second preview" "said 'still one preview=True'"
        judge "one job" '[[ $(count) -eq 1 ]]' ;;
    repeat)
        judge "five prints in a row, five jobs" '[[ $(count) -eq 5 ]]' ;;
    esac

    [[ "$failed" -eq 0 ]] || { echo "$out" | tail -15 | sed 's/^/      /'; }
done

echo
echo "$passed passed, $failed failed"
[[ "$failed" -eq 0 ]]