Bernardo Magri
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Answering "how do I give you root": you don't. tools/plymouth-preview.sh renders the splash — LUKS dialog included — into X11 windows in ~10s with no reboot, no root and no DRM: - unshare -rm = user + mount namespace; every mount dies with it. - /run/plymouth is BOTH the socket dir and the compiled-in plugin path (`strings plymouthd` → /run/plymouth/plugins/), so we bind a writable dir over it AND recreate its symlinks — miss those and plymouth can't find x11.so, silently skips X11 and reaches for a tty. - never pass --tty (main.c:2133 takes the X11 path only while default_tty is unset); /dev/dri is masked so a preview physically cannot mode-set a real output — which matters on a docked session (#127). - PLY_CREATE_FAKE_MULTI_HEAD_SETUP fakes 800x600 + 640x480 heads. - debug wants plymouth.debug=stream: — `file:` buffers and yields nothing. What it proved immediately: with a STABLE two-head canvas the current theme centres correctly on both heads. So the geometry is fine and #137 really is the timing bug (positions frozen at parse time vs a canvas that resizes when a head arrives) — recorded in the item. And it caught my own fix: hoisting positions into layout() rendered the background on both heads and nothing else — no logo, no bar — with NO parse error logged. Reverted rather than shipped, because that script draws the passphrase box on an encrypted machine. #137 carries the failure, the prime suspect (plymouth script scope: assignment lands in `local` unless the name already exists) and the fast edit/render loop for the next attempt. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
65 lines
3.2 KiB
Bash
Executable File
65 lines
3.2 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Render the Plymouth splash in X11 windows — no root, no reboot, no DRM (#137).
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#
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# tools/plymouth-preview.sh [<theme-store-path>]
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#
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# Plymouth is otherwise untestable without rebooting, which is a poor loop for
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# a script that draws the LUKS passphrase box on an encrypted machine. This
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# gives you a real render in seconds:
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#
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# * `unshare -rm` = user + mount namespace. We are root only in here, and
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# every mount below dies with the process.
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# * /run/plymouth is both the daemon's socket dir AND its compiled-in plugin
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# path (`strings plymouthd` → /run/plymouth/plugins/). So we bind a
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# writable dir over it and recreate its symlinks — miss those and plymouth
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# cannot find x11.so, silently skips X11, and goes looking for a tty.
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# * X11 is first in plymouth's renderer order (ply-renderer.c:283) and is
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# taken only while default_tty is unset — so never pass --tty. /dev/dri is
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# masked as well: a preview must not be able to mode-set the real outputs.
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# * PLY_CREATE_FAKE_MULTI_HEAD_SETUP (renderers/x11/plugin.c) fakes two heads
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# (800x600 + 640x480) — the multi-monitor case, on a single-monitor desk.
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#
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# Caveat: the fake heads are created up front, so this proves rendering and
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# centring, NOT #137's canvas-change bug (a head arriving mid-splash).
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set -u
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THEME="${1:-}"
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PLY=$(nix build --no-link --print-out-paths nixpkgs#plymouth 2>/dev/null | head -1)
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[ -n "$PLY" ] || { echo "could not build plymouth" >&2; exit 1; }
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[ -n "${DISPLAY:-}" ] || { echo "no DISPLAY — the x11 renderer needs Xwayland" >&2; exit 1; }
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export PLY THEME
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unshare -rm -- bash -euc '
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rm -rf /tmp/plyrig; mkdir -p /tmp/plyrig/run /tmp/plyrig/dri /tmp/plyrig/themes
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if [ -n "$THEME" ]; then
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cp -rL "$THEME/share/plymouth/themes/nomarchy" /tmp/plyrig/themes/
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# The .plymouth bakes absolute store paths at build time; point them at the
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# copy so the script here is the one that renders (edit + rerun = seconds).
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sed -i "s|^ScriptFile=.*|ScriptFile=/tmp/plyrig/themes/nomarchy/nomarchy.script|;
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s|^ImageDir=.*|ImageDir=/tmp/plyrig/themes/nomarchy|" \
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/tmp/plyrig/themes/nomarchy/nomarchy.plymouth
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ln -s /tmp/plyrig/themes /tmp/plyrig/run/themes
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else
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ln -s /etc/plymouth/themes /tmp/plyrig/run/themes
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fi
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ln -s /etc/plymouth/plugins /tmp/plyrig/run/plugins
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ln -s /etc/plymouth/plymouthd.defaults /tmp/plyrig/run/plymouthd.defaults
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mount --bind /tmp/plyrig/run /run/plymouth
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mount --bind /tmp/plyrig/dri /dev/dri 2>/dev/null || true
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export PLY_CREATE_FAKE_MULTI_HEAD_SETUP=1
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"$PLY/sbin/plymouthd" --no-daemon --mode=boot --no-boot-log \
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--kernel-command-line="plymouth.debug=stream:/tmp/plyrig/dbg.log splash" \
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>/dev/null 2>&1 &
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d=$!
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sleep 2
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"$PLY/bin/plymouth" show-splash >/dev/null 2>&1
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echo "splash up — two windows (800x600, 640x480). Ctrl+C or wait 20s."
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sleep 8
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"$PLY/bin/plymouth" ask-for-password --prompt="Unlock" --number-of-tries=1 >/dev/null 2>&1 &
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echo "password dialog requested (the LUKS path)"
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sleep 10
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"$PLY/bin/plymouth" quit >/dev/null 2>&1; sleep 1; kill $d 2>/dev/null
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cp /tmp/plyrig/dbg.log /tmp/plymouth-preview.log 2>/dev/null
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echo "log: /tmp/plymouth-preview.log"
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'
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