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62 lines
2.6 KiB
Markdown
62 lines
2.6 KiB
Markdown
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# Release 1.1 (2012-07-18)
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This release has the following improvements:
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- On Linux, when doing a chroot build, Nix now uses various namespace
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features provided by the Linux kernel to improve build isolation.
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Namely:
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- The private network namespace ensures that builders cannot talk
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to the outside world (or vice versa): each build only sees a
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private loopback interface. This also means that two concurrent
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builds can listen on the same port (e.g. as part of a test)
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without conflicting with each other.
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- The PID namespace causes each build to start as PID 1. Processes
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outside of the chroot are not visible to those on the inside. On
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the other hand, processes inside the chroot *are* visible from
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the outside (though with different PIDs).
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- The IPC namespace prevents the builder from communicating with
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outside processes using SysV IPC mechanisms (shared memory,
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message queues, semaphores). It also ensures that all IPC
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objects are destroyed when the builder exits.
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- The UTS namespace ensures that builders see a hostname of
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`localhost` rather than the actual hostname.
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- The private mount namespace was already used by Nix to ensure
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that the bind-mounts used to set up the chroot are cleaned up
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automatically.
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- Build logs are now compressed using `bzip2`. The command `nix-store
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-l` decompresses them on the fly. This can be disabled by setting
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the option `build-compress-log` to `false`.
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- The creation of build logs in `/nix/var/log/nix/drvs` can be
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disabled by setting the new option `build-keep-log` to `false`. This
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is useful, for instance, for Hydra build machines.
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- Nix now reserves some space in `/nix/var/nix/db/reserved` to ensure
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that the garbage collector can run successfully if the disk is full.
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This is necessary because SQLite transactions fail if the disk is
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full.
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- Added a basic `fetchurl` function. This is not intended to replace
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the `fetchurl` in Nixpkgs, but is useful for bootstrapping; e.g., it
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will allow us to get rid of the bootstrap binaries in the Nixpkgs
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source tree and download them instead. You can use it by doing
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`import <nix/fetchurl.nix> { url =
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url; sha256 =
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"hash"; }`. (Shea Levy)
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- Improved RPM spec file. (Michel Alexandre Salim)
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- Support for on-demand socket-based activation in the Nix daemon with
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`systemd`.
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- Added a manpage for nix.conf5.
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- When using the Nix daemon, the `-s` flag in `nix-env -qa` is now
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much faster.
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