feat: give the classroom a desktop instead of a shell
The whole appliance UI is now configuration for a desktop Debian already ships: a Plasma 6.3 session with a colour scheme, a look and feel package that builds the bar, window rules, and KDE's own Kiosk restrictions. Two things were measured rather than assumed, and both changed a decision. Plasma restarts a crashed panel three times a minute and then gives up, which is the failure a classroom has already had. Four lines of systemd drop-in make it unconditional; the panel then survived eight SIGKILLs a second apart, back each time in 2.4s. Plasma draws a minimised task and a background task identically, so the five states the room needs cannot all be shown. Rather than write a task manager, the classroom removes minimise: clicking a launcher always means show me this. Co-Authored-By: Claude Opus 5 <[email protected]>
This commit is contained in:
ekklesia
co-authored by
Claude Opus 5
Claude Opus 5
parent
bfc7caf28f
commit
87b55761c6
Executable
+62
@@ -0,0 +1,62 @@
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#!/usr/bin/env python3
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"""Generate the light colour scheme from the dark one.
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There is one set of design tokens, not two themes. The light scheme is the
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same file with the roles swapped, so a colour can only be changed in one
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place and the two can never drift apart.
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"""
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import pathlib
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import re
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ROOT = pathlib.Path(__file__).resolve().parent.parent
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COLORS = ROOT / "config" / "plasma" / "colors"
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# dark value -> light value
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ROLES = {
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"20,28,32": "242,245,244", # window background
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"25,35,40": "233,238,237", # alternate
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"15,23,26": "255,255,255", # view background
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"18,26,30": "236,241,240", # header
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"16,23,26": "228,234,233", # header, inactive
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"30,42,47": "225,231,230", # button alternate
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"230,237,239": "22,35,42", # normal text
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"147,165,170": "96,116,122", # inactive text
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"170,186,191": "80,99,105", # inactive header text
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"125,142,147": "120,138,144",
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"79,179,168": "46,140,130", # accent
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"126,196,255": "26,110,180", # link
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"227,106,106": "192,57,57", # negative
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"224,177,92": "166,116,24", # neutral
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"111,207,151": "38,142,86", # positive
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"156,138,222": "104,80,180", # visited
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"14,21,24": "255,255,255", # text on a selection
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"10,16,18": "255,255,255",
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}
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HEADER = (
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"# Ekklesia Classroom — light.\n"
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"#\n"
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"# GENERATED from EkklesiaDark.colors by tools/build-light-scheme.\n"
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"# Edit the dark scheme and regenerate; do not edit this file by hand."
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)
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def main():
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dark = (COLORS / "EkklesiaDark.colors").read_text()
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light = dark
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for old, new in sorted(ROLES.items(), key=lambda item: -len(item[0])):
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light = re.sub(rf"(?<![\d,]){re.escape(old)}(?![\d,])", "\0" + new, light)
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light = light.replace("\0", "")
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light = light.replace("Ekklesia Classroom Dark", "Ekklesia Classroom Light")
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light = light.replace("ColorScheme=EkklesiaDark", "ColorScheme=EkklesiaLight")
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light = light.replace("# Ekklesia Classroom — dark. The default.", HEADER)
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(COLORS / "EkklesiaLight.colors").write_text(light)
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print("wrote", COLORS / "EkklesiaLight.colors")
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if __name__ == "__main__":
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main()
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Executable
+180
@@ -0,0 +1,180 @@
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#!/usr/bin/env python3
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"""Render the classroom's idle desktop background.
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This is a STAND-IN. The classroom's chosen wallpaper is an illustrated
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landscape that is not in this repository; when it arrives it replaces the
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output of this script at the same path and nothing else changes.
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It exists so the desktop can be judged in the right palette rather than
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against the bright confetti background it is replacing: sage, teal, blue
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and lavender, a river leading into the picture, and a large quiet area in
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the upper middle where nothing happens.
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No image library is installed on the development host, so the PNG is
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written by hand — zlib and struct are enough for a truecolour image.
