819 lines
30 KiB
Scheme
819 lines
30 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
||
;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
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||
;;; Copyright © 2013, 2014, 2015 Mark H Weaver <mhw@netris.org>
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;;; Copyright © 2014 Eric Bavier <bavier@member.fsf.org>
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;;; Copyright © 2014 Ian Denhardt <ian@zenhack.net>
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||
;;; Copyright © 2016 Mathieu Lirzin <mthl@gnu.org>
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||
;;; Copyright © 2015 David Thompson <davet@gnu.org>
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||
;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
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;;; Copyright © 2018 Marius Bakke <mbakke@fastmail.com>
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||
;;;
|
||
;;; This file is part of GNU Guix.
|
||
;;;
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||
;;; 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
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||
;;; GNU General Public License for more details.
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||
;;;
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;;; You should have received a copy of the GNU General Public License
|
||
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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||
(define-module (guix utils)
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#:use-module (guix config)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-9)
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#:use-module (srfi srfi-11)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-35)
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#:use-module (srfi srfi-39)
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#:use-module (ice-9 binary-ports)
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||
#:use-module (ice-9 ftw)
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#:autoload (rnrs io ports) (make-custom-binary-input-port)
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#:use-module ((rnrs bytevectors) #:select (bytevector-u8-set!))
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#:use-module (guix memoization)
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#:use-module ((guix build utils) #:select (dump-port mkdir-p delete-file-recursively))
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#:use-module ((guix build syscalls) #:select (mkdtemp! fdatasync))
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#:use-module (ice-9 format)
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#:autoload (ice-9 popen) (open-pipe*)
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#:autoload (ice-9 rdelim) (read-line)
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#:use-module (ice-9 regex)
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||
#:use-module (ice-9 match)
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#:use-module (ice-9 format)
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#:use-module ((ice-9 iconv) #:prefix iconv:)
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#:use-module (system foreign)
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#:re-export (memoize) ; for backwards compatibility
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#:export (strip-keyword-arguments
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||
default-keyword-arguments
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||
substitute-keyword-arguments
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||
ensure-keyword-arguments
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||
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||
current-source-directory
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||
|
||
<location>
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||
location
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||
location?
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||
location-file
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||
location-line
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||
location-column
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||
source-properties->location
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location->source-properties
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&error-location
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||
error-location?
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error-location
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||
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&fix-hint
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fix-hint?
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condition-fix-hint
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||
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nix-system->gnu-triplet
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gnu-triplet->nix-system
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%current-system
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%current-target-system
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package-name->name+version
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target-mingw?
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target-arm32?
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target-64bit?
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version-compare
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version>?
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version>=?
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version-prefix
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||
version-major+minor
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||
version-major
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guile-version>?
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version-prefix?
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||
string-replace-substring
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||
arguments-from-environment-variable
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||
file-extension
|
||
file-sans-extension
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||
compressed-file?
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||
switch-symlinks
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||
call-with-temporary-output-file
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||
call-with-temporary-directory
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||
with-atomic-file-output
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||
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||
config-directory
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||
cache-directory
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||
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||
readlink*
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||
edit-expression
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||
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filtered-port
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||
compressed-port
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||
decompressed-port
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||
call-with-decompressed-port
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||
compressed-output-port
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||
call-with-compressed-output-port
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||
canonical-newline-port))
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||
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||
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;;;
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||
;;; Filtering & pipes.
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||
;;;
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||
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||
(define (filtered-port command input)
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"Return an input port where data drained from INPUT is filtered through
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COMMAND (a list). In addition, return a list of PIDs that the caller must
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wait. When INPUT is a file port, it must be unbuffered; otherwise, any
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||
buffered data is lost."
