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Subject: bug#52654: shepherd lacks error reporting
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Date: Sun, 19 Dec 2021 06:13:20 +0100
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--MP_//hLSyACD9UjpTbu5+gMnxFf
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I'm writing a single-shot shepherd-service that expands the (ext4) root
file system on first boot, using the hostname service as a template,
just passing the script as a G-expression, instead of using the
forkexec constructor.
Of course there is a bug in it. Trouble is, I have no idea what it is,
because Shepherd won't tell me. :)
The VM boots and completes the ssh initialization phase and then
apparently just gets stuck. Doesn't even show a login prompt.
It's... not a great debugging experience.
I'm going to attempt to at the very least add some error reporting.
It would also be really nice if the failure modes for Shepherd services
were better documented, like what happens when the procedure passed in
the `start` field fails, or is not even a procedure, etc.
Since I never touched Shepherd internals, help would be greatly
appreciated.
ps.: I'm attaching the system definition for completeness's sake and so
that someone might point out where the error is, but honestly the exact
bug in my code does not matter for the feature. All that matters is
there is an error and it should be logged but isn't.
--MP_//hLSyACD9UjpTbu5+gMnxFf
Content-Type: text/x-scheme
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment; filename=cloud-deploy-bootstrap.scm
(define-module (raingloom machines cloud-deploy-bootstrap))
(use-modules
(gnu)
(gnu system nss)
(guix channels)
(guix modules))
(use-service-modules
admin
networking
shepherd
ssh)
(use-package-modules
admin
bootloaders
certs
gnome
linux
networking
ssh
tmux
tls
version-control)
(define disk "/dev/vda")
(define partition "2")
(define ext-autoexpand-service-type
(let
((name 'ext-autoexpand)
(desc
"Automatically expand ext2 root")
(modules
'((ice-9 popen))))
(shepherd-service-type
name
(lambda (config)
(shepherd-service
(documentation desc)
(provision (list name))
(requirement '(file-systems))
(one-shot? #t)
(start
(with-imported-modules
(source-module-closure modules)
#~(begin
(use-modules #$@modules)
(let ((port
(open-pipe*
OPEN_WRITE
#$(file-append util-linux "/sbin/sfdisk")
;; don't check if the block is in use
;; it is, and we don't care.
"--no-reread"
disk
"-N" partition)))
(display ",+" port)
(close-port port))
(system* $#(file-append util-linux "/sbin/partx") "--update" disk)
(system*
#$(file-append e2fsprogs "/sbin/resize2fs")
(string-append disk partition)))))))
(description desc))))
(define-public %system
(operating-system
(host-name "cloud-deploy-bootstrap")
(timezone "Europe/Budapest")
(locale "en_US.utf8")
(keyboard-layout (keyboard-layout "us"))
(bootloader (bootloader-configuration
(bootloader grub-bootloader)
(targets '("/dev/vda"))
(keyboard-layout keyboard-layout)))
(file-systems (append
(list (file-system
(device (file-system-label "cloudimg-rootfs"))
(mount-point "/")
(type "btrfs")))
%base-file-systems))
;; This is where we specify system-wide packages.
(packages (append (list
nss-certs
tmux)
%base-packages))
(services
(append
(list
(service ext-autoexpand-service-type #f)
(service dhcp-client-service-type)
(service openssh-service-type
(openssh-configuration
(openssh openssh-sans-x)
(permit-root-login #t)
(authorized-keys
`(("root" ,(local-file (string-append (getenv "HOME") "/.ssh/id_ed25519.pub"))))))))
%base-services))
;; Allow resolution of '.local' host names with mDNS.
(name-service-switch %mdns-host-lookup-nss)))
%system
--MP_//hLSyACD9UjpTbu5+gMnxFf--
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Subject: bug#52654: shepherd lacks error reporting
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On Sun, 19 Dec 2021 06:13:20 +0100
raingloom <raingloom@HIDDEN> wrote:
> I'm writing a single-shot shepherd-service that expands the (ext4)
> root file system on first boot, using the hostname service as a
> template, just passing the script as a G-expression, instead of using
> the forkexec constructor.
> Of course there is a bug in it. Trouble is, I have no idea what it is,
> because Shepherd won't tell me. :)
> The VM boots and completes the ssh initialization phase and then
> apparently just gets stuck. Doesn't even show a login prompt.
> It's... not a great debugging experience.
> I'm going to attempt to at the very least add some error reporting.
> It would also be really nice if the failure modes for Shepherd
> services were better documented, like what happens when the procedure
> passed in the `start` field fails, or is not even a procedure, etc.
> Since I never touched Shepherd internals, help would be greatly
> appreciated.
>
> ps.: I'm attaching the system definition for completeness's sake and
> so that someone might point out where the error is, but honestly the
> exact bug in my code does not matter for the feature. All that
> matters is there is an error and it should be logged but isn't.
So the error in my config turned out to be the G-expression not
evaluating to a lambda, but the issue with Shepherd still stands.
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Subject: bug#52654: shepherd lacks error reporting
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From: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
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<20211219070207.1195510c@HIDDEN>
Date: Sat, 29 Apr 2023 11:22:27 -0400
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Hi,
I also encountered that issue, it's really puzzling.
Here's the problematic start slot that got my mpd test to hang the boot,
with the last message being "Please wait while gathering entropy to
generate the key pair;":
--8<---------------cut here---------------start------------->8---
(start
(with-imported-modules (source-module-closure
'((gnu build activation)))
#~(begin
(use-modules (gnu build activation))
(let ((user (getpw #$username)))
(define (init-directory directory)
(unless (file-exists? directory)
(mkdir-p/perms directory user #o755)))
(for-each
init-directory
(cons '#$(map dirname
;; XXX: Delete the potential "syslog"
;; log-file value, which is not a directory.
(delete "syslog"
(filter-map maybe-value
(list db-file
log-file
state-file
sticker-file)))))))
(make-forkexec-constructor
(list #$(file-append package "/bin/mpd") "--no-daemon"
#$config-file)
#:environment-variables '#$environment-variables))))
--8<---------------cut here---------------end--------------->8---
The error was the lonely cons. Taking it out, the test then passed:
--8<---------------cut here---------------start------------->8---
(start
(with-imported-modules (source-module-closure
'((gnu build activation)))
#~(begin
(use-modules (gnu build activation))
(let ((user (getpw #$username)))
(define (init-directory directory)
(unless (file-exists? directory)
(mkdir-p/perms directory user #o755)))
(for-each
init-directory
'#$(map dirname
;; XXX: Delete the potential "syslog"
;; log-file value, which is not a directory.
(delete "syslog"
(filter-map maybe-value
(list db-file
log-file
state-file
sticker-file))))))
(make-forkexec-constructor
(list #$(file-append package "/bin/mpd") "--no-daemon"
#$config-file)
#:environment-variables '#$environment-variables))))
--8<---------------cut here---------------end--------------->8---
Shepherd should report the error, fail that one service and attempt to
keep booting (if the service is not required by other critical ones).
--
Thanks,
Maxim
GNU bug tracking system
Copyright (C) 1999 Darren O. Benham,
1997 nCipher Corporation Ltd,
1994-97 Ian Jackson.