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brendlefly62
Apprentice
Joined: 19 Dec 2009
Posts: 153
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 Posted: Wed Jan 08, 2025 3:06 pm Post subject: Unable to find udev executable - but it is there and linked |
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Bottom line up front: links to /bin/udevadm are present in /lib/systemd/ and /usr/lib/systemd/ but they don't test as executable the way /etc/init.d/udev is looking at them -- so I had to manually add a link to udevadm in /sbin as a workaround. Is this a known bug? not a bug? Anyone else encounter this and fix it a different way?
I converted a well-running, frequently updated 10 yr old core i7-3537U system from ACCEPT_KEYWORDS="~amd64" to ACCEPT_KEYWORDS="amd64" and ran a global update with several downgrades. After rebooting, my user account got error messages about not having permission to /dev/null -- indicating a possible udev problem.
rc-status indicated the udev service was in the sysinit runlevel, but it was "stopped," as was udev-trigger. I tried to restart udev with | Code: | # /etc/init.d/udev start
Unable to find udev executable.
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Examining the content of /etc/init.d/udev, I noted that this output comes from this function
| Code: | get_udevd_binary() {
local bins
bins="/sbin/udevd /lib/systemd/systemd-udevd /usr/lib/systemd/systemd-udevd"
for f in ${bins}; do
if [ -x "$f" ]; then
command="$f"
fi
done
if [ -z "$command" ]; then
eerror "Unable to find udev executable."
return 1
fi
}
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I inspected the associated directories of these "$bins" and found links in the systemd directories --
| Code: | for f in ${bins}; do echo "----[ $f ]----"; ls -al $(dirname $f)/ | grep $(basename $f); done
----[ /sbin/udevd ]----
----[ /lib/systemd/systemd-udevd ]----
lrwxrwxrwx 1 root root 17 Dec 2 20:30 systemd-udevd -> ../../bin/udevadm
----[ /usr/lib/systemd/systemd-udevd ]----
lrwxrwxrwx 1 root root 17 Dec 2 20:30 systemd-udevd -> ../../bin/udevadm |
I ran this same test as the init.d script, but manually, and Igot these results
| Code: | for f in ${bins}; do if [ -x "$f" ]; then echo true; else echo false; fi; done
false
false
false |
I googled and looked in gentoo bugs and forums, and I found this reference --
https://forums.gentoo.org/viewtopic-t-1145996-start-0.html
At first I thought it did not apply to me, because the thread of comments indicates this user's problem stemmed from having systemd in an INSTALL_MASK -- but I do not. Nonetheless, I tried adding a link in /sbin and re-running the test -
| Code: | # cd /sbin/
# ln -s /bin/udevadm udevd
# for f in ${bins}; do if [ -x "$f" ]; then echo true; else echo false; fi; done
true
false
false
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I rebooted, and everything seems fine.
My question is whether this is a bug -- the systemd links do not evaluate true when tested with [ -x
or whether something about my system's history put me in an unusual situation - any advice? |
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Hu
Administrator
Joined: 06 Mar 2007
Posts: 22960
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| Posted: Wed Jan 08, 2025 3:56 pm Post subject: |
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The test seems to do the right thing here on an openrc no-merged-usr system. | Code: | $ bins="/sbin/udevd /lib/systemd/systemd-udevd /usr/lib/systemd/systemd-udevd"
$ for f in ${bins}; do
if [ -x "$f" ]; then echo true; else echo false; fi; done
false
true
false
$ namei -l $bins
f: /sbin/udevd
drwxr-xr-x root root /
drwxr-xr-x root root sbin
udevd - No such file or directory
f: /lib/systemd/systemd-udevd
drwxr-xr-x root root /
drwxr-xr-x root root lib
drwxr-xr-x root root systemd
lrwxrwxrwx root root systemd-udevd -> ../../bin/udevadm
drwxr-xr-x root root ..
drwxr-xr-x root root ..