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||
(let loop ((input input)
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(pids '()))
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(if (file-port? input)
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||
(match (pipe)
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||
((in . out)
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||
(match (primitive-fork)
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||
(0
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||
(dynamic-wind
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||
(const #f)
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||
(lambda ()
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||
(close-port in)
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||
(close-port (current-input-port))
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||
(dup2 (fileno input) 0)
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||
(close-port (current-output-port))
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||
(dup2 (fileno out) 1)
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||
(catch 'system-error
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||
(lambda ()
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||
(apply execl (car command) command))
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||
(lambda args
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||
(format (current-error-port)
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||
"filtered-port: failed to execute '~{~a ~}': ~a~%"
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||
command (strerror (system-error-errno args))))))
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||
(lambda ()
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||
(primitive-_exit 1))))
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||
(child
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||
(close-port out)
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||
(values in (cons child pids))))))
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||
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||
;; INPUT is not a file port, so fork just for the sake of tunneling it
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;; through a file port.
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||
(match (pipe)
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||
((in . out)
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||
(match (primitive-fork)
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||
(0
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||
(dynamic-wind
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||
(const #t)
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||
(lambda ()
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||
(close-port in)
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||
(dump-port input out))
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||
(lambda ()
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||
(close-port input)
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||
(false-if-exception (close out))
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||
(primitive-_exit 0))))
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||
(child
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||
(close-port input)
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||
(close-port out)
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||
(loop in (cons child pids)))))))))
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||
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||
(define (decompressed-port compression input)
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||
"Return an input port where INPUT is decompressed according to COMPRESSION,
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||
a symbol such as 'xz."
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||
(match compression
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||
((or #f 'none) (values input '()))
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||
('bzip2 (filtered-port `(,%bzip2 "-dc") input))
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||
('xz (filtered-port `(,%xz "-dc") input))
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('gzip (filtered-port `(,%gzip "-dc") input))
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(else (error "unsupported compression scheme" compression))))
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||
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||
(define (compressed-port compression input)
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||
"Return an input port where INPUT is decompressed according to COMPRESSION,
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||
a symbol such as 'xz."
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||
(match compression
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||
((or #f 'none) (values input '()))
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||
('bzip2 (filtered-port `(,%bzip2 "-c") input))
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||
('xz (filtered-port `(,%xz "-c") input))
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||
('gzip (filtered-port `(,%gzip "-c") input))
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||
(else (error "unsupported compression scheme" compression))))
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||
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||
(define (call-with-decompressed-port compression port proc)
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||
"Call PROC with a wrapper around PORT, a file port, that decompresses data
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read from PORT according to COMPRESSION, a symbol such as 'xz."
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(let-values (((decompressed pids)
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(decompressed-port compression port)))
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(dynamic-wind
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(const #f)
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(lambda ()
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||
(proc decompressed))
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||
(lambda ()
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||
(close-port decompressed)
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||
(unless (every (compose zero? cdr waitpid) pids)
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||
(error "decompressed-port failure" pids))))))
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||
|
||
(define (filtered-output-port command output)
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||
"Return an output port. Data written to that port is filtered through
|
||
COMMAND and written to OUTPUT, an output file port. In addition, return a
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||
list of PIDs to wait for. OUTPUT must be unbuffered; otherwise, any buffered
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||
data is lost."
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||
(match (pipe)
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||
((in . out)
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||
(match (primitive-fork)
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||
(0
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||
(dynamic-wind
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||
(const #f)
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||
(lambda ()
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||
(close-port out)
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||
(close-port (current-input-port))
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||
(dup2 (fileno in) 0)
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||
(close-port (current-output-port))
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||
(dup2 (fileno output) 1)
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||
(catch 'system-error
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||
(lambda ()
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||
(apply execl (car command) command))
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||
(lambda args
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||
(format (current-error-port)
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||
"filtered-output-port: failed to execute '~{~a ~}': ~a~%"
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||
command (strerror (system-error-errno args))))))
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||
(lambda ()
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||
(primitive-_exit 1))))
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||
(child
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||
(close-port in)
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||
(values out (list child)))))))
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||
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||
(define* (compressed-output-port compression output
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||
#:key (options '()))
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||
"Return an output port whose input is compressed according to COMPRESSION,
|
||
a symbol such as 'xz, and then written to OUTPUT. In addition return a list
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||
of PIDs to wait for. OPTIONS is a list of strings passed to the compression
|
||
program--e.g., '(\"--fast\")."
