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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/manual/src/release-notes/rl-next.md | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/doc/manual/src/release-notes/rl-next.md b/doc/manual/src/release-notes/rl-next.md index 2069e4578..47181fd39 100644 --- a/doc/manual/src/release-notes/rl-next.md +++ b/doc/manual/src/release-notes/rl-next.md @@ -10,3 +10,43 @@ This avoids a lot of spurious errors where some benign strings end-up having a context just because they are read from a store path ([#7260](https://github.com/NixOS/nix/pull/7260)). + +* Nix can now automatically pick UIDs for builds, removing the need to + create `nixbld*` user accounts. these UIDs are allocated starting at + 872415232 on Linux and 56930 on macOS. + + This is an experimental feature. To enable it, add the following to + `nix.conf`: + + ``` + extra-experimental-features = auto-allocate-uids + auto-allocate-uids = true + ``` + +* On Linux, Nix can now run builds in a user namespace where the build + runs as root (UID 0) and has 65,536 UIDs available. This is + primarily useful for running containers such as `systemd-nspawn` + inside a Nix build. + + A build can enable this by requiring the `uid-range` system feature, + i.e. by setting the derivation attribute + + ``` + requiredSystemFeatures = [ "uid-range" ]; + ``` + + The `uid-range` system feature requires the `auto-allocate-uids` + setting to be enabled (see above). + +* On Linux, Nix has experimental support for running builds inside a + cgroup. It can be enabled by adding + + ``` + extra-experimental-features = cgroups + ``` + + to `nix.conf`. It is also automatically enabled for builds that + require the `uid-range` system feature. + +* `nix build --json` now prints some statistics about top-level + derivations, such as CPU statistics when cgroups are enabled. |