`libinput analyze touch-down-state /tmp/touchpad.yml` crashes with missing Python module libevdev. `emerge -1 dev-python/libevdev` lets `libinput analyze` continue execution. I'll leave it to the maintainer to decide whether this is an easy missing dependency or a USE flag has to be added to libinput. Reproducible: Always Steps to Reproduce: Run libinput analyze touch-down-state /tmp/touchpad.yml Actual Results: Crashed due to missing Python module libevdev Expected Results: `libinput analyze` analyses the yml file and outputs a nice table that counts your fingers in the touchpad; how cool is that Portage 3.0.66.1 (python 3.12.8-final-0, default/linux/amd64/23.0/desktop, gcc-14, glibc-2.40-r5, 6.6.67-gentoo x86_64) ================================================================= System uname: Linux-6.6.67-gentoo-x86_64-Intel-R-_Core-TM-_i5-10210U_CPU_@_1.60GHz-with-glibc2.40 KiB Mem: 16051896 total, 2879376 free KiB Swap: 16759804 total, 12746424 free Timestamp of repository gentoo: Fri, 03 Jan 2025 10:30:00 +0000 Head commit of repository gentoo: bf9dd4cb95f103a37a6c49b3cba8f5bfe8658b88 Timestamp of repository brother-overlay: Tue, 17 Dec 2024 22:21:09 +0000 Head commit of repository brother-overlay: bea1e02298146559c0c3bde06de4d0f2528442f3 Head commit of repository gg-overlay: dc5b21d4b409 Timestamp of repository php-overlay: Tue, 31 Dec 2024 16:03:18 +0000 Head commit of repository php-overlay: e2db660797cff76b5299c74156d0cbd9389633f1 sh bash 5.2_p37 ld GNU ld (Gentoo 2.43 p3) 2.43.1 app-misc/pax-utils: 1.3.8::gentoo app-shells/bash: 5.2_p37::gentoo dev-build/autoconf: 2.13-r8::gentoo, 2.71-r7::gentoo, 2.72-r1::gentoo dev-build/automake: 1.16.5-r2::gentoo dev-build/cmake: 3.30.6::gentoo dev-build/libtool: 2.4.7-r4::gentoo dev-build/make: 4.4.1-r100::gentoo dev-build/meson: 1.6.1::gentoo dev-java/java-config: 2.3.4::gentoo dev-lang/perl: 5.40.0::gentoo dev-lang/python: 3.12.8::gentoo, 3.13.1::gentoo dev-lang/rust: 1.82.0-r101::gentoo llvm-core/clang: 18.1.8-r6::gentoo, 19.1.4::gentoo llvm-core/lld: 19.1.4::gentoo llvm-core/llvm: 18.1.8-r6::gentoo, 19.1.4::gentoo sys-apps/baselayout: 2.17::gentoo sys-apps/openrc: 0.55.1::gentoo sys-apps/sandbox: 2.39::gentoo sys-devel/binutils: 2.43-r2::gentoo sys-devel/binutils-config: 5.5.2::gentoo sys-devel/gcc: 14.2.1_p20241221::gentoo sys-devel/gcc-config: 2.11::gentoo sys-kernel/linux-headers: 6.6-r1::gentoo (virtual/os-headers) sys-libs/glibc: 2.40-r5::gentoo Repositories: gentoo location: /var/db/repos/gentoo sync-type: rsync sync-uri: rsync://nana.gagv.org.uk/gentoo-portage priority: -1000 volatile: False sync-rsync-verify-metamanifest: yes sync-rsync-verify-max-age: 3 sync-rsync-extra-opts: sync-rsync-verify-jobs: 1 brother-overlay location: /var/db/repos/brother-overlay sync-type: git sync-uri: https://github.com/gentoo-mirror/brother-overlay.git masters: gentoo volatile: False gg-overlay location: /var/db/repos/gg-overlay sync-type: mercurial sync-uri: https://www.gagv.org.uk/hg/gg-overlay masters: gentoo volatile: False php-overlay location: /var/db/repos/php-overlay sync-type: git sync-uri: https://github.com/gentoo-mirror/php-overlay.git masters: gentoo volatile: False ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="*" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-march=native -O3 -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/lib64/libreoffice/program/sofficerc /usr/share/config /usr/share/easy-rsa /usr/share/gnupg/qualified.txt /var/bind" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d" CXXFLAGS="-march=native -O3 -pipe" DISTDIR="/var/cache/distfiles" EMERGE_DEFAULT_OPTS="--jobs 100" ENV_UNSET="CARGO_HOME DBUS_SESSION_BUS_ADDRESS DISPLAY GDK_PIXBUF_MODULE_FILE GOBIN GOPATH PERL5LIB PERL5OPT PERLPREFIX PERL_CORE PERL_MB_OPT PERL_MM_OPT XAUTHORITY XDG_CACHE_HOME XDG_CONFIG_HOME XDG_DATA_HOME