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"""
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import math
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import pathlib
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import struct
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import zlib
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WIDTH = 1920
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HEIGHT = 1080
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OUT = pathlib.Path(__file__).resolve().parent.parent / "config" / "wallpapers"
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def mix(a, b, t):
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t = 0.0 if t < 0 else 1.0 if t > 1 else t
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return tuple(a[i] + (b[i] - a[i]) * t for i in range(3))
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def ease(t):
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"""Smoothstep. Bands in a gradient are the one thing that would read as
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a rendering fault rather than as a picture."""
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t = 0.0 if t < 0 else 1.0 if t > 1 else t
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return t * t * (3 - 2 * t)
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# The palette, top of the sky downwards.
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SKY = [
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(0.00, (34, 38, 58)), # deep lavender-slate
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(0.30, (58, 68, 96)), # lavender
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(0.55, (86, 108, 130)), # blue
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(0.78, (139, 165, 168)), # sage haze at the horizon
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(1.00, (178, 198, 192)),
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]
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HORIZON = 0.56 # where the land starts, as a fraction of the height
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GLOW_X, GLOW_Y = 0.56, 0.545
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GLOW = (232, 232, 214)
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RIDGES = [
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# (base height, amplitude, wavelength, phase, colour, haze)
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(0.575, 0.028, 2.1, 0.4, (74, 96, 110), 0.55),
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(0.615, 0.040, 1.5, 2.2, (60, 84, 92), 0.34),
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(0.665, 0.052, 1.1, 4.1, (48, 72, 74), 0.18),
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]
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RIVER_TOP = 0.585
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RIVER_COLOUR = (96, 140, 146)
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RIVER_LIGHT = (186, 212, 202)
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BANK = (34, 52, 48) # the sage foreground the river runs between
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def sky_colour(y):
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t = y / HEIGHT
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for i in range(len(SKY) - 1):
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t0, c0 = SKY[i]
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t1, c1 = SKY[i + 1]
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if t <= t1 or i == len(SKY) - 2:
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return mix(c0, c1, ease((t - t0) / (t1 - t0)))
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return SKY[-1][1]
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def river_edges(y):
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"""The river narrows towards the horizon and opens towards the viewer,
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which is what makes it lead into the picture rather than across it."""
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t = (y / HEIGHT - RIVER_TOP) / (1 - RIVER_TOP)
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if t < 0:
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return None
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t = ease(t)
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centre = 0.56 - 0.14 * t * t
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half = 0.004 + 0.30 * t * t
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return (centre - half) * WIDTH, (centre + half) * WIDTH
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def render():
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rows = []
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for y in range(HEIGHT):
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base = sky_colour(y)
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row = bytearray()
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edges = river_edges(y)
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yn = y / HEIGHT
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# Ridge heights for this column are cheap to evaluate, so the land
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# is computed per pixel rather than filled as polygons.
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for x in range(WIDTH):
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xn = x / WIDTH
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r, g, b = base
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# A soft light low in the sky, off centre. It is the only
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# bright thing in the picture.
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dx = (xn - GLOW_X) * 1.7
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dy = yn - GLOW_Y
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d = math.sqrt(dx * dx + dy * dy)
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glow = math.exp(-(d * d) / 0.055) * 0.55
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if glow > 0.002:
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r, g, b = mix((r, g, b), GLOW, glow)
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land = None
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for height, amp, wavelength, phase, colour, haze in RIDGES:
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ridge = height - amp * (
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0.6 * math.sin(xn * math.pi * 2 * wavelength + phase)
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+ 0.4 * math.sin(xn * math.pi * 2 * wavelength * 2.3 + phase * 1.7)
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)
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if yn >= ridge:
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# Nearer ridges are darker and less hazy, which is the
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# whole of the depth in this picture.
