stacked extension not working

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@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@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@osboxes:/home/osboxes/Development# cat stackupper/usr/lib/systemd/system/stackupper.service 

[Service]

Type=oneshot

ExecStart=/usr/bin/cat /etc/os-release

root@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