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;; Common definitions for executing gpg and related tools.
;;
;; Copyright (C) 2016, 2017 g10 Code GmbH
;;
;; This file is part of GnuPG.
;;
;; GnuPG is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3 of the License, or
;; (at your option) any later version.
;;
;; GnuPG is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with this program; if not, see <http://www.gnu.org/licenses/>.
;; Evaluate a sequence of expressions with the given home directory.
(define-macro (with-home-directory gnupghome . expressions)
(let ((original-home-directory (gensym)))
`(let ((,original-home-directory (getenv "GNUPGHOME")))
(dynamic-wind
(lambda () (setenv "GNUPGHOME" ,gnupghome #t))
(lambda () ,@expressions)
(lambda () (setenv "GNUPGHOME" ,original-home-directory #t))))))
;; Evaluate a sequence of expressions with an ephemeral home
;; directory.
(define-macro (with-ephemeral-home-directory setup-fn teardown-fn . expressions)
(let ((original-home-directory (gensym))
(ephemeral-home-directory (gensym))
(setup (gensym))
(teardown (gensym)))
`(let ((,original-home-directory (getenv "GNUPGHOME"))
(,ephemeral-home-directory (mkdtemp))
(,setup (delay (,setup-fn)))
(,teardown (delay (,teardown-fn))))
(finally (unlink-recursively ,ephemeral-home-directory)
(dynamic-wind
(lambda ()
(setenv "GNUPGHOME" ,ephemeral-home-directory #t)
(with-working-directory ,ephemeral-home-directory (force ,setup)))
(lambda () ,@expressions)
(lambda ()
(setenv "GNUPGHOME" ,ephemeral-home-directory #t)
(with-working-directory ,ephemeral-home-directory (force ,teardown))
(setenv "GNUPGHOME" ,original-home-directory #t)))))))
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