[systemd-devel] stacked extension not working

[Luca Boccassi]

On Fri, 2021-10-15 at 14:59 +0200, Umut Tezduyar Lindskog wrote:
> Thanks and I would have never figured it out without your help.
> However, moving the binary to /opt didn't work either (I made sure
> there is empty /opt in the base too). Anything else I am missing?
> 
> root at osboxes:/home/osboxes/Development# tree stackupper/
> stackupper/
> ├── bin
> │   └── umut
> ├── dev
> ├── etc
> │   ├── machine-id
> │   ├── resolv.conf
> │   └── runtime
> ├── lib -> usr/lib
> ├── opt
> │   └── tree
> ├── proc
> ├── root
> ├── run
> ├── sys
> ├── tmp
> ├── usr
> │   ├── bin
> │   └── lib
> │       ├── extension-release.d
> │       │   └── extension-release.base
> │       └── systemd
> │           └── system
> │               └── stackupper.service
> └── var
>     └── tmp
> 
> 18 directories, 7 files
> root at osboxes:/home/osboxes/Development# cat
> stackupper/usr/lib/systemd/system/stackupper.service 
> [Service]
> Type=oneshot
> ExecStart=/opt/tree /

The extension-release file in the extension must be named exactly after
the extension (eg: foo.raw must contain /usr/lib/extension-
release.d/extension-release.foo), but in your case it's called ".base"
which doesn't seem right, so double check that. This too is documented
in the man page.

> On Fri, Oct 15, 2021 at 2:23 PM Luca Boccassi <bluca at debian.org>
> wrote:
> > On Fri, 2021-10-15 at 12:18 +0000, Umut Tezduyar Lindskog wrote:
> > > Hi, following works for us (for reference, configuration is
> > printed
> > > at the end)
> > >  
> > > portablectl --now attach --extension=./stackupper ./base
> > stackupper
> > >  
> > > However, if we move the cat from base/usr/bin/cat to
> > > stackupper/bin/cat it is not working. Seems like we cannot
> > include
> > > any library/executable in the extension.
> > >  
> > > Are we missing something? 
> > >  
> > >  
> > > root at osboxes:/home/osboxes/Development# tree base/
> > > base/
> > > ├──bin
> > > ├──dev
> > > ├──etc
> > > │   ├── machine-id
> > > │   ├── os-release
> > > │   └── resolv.conf
> > > ├──lib
> > > │   └── x86_64-linux-gnu
> > > │       └── libc.so.6
> > > ├──lib64
> > > │   ├──ld-2.32.so
> > > │   └── ld-linux-x86-64.so.2
> > > ├──proc
> > > ├──root
> > > ├──run
> > > ├──sys
> > > ├──tmp
> > > ├──usr
> > > │   ├──bin
> > > │   │   ├──cat
> > > │   │   ├──echo
> > > │   │   └── tree
> > > │   └── lib
> > > │       └── systemd
> > > │           └── system
> > > └── var
> > >     └── tmp
> > >  
> > > 18 directories, 9 files
> > >  
> > > root at osboxes:/home/osboxes/Development# tree stackupper/
> > > stackupper/
> > > ├──bin
> > > │   └── umut
> > > ├──dev
> > > ├──etc
> > > │   ├── machine-id
> > > │   ├── resolv.conf
> > > │   └── runtime
> > > ├──lib -> usr/lib
> > > ├──proc
> > > ├──root
> > > ├──run
> > > ├──sys
> > > ├──tmp
> > > ├──usr
> > > │   ├──bin
> > > │   └── lib
> > > │       ├──extension-release.d
> > > │       │   └── extension-release.base
> > > │       └── systemd
> > > │           └── system
> > > │               └── stackupper.service
> > > └── var
> > >     └── tmp
> > >  
> > > 17 directories, 6 files
> > >  
> > > root at osboxes:/home/osboxes/Development# cat
> > > stackupper/usr/lib/systemd/system/stackupper.service 
> > > [Service]
> > > Type=oneshot
> > > ExecStart=/usr/bin/cat /etc/os-release
> > > root at osboxes:/home/osboxes/Development#systemctl --version
> > > systemd 249 (249.4-1)
> > > +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
> > 
> > Hi,
> > 
> > You need to build your extension with the binaries under either the
> > /usr or /opt hierarchies. Legacy locations like /bin and /lib are
> > ignored. This is explained in the systemd-sysext.8 manpage.
> > 

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