|
||
(match compression
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||
((or #f 'none) (values output '()))
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||
('bzip2 (filtered-output-port `(,%bzip2 "-c" ,@options) output))
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||
('xz (filtered-output-port `(,%xz "-c" ,@options) output))
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||
('gzip (filtered-output-port `(,%gzip "-c" ,@options) output))
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||
(else (error "unsupported compression scheme" compression))))
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||
|
||
(define* (call-with-compressed-output-port compression port proc
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||
#:key (options '()))
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||
"Call PROC with a wrapper around PORT, a file port, that compresses data
|
||
that goes to PORT according to COMPRESSION, a symbol such as 'xz. OPTIONS is
|
||
a list of command-line arguments passed to the compression program."
|
||
(let-values (((compressed pids)
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||
(compressed-output-port compression port
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||
#:options options)))
|
||
(dynamic-wind
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||
(const #f)
|
||
(lambda ()
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||
(proc compressed))
|
||
(lambda ()
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||
(close-port compressed)
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||
(unless (every (compose zero? cdr waitpid) pids)
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||
(error "compressed-output-port failure" pids))))))
|
||
|
||
(define* (edit-expression source-properties proc #:key (encoding "UTF-8"))
|
||
"Edit the expression specified by SOURCE-PROPERTIES using PROC, which should
|
||
be a procedure that takes the original expression in string and returns a new
|
||
one. ENCODING will be used to interpret all port I/O, it default to UTF-8.
|
||
This procedure returns #t on success."
|
||
(with-fluids ((%default-port-encoding encoding))
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||
(let* ((file (assq-ref source-properties 'filename))
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||
(line (assq-ref source-properties 'line))
|
||
(column (assq-ref source-properties 'column))
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||
(in (open-input-file file))
|
||
;; The start byte position of the expression.
|
||
(start (begin (while (not (and (= line (port-line in))
|
||
(= column (port-column in))))
|
||
(when (eof-object? (read-char in))
|
||
(error (format #f "~a: end of file~%" in))))
|
||
(ftell in)))
|
||
;; The end byte position of the expression.
|
||
(end (begin (read in) (ftell in))))
|
||
(seek in 0 SEEK_SET) ; read from the beginning of the file.
|
||
(let* ((pre-bv (get-bytevector-n in start))
|
||
;; The expression in string form.
|
||
(str (iconv:bytevector->string
|
||
(get-bytevector-n in (- end start))
|
||
(port-encoding in)))
|
||
(post-bv (get-bytevector-all in))
|
||
(str* (proc str)))
|
||
;; Verify the edited expression is still a scheme expression.
|
||
(call-with-input-string str* read)
|
||
;; Update the file with edited expression.
|
||
(with-atomic-file-output file
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(lambda (out)
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(put-bytevector out pre-bv)
|
||
(display str* out)
|
||
;; post-bv maybe the end-of-file object.
|
||
(when (not (eof-object? post-bv))
|
||
(put-bytevector out post-bv))
|
||
#t))))))
|
||
|
||
|
||
;;;
|
||
;;; Keyword arguments.
|
||
;;;
|
||
|
||
(define (strip-keyword-arguments keywords args)
|
||
"Remove all of the keyword arguments listed in KEYWORDS from ARGS."
|
||
(let loop ((args args)
|
||
(result '()))
|
||
(match args
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||
(()
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||
(reverse result))
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||
(((? keyword? kw) arg . rest)
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||
(loop rest
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||
(if (memq kw keywords)
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||
result
|
||
(cons* arg kw result))))
|
||
((head . tail)
|
||
(loop tail (cons head result))))))
|
||
|
||
(define (default-keyword-arguments args defaults)
|
||
"Return ARGS augmented with any keyword/value from DEFAULTS for
|
||
keywords not already present in ARGS."
|
||
(let loop ((defaults defaults)
|
||
(args args))
|
||
(match defaults
|
||
((kw value rest ...)
