+if unshare -r true
+then
+ # Check what happens if the wrapped binary forks and leaves child
+ # processes behind, like a daemon. The root file system should remain
+ # available to those child processes. See <https://bugs.gnu.org/44261>.
+ cat > "$test_directory/manifest.scm" <<EOF
+(use-modules (guix))
+
+(define daemon
+ (program-file "daemon"
+ #~(begin
+ (use-modules (ice-9 match)
+ (ice-9 ftw))
+
+ (call-with-output-file "parent-store"
+ (lambda (port)
+ (write (scandir (ungexp (%store-prefix)))
+ port)))
+
+ (match (primitive-fork)
+ (0 (sigaction SIGHUP (const #t))
+ (call-with-output-file "pid"
+ (lambda (port)
+ (display (getpid) port)))
+ (pause)
+ (call-with-output-file "child-store"
+ (lambda (port)
+ (write (scandir (ungexp (%store-prefix)))
+ port))))
+ (_ #t)))))
+
+(define package
+ (computed-file "package"
+ #~(let ((out (ungexp output)))
+ (mkdir out)
+ (mkdir (string-append out "/bin"))
+ (symlink (ungexp daemon)
+ (string-append out "/bin/daemon")))))
+
+(manifest (list (manifest-entry
+ (name "daemon")
+ (version "0")
+ (item package))))
+EOF
+
+ tarball="$(guix pack -S /bin=bin -R -m "$test_directory/manifest.scm")"
+ (cd "$test_directory"; tar xf "$tarball")
+
+ # Run '/bin/daemon', which forks, then wait for the child, send it SIGHUP
+ # so that it dumps its view of the store, and make sure the child and
+ # parent both see the same store contents.
+ (cd "$test_directory"; run_without_store ./bin/daemon)
+ wait_for_file "$test_directory/pid"
+ kill -HUP $(cat "$test_directory/pid")
+ wait_for_file "$test_directory/child-store"
+ diff -u "$test_directory/parent-store" "$test_directory/child-store"
+
+ chmod -Rf +w "$test_directory"; rm -rf "$test_directory"/*
+fi
+