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utils: Allow wrap-program to be called multiple times.

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* guix/build/utils.scm (wrap-program): Multiple invocations of
  wrap-program for the same file create successive wrappers.  Adjust
  docstring.
* tests/build-utils.scm: Test new wrap-program behavior.
  (%store): New variable.
This commit is contained in:
Eric Bavier 2014-09-13 01:05:03 -05:00
parent 9fac9e3be3
commit de61113857
2 changed files with 88 additions and 13 deletions
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44
guix/build/utils.scm
View file

@ -687,8 +687,7 @@ (define pattern
result))))))
(define* (wrap-program prog #:rest vars)
"Rename PROG to .PROG-real and make PROG a wrapper. VARS should look like
this:
"Make a wrapper for PROG. VARS should look like this:
'(VARIABLE DELIMITER POSITION LIST-OF-DIRECTORIES)
@ -697,23 +696,44 @@ (define* (wrap-program prog #:rest vars)
For example, this command:
(wrap-program \"foo\"
'(\"PATH\" \":\" = (\"/nix/.../bar/bin\"))
'(\"CERT_PATH\" suffix (\"/nix/.../baz/certs\"
'(\"PATH\" \":\" = (\"/gnu/.../bar/bin\"))
'(\"CERT_PATH\" suffix (\"/gnu/.../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\"
export PATH=\"/gnu/.../bar/bin\"
export CERT_PATH=\"$CERT_PATH${CERT_PATH:+:}/gnu/.../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 (dirname prog) "/." (basename prog) "-real"))
(prog-tmp (string-append (dirname prog) "/." (basename prog) "-tmp")))
modules in $GUILE_LOAD_PATH, etc.
If PROG has previously been wrapped by wrap-program the wrapper will point to
the previous wrapper."
(define (wrapper-file-name number)
(format #f "~a/.~a-wrap-~2'0d" (dirname prog) (basename prog) number))
(define (next-wrapper-number)
(let ((wrappers
(find-files (dirname prog)
(string-append "\\." (basename prog) "-wrap-.*"))))
(if (null? wrappers)
0
(string->number (string-take-right (last wrappers) 2)))))
(define (wrapper-target number)
(if (zero? number)
(let ((prog-real (string-append (dirname prog) "/."
(basename prog) "-real")))
(copy-file prog prog-real)
prog-real)
(wrapper-file-name number)))
(let* ((number (next-wrapper-number))
(target (wrapper-target number))
(wrapper (wrapper-file-name (1+ number)))
(prog-tmp (string-append target "-tmp")))
(define (export-variable lst)
;; Return a string that exports an environment variable.
(match lst
@ -736,8 +756,6 @@ (define (export-variable lst)
(format #f "export ~a=\"$~a${~a:+:}~a\""
var var var (string-join rest ":")))))
(copy-file prog prog-real)
(with-output-to-file prog-tmp
(lambda ()
(format #t
@ -745,9 +763,11 @@ (define (export-variable lst)
(which "bash")
(string-join (map export-variable vars)
"\n")
(canonicalize-path prog-real))))
(canonicalize-path target))))
(chmod prog-tmp #o755)
(rename-file prog-tmp wrapper)
(symlink wrapper prog-tmp)
(rename-file prog-tmp prog)))
;;; Local Variables:

57
tests/build-utils.scm
View file

@ -18,9 +18,24 @@
(define-module (test-build-utils)
#:use-module (guix tests)
#:use-module (guix store)
#:use-module (guix derivations)
#:use-module (guix build utils)
#:use-module (srfi srfi-64))
#:use-module (guix packages)
#:use-module (guix build-system)
#:use-module (guix build-system trivial)
#:use-module (gnu packages)
#:use-module (gnu packages bootstrap)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-64)
#:use-module (rnrs io ports)
#:use-module (ice-9 popen))
(define %store
(open-connection-for-tests))
(test-begin "build-utils")
(test-equal "alist-cons-before"
@ -80,6 +95,46 @@ (define-module (test-build-utils)
port
cons)))))
(test-assert "wrap-program, one input, multiple calls"
(let* ((p (package
(name "test-wrap-program") (version "0") (source #f)
(synopsis #f) (description #f) (license #f) (home-page #f)
(build-system trivial-build-system)
(arguments
`(#:guile ,%bootstrap-guile
#:modules ((guix build utils))
#:builder
(let* ((out (assoc-ref %outputs "out"))
(bash (assoc-ref %build-inputs "bash"))
(foo (string-append out "/foo")))
(begin
(use-modules (guix build utils))
(mkdir out)
(call-with-output-file foo
(lambda (p)
(format p
"#!~a~%echo \"${GUIX_FOO} ${GUIX_BAR}\"~%"
bash)))
(chmod foo #o777)
;; wrap-program uses `which' to find bash for the wrapper
;; shebang, but it can't know about the bootstrap bash in
;; the store, since it's not named "bash". Help it out a
;; bit by providing a symlink it this package's output.
(symlink bash (string-append out "/bash"))
(setenv "PATH" out)
(wrap-program foo `("GUIX_FOO" prefix ("hello")))
(wrap-program foo `("GUIX_BAR" prefix ("world")))
#t))))
(inputs `(("bash" ,(search-bootstrap-binary "bash"
(%current-system)))))))
(d (package-derivation %store p)))
(and (build-derivations %store (pk 'drv d (list d)))
(let* ((p (derivation->output-path d))
(foo (string-append p "/foo"))
(pipe (open-input-pipe foo))
(str (get-string-all pipe)))
(equal? str "hello world\n")))))
(test-end)