Release 1.5.0-rc.2

[kolyshkin]

Changelog copy/paste:

1.5.0-rc.2 - 2026-04-02

いざやいざや、見に行かん

Note

runc v1.5.0-rc.2 includes all of the patches backported to runc v1.4.2.

Fixed

• Building with libpathrs for systems that use non-GNU awk, e.g. Debian.
  ([1.5] build: use POSIX regex in libpathrs build #5196, build: use POSIX regex in libpathrs build #5194)

Added

• Installation notes for libpathrs. ([1.5] README: add libpathrs installation notes #5199, README: add libpathrs installation notes #5195)
• Support for specs.LinuxSeccompFlagWaitKillableRecv. ([1.5] Support specs.LinuxSeccompFlagWaitKillableRecv #5183, Support specs.LinuxSeccompFlagWaitKillableRecv #5172)
• When building runc, RUNC_BUILDTAGS make or shell environment variable can
  be used to add build tags and/or remove existing build tags (when a tag is
  prefixed with -). ([1.5] Makefile: add RUNC_BUILDTAGS, deprecate EXTRA_BUILDTAGS #5198, Makefile: add RUNC_BUILDTAGS, deprecate EXTRA_BUILDTAGS #5171)

Changed

• runc now requires Go 1.25+ to build. ([1.5] Switch to Go 1.25+ #5211, Switch to Go 1.25+ #5205)
• libcontainer now pre-opens container root filesystem and uses the file
  descriptor (rather than the path) for most operations related to container
  root during container start. ([1.5] Pre-open container root directory #5204, Pre-open container root directory #5190)

Deprecated

• EXTRA_BUILDTAGS make variable is deprecated in favor of RUNC_BUILDTAGS
  and will be removed in runc 1.6. ([1.5] Makefile: add RUNC_BUILDTAGS, deprecate EXTRA_BUILDTAGS #5198, Makefile: add RUNC_BUILDTAGS, deprecate EXTRA_BUILDTAGS #5171)
• libcontainer/devices has been deprecated in favour of
  github.com/moby/sys/devices (which is a carbon copy of the package). It
  will be removed in runc 1.6. ([1.5] libct/devices: deprecate in favour of moby/sys/devices #5220, libct: deprecate libcontainer/devices in favour of moby/sys/devices #5142)

[Copilot]

Pull request overview

Updates release metadata for the next runc pre-release by bumping the embedded VERSION and adding corresponding CHANGELOG entries (including updated comparison links).

Changes:

• Bump VERSION to 1.5.0-rc.2+dev.
• Add 1.5.0-rc.2 release notes to CHANGELOG.md.
• Add 1.4.2 release notes and update “Unreleased” comparison links in CHANGELOG.md.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
VERSION	Updates the embedded runc version string to the next RC development version.
CHANGELOG.md	Adds release notes for 1.5.0-rc.2 and 1.4.2, and updates comparison/reference links.

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[lifubang]

LGTM
Once #5220 merged before you make the release, remember add it to the deprecated section.

[kolyshkin]

LGTM Once #5220 merged before you make the release, remember add it to the deprecated section.

Done.

[cyphar]

@AkihiroSuda I will try to get the libpathrs version stuff done as soon as I can...