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linux-container: Handle CLONE_NEWCGROUP and use it by default.

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Adds low-level support for launching Linux containers with cgroup namespaces.

* gnu/build/linux-container.scm (%namespaces): Add 'cgroup.
(namespaces->bit-mask): Handle it.
* guix/build/syscalls.scm (CLONE_NEWCGROUP): New variable.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
Ryan Sundberg 2021-12-29 19:52:16 -08:00 committed by Ludovic Courtès
parent 2c1807c516
commit bfdeba11f8
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GPG Key ID: 090B11993D9AEBB5
2 changed files with 4 additions and 1 deletions
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3
gnu/build/linux-container.scm
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@ -52,7 +52,7 @@ exists."
(file-exists? "/proc/self/setgroups"))
(define %namespaces
'(mnt pid ipc uts user net))
'(cgroup mnt pid ipc uts user net))
(define (call-with-clean-exit thunk)
"Apply THUNK, but exit with a status code of 1 if it fails."
@ -210,6 +210,7 @@ corresponds to the symbols in NAMESPACES."
;; Use the same flags as fork(3) in addition to the namespace flags.
(apply logior SIGCHLD
(map (match-lambda
('cgroup CLONE_NEWCGROUP)
('mnt CLONE_NEWNS)
('uts CLONE_NEWUTS)
('ipc CLONE_NEWIPC)

2
guix/build/syscalls.scm
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@ -132,6 +132,7 @@
CLONE_CHILD_CLEARTID
CLONE_CHILD_SETTID
CLONE_NEWCGROUP
CLONE_NEWNS
CLONE_NEWUTS
CLONE_NEWIPC
@ -1025,6 +1026,7 @@ caller lacks root privileges."
;; Linux clone flags, from linux/sched.h
(define CLONE_CHILD_CLEARTID #x00200000)
(define CLONE_CHILD_SETTID #x01000000)
(define CLONE_NEWCGROUP #x02000000)
(define CLONE_NEWNS #x00020000)
(define CLONE_NEWUTS #x04000000)
(define CLONE_NEWIPC #x08000000)