drwxr-xr-x root root bin
-rwxr-xr-x root root udevadm
f: /usr/lib/systemd/systemd-udevd
drwxr-xr-x root root /
drwxr-xr-x root root usr
drwxr-xr-x root root lib
drwxr-xr-x root root systemd
systemd-udevd - No such file or directory |
I think the udevd name is older. udevadm is the name that systemd-udevd prefers now. I think the links ought to evaluate as true for [ -x ] when the target exists and is executable. They do for me. They clearly did not for you. How does your namei -l output compare to mine? Are you on split-usr or merged-usr? |
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bstaletic
Guru
Joined: 05 Apr 2014
Posts: 452
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| Posted: Wed Jan 08, 2025 4:37 pm Post subject: |
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| brendlefly62 wrote: | | I ran this same test as the init.d script, but manually, and Igot these results |
Init scripts use openrc-run as the interpreter. I have a feeling you're not using that or bash as your interactive shell.
For me, the test works in bash, but not in zsh. |
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brendlefly62
Apprentice
Joined: 19 Dec 2009
Posts: 153
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| Posted: Wed Jan 08, 2025 6:06 pm Post subject: |
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Thanks Hu, bstaletic, my initial instinct was that the "reversion" from ~adm64 to amd64 and associated downgrades and subsequent emerge --depclean removed something... now, more specifically, I think the problem is that the systemd links in the /etc/init.d/udev script point to /usr/bin whereas the executable udevadm is actually in /bin -- not important on my newer merged-usr systems, but important on the layout of this older system ... so is this a bug in the init.d/udev script then? or do I have the wrong layout for /lib/systemd because I need to add an explicit "split-usr" USE flag somewhere? (see my note about USE at the bottom of this current post)
bstaletic:
| Quote: | | Init scripts use openrc-run as the interpreter. I have a feeling you're not using that or bash as your interactive shell. |
I'm running bash -
| Code: | echo "shell: $SHELL" && echo "shell process:" && ps -p $$
shell: /bin/bash
shell process:
PID TTY TIME CMD
4490 pts/0 00:00:00 bash
# for f in ${bins}; do echo "----[ $f ]----"; ls -al $(dirname $f) | grep $(basename $f); if [ -x "$f" ]; then echo true; else echo false; fi; done
----[ /sbin/udevd ]----
lrwxrwxrwx 1 root root 12 Jan 8 08:50 udevd -> /bin/udevadm
true
----[ /lib/systemd/systemd-udevd ]----
false
----[ /usr/lib/systemd/systemd-udevd ]----
lrwxrwxrwx 1 root root 17 Dec 2 20:30 systemd-udevd -> ../../bin/udevadm
false
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Hu:
Here's my name -l output --
| Code: | # namei -l $bins
f: /sbin/udevd
drwxr-xr-x root root /
drwxr-xr-x root root sbin
lrwxrwxrwx root root udevd -> /bin/udevadm
drwxr-xr-x root root /
drwxr-xr-x root root bin
-rwxr-xr-x root root udevadm
f: /lib/systemd/systemd-udevd
drwxr-xr-x root root /
drwxr-xr-x root root lib
lrwxrwxrwx root root systemd -> ../usr/lib/systemd
drwxr-xr-x root root ..
drwxr-xr-x root root usr
drwxr-xr-x root root lib
drwxr-xr-x root root systemd
lrwxrwxrwx root root systemd-udevd -> ../../bin/udevadm
drwxr-xr-x root root ..
drwxr-xr-x root root ..
drwxr-xr-x root root bin
udevadm - No such file or directory
f: /usr/lib/systemd/systemd-udevd
drwxr-xr-x root root /
drwxr-xr-x root root usr
drwxr-xr-x root root lib
drwxr-xr-x root root systemd
lrwxrwxrwx root root systemd-udevd -> ../../bin/udevadm
drwxr-xr-x root root ..
drwxr-xr-x root root ..
