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-rw-r--r--guix/build/gnu-build-system.scm39
1 files changed, 38 insertions, 1 deletions
diff --git a/guix/build/gnu-build-system.scm b/guix/build/gnu-build-system.scm
index 39707e7ace..51b8f9acbf 100644
--- a/guix/build/gnu-build-system.scm
+++ b/guix/build/gnu-build-system.scm
@@ -72,6 +72,42 @@ there are none."
((first . _) first)
(_ #f)))
+(define* (separate-from-pid1 #:key (separate-from-pid1? #t)
+ #:allow-other-keys)
+ "When running as PID 1 and SEPARATE-FROM-PID1? is true, run build phases as
+a child process; PID 1 then becomes responsible for reaping child processes."
+ (if separate-from-pid1?
+ (if (= 1 (getpid))
+ (dynamic-wind
+ (const #t)
+ (lambda ()
+ (match (primitive-fork)
+ (0 #t)
+ (builder-pid
+ (format (current-error-port)
+ "build process now running as PID ~a~%"
+ builder-pid)
+ (let loop ()
+ ;; Running as PID 1 so take responsibility for reaping
+ ;; child processes.
+ (match (waitpid WAIT_ANY)
+ ((pid . status)
+ (if (= pid builder-pid)
+ (if (zero? status)
+ (primitive-exit 0)
+ (begin
+ (format (current-error-port)
+ "build process ~a exited with status ~a~%"
+ pid status)
+ (primitive-exit 1)))
+ (loop))))))))
+ (const #t))
+ (format (current-error-port) "not running as PID 1 (PID: ~a)~%"
+ (getpid)))
+ (format (current-error-port)
+ "build process running as PID ~a; not forking~%"
+ (getpid))))
+
(define* (set-paths #:key target inputs native-inputs
(search-paths '()) (native-search-paths '())
#:allow-other-keys)
@@ -872,7 +908,8 @@ that traversing all the RUNPATH entries entails."
;; Standard build phases, as a list of symbol/procedure pairs.
(let-syntax ((phases (syntax-rules ()
((_ p ...) `((p . ,p) ...)))))
- (phases set-SOURCE-DATE-EPOCH set-paths install-locale unpack
+ (phases separate-from-pid1
+ set-SOURCE-DATE-EPOCH set-paths install-locale unpack
bootstrap
patch-usr-bin-file
patch-source-shebangs configure patch-generated-file-shebangs