XDG_RUNTIME_DIR XDG_STATE_HOME" FCFLAGS="-march=native -O3 -pipe" FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs buildpkg-live config-protect-if-modified distlocks ebuild-locks fixlafiles ipc-sandbox merge-wait multilib-strict network-sandbox news parallel-fetch pid-sandbox pkgdir-index-trusted preserve-libs protect-owned 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pcsc-lite pdf pipewire png policykit ppds pulseaudio qml qt5 qt6 quicktime readline screencast sdl seccomp sound spell ssl startup-notification svg synaptics test-rust thunderbolt tiff tpm truetype udev udisks uefi unicode upower usb v4l vaapi vdpau vorbis vulkan wayland webp wxwidgets x264 x265 xattr xcb xft xml xv xvid zeroconf zlib zstd" ABI_X86="64" ADA_TARGET="gcc_13" ALSA_CARDS="maestro3 hdspm ymfpci" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_anon authn_dbm authn_file authz_dbm authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir env expires ext_filter file_cache filter headers include info log_config logio mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="karbon sheets words" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="mmx mmxext sse sse2 aes avx avx2 f16c fma3 pclmul popcnt rdrand sse3 sse4_1 sse4_2 ssse3" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock greis isync itrax navcom oceanserver oncore rtcm104v2 rtcm104v3 sirf skytraq superstar2 tsip tripmate tnt ublox" GUILE_SINGLE_TARGET="3-0" GUILE_TARGETS="3-0" INPUT_DEVICES="libinput" KERNEL="linux" L10N="en en-GB" LCD_DEVICES="bayrad cfontz glk hd44780 lb216 lcdm001 mtxorb text" LUA_SINGLE_TARGET="lua5-1" LUA_TARGETS="lua5-1" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php8-2" POSTGRES_TARGETS="postgres16" PYTHON_SINGLE_TARGET="python3_12" PYTHON_TARGETS="python3_12" RUBY_TARGETS="ruby32" SANE_BACKENDS="net" VIDEO_CARDS="fbdev intel vesa dummy" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipp2p iface geoip fuzzy condition tarpit sysrq proto logmark ipmark dhcpmac delude chaos account" Unset: ADDR2LINE, AR, ARFLAGS, AS, ASFLAGS, CC, CCLD, CONFIG_SHELL, CPP, CPPFLAGS, CTARGET, CXX, CXXFILT, ELFEDIT, EXTRA_ECONF, F77FLAGS, FC, GCOV, 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We have an `optfeature` message for this in the libinput ebuilds already: pkg_postinst() { optfeature "measure and replay tools" dev-python/libevdev udev_reload } Looks like that dates to this commit (in a slightly different form). commit 0b5616c3dedc857001d0b42e579c6599cf713f43 Author: Matt Turner <mattst88@gentoo.org> Date: Sun Mar 8 19:03:34 2020 -0700 dev-libs/libinput: Inform users about dev-python/python-libevdev I don't think a runtime dependency is warranted for these two tools, so let's just inform users about the dependency. Closes: https://bugs.gentoo.org/703800 Signed-off-by: Matt Turner <mattst88@gentoo.org> I'm unsure that we should convert this to an RDEPEND.
Thanks for looking into this, Matt. Like I said, this is up to you - what I'm reporting is that you do get a runtime error if you don't install libevdev; I had completely forgotten about any message that Portage displayed, mainly because libinput gets pulled as a dependency of something else and you end up using it as a troubleshooting tool a long time after your brain has forgotten Portage's message. (I'm using the Royal "you" here, meaning me, so this is probably just me). Happy for you to close if you believe that this is excessive as a runtime dependency or a USE flag; it feels, however, that some other users may struggle if they end up encountering the same error. Then again, this is easily explained in Gentoo Support IRC by pretty much anybody. FWIW, I found libinput's recording+analysis useful to confirm that my touchpad can indeed do multi finger input, which is something that a tool like wev couldn't surface clearly enough.
