April 2026 focused on delivering a robust varlink protocol upgrade framework in libsystemd, enhancing reliability and testability, expanding deployment options, and fixing upgrade-time FD handling. Key outcomes include new server-side upgrade APIs with two-fds semantics, performance-safe boundary detection using MSG_PEEK, and single-byte reads; FD lifecycle fixes to prevent resource leaks when upgrade direction is unset; an expanded testing stance with script improvements and a new varlinkctl serve verb to support inetd-style and sandboxed endpoints (enabling scenarios like SFTP over varlink). Demonstrated C, libsystemd internals, varlink protocol, FD management, and test automation, delivering business value through safer upgrades, flexible deployments, and faster developer feedback.

March 2026 monthly summary for systemd/systemd. This period emphasized feature delivery that improves upgrade paths, runtime safety, and code quality while advancing core capabilities and tooling. Key outcomes include architectural refactors to improve reuse, protocol upgrade support for varlink, and new shutdown/power interfaces that enable more robust remote control and automation. The month also targeted reliability through targeted bug fixes, boosted test coverage, and static-analysis-oriented improvements that reduce regression risk. Key features delivered and major improvements: - Socket-forward refactor: extracted socket_forward_new() into a dedicated shared helper from socket-proxyd to improve reuse and reduce duplication (commit 9a708c5115d8f10f4ea21b9e16ef47c008ddcdc9). - Socket-forward extension: extended to support fd-pairs in addition to sockets, enabling new upgrade/data-path workflows (commit 1af2d1c3e1e9546d76ac3e1eb70ffeb8dcf50441). - Protocol upgrade support: added sd_varlink_call_and_upgrade() to sd-varlink to enable protocol upgrades and better data transfer semantics (commit 79db432ab26231c24bf7da2a7517feb0a08c5914). - Varlink upgrade path for tooling: varlinkctl gained protocol upgrade support and compatible exec-with-upgrade flow to enable seamless upgrades (commits 0fc3f85d35f155b1242423df120bdadecc0696e7 and 042f633b12c72e20f532647655bbe4afcafc2aa0). - Shutdown/manager integration stabilisation: introduced logind Shutdown varlink interface and relocated verify_shutdown_creds() logic to logind-shutdown.c to support both dbus and varlink paths, with supporting commit activity across related components (d1d72563e0d90f924c8e789a978ff95196e1b969, c1b928c810c8d231657393ad3499d6d2940059b3, db426d147d0ea8082bd8c69628aba63d3ddd635e).

February 2026 performance summary for yuwata/systemd focusing on delivering ephemeral VM snapshot capabilities and expanding varlink-based management interfaces to improve operability, reliability, and extensibility. Key features delivered: - Ephemeral VM snapshots support: nspawn snapshot creation refactored into a shared helper and a new vmspawn --ephemeral option to create temporary VM file-system snapshots. For disk images this uses native QEMU snapshot mechanisms; for directories it leverages the existing nspawn snapshot path with a safe fallback to directory copy. - Varlink enhancements: introduced a journal query service via varlink (GetEntries) with basic filtering; added pluggable protocol bridges that allow dynamic URL schemes through LIBEXECDIR/varlink-bridges; updated related varlink behaviors including removal planning for journalctl varlink support and adjusting CleanPool’s CLI handling to SD_VARLINK_REQUIRES_MORE.