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guix/tests/build-utils.scm
Maxime Devos 5378edeab4
utils: Define ‘search-input-file’ procedure.
The procedure ‘which’ from (guix build utils)
is used for two different purposes:

  1. for finding the absolute file name of a binary
     that needs to run during the build process

  2. for finding the absolute file name of a binary,
     for the target system (as in --target=TARGET),
     e.g. for substituting sh->/gnu/store/.../bin/sh,
     python->/gnu/store/.../bin/python.

When compiling natively (target=#f in Guix parlance),
this is perfectly fine.

However, when cross-compiling, there is a problem.
"which" looks in $PATH for binaries.  That's good for purpose (1),
but incorrect for (2), as the $PATH contains binaries from native-inputs
instead of inputs.

This commit defines a ‘search-input-file’ procedure. It functions
like 'which', but instead of searching in $PATH, it searches in
the 'inputs' of the build phase, which must be passed to
‘search-input-file’ as an argument. Also, the file name must
include "bin/" or "sbin/" as appropriate.

* guix/build/utils.scm (search-input-file): New procedure.
* tests/build-utils.scm
  ("search-input-file: exception if not found")
  ("search-input-file: can find if existent"): Test it.
* doc/guix.texi (File Search): Document it.

Partially-Fixes: <https://issues.guix.gnu.org/47869>
Co-Authored-By: Ludovic Courtès <ludo@gnu.org>
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
2021-06-04 22:34:26 +02:00

