From 1a43e4dc572c49e01380c86cdf09934aa0560917 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= Date: Sat, 4 Jan 2014 22:42:42 +0100 Subject: [PATCH] guix package: Gracefully deal with EPIPE on stdout for --list-*. * guix/scripts/package.scm (leave-on-EPIPE): New macro. (guix-package): Use it for 'list-installed', 'list-available', and '--list-generations'. * tests/guix-package.sh: Add test. --- guix/scripts/package.scm | 66 ++++++++++++++++++++++++++-------------- tests/guix-package.sh | 9 +++++- 2 files changed, 51 insertions(+), 24 deletions(-) diff --git a/guix/scripts/package.scm b/guix/scripts/package.scm index 7cebf6b4d4..c12ddcd8c9 100644 --- a/guix/scripts/package.scm +++ b/guix/scripts/package.scm @@ -1,5 +1,5 @@ ;;; GNU Guix --- Functional package management for GNU -;;; Copyright © 2012, 2013 Ludovic Courtès +;;; Copyright © 2012, 2013, 2014 Ludovic Courtès ;;; Copyright © 2013 Nikita Karetnikov ;;; Copyright © 2013 Mark H Weaver ;;; @@ -293,6 +293,22 @@ return its return value." (format (current-error-port) " interrupted by signal ~a~%" SIGINT) #f)))) +(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* (specification->package+output spec #:optional (output "out")) "Return the package and output specified by SPEC, or #f and #f; SPEC may optionally contain a version number and an output name, as in these examples: @@ -958,15 +974,17 @@ more information.~%")) profile)) ((string-null? pattern) (let ((numbers (generation-numbers profile))) - (if (equal? numbers '(0)) - (exit 0) - (for-each list-generation numbers)))) + (leave-on-EPIPE + (if (equal? numbers '(0)) + (exit 0) + (for-each list-generation numbers))))) ((matching-generations pattern profile) => (lambda (numbers) (if (null-list? numbers) (exit 1) - (for-each list-generation numbers)))) + (leave-on-EPIPE + (for-each list-generation numbers))))) (else (leave (_ "invalid syntax: ~a~%") pattern))) @@ -976,15 +994,16 @@ more information.~%")) (let* ((regexp (and regexp (make-regexp regexp))) (manifest (profile-manifest profile)) (installed (manifest-entries manifest))) - (for-each (match-lambda - (($ name version output path _) - (when (or (not regexp) - (regexp-exec regexp name)) - (format #t "~a\t~a\t~a\t~a~%" - name (or version "?") output path)))) + (leave-on-EPIPE + (for-each (match-lambda + (($ name version output path _) + (when (or (not regexp) + (regexp-exec regexp name)) + (format #t "~a\t~a\t~a\t~a~%" + name (or version "?") output path)))) - ;; Show most recently installed packages last. - (reverse installed)) + ;; Show most recently installed packages last. + (reverse installed))) #t)) (('list-available regexp) @@ -998,16 +1017,17 @@ more information.~%")) r) (cons p r)))) '()))) - (for-each (lambda (p) - (format #t "~a\t~a\t~a\t~a~%" - (package-name p) - (package-version p) - (string-join (package-outputs p) ",") - (location->string (package-location p)))) - (sort available - (lambda (p1 p2) - (stringstring (package-location p)))) + (sort available + (lambda (p1 p2) + (string +# Copyright © 2012, 2013, 2014 Ludovic Courtès # Copyright © 2013 Nikita Karetnikov # # This file is part of GNU Guix. @@ -218,3 +218,10 @@ done # Extraneous argument. if guix package install foo-bar; then false; else true; fi + +# Make sure the "broken pipe" doesn't yield an error. +# Note: 'pipefail' is a Bash-specific option. +set -o pipefail || true +guix package -A g | head -1 2> "$HOME/err1" +guix package -I | head -1 2> "$HOME/err2" +test "`cat "$HOME/err1" "$HOME/err2"`" = ""