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utils: Add 'wrap-program'.

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* guix/build/utils.scm (wrap-program): New procedure.
This commit is contained in:
Nikita Karetnikov 2013-03-03 23:20:28 +00:00
parent 563e8b3920
commit 02065130de
1 changed files with 67 additions and 1 deletions
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68
guix/build/utils.scm
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@ -1,5 +1,6 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org>
;;;
;;; This file is part of GNU Guix.
;;;
@ -49,7 +50,8 @@
patch-shebang
patch-makefile-SHELL
fold-port-matches
remove-store-references))
remove-store-references
wrap-program))
;;;
@ -605,6 +607,70 @@ known as `nuke-refs' in Nixpkgs."
(put-u8 out (char->integer char))
result))))))
(define* (wrap-program prog #:rest vars)
"Rename PROG to .PROG-real and make PROG a wrapper. VARS should look like
this:
'(VARIABLE DELIMITER POSITION LIST-OF-DIRECTORIES)
where DELIMITER is optional. ':' will be used if DELIMITER is not given.
For example, this command:
(wrap-program \"foo\"
'(\"PATH\" \":\" = (\"/nix/.../bar/bin\"))
'(\"CERT_PATH\" suffix (\"/nix/.../baz/certs\"
\"/qux/certs\")))
will copy 'foo' to '.foo-real' and create the file 'foo' with the following
contents:
#!location/of/bin/bash
export PATH=\"/nix/.../bar/bin\"
export CERT_PATH=\"$CERT_PATH${CERT_PATH:+:}/nix/.../baz/certs:/qux/certs\"
exec location/of/.foo-real
This is useful for scripts that expect particular programs to be in $PATH, for
programs that expect particular shared libraries to be in $LD_LIBRARY_PATH, or
modules in $GUILE_LOAD_PATH, etc."
(let ((prog-real (string-append "." prog "-real"))
(prog-tmp (string-append "." prog "-tmp")))
(define (export-variable lst)
;; Return a string that exports an environment variable.
(match lst
((var sep '= rest)
(format #f "export ~a=\"~a\""
var (string-join rest sep)))
((var sep 'prefix rest)
(format #f "export ~a=\"~a${~a~a+~a}$~a\""
var (string-join rest sep) var sep sep var))
((var sep 'suffix rest)
(format #f "export ~a=\"$~a${~a~a+~a}~a\""
var var var sep sep (string-join rest sep)))
((var '= rest)
(format #f "export ~a=\"~a\""
var (string-join rest ":")))
((var 'prefix rest)
(format #f "export ~a=\"~a${~a:+:}$~a\""
var (string-join rest ":") var var))
((var 'suffix rest)
(format #f "export ~a=\"$~a${~a:+:}~a\""
var var var (string-join rest ":")))))
(copy-file prog prog-real)
(with-output-to-file prog-tmp
(lambda ()
(format #t
"#!~a~%~a~%exec ~a~%"
(which "bash")
(string-join (map export-variable vars)
"\n")
(canonicalize-path prog-real))))
(chmod prog-tmp #o755)
(rename-file prog-tmp prog)))
;;; Local Variables:
;;; eval: (put 'call-with-output-file/atomic 'scheme-indent-function 1)
;;; eval: (put 'with-throw-handler 'scheme-indent-function 1)