> Remember that (guix build ...) modules must not use Guix modules other > than (guix build ...). This is a convention to distinguish between code > for the “builder stratum”, and code for the “host stratum”.
OK. But how can I get the location of a package? The needed procedure
(i.e., 'package-output') is in the host code.
> (define* (wrap-program file #:rest variables)
> ...)
Why do you want to use '#:rest' here? The purpose of 'wrap-program' is
to export some variables.
> export CERT_PATH=$CERT_PATH${CERT_PATH:+:}:/nix/.../share/certs
Could you explain the "$CERT_PATH${CERT_PATH:+:}" part?
> Perhaps the separator string could be optional.
Is it possible to make it optional without creating a separate clause?
I'm attaching a patch. It lacks the 'rename-file' part.
From 0c84fdb879c78a129c9d77bcdf9a5e3135825ad9 Mon Sep 17 00:00:00 2001
From: Nikita Karetnikov <nik...@karetnikov.org>
Date: Thu, 28 Feb 2013 20:27:36 +0000
Subject: [PATCH] utils: Add 'wrap-program'.
* guix/build/utils.scm (wrap-program): New procedure.
---
guix/build/utils.scm | 41 ++++++++++++++++++++++++++++++++++++++++-
1 files changed, 40 insertions(+), 1 deletions(-)
diff --git a/guix/build/utils.scm b/guix/build/utils.scm
index 6921e31..63012f0 100644
--- a/guix/build/utils.scm
+++ b/guix/build/utils.scm
@@ -49,7 +49,8 @@
patch-shebang
patch-makefile-SHELL
fold-port-matches
- remove-store-references))
+ remove-store-references
+ wrap-program))
;;;
@@ -605,6 +606,44 @@ known as `nuke-refs' in Nixpkgs."
(put-u8 out (char->integer char))
result))))))
+(define (wrap-program prog varlst)
+ "Copy PROG to .PROG-real and make PROG a wrapper."
+ (define (export-envvar lst)
+ ;; Return a string that exports an environment variable.
+ (define (separate lst delim)
+ ;; Return a string of directories separated by DELIM.
+ (fold-right (lambda (x acc)
+ (if (string-null? acc)
+ x
+ (string-append x delim acc)))
+ ""
+ lst))
+
+ ;; TODO: Make SEP optional.
+ (match lst
+ ((var sep '= rest)
+ (format #f "export ~a=\"~a\""
+ var (separate rest sep)))
+
+ ((var sep 'prefix rest)
+ (format #f "export ~a=\"~a~a${~a~a+~a}$~a\""
+ var (separate rest sep) sep var sep sep var))
+
+ ((var sep 'suffix rest)
+ (format #f "export ~a=\"$~a${~a~a+~a}~a~a\""
+ var var var sep sep sep (separate rest sep)))))
+
+ ;; XXX: Use an absolute filename; remove '-real'.
+ (format #f "#!~a~%~aexec ./.~a-real~%"
+ (which "bash")
+
+ (fold-right (lambda (x acc)
+ (string-append x "\n" acc))
+ ""
+ (map export-envvar varlst))
+
+ prog)) ; XXX: use a real program instead
+
;;; Local Variables:
;;; eval: (put 'call-with-output-file/atomic 'scheme-indent-function 1)
;;; eval: (put 'with-throw-handler 'scheme-indent-function 1)
--
1.7.5.4
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