[systemd-devel] help with portable service

[Luca Boccassi]

On Mon, 3 Apr 2023 at 01:45, Chuck Tuffli <ctuffli at gmail.com> wrote:
>
> I'm experimenting with Portable Services, but the "walkthrough" example [1] doesn't seem to work. The error:
>   Failed to execute /usr/bin/portable-walkthrough-go: No such file or directory
> probably means something fairly fundamental is wrong, but I can't seem to figure out what that might be. Any suggestions?
>
> [1] http://0pointer.net/blog/walkthrough-for-portable-services-in-go.html
>
> # systemd --version
> systemd 249 (249.11-0ubuntu3.7pop1~1680050939~22.04~c5d2663)
> +PAM +AUDIT +SELINUX +APPARMOR +IMA +SMACK +SECCOMP +GCRYPT +GNUTLS +OPENSSL +ACL +BLKID +CURL +ELFUTILS +FIDO2 +IDN2 -IDN +IPTC +KMOD +LIBCRYPTSETUP +LIBFDISK +PCRE2 -PWQUALITY -P11KIT -QRENCODE +BZIP2 +LZ4 +XZ +
> ZLIB +ZSTD -XKBCOMMON +UTMP +SYSVINIT default-hierarchy=unified
> # uname -srvmpio
> Linux 6.2.6-76060206-generic #202303130630~1679424972~22.04~4a8cde1 SMP PREEMPT_DYNAMIC Tue M x86_64 x86_64 x86_64 GNU/Linux
> # portablectl attach ./portable-walkthrough-go.raw
> (Matching unit files with prefix 'portable-walkthrough-go'.)
> Created directory /etc/systemd/system.attached.
> Created directory /etc/systemd/system.attached/portable-walkthrough-go.service.d.
> Written /etc/systemd/system.attached/portable-walkthrough-go.service.d/20-portable.conf.
> Created symlink /etc/systemd/system.attached/portable-walkthrough-go.service.d/10-profile.conf → /usr/lib/systemd/portable/profile/default/service.conf.
> Copied /etc/systemd/system.attached/portable-walkthrough-go.service.
> Created directory /etc/systemd/system.attached/portable-walkthrough-go.socket.d.
> Written /etc/systemd/system.attached/portable-walkthrough-go.socket.d/20-portable.conf.
> Copied /etc/systemd/system.attached/portable-walkthrough-go.socket.
> Created symlink /etc/portables/portable-walkthrough-go.raw → /home/ctuffli/dev/portables/portable-walkthrough-go/portable-walkthrough-go.raw.
> # systemctl start portable-walkthrough-go.socket
> # curl localhost:8080
> curl: (56) Recv failure: Connection reset by peer
> # systemctl status portable-walkthrough-go.socket
> × portable-walkthrough-go.socket - Portable Walkthrough Go Edition Socket
>      Loaded: loaded (/etc/systemd/system.attached/portable-walkthrough-go.socket; disabled; vendor preset: enabled)
>     Drop-In: /etc/systemd/system.attached/portable-walkthrough-go.socket.d
>              └─20-portable.conf
>      Active: failed (Result: service-start-limit-hit) since Sun 2023-04-02 16:30:22 PDT; 11s ago
>    Triggers: ● portable-walkthrough-go.service
>      Listen: [::]:8080 (Stream)
>         CPU: 866us
>
> Apr 02 16:30:12 thelio systemd[1]: Listening on Portable Walkthrough Go Edition Socket.
> Apr 02 16:30:22 thelio systemd[1]: portable-walkthrough-go.socket: Failed with result 'service-start-limit-hit'.
> # systemctl status portable-walkthrough-go
> × portable-walkthrough-go.service - Portable Walkthrough Go Edition Service
>      Loaded: loaded (/etc/systemd/system.attached/portable-walkthrough-go.service; static)
>     Drop-In: /etc/systemd/system.attached/portable-walkthrough-go.service.d
>              └─10-profile.conf, 20-portable.conf
>      Active: failed (Result: exit-code) since Sun 2023-04-02 16:30:22 PDT; 20s ago
> TriggeredBy: × portable-walkthrough-go.socket
>     Process: 278282 ExecStart=/usr/bin/portable-walkthrough-go (code=exited, status=203/EXEC)
>    Main PID: 278282 (code=exited, status=203/EXEC)
>         CPU: 41ms
>
> Apr 02 16:30:22 thelio systemd[1]: Starting Portable Walkthrough Go Edition Service...
> Apr 02 16:30:22 thelio systemd[278282]: portable-walkthrough-go.service: Failed to execute /usr/bin/portable-walkthrough-go: No such file or directory
> Apr 02 16:30:22 thelio systemd[278282]: portable-walkthrough-go.service: Failed at step EXEC spawning /usr/bin/portable-walkthrough-go: No such file or directory
> Apr 02 16:30:22 thelio systemd[1]: portable-walkthrough-go.service: Main process exited, code=exited, status=203/EXEC
> Apr 02 16:30:22 thelio systemd[1]: portable-walkthrough-go.service: Failed with result 'exit-code'.
> Apr 02 16:30:22 thelio systemd[1]: Failed to start Portable Walkthrough Go Edition Service.
> Apr 02 16:30:22 thelio systemd[1]: portable-walkthrough-go.service: Start request repeated too quickly.
> Apr 02 16:30:22 thelio systemd[1]: portable-walkthrough-go.service: Failed with result 'exit-code'.
> Apr 02 16:30:22 thelio systemd[1]: Failed to start Portable Walkthrough Go Edition Service.
> # ./portable-walkthrough-go &
> [1] 278308
> # curl localhost:8080
> Hello! You are visitor #3!
> # fg
> ./portable-walkthrough-go
> ^C
> #

Can't reproduce this either on latest main or on v247. Enable debug
logs with systemctl log-level debug and then restart the service and
check again.