• Support for RHEL was added!
• Added journalctl and coredumpctl verbs for running the respective tools on built directory or disk images.
• Added a burn verb to write the output image to a block device.
• Added a new esp output format, which is large similar to the existing uki output format but wraps it in a disk image with only an ESP.
• Presets were renamed to Images. mkosi.images/ is now used instead of mkosi.presets/, the Presets= setting was renamed to Images= and the Presets section was merged into the Config section. The old names can still be used for backwards compatibility.
• Added profiles to support building variants of the same image in one repository. Profiles can be defined in mkosi.profiles/ and one can be selected using the new Profile= setting.
• mkosi will now parse mkosi.local.conf before any other config files if that exists.
• Added a kernel-install plugin. This is only shipped in source tree and not included in the Python module.
• Added a --json option to get the output of mkosi summary as JSON.
• Added shorthand -a for --autologin.
• Scripts with the .chroot extension are now executed in the image automatically.
• Added rpm helper script to have rpm automatically operate on the image when running scripts.
• Added mkosi-as-caller helper script that can be used in scripts to run commands as the user invoking mkosi.
• mkosi-chroot will now start a shell if no arguments are specified.
• Added WithRecommends= to configure whether to install recommended packages by default or not where this is supported. It is disabled by default.
• Added ToolsTreeMirror= setting for configuring the mirror to use for the default tools tree.
• WithDocs= is now enabled by default.
• Added BuildSourcesEphemeral= to make source directories ephemeral when running scripts. This means any changes made to source directories while running scripts will be undone after the scripts have finished executing.
• Added QemuDrives= to have mkosi create extra qemu drives and pass them to qemu when using the qemu verb.
• Added BuildSources= match to match against configured build source targets.
• PackageManagerTrees= was moved to the Distribution section.
• We now automatically configure the qemu firmware, kernel cmdline and initrd based on what type of kernel is passed by the user via -kernel or QemuKernel=.
• The mkosi repository itself now ships configuration to build basic bootable images that can be used to test mkosi.
• Added support for enabling updates-testing repositories for Fedora.
• GPG keys for CentOS, Fedora, Alma and Rocky are now looked up locally first before fetching them remotely.
• Signatures are not required for local packages on Arch anymore.
• Packages on opensuse are now always downloaded in advance before installation when using zypper.
• The tar output is now reproducible.
• We now make sure git can be executed from mkosi scripts without running into permission errors.
• We don't create subdirectories beneath the configured cache directory anymore.
• Workspace directories are now created outside of any source directories. mkosi will either use XDG_CACHE_HOME, $HOME/.cache or /var/tmp depending on the situation.
• Added environment variable MKOSI_DNF to override which dnf to use for building images (dnf or dnf5).
• The rootfs can now be modified when running build scripts (with all changes thrown away after the last build script has been executed).
• mkosi now fails if configuration specified via the CLI does not apply to any image (because it is overridden).
• Added a new doc on building rpms from source with mkosi (docs/building-rpms-from-source.md).
• /etc/resolv.conf will now only be mounted for scripts when they are run with network access.