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authorLudovic Courtès <ludo@gnu.org>2015-07-15 18:01:05 +0200
committerLudovic Courtès <ludo@gnu.org>2015-07-15 23:57:01 +0200
commitdf36e62938a7a2250601e7652a968e31f89a13f4 (patch)
tree10cb5395b2fbd9a3e544a70838bffba4ea8b3763 /guix/ui.scm
parentd2825c96141c7b6844d9e04f982919c0509165e1 (diff)
ui: Add 'leave-on-EPIPE'.
* guix/scripts/package.scm (leave-on-EPIPE): Move to... * guix/ui.scm (leave-on-EPIPE): ... here.
Diffstat (limited to 'guix/ui.scm')
-rw-r--r--guix/ui.scm17
1 files changed, 17 insertions, 0 deletions
diff --git a/guix/ui.scm b/guix/ui.scm
index 11af646a6e..28d4b97118 100644
--- a/guix/ui.scm
+++ b/guix/ui.scm
@@ -62,6 +62,7 @@
show-manifest-transaction
call-with-error-handling
with-error-handling
+ leave-on-EPIPE
read/eval
read/eval-package-expression
location->string
@@ -430,6 +431,22 @@ interpreted."
(leave (_ "~a: ~a~%") proc
(apply format #f format-string format-args))))))
+(define-syntax-rule (leave-on-EPIPE exp ...)
+ "Run EXP... in a context when EPIPE errors are caught and lead to 'exit'
+with successful exit code. This is useful when writing to the standard output
+may lead to EPIPE, because the standard output is piped through 'head' or
+similar."
+ (catch 'system-error
+ (lambda ()
+ exp ...)
+ (lambda args
+ ;; We really have to exit this brutally, otherwise Guile eventually
+ ;; attempts to flush all the ports, leading to an uncaught EPIPE down
+ ;; the path.
+ (if (= EPIPE (system-error-errno args))
+ (primitive-_exit 0)
+ (apply throw args)))))
+
(define %guix-user-module
;; Module in which user expressions are evaluated.
;; Compute lazily to avoid circularity with (guix gexp).