Lennart Poettering
805742a9c5
The idea is that we can build a container by building a single-binary systemd: ```console $ meson setup build-static --default-library=static --prefer-static --auto-features=disabled -Dbuild-static=true -Dsystemd-multicall-binary=true && ninja -C build-static systemd $ mkdir /var/tmp/container/usr/lib -p $ cp build-static/systemd /var/tmp/container/usr/lib/ $ echo 'ID=quick' >/var/tmp/container/usr/lib/os-release $ systemd-nspawn --restrict-address-families=af_unix --register=no --private-users=managed -D /var/tmp/container/ /usr/lib/systemd ░ Spawning container container on /var/tmp/container. ░ Press Ctrl-] three times within 1s to kill container; two times followed by r ░ to reboot container; two times followed by p to poweroff container. Selected user namespace base 1855193088 and range 65536. systemd 262~devel running in system mode (-PAM -AUDIT +SELINUX -APPARMOR +IMA +IPE +SMACK -SECCOMP -GCRYPT +GNUTLS +OPENSSL -ACL +BLKID +CURL -ELFUTILS -FIDO2 +IDN2 +KMOD +LIBCRYPTSETUP +LIBCRYPTSETUP_PLUGINS +LIBFDISK +PCRE2 -PWQUALITY +P11KIT +QRENCODE +TPM2 -BZIP2 -LZ4 +XZ +ZLIB +ZSTD -BPF_FRAMEWORK -BTF -XKBCOMMON +UTMP -LIBARCHIVE) Detected virtualization systemd-nspawn. Detected architecture x86-64. Detected first boot. Welcome to Linux! Initializing machine ID from container UUID. Failed to open netlink, ignoring: Address family not supported by protocol Applying preset policy. Populated /etc with preset unit settings. Unit default.target not found. Falling back to graphical.target. Mount unit not supported, skipping *MountsFor= dependencies. Queued start job for default target graphical.target. [ OK ] Reached target sysinit.target. [ OK ] Reached target basic.target. System is tainted: unmerged-bin:var-run-bad [ OK ] Reached target multi-user.target. [ OK ] Reached target graphical.target. Startup finished in 61ms. ``` The container can be reloaded with SIGTERM, powered off with SIGRTMIN+4, etc. SIGRTMIN+5 should cause a reboot but it currently fails: ``` ... Rebooting. Container container is being rebooted. Failed to attach root directory: Invalid argument Failed to receive mount namespace fd from outer child: Input/output error ``` It's a bug … somewhere, but probably not caused by the linking changes being done here.
System and Service Manager
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