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-rw-r--r--guix/inferior.scm21
-rw-r--r--tests/inferior.scm13
2 files changed, 29 insertions, 5 deletions
diff --git a/guix/inferior.scm b/guix/inferior.scm
index 0236fb61ad..6b685ece30 100644
--- a/guix/inferior.scm
+++ b/guix/inferior.scm
@@ -63,6 +63,9 @@
inferior-eval
inferior-eval-with-store
inferior-object?
+ inferior-exception?
+ inferior-exception-arguments
+ inferior-exception-inferior
read-repl-response
inferior-packages
@@ -195,8 +198,15 @@ equivalent. Return #f if the inferior could not be launched."
(set-record-type-printer! <inferior-object> write-inferior-object)
-(define (read-repl-response port)
- "Read a (guix repl) response from PORT and return it as a Scheme object."
+;; Reified exception thrown by an inferior.
+(define-condition-type &inferior-exception &error
+ inferior-exception?
+ (arguments inferior-exception-arguments) ;key + arguments
+ (inferior inferior-exception-inferior)) ;<inferior> | #f
+
+(define* (read-repl-response port #:optional inferior)
+ "Read a (guix repl) response from PORT and return it as a Scheme object.
+Raise '&inferior-exception' when an exception is read from PORT."
(define sexp->object
(match-lambda
(('value value)
@@ -208,10 +218,13 @@ equivalent. Return #f if the inferior could not be launched."
(('values objects ...)
(apply values (map sexp->object objects)))
(('exception key objects ...)
- (apply throw key (map sexp->object objects)))))
+ (raise (condition (&inferior-exception
+ (arguments (cons key (map sexp->object objects)))
+ (inferior inferior)))))))
(define (read-inferior-response inferior)
- (read-repl-response (inferior-socket inferior)))
+ (read-repl-response (inferior-socket inferior)
+ inferior))
(define (send-inferior-request exp inferior)
(write exp (inferior-socket inferior))
diff --git a/tests/inferior.scm b/tests/inferior.scm
index f54b6d6037..b4417d8629 100644
--- a/tests/inferior.scm
+++ b/tests/inferior.scm
@@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2018, 2019 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -61,6 +61,17 @@
(close-inferior inferior)
(list a (inferior-object? b))))))
+(test-equal "&inferior-exception"
+ '(a b c d)
+ (let ((inferior (open-inferior %top-builddir
+ #:command "scripts/guix")))
+ (guard (c ((inferior-exception? c)
+ (close-inferior inferior)
+ (and (eq? inferior (inferior-exception-inferior c))
+ (inferior-exception-arguments c))))
+ (inferior-eval '(throw 'a 'b 'c 'd) inferior)
+ 'badness)))
+
(test-equal "inferior-packages"
(take (sort (fold-packages (lambda (package lst)
(cons (list (package-name package)