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shade = mix(colour, (r, g, b), haze)
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depth = ease((yn - ridge) / 0.16)
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land = mix(shade, tuple(c * 0.82 for c in shade), depth)
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if land is not None:
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r, g, b = land
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if edges is not None:
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left, right = edges
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if left <= x <= right:
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width = max(right - left, 1.0)
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across = (x - left) / width
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# Light gathers down the middle of the water and the
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# banks stay dark, so the river reads as a surface.
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sheen = math.exp(-((across - 0.5) ** 2) / 0.06)
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ripple = 0.5 + 0.5 * math.sin(
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yn * 130 + math.sin(xn * 18) * 1.4
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)
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water = mix(RIVER_COLOUR, RIVER_LIGHT, 0.30 * sheen + 0.10 * ripple)
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water = mix(water, (r, g, b), max(0.0, 0.45 - 0.45 * ease((yn - RIVER_TOP) / 0.25)))
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edge = min(across, 1 - across)
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r, g, b = mix(BANK, water, ease(edge / 0.05))
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elif yn > RIVER_TOP + 0.10:
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near = ease((yn - RIVER_TOP - 0.10) / 0.34)
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r, g, b = mix((r, g, b), BANK, near * 0.85)
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# The bottom of the screen carries the bar. Settling it down
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# keeps the panel legible without putting a band across the
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# picture.
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if yn > 0.78:
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r, g, b = mix((r, g, b), (16, 24, 28), ease((yn - 0.78) / 0.24) * 0.62)
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row += bytes((int(r + 0.5) & 255, int(g + 0.5) & 255, int(b + 0.5) & 255))
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rows.append(bytes(row))
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return rows
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def write_png(path, rows):
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raw = b"".join(b"\x00" + row for row in rows)
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def chunk(tag, data):
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payload = tag + data
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return (
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struct.pack(">I", len(data))
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+ payload
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+ struct.pack(">I", zlib.crc32(payload) & 0xFFFFFFFF)
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)
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png = b"\x89PNG\r\n\x1a\n"
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png += chunk(b"IHDR", struct.pack(">IIBBBBB", WIDTH, HEIGHT, 8, 2, 0, 0, 0))
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png += chunk(b"IDAT", zlib.compress(raw, 9))
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png += chunk(b"IEND", b"")
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path.write_bytes(png)
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if __name__ == "__main__":
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OUT.mkdir(parents=True, exist_ok=True)
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target = OUT / "classroom-calm.png"
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write_png(target, render())
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print(f"wrote {target} ({target.stat().st_size} bytes)")
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@@ -50,3 +50,23 @@ CMD ["/sbin/init"]
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# sanctioned way to capture a KWin session that has no outer compositor.
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RUN apt-get update && apt-get install -y --no-install-recommends kde-spectacle \
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&& rm -rf /var/lib/apt/lists/*
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# The classroom's browser, from Google's own repository, the same way a
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# classroom machine gets it. Testing the browser question on a different
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# browser would not answer it.
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RUN apt-get update && apt-get install -y --no-install-recommends gnupg \
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&& install -d -m 0755 /etc/apt/keyrings \
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&& curl -fsS https://dl.google.com/linux/linux_signing_key.pub \
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| gpg --dearmor --batch --yes --output /etc/apt/keyrings/google-chrome.gpg \
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&& echo 'deb [arch=amd64 signed-by=/etc/apt/keyrings/google-chrome.gpg] https://dl.google.com/linux/chrome/deb/ stable main' \
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> /etc/apt/sources.list.d/google-chrome.list \
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&& apt-get update && apt-get install -y --no-install-recommends google-chrome-stable \
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&& rm -rf /var/lib/apt/lists/*
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# VLC, CUPS and PipeWire: the rest of the classroom's runtime, so the
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# desktop is judged with the room's real applications in it.
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RUN apt-get update && apt-get install -y --no-install-recommends \
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vlc vlc-plugin-base cups cups-client cups-filters \
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pipewire pipewire-pulse wireplumber pulseaudio-utils \
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libnotify-bin \
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&& rm -rf /var/lib/apt/lists/*
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Executable
+70
@@ -0,0 +1,70 @@
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#!/bin/bash
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# Put the classroom desktop onto a machine, from the repository, at the
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# paths the package will use. Run as root inside the lab.