|
||
(loop rest
|
||
(if (memq kw args)
|
||
args
|
||
(cons* kw value args))))
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||
(()
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||
args))))
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||
|
||
(define-syntax collect-default-args
|
||
(syntax-rules ()
|
||
((_)
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||
'())
|
||
((_ (_ _) rest ...)
|
||
(collect-default-args rest ...))
|
||
((_ (kw _ dflt) rest ...)
|
||
(cons* kw dflt (collect-default-args rest ...)))))
|
||
|
||
(define-syntax substitute-keyword-arguments
|
||
(syntax-rules ()
|
||
"Return a new list of arguments where the value for keyword arg KW is
|
||
replaced by EXP. EXP is evaluated in a context where VAR is bound to the
|
||
previous value of the keyword argument, or DFLT if given."
|
||
((_ original-args ((kw var dflt ...) exp) ...)
|
||
(let loop ((args (default-keyword-arguments
|
||
original-args
|
||
(collect-default-args (kw var dflt ...) ...)))
|
||
(before '()))
|
||
(match args
|
||
((kw var rest (... ...))
|
||
(loop rest (cons* exp kw before)))
|
||
...
|
||
((x rest (... ...))
|
||
(loop rest (cons x before)))
|
||
(()
|
||
(reverse before)))))))
|
||
|
||
(define (delkw kw lst)
|
||
"Remove KW and its associated value from LST, a keyword/value list such
|
||
as '(#:foo 1 #:bar 2)."
|
||
(let loop ((lst lst)
|
||
(result '()))
|
||
(match lst
|
||
(()
|
||
(reverse result))
|
||
((kw? value rest ...)
|
||
(if (eq? kw? kw)
|
||
(append (reverse result) rest)
|
||
(loop rest (cons* value kw? result)))))))
|
||
|
||
(define (ensure-keyword-arguments args kw/values)
|
||
"Force the keywords arguments KW/VALUES in the keyword argument list ARGS.
|
||
For instance:
|
||
|
||
(ensure-keyword-arguments '(#:foo 2) '(#:foo 2))
|
||
=> (#:foo 2)
|
||
|
||
(ensure-keyword-arguments '(#:foo 2) '(#:bar 3))
|
||
=> (#:foo 2 #:bar 3)
|
||
|
||
(ensure-keyword-arguments '(#:foo 2) '(#:bar 3 #:foo 42))
|
||
=> (#:foo 42 #:bar 3)
|
||
"
|
||
(let loop ((args args)
|
||
(kw/values kw/values)
|
||
(result '()))
|
||
(match args
|
||
(()
|
||
(append (reverse result) kw/values))
|
||
((kw value rest ...)
|
||
(match (memq kw kw/values)
|
||
((_ value . _)
|
||
(loop rest (delkw kw kw/values) (cons* value kw result)))
|
||
(#f
|
||
(loop rest kw/values (cons* value kw result))))))))
|
||
|
||
|
||
;;;
|
||
;;; System strings.
|
||
;;;
|
||
|
||
(define* (nix-system->gnu-triplet
|
||
#:optional (system (%current-system)) (vendor "unknown"))
|
||
"Return a guess of the GNU triplet corresponding to Nix system
|
||
identifier SYSTEM."
|
||
(match system
|
||
("armhf-linux"
|
||
(string-append "arm-" vendor "-linux-gnueabihf"))
|
||
(_
|
||
(let* ((dash (string-index system #\-))
|
||
(arch (substring system 0 dash))
|
||
(os (substring system (+ 1 dash))))
|
||
(string-append arch
|
||
"-" vendor "-"
|
||
(if (string=? os "linux")
|
||
"linux-gnu"
|
||
os))))))
|
||
|
||
(define (gnu-triplet->nix-system triplet)
|
||
"Return the Nix system type corresponding to TRIPLET, a GNU triplet as
|
||
returned by `config.guess'."
