Your message dated Sun, 28 Feb 2021 18:15:17 +0000
with message-id <1614536117.679337.31438.nullmailer@???>
and subject line #527: fixed in src:eudev version 3.2.9-9
has caused the Devuan bug report #527,
regarding udev rule for btrfs is not built correctly (fwd)
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
bug report if necessary, and/or fix the problem forthwith.

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--
527: https://bugs.devuan.org/cgi/bugreport.cgi?bug=527
Devuan Bug Tracking System
Contact owner@??? with problems
Package: eudev
Version: 3.2.7-6

This bug has been described here; too:
https://bugs.gentoo.org/show_bug.cgi?id=739268

tl;dr:
messages saying "Aug 27 16:30:50 MiniHTPC2 udevd[2291]: failed to execute
'/usr/lib/udev/${exec_prefix}/bin/udevadm' '${exec_prefix}/bin/udevadm
trigger -s block -p ID_BTRFS_READY=0': No such file or directory" do
appear in dmesg log (similar on my system, except for the host name)
To fix, ${exec_prefix} needs to be set in the build scripts

I fixed it locally; until then, the config files were original.

Effective local patch:
--- /lib/udev/rules.d/64-btrfs.rules~   2019-02-09 13:22:24.000000000 +0100
+++ /lib/udev/rules.d/64-btrfs.rules    2020-11-16 15:02:07.720000000 +0100
@@ -11,6 +11,6 @@ IMPORT{builtin}="btrfs ready $devnode"
 ENV{ID_BTRFS_READY}=="0", ENV{SYSTEMD_READY}="0"

# reconsider pending devices in case when multidevice volume awaits
-ENV{ID_BTRFS_READY}=="1", RUN+="${exec_prefix}/bin/udevadm trigger -s block -p ID_BTRFS_READY=0"
+ENV{ID_BTRFS_READY}=="1", RUN+="/bin/udevadm trigger -s block -p ID_BTRFS_READY=0"

LABEL="btrfs_end"

Have a nice day; 
    Bodo Eggert

Version: 3.2.9-9

Source package eudev (3.2.9-9) added to Devuan suite unstable.

This closes bug report 527.

Thanks

DAK managing the Devuan archive

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Format: 1.8
Date: Fri, 26 Feb 2021 13:49:24 +0100
Source: eudev
Architecture: source
Version: 3.2.9-9
Distribution: unstable
Urgency: medium
Maintainer: Devuan Dev Team <devuan-dev@???>
Changed-By: Svante Signell <svante.signell@???>
Closes: 527 538 548
Changes:
 eudev (3.2.9-9) unstable; urgency=medium
 .
   * debian/rules: Add --bindir=/bin to CONFFLAGS to fix path in 64-btrfs.rules.
     Problem found upstream: https://bugs.gentoo.org/739268 (Closes: #527, #538)
   * debian/eudev.postinst: Fix postinst when input, kvm or render groups, with
     gid >= 1000 are present. Solution proposed by Bob Proulx <bob@???>
     (Closes: #548)
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