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#
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# Every destination here is a normal system path that Plasma already reads.
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# There is no classroom daemon in this list, and nothing is generated: the
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# desktop is a set of files.
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set -euo pipefail
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SRC="${1:-/srv/classroom}"
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install -Dm644 "$SRC/config/plasma/xdg/kdeglobals" /etc/xdg/kdeglobals
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install -Dm644 "$SRC/config/plasma/xdg/kwinrc" /etc/xdg/kwinrc
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install -Dm644 "$SRC/config/plasma/xdg/kwinrulesrc" /etc/xdg/kwinrulesrc
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install -Dm644 "$SRC/config/plasma/xdg/kscreenlockerrc" /etc/xdg/kscreenlockerrc
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install -Dm644 "$SRC/config/plasma/xdg/ksmserverrc" /etc/xdg/ksmserverrc
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install -Dm644 "$SRC/config/plasma/xdg/krunnerrc" /etc/xdg/krunnerrc
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install -Dm644 "$SRC/config/plasma/xdg/plasmanotifyrc" /etc/xdg/plasmanotifyrc
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install -Dm644 "$SRC/config/plasma/colors/EkklesiaDark.colors" \
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/usr/share/color-schemes/EkklesiaDark.colors
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install -Dm644 "$SRC/config/plasma/colors/EkklesiaLight.colors" \
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/usr/share/color-schemes/EkklesiaLight.colors
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LNF=/usr/share/plasma/look-and-feel/org.ekklesia.classroom.desktop
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rm -rf "$LNF"
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install -Dm644 "$SRC/config/plasma/lookandfeel/metadata.json" "$LNF/metadata.json"
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install -Dm644 "$SRC/config/plasma/lookandfeel/contents/defaults" \
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"$LNF/contents/defaults"
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install -Dm644 \
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"$SRC/config/plasma/lookandfeel/contents/layouts/org.kde.plasma.desktop-layout.js" \
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"$LNF/contents/layouts/org.kde.plasma.desktop-layout.js"
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for entry in "$SRC"/config/plasma/applications/*.desktop; do
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install -Dm644 "$entry" "/usr/share/applications/$(basename "$entry")"
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done
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# Entries that deliberately shadow a vendor one. XDG_DATA_DIRS searches
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# /usr/local/share before /usr/share, so these win without touching, and
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# without being overwritten by, the package that provides the original.
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for entry in "$SRC"/config/plasma/applications-local/*.desktop; do
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install -Dm644 "$entry" "/usr/local/share/applications/$(basename "$entry")"
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done
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install -Dm644 "$SRC/config/plasma/solid/ekklesia-dvd.desktop" \
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/usr/share/solid/actions/ekklesia-dvd.desktop
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for icon in "$SRC"/config/icons/ekklesia-*.svg; do
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[ -e "$icon" ] || continue
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install -Dm644 "$icon" \
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"/usr/share/icons/hicolor/scalable/apps/$(basename "$icon")"
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done
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install -Dm644 "$SRC/config/wallpapers/classroom-calm.png" \
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/usr/share/backgrounds/ekklesia/classroom-calm.png
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install -Dm644 "$SRC/systemd/user/plasma-plasmashell.service.d/ekklesia-classroom.conf" \
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/etc/systemd/user/plasma-plasmashell.service.d/ekklesia-classroom.conf
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for script in classroom-browser classroom-wonderink; do
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[ -e "$SRC/scripts/$script" ] || continue
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install -Dm755 "$SRC/scripts/$script" "/usr/local/bin/$script"
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done
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command -v gtk-update-icon-cache >/dev/null 2>&1 \
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&& gtk-update-icon-cache -qtf /usr/share/icons/hicolor || true
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command -v update-desktop-database >/dev/null 2>&1 \
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&& update-desktop-database -q /usr/share/applications || true
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echo "classroom desktop installed"
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Executable
+37
@@ -0,0 +1,37 @@
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#!/bin/bash
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# Run a KWin script in the session under test and print what it logged.