|
||
(let ((triplet (cond ((string-match "^i[345]86-(.*)$" triplet)
|
||
=>
|
||
(lambda (m)
|
||
(string-append "i686-" (match:substring m 1))))
|
||
(else triplet))))
|
||
(cond ((string-match "^arm[^-]*-([^-]+-)?linux-gnueabihf" triplet)
|
||
"armhf-linux")
|
||
((string-match "^([^-]+)-([^-]+-)?linux-gnu.*" triplet)
|
||
=>
|
||
(lambda (m)
|
||
;; Nix omits `-gnu' for GNU/Linux.
|
||
(string-append (match:substring m 1) "-linux")))
|
||
((string-match "^([^-]+)-([^-]+-)?([[:alpha:]]+)([0-9]+\\.?)*$" triplet)
|
||
=>
|
||
(lambda (m)
|
||
;; Nix strip the version number from names such as `gnu0.3',
|
||
;; `darwin10.2.0', etc., and always strips the vendor part.
|
||
(string-append (match:substring m 1) "-"
|
||
(match:substring m 3))))
|
||
(else triplet))))
|
||
|
||
(define %current-system
|
||
;; System type as expected by Nix, usually ARCHITECTURE-KERNEL.
|
||
;; By default, this is equal to (gnu-triplet->nix-system %host-type).
|
||
(make-parameter %system))
|
||
|
||
(define %current-target-system
|
||
;; Either #f or a GNU triplet representing the target system we are
|
||
;; cross-building to.
|
||
(make-parameter #f))
|
||
|
||
(define* (package-name->name+version spec
|
||
#:optional (delimiter #\@))
|
||
"Given SPEC, a package name like \"foo@0.9.1b\", return two values: \"foo\"
|
||
and \"0.9.1b\". When the version part is unavailable, SPEC and #f are
|
||
returned. Both parts must not contain any '@'. Optionally, DELIMITER can be
|
||
a character other than '@'."
|
||
(match (string-rindex spec delimiter)
|
||
(#f (values spec #f))
|
||
(idx (values (substring spec 0 idx)
|
||
(substring spec (1+ idx))))))
|
||
|
||
(define* (target-mingw? #:optional (target (%current-target-system)))
|
||
(and target
|
||
(string-suffix? "-mingw32" target)))
|
||
|
||
(define (target-arm32?)
|
||
(string-prefix? "arm" (or (%current-target-system) (%current-system))))
|
||
|
||
(define (target-64bit?)
|
||
(let ((system (or (%current-target-system) (%current-system))))
|
||
(any (cut string-prefix? <> system) '("x86_64" "aarch64" "mips64" "ppc64"))))
|
||
|
||
(define version-compare
|
||
(let ((strverscmp
|
||
(let ((sym (or (dynamic-func "strverscmp" (dynamic-link))
|
||
(error "could not find `strverscmp' (from GNU libc)"))))
|
||
(pointer->procedure int sym (list '* '*)))))
|
||
(lambda (a b)
|
||
"Return '> when A denotes a newer version than B,
|
||
'< when A denotes a older version than B,
|
||
or '= when they denote equal versions."
|
||
(let ((result (strverscmp (string->pointer a) (string->pointer b))))
|
||
(cond ((positive? result) '>)
|
||
((negative? result) '<)
|
||
(else '=))))))
|
||
|
||
(define (version-prefix version-string num-parts)
|
||
"Truncate version-string to the first num-parts components of the version.
|
||
For example, (version-prefix \"2.1.47.4.23\" 3) returns \"2.1.47\""
|
||
(string-join (take (string-split version-string #\.) num-parts) "."))
|
||
|
||
|
||
(define (version-major+minor version-string)
|
||
"Return \"<major>.<minor>\", where major and minor are the major and
|
||
minor version numbers from version-string."
|
||
(version-prefix version-string 2))
|
||
|
||
(define (version-major version-string)
|
||
"Return the major version number as string from the version-string."
|
||
(version-prefix version-string 1))
|
||
|
||
(define (version>? a b)
|
||
"Return #t when A denotes a version strictly newer than B."
|
||
(eq? '> (version-compare a b)))
|
||
|
||
(define (version>=? a b)
|
||
"Return #t when A denotes a version newer or equal to B."
