Catcrafts/fingerprintd
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An agent, so a finger can mean something in your session

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The daemon announces every matched finger on the system bus and stops there,
because root has no session bus, no display and no business starting your
applications. fingerprintd-agent is the other half: it runs as you, subscribes
properly rather than parsing gdbus monitor output, filters by uid because the
signal is visible to every local user, and maps fingers to commands from a file
you own and can edit without restarting anything.

It is a separate binary and a separate subpackage because it is a separate
trust domain. /etc/fingerprintd/actions.conf is a root shell and is guarded
like one; ~/.config/fingerprintd/fingers.conf runs your commands as you, so it
is an ordinary dotfile.

Demonstrated on the phone: one press of the unlock finger both unlocks it and
opens plasma-camera.
This commit is contained in:
Jorijn van der Graaf 2026-09-05 06:21:53 +02:00
commit 1934822554
8 changed files with 264 additions and 2 deletions
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21
packaging/APKBUILD
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@ -47,7 +47,7 @@ provides="fprintd=$pkgver-r$pkgrel"
# system that has systemd. No OpenRC service: nothing here has ever been run
# under one, and the unit's conditions (the vendor blob, /dev/tee0) are what
# keep the package inert on a phone that cannot use it.
subpackages="$pkgname-systemd"
subpackages="$pkgname-agent $pkgname-systemd"
# nothing is compiled here, and the aarch64 ELF's NEEDED entries must not be
# traced against an x86_64 build host
options="!check !tracedeps"
@ -114,6 +114,25 @@ package() {
# feature is off until an administrator installs one.
install -Dm644 actions.conf.example \
"$pkgdir"/usr/share/doc/$pkgname/actions.conf.example
# The session half; split out below.
install -Dm755 fingerprintd-agent "$pkgdir"/usr/bin/fingerprintd-agent
install -Dm644 fingerprintd-agent.service \
"$pkgdir"/usr/lib/systemd/user/fingerprintd-agent.service
install -Dm644 fingers.conf.example \
"$pkgdir"/usr/share/doc/$pkgname/fingers.conf.example
}
agent() {
pkgdesc="Run things in your session when a fingerprint matches"
# Useful only against a daemon that emits the signal, but it is a
# SEPARATE package because it is a separate trust domain: it runs as the
# user, reads a config the user owns, and starts the user's software.
depends="$pkgname=$pkgver-r$pkgrel"
amove usr/bin/fingerprintd-agent
amove usr/lib/systemd/user/fingerprintd-agent.service
amove usr/share/doc/$pkgname/fingers.conf.example
}
systemd() {