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#
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# KWin's scripting interface is the only way to ask the compositor what it
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# actually believes about a window — class, caption, desktop file, geometry,
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# minimised, keep-above. Everything this experiment claims about window
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# behaviour is measured through here rather than inferred from a screenshot.
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set -euo pipefail
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NAME="${LAB_NAME:-classroom-v2-lab}"
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SCRIPT="${1:?usage: kwin-script FILE}"
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ID="labscript$RANDOM"
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# /tmp inside the lab is a tmpfs created after the container started, which
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# `docker cp` cannot see, so the script is piped in instead.
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docker exec -i "$NAME" sh -c "cat > /tmp/$ID.js && chown classroom /tmp/$ID.js" \
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< "$SCRIPT"
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run() {
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docker exec -u classroom \
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-e XDG_RUNTIME_DIR=/run/user/1000 \
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-e DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus \
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-e HOME=/home/classroom \
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"$NAME" "$@"
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}
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since=$(docker exec "$NAME" date '+%Y-%m-%d %H:%M:%S')
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number=$(run qdbus6 org.kde.KWin /Scripting org.kde.kwin.Scripting.loadScript \
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"/tmp/$ID.js" "$ID" 2>/dev/null | tr -d '\r')
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run qdbus6 org.kde.KWin "/Scripting/Script$number" org.kde.kwin.Script.run >/dev/null 2>&1
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sleep 1
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run qdbus6 org.kde.KWin /Scripting org.kde.kwin.Scripting.unloadScript "$ID" >/dev/null 2>&1 || true
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# KWin's print() reaches the journal, tagged by the wrapper process.
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docker exec "$NAME" journalctl --since "$since" --no-pager -o cat 2>/dev/null \
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| grep -a "LAB:" | sed 's/.*LAB://'
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+40
-6
@@ -75,8 +75,19 @@ down)
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;;
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outer-up)
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# A headless compositor has no input devices, and a wl_seat with no
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# pointer capability never gives the session under test a pointer to
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# click with — sway's cursor commands then report success and move
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# nothing. So the lab runs wlroots' libinput backend as well, over the
|
||||
# devices the privileged container inherits, with seatd standing in for
|
||||
# the login session it does not have. Clicks in this experiment are
|
