Before this change it was crucial that nonprivileged users are unable to create hardlinks to SUID wrappers, lest they be able to provide a different `.real` file alongside. That was ensured by not providing a location writable to them in the /run/wrappers tmpfs, (unless disabled) by the fs.protected_hardlinks=1 sysctl, and by the explicit own-path check in the wrapper. After this change, ensuring that property is no longer important, and the check is most likely redundant. The simplification of expectations of the wrapper will make it easier to remove some of the assertions in the wrapper (which currently cause the wrapper to fail in no_new_privs environments, instead of executing the target with non-elevated privileges). Note that wrappers had to be copied (not symlinked) into /run/wrappers due to the SUID/capability bits, and they couldn't be hard/softlinks of each other due to those bits potentially differing. Thus, this change doesn't increase the amount of memory used by /run/wrappers. |
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.. | ||
doc/manual | ||
lib | ||
maintainers | ||
modules | ||
tests | ||
COPYING | ||
default.nix | ||
README.md | ||
release-combined.nix | ||
release-small.nix | ||
release.nix |
NixOS
NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at https://nixos.org/nixos and in the manual in doc/manual.
Testing changes
You can add new module to your NixOS configuration file (usually it’s /etc/nixos/configuration.nix
). And do sudo nixos-rebuild test -I nixpkgs=<path to your local nixpkgs folder> --fast
.
Reviewing contributions
When changing the bootloader installation process, extra care must be taken. Grub installations cannot be rolled back, hence changes may break people’s installations forever. For any non-trivial change to the bootloader please file a PR asking for review, especially from @edolstra.
Module updates
Module updates are submissions changing modules in some ways. These often contains changes to the options or introduce new options.
Reviewing process:
- Ensure that the module maintainers are notified.
- CODEOWNERS will make GitHub notify users based on the submitted changes, but it can happen that it misses some of the package maintainers.
- Ensure that the module tests, if any, are succeeding.
- Ensure that the introduced options are correct.
- Type should be appropriate (string related types differs in their merging capabilities,
loaOf
andstring
types are deprecated). - Description, default and example should be provided.
- Type should be appropriate (string related types differs in their merging capabilities,
- Ensure that option changes are backward compatible.
mkRenamedOptionModuleWith
provides a way to make option changes backward compatible.
- Ensure that removed options are declared with
mkRemovedOptionModule
- Ensure that changes that are not backward compatible are mentioned in release notes.
- Ensure that documentations affected by the change is updated.
Sample template for a module update review is provided below.
##### Reviewed points
- [ ] changes are backward compatible
- [ ] removed options are declared with `mkRemovedOptionModule`
- [ ] changes that are not backward compatible are documented in release notes
- [ ] module tests succeed on ARCHITECTURE
- [ ] options types are appropriate
- [ ] options description is set
- [ ] options example is provided
- [ ] documentation affected by the changes is updated
##### Possible improvements
##### Comments
New modules
New modules submissions introduce a new module to NixOS.
Reviewing process:
- Ensure that the module tests, if any, are succeeding.
- Ensure that the introduced options are correct.
- Type should be appropriate (string related types differs in their merging capabilities,
loaOf
andstring
types are deprecated). - Description, default and example should be provided.
- Type should be appropriate (string related types differs in their merging capabilities,
- Ensure that module
meta
field is present- Maintainers should be declared in
meta.maintainers
. - Module documentation should be declared with
meta.doc
.
- Maintainers should be declared in
- Ensure that the module respect other modules functionality.
- For example, enabling a module should not open firewall ports by default.
Sample template for a new module review is provided below.
##### Reviewed points
- [ ] module path fits the guidelines
- [ ] module tests succeed on ARCHITECTURE
- [ ] options have appropriate types
- [ ] options have default
- [ ] options have example
- [ ] options have descriptions
- [ ] No unneeded package is added to environment.systemPackages
- [ ] meta.maintainers is set
- [ ] module documentation is declared in meta.doc
##### Possible improvements
##### Comments