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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2015, 2016, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2019 Ricardo Wurmus <rekado@elephly.net>
;;; Copyright © 2021 Maxim Cournoyer <maxim.cournoyer@gmail.com>
;;; Copyright © 2021 Maxime Devos <maximedevos@telenet.be>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix 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.
;;;
;;; GNU Guix 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 GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (test build-utils)
#:use-module (guix tests)
#:use-module (guix build utils)
#:use-module ((guix utils)
#:select (%current-system call-with-temporary-directory))
#:use-module (gnu packages)
#:use-module (gnu packages bootstrap)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
#:use-module (srfi srfi-64)
#:use-module (rnrs io ports)
#:use-module (ice-9 popen))
(test-begin "build-utils")
(test-equal "alist-cons-before"
'((a . 1) (x . 42) (b . 2) (c . 3))
(alist-cons-before 'b 'x 42 '((a . 1) (b . 2) (c . 3))))
(test-equal "alist-cons-before, reference not found"
'((a . 1) (b . 2) (c . 3) (x . 42))
(alist-cons-before 'z 'x 42 '((a . 1) (b . 2) (c . 3))))
(test-equal "alist-cons-after"
'((a . 1) (b . 2) (x . 42) (c . 3))
(alist-cons-after 'b 'x 42 '((a . 1) (b . 2) (c . 3))))
(test-equal "alist-cons-after, reference not found"
'((a . 1) (b . 2) (c . 3) (x . 42))
(alist-cons-after 'z 'x 42 '((a . 1) (b . 2) (c . 3))))
(test-equal "alist-replace"
'((a . 1) (b . 77) (c . 3))
(alist-replace 'b 77 '((a . 1) (b . 2) (c . 3))))
(test-assert "alist-replace, key not found"
(not (false-if-exception
(alist-replace 'z 77 '((a . 1) (b . 2) (c . 3))))))
(test-equal "fold-port-matches"
(make-list 3 "Guix")
(call-with-input-string "Guix is cool, Guix rocks, and it uses Guile, Guix!"
(lambda (port)
(fold-port-matches cons '() "Guix" port))))
(test-equal "fold-port-matches, trickier"
(reverse '("Guix" "guix" "Guix" "guiX" "Guix"))
(call-with-input-string "Guix, guix, GuiGuixguiX, Guix"
(lambda (port)
(fold-port-matches cons '()
(list (char-set #\G #\g)
(char-set #\u)
(char-set #\i)
(char-set #\x #\X))
port))))
(test-equal "fold-port-matches, with unmatched chars"
'("Guix" #\, #\space
"guix" #\, #\space
#\G #\u #\i "Guix" "guiX" #\, #\space
"Guix")
(call-with-input-string "Guix, guix, GuiGuixguiX, Guix"
(lambda (port)
(reverse
(fold-port-matches cons '()
(list (char-set #\G #\g)
(char-set #\u)
(char-set #\i)
(char-set #\x #\X))
port
cons)))))
(test-equal "wrap-program, one input, multiple calls"
"hello world\n"
(call-with-temporary-directory
(lambda (directory)
(let ((bash (search-bootstrap-binary "bash" (%current-system)))
(foo (string-append directory "/foo")))
(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.
(with-environment-variable "PATH" (dirname bash)
(wrap-program foo `("GUIX_FOO" prefix ("hello")))
(wrap-program foo `("GUIX_BAR" prefix ("world")))
;; The bootstrap Bash is linked against an old libc and would abort
;; with an assertion failure when trying to load incompatible locale
;; data.
(unsetenv "LOCPATH")
(let* ((pipe (open-input-pipe foo))
(str (get-string-all pipe)))
(with-directory-excursion directory
(for-each delete-file '("foo" ".foo-real")))
(and (zero? (close-pipe pipe))
str)))))))
(test-assert "invoke/quiet, success"
(begin
(invoke/quiet "true")
#t))
(test-assert "invoke/quiet, failure"
(guard (c ((message-condition? c)
(string-contains (condition-message c) "This is an error.")))
(invoke/quiet "sh" "-c" "echo This is an error. ; false")
#f))
(test-assert "invoke/quiet, failure, message on stderr"
(guard (c ((message-condition? c)
(string-contains (condition-message c)
"This is another error.")))
(invoke/quiet "sh" "-c" "echo This is another error. >&2 ; false")
#f))
(let ((script-contents "\
#!/anything/cabbage-bash-1.2.3/bin/sh
echo hello world"))
(test-equal "wrap-script, simple case"
(string-append
(format #f "\
#!~a --no-auto-compile
#!#; Guix wrapper
#\\-~s
#\\-~s
"
(which "guile")
'(begin (let ((current (getenv "GUIX_FOO")))
(setenv "GUIX_FOO"
(if current
(string-append "/some/path:/some/other/path"
":" current)
"/some/path:/some/other/path"))))
'(let ((cl (command-line)))
(apply execl "/anything/cabbage-bash-1.2.3/bin/sh"
(car cl)
(cons (car cl)
(append '("") cl)))))
script-contents)
(call-with-temporary-directory
(lambda (directory)
(let ((script-file-name (string-append directory "/foo")))
(call-with-output-file script-file-name
(lambda (port)
(display script-contents port)))
(chmod script-file-name #o777)
(wrap-script script-file-name
`("GUIX_FOO" prefix ("/some/path"
"/some/other/path")))
(let ((str (call-with-input-file script-file-name get-string-all)))
(with-directory-excursion directory
(delete-file "foo"))
str))))))
(let ((script-contents "\
#!/anything/cabbage-bash-1.2.3/bin/python3 -and -args
# vim:fileencoding=utf-8
print('hello world')"))
(test-equal "wrap-script, with encoding declaration"
(string-append
(format #f "\
#!MYGUILE --no-auto-compile
#!#; # vim:fileencoding=utf-8
#\\-~s
#\\-~s
"
'(begin (let ((current (getenv "GUIX_FOO")))
(setenv "GUIX_FOO"
(if current
(string-append "/some/path:/some/other/path"
":" current)
"/some/path:/some/other/path"))))
`(let ((cl (command-line)))
(apply execl "/anything/cabbage-bash-1.2.3/bin/python3"
(car cl)
(cons (car cl)
(append '("" "-and" "-args") cl)))))
script-contents)
(call-with-temporary-directory
(lambda (directory)
(let ((script-file-name (string-append directory "/foo")))
(call-with-output-file script-file-name
(lambda (port)
(format port script-contents)))
(chmod script-file-name #o777)
(wrap-script script-file-name
#:guile "MYGUILE"
`("GUIX_FOO" prefix ("/some/path"
"/some/other/path")))
(let ((str (call-with-input-file script-file-name get-string-all)))
(with-directory-excursion directory
(delete-file "foo"))
str))))))
(test-assert "wrap-script, raises condition"
(call-with-temporary-directory
(lambda (directory)
(let ((script-file-name (string-append directory "/foo")))
(call-with-output-file script-file-name
(lambda (port)
(format port "This is not a script")))
(chmod script-file-name #o777)
(guard (c ((wrap-error? c) #t))
(wrap-script script-file-name
#:guile "MYGUILE"
`("GUIX_FOO" prefix ("/some/path"
"/some/other/path")))
#f)))))
(test-equal "substitute*, text contains a NUL byte, UTF-8"
"c\0d"
(with-fluids ((%default-port-encoding "UTF-8")
(%default-port-conversion-strategy 'error))
;; The GNU libc is locale sensitive. Depending on the value of LANG, the
;; test could fail with "string contains #\\nul character: ~S" or "cannot
;; convert wide string to output locale".
(setlocale LC_ALL "en_US.UTF-8")
(call-with-temporary-output-file
(lambda (file port)
(format port "a\0b")
(flush-output-port port)
(substitute* file
(("a") "c")
(("b") "d"))
(with-input-from-file file
(lambda _
(get-string-all (current-input-port))))))))
(test-equal "search-input-file: exception if not found"
`((path)
(file . "does-not-exist"))
(guard (e ((search-error? e)
`((path . ,(search-error-path e))
(file . ,(search-error-file e)))))
(search-input-file '() "does-not-exist")))
(test-equal "search-input-file: can find if existent"
(which "guile")
(search-input-file
`(("guile/bin" . ,(dirname (which "guile"))))
"guile"))
(test-equal "search-input-file: can search in multiple directories"
(which "guile")
(call-with-temporary-directory
(lambda (directory)
(search-input-file
`(("irrelevant" . ,directory)
("guile/bin" . ,(dirname (which "guile"))))
"guile"))))
(test-end)