||||
# real pointer events arriving through libinput.
|
||||
docker exec "$NAME" sh -c 'pgrep -x seatd >/dev/null || \
|
||||
(SEATD_VTBOUND=0 setsid seatd -g input > /tmp/seatd.log 2>&1 &)'
|
||||
docker exec "$NAME" usermod -aG input classroom 2>/dev/null || true
|
||||
sleep 2
|
||||
session_env \
|
||||
-e WLR_BACKENDS=headless -e WLR_LIBINPUT_NO_DEVICES=1 \
|
||||
-e WLR_BACKENDS=headless,libinput -e LIBSEAT_BACKEND=seatd \
|
||||
-e WLR_RENDERER=pixman -e LIBGL_ALWAYS_SOFTWARE=1 \
|
||||
-d "$NAME" sh -c 'exec sway -c /srv/classroom/tools/lab/outer-sway.conf \
|
||||
> /tmp/outer-sway.log 2>&1'
|
||||
@@ -91,6 +102,7 @@ plasma-up)
|
||||
session_env \
|
||||
-e WAYLAND_DISPLAY="$OUTER" -e XDG_SESSION_TYPE=wayland \
|
||||
-e XDG_CURRENT_DESKTOP=KDE -e LIBGL_ALWAYS_SOFTWARE=1 \
|
||||
-e QT_LOGGING_RULES="kwin_scripting.debug=true" \
|
||||
-d "$NAME" sh -c 'exec startplasma-wayland > /tmp/plasma.log 2>&1'
|
||||
for _ in $(seq 1 60); do
|
||||
docker exec "$NAME" pgrep -x plasmashell >/dev/null 2>&1 && break
|
||||
@@ -114,27 +126,45 @@ session)
|
||||
;;
|
||||
|
||||
shot)
|
||||
# shot NAME [--delay SECONDS]
|
||||
# shot NAME [GEOMETRY] — geometry as grim wants it, e.g. "0,980 1920x100"
|
||||
name="${2:?usage: lab shot NAME}"
|
||||
outer grim /tmp/lab-shot.png >/dev/null
|
||||
if [[ -n "${3:-}" ]]; then
|
||||
outer grim -g "$3" /tmp/lab-shot.png >/dev/null
|
||||
else
|
||||
outer grim /tmp/lab-shot.png >/dev/null
|
||||
fi
|
||||
mkdir -p "$SHOTS"
|
||||
docker exec "$NAME" cat /tmp/lab-shot.png > "$SHOTS/$name.png"
|
||||
echo "$SHOTS/$name.png"
|
||||
;;
|
||||
|
||||
click)
|
||||
# click X Y — a real pointer press in the session under test
|
||||
# Absolute, through sway's own seat. This only works because the seat
|
||||
# has a pointer capability at all, which is what the uinput device in
|
||||
# `outer-up` is for.
|
||||
outer swaymsg seat - cursor set "$2" "$3" >/dev/null
|
||||
sleep 0.3
|
||||
sleep 0.4
|
||||
outer swaymsg seat - cursor press button1 >/dev/null
|
||||
sleep 0.1
|
||||
sleep 0.15
|
||||
outer swaymsg seat - cursor release button1 >/dev/null
|
||||
sleep 0.5
|
||||
;;
|
||||
|
||||
move)
|
||||
outer swaymsg seat - cursor set "$2" "$3" >/dev/null
|
||||
;;
|
||||
|
||||
drag)
|
||||
outer swaymsg seat - cursor set "$2" "$3" >/dev/null
|
||||
sleep 0.3
|
||||
outer swaymsg seat - cursor press button1 >/dev/null
|
||||
sleep 0.3
|
||||
outer swaymsg seat - cursor set "$4" "$5" >/dev/null
|
||||
sleep 0.3
|
||||
outer swaymsg seat - cursor release button1 >/dev/null
|
||||
sleep 0.4
|
||||
;;
|
||||
|
||||
key)
|
||||
shift
|
||||
outer wtype "$@"
|
||||
@@ -148,6 +178,8 @@ sh)
|
||||
run) shift; session_env "$NAME" "$@" ;;
|
||||
irun) shift; session_env -it "$NAME" "$@" ;;
|
||||
inner) shift; inner "$@" ;;
|
||||
inner-d) shift; session_env -d -e WAYLAND_DISPLAY=wayland-0 -e XDG_CURRENT_DESKTOP=KDE \
|
||||
-e QT_QPA_PLATFORM=wayland "$NAME" "$@" ;;
|
||||
inner-it) shift; session_env -it -e WAYLAND_DISPLAY=wayland-0 -e XDG_CURRENT_DESKTOP=KDE "$NAME" "$@" ;;
|
||||
outer) shift; outer "$@" ;;
|
||||
|
||||
@@ -164,9 +196,11 @@ usage: tools/lab/lab COMMAND
|
||||
plasma-down stop the Plasma session
|
||||
shot NAME capture the screen to docs/screenshots/NAME.png
|
||||
click X Y press the pointer at a screen position
|
||||
drag X1 Y1 X2 Y2 drag from one position to another
|
||||
move X Y move the pointer
|
||||
key ARGS... wtype, aimed at the session
|
||||
inner CMD... run CMD as a client of the Plasma session
|
||||
inner-d CMD... the same, detached
|
||||
outer CMD... run CMD against the lab compositor
|
||||
run CMD... run CMD as the classroom user, no display
|
||||
sh root shell in the lab
|
||||
|
||||
Reference in New Issue
Block a user