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linux-container: "run-container" scripts shows the container's PID.

* gnu/build/linux-container.scm (call-with-container): Add
 #:process-spawned-hook and honor it.
* gnu/system/linux-container.scm (container-script)[script]:
Define 'explain' and pass it as #:process-spawned-hook'.
This commit is contained in:
Ludovic Courtès 2019-09-12 23:06:12 +02:00
parent 3d8424a5ad
commit d236cd16a7
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GPG key ID: 090B11993D9AEBB5
2 changed files with 22 additions and 4 deletions

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@ -299,8 +299,10 @@ delete it when leaving the dynamic extent of this call."
(false-if-exception (delete-file-recursively tmp-dir))))))
(define* (call-with-container mounts thunk #:key (namespaces %namespaces)
(host-uids 1) (guest-uid 0) (guest-gid 0))
"Run THUNK in a new container process and return its exit status.
(host-uids 1) (guest-uid 0) (guest-gid 0)
(process-spawned-hook (const #t)))
"Run THUNK in a new container process and return its exit status; call
PROCESS-SPAWNED-HOOK with the PID of the new process that has been spawned.
MOUNTS is a list of <file-system> objects that specify file systems to mount
inside the container. NAMESPACES is a list of symbols corresponding to
the identifiers for Linux namespaces: mnt, ipc, uts, pid, user, and net. By
@ -329,6 +331,7 @@ load path must be adjusted as needed."
(false-if-exception
(kill pid SIGKILL))))
(process-spawned-hook pid)
(match (waitpid pid)
((_ . status) status))))))