drwxr-xr-x root root bin
udevadm - No such file or directory |
I note that name -l thinks the target ( ../../bin/udevadm ) does not exist, but it does (as the output of name -l demonstrates for the /sbin/udevd link that I created)
I also note that, on this system, /lib/systemd is a link to ../usr/lib/systemd (so it doesn't help a non-merged-system find the executable in /bin)
| Code: | # tree -d -L 2 /lib
/lib
|-- dhcpcd
| `-- dhcpcd-hooks
...
|-- sysctl.d
|-- systemd -> ../usr/lib/systemd
`-- udev -> ../usr/lib/udev
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but /usr/lib/systemd is not --
# tree -d -L 2 /usr/lib
/usr/lib
| Code: | |-- audit
|-- clang
| `-- 18
|-- cmake
| `-- nghttp3
...
|-- systemd
| |-- network
| |-- ntp-units.d
| |-- system
| `-- user
...
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This shows me the link in /usr/lib/systemd, but it is in blinking, indicating the target is not on the system --
| Code: | # ls -al /usr/lib/systemd/
total 24
drwxr-xr-x 6 root root 4096 Jan 8 08:30 .
drwxr-xr-x 34 root root 4096 Jan 7 20:56 ..
drwxr-xr-x 2 root root 4096 Dec 26 17:57 network
drwxr-xr-x 2 root root 4096 Mar 8 2024 ntp-units.d
drwxr-xr-x 2 root root 4096 Jan 7 22:00 system
lrwxrwxrwx 1 root root 17 Dec 2 20:30 systemd-udevd -> ../../bin/udevadm <--- this line blinkig white text on red background
drwxr-xr-x 2 root root 4096 Jun 5 2023 user |
When I try to follow the link, I find it takes me to /usr/bin, not to /usr where the udevadm executable is actually located
| Code: | # cd /usr/lib/systemd/
# cd ../../bin/
# pwd
/usr/bin
# which udevadm
/bin/udevadm |
When I examine another non-merged-usr system, that was stable (keyword amd64) from the start, I don't have that problem --
| Code: | # for f in ${bins}; do echo "----[ $f ]----"; ls -al $(dirname $f) | grep $(basename $f); if [ -x "$f" ]; then echo true; else echo false; fi; done
----[ /sbin/udevd ]----
false
----[ /lib/systemd/systemd-udevd ]----
lrwxrwxrwx 1 root root 17 Dec 2 17:33 systemd-udevd -> ../../bin/udevadm
true
----[ /usr/lib/systemd/systemd-udevd ]----
false
# cd /lib/systemd
# cd ../../bin
# pwd
/bin |
I notice these packages support a split-usr USE flag
| Code: | # equery h split-usr
* Searching for USE flag split-usr ...
[IP-] [ ] app-alternatives/awk-4:0
[IP-] [ ] app-alternatives/bzip2-1:0
[IP-] [ ] app-alternatives/cpio-0:0
[IP-] [ ] app-alternatives/gzip-1:0
[IP-] [ ] app-alternatives/tar-0:0
[IP-] [ ] dev-libs/lzo-2.10:2
[IP-] [ ] sys-apps/baselayout-2.17:0
[IP-] [ ] sys-apps/coreutils-9.5:0
[IP-] [ ] sys-apps/shadow-4.14.8:0/4
[IP-] [ ] sys-apps/systemd-utils-254.17:0
[IP-] [ ] sys-libs/ncurses-6.4_p20240414:0/6 |
I'm wondering if my "reversion" went astray because I don't have that USE flag set, anywhere. Sould I set it for one or more of these packages, or maybe globally? is it safe to do that? |
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bstaletic
Guru
Joined: 05 Apr 2014
Posts: 452
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| Posted: Wed Jan 08, 2025 7:25 pm Post subject: |
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| Quote: | | I'm wondering if my "reversion" went astray because I don't have that USE flag set, anywhere. Sould I set it for one or more of these packages, or maybe globally? is it safe to do that? |
Definitely do not touch the split-usr flag. It is set and enforced by your profile.