|
||
(case (version-compare a b)
|
||
((> =) #t)
|
||
(else #f)))
|
||
|
||
(define (guile-version>? str)
|
||
"Return #t if the running Guile version is greater than STR."
|
||
;; Note: Using (version>? (version) "2.0.5") or similar doesn't work,
|
||
;; because the result of (version) can have a prefix, like "2.0.5-deb1".
|
||
(version>? (string-append (major-version) "."
|
||
(minor-version) "."
|
||
(micro-version))
|
||
str))
|
||
|
||
(define version-prefix?
|
||
(let ((not-dot (char-set-complement (char-set #\.))))
|
||
(lambda (v1 v2)
|
||
"Return true if V1 is a version prefix of V2:
|
||
|
||
(version-prefix? \"4.1\" \"4.16.2\") => #f
|
||
(version-prefix? \"4.1\" \"4.1.2\") => #t
|
||
"
|
||
(define (list-prefix? lst1 lst2)
|
||
(match lst1
|
||
(() #t)
|
||
((head1 tail1 ...)
|
||
(match lst2
|
||
(() #f)
|
||
((head2 tail2 ...)
|
||
(and (equal? head1 head2)
|
||
(list-prefix? tail1 tail2)))))))
|
||
|
||
(list-prefix? (string-tokenize v1 not-dot)
|
||
(string-tokenize v2 not-dot)))))
|
||
|
||
(define (file-extension file)
|
||
"Return the extension of FILE or #f if there is none."
|
||
(let ((dot (string-rindex file #\.)))
|
||
(and dot (substring file (+ 1 dot) (string-length file)))))
|
||
|
||
(define (file-sans-extension file)
|
||
"Return the substring of FILE without its extension, if any."
|
||
(let ((dot (string-rindex file #\.)))
|
||
(if dot
|
||
(substring file 0 dot)
|
||
file)))
|
||
|
||
(define (compressed-file? file)
|
||
"Return true if FILE denotes a compressed file."
|
||
(->bool (member (file-extension file)
|
||
'("gz" "bz2" "xz" "lz" "lzma" "tgz" "tbz2" "zip"))))
|
||
|
||
(define (switch-symlinks link target)
|
||
"Atomically switch LINK, a symbolic link, to point to TARGET. Works
|
||
both when LINK already exists and when it does not."
|
||
(let ((pivot (string-append link ".new")))
|
||
(symlink target pivot)
|
||
(rename-file pivot link)))
|
||
|
||
(define* (string-replace-substring str substr replacement
|
||
#:optional
|
||
(start 0)
|
||
(end (string-length str)))
|
||
"Replace all occurrences of SUBSTR in the START--END range of STR by
|
||
REPLACEMENT."
|
||
(match (string-length substr)
|
||
(0
|
||
(error "string-replace-substring: empty substring"))
|
||
(substr-length
|
||
(let loop ((start start)
|
||
(pieces (list (substring str 0 start))))
|
||
(match (string-contains str substr start end)
|
||
(#f
|
||
(string-concatenate-reverse
|
||
(cons (substring str start) pieces)))
|
||
(index
|
||
(loop (+ index substr-length)
|
||
(cons* replacement
|
||
(substring str start index)
|
||
pieces))))))))
|
||
|
||
(define (arguments-from-environment-variable variable)
|
||
"Retrieve value of environment variable denoted by string VARIABLE in the
|
||
form of a list of strings (`char-set:graphic' tokens) suitable for consumption
|
||
by `args-fold', if VARIABLE is defined, otherwise return an empty list."
|
||
(let ((env (getenv variable)))
|
||
(if env
|
||
(string-tokenize env char-set:graphic)
|
||
'())))
|
||
|
||
(define (call-with-temporary-output-file proc)
|
||
"Call PROC with a name of a temporary file and open output port to that
|
||
file; close the file and delete it when leaving the dynamic extent of this
|
||
call."
|
||
(let* ((directory (or (getenv "TMPDIR") "/tmp"))
|
||
(template (string-append directory "/guix-file.XXXXXX"))
|
||
(