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libink: a brokerless D-Bus implementation for Finit

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Finit had no way to answer the question every service manager gets
asked: what is running, and change it.  D-Bus is how the rest of
userspace asks, but linking libdbus, sd-bus or GIO into PID 1 buys a
dependency, an allocator and a main loop we do not control.

So libink: the wire format, an object tree, and a bus of Finit's own
at /run/finit/bus, gated like INIT_SOCKET.  It speaks the standard
org.freedesktop.DBus, .Peer, .Introspectable interfaces, and Finit's
own Manager1, Service1 and Cond1 on top.  Methods that change
something are marked privileged and answered only for a caller the
kernel vouched for, via SO_PEERCRED.

Server and client both, since initctl is the first thing that needs
to talk to it, and its Start/Stop/Restart/Reload now go over the bus
rather than the legacy socket.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg
2026-08-13 09:28:14 +02:00
parent ae9a24f44f
commit 0a269f3298
39 changed files with 5530 additions and 49 deletions
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test/setup-sysroot.sh
+14 -1
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@@ -15,9 +15,22 @@ make -C "$top_builddir" DESTDIR="$SYSROOT" install
mkdir -p "$SYSROOT/sbin/"
cp "$top_builddir/test/src/serv" "$SYSROOT/sbin/"
if [ -x "$top_builddir/test/src/dbus-auth-client" ]; then
cp "$top_builddir/test/src/dbus-auth-client" "$SYSROOT/sbin/"
fi
# shellcheck disable=SC2154
FINITBIN="$(pwd)/$top_builddir/src/finit" DEST="$SYSROOT" make -f "$srcdir/lib/sysroot.mk"
# Prefer the real ELF in .libs/ over the libtool wrapper script at
# $top_builddir/src/finit. Libtool generates a shell wrapper when
# the binary depends on an in-tree convenience library (e.g. libink),
# and `ldd <wrapper>` returns "not a dynamic executable", which
# silently makes sysroot.mk copy zero host libs into the sysroot.
if [ -f "$top_builddir/src/.libs/finit" ]; then
finitbin_for_ldd="$(pwd)/$top_builddir/src/.libs/finit"
else
finitbin_for_ldd="$(pwd)/$top_builddir/src/finit"
fi
FINITBIN="$finitbin_for_ldd" DEST="$SYSROOT" make -f "$srcdir/lib/sysroot.mk"
# Drop plugins we don't need in test, only causes confusing FAIL in logs.
for plugin in tty.so urandom.so rtc.so modprobe.so; do