| Quote: | | I note that name -l thinks the target ( ../../bin/udevadm ) does not exist, but it does (as the output of name -l demonstrates for the /sbin/udevd link that I created) |
../../bin/udevadm is relative to /usr/lib/systemd/systemd-udevd, so the target is at /usr/bin/udevadm. |
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Hu
Administrator
Joined: 06 Mar 2007
Posts: 22960
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| Posted: Wed Jan 08, 2025 7:37 pm Post subject: |
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| What is the output of emerge --info; emerge --pretend --verbose /bin/udevadm? I suspect you somehow installed a merged-usr package onto a split-usr system. This shouldn't be possible by default, and can cause problems if you manage to do it. |
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grknight
Retired Dev
Joined: 20 Feb 2015
Posts: 1976
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| Posted: Wed Jan 08, 2025 7:38 pm Post subject: |
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| I would be curious to see the output of ls -ld /bin /usr/bin |
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brendlefly62
Apprentice
Joined: 19 Dec 2009
Posts: 153
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| Posted: Wed Jan 08, 2025 11:36 pm Post subject: |
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Thanks, Hu, grknight. Here is the info you requested (some via wgetpaste) --
Hu:
emerge --info --> https://bpa.st/6RYA
emerge --pretend --verbose /bin/udevadm --> https://bpa.st/O23Q
| Code: | $ emerge --pretend --verbose /bin/udevadm
Local copy of remote index is up-to-date and will be used.
Local copy of remote index is up-to-date and will be used.
Local copy of remote index is up-to-date and will be used.
These are the packages that would be merged, in order:
Calculating dependencies ... done!
Dependency resolution took 4.18 s (backtrack: 0/20).
[binary R ] sys-apps/systemd-utils-254.17::gentoo USE="kmod (split-usr) tmpfiles udev -acl -boot -kernel-install -secureboot (-selinux) -sysusers -test -ukify" ABI_X86="(64) -32 (-x32)" PYTHON_SINGLE_TARGET="python3_12 -python3_10 -python3_11" 0 KiB
Total: 1 package (1 reinstall, 1 binary), Size of downloads: 0 KiB |
(note: I have several -march=ivybridge systems which serve as binhost for each other)
to get a non-binary-package ...
FEATURES=" -getbinpkg -distcc" emerge --pretend --verbose /bin/udevadm --> https://bpa.st/PKPQ
| Code: | $ FEATURES=" -getbinpkg -distcc" emerge --pretend --verbose /bin/udevadm
These are the packages that would be merged, in order:
Calculating dependencies ... done!
Dependency resolution took 4.65 s (backtrack: 0/20).
[ebuild R ] sys-apps/systemd-utils-254.17::gentoo USE="kmod (split-usr) tmpfiles udev -acl -boot -kernel-install -secureboot (-selinux) -sysusers -test -ukify" ABI_X86="(64) -32 (-x32)" PYTHON_SINGLE_TARGET="python3_12 -python3_10 -python3_11" 14,226 KiB
Total: 1 package (1 reinstall), Size of downloads: 14,226 KiB
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in either case, it wants to emerge systemd-utils (and I note that it picks the split-usr USE flag with parentheses, which I think means it is forced ty my profile, which by the way is
| Code: | $ eselect profile list | grep '\*$'
[58] default/linux/amd64/23.0/split-usr/hardened (stable) * |
I didn't change that in my "reversion" - I just changed ACCEPT_KEYWORDS in my make.conf
grknight: Here is the ls -ld --
| Code: | # ls -ld /bin /usr/bin
drwxr-xr-x 2 root root 4096 Jan 7 21:07 /bin
drwxr-xr-x 2 root root 106496 Jan 8 17:50 /usr/bin |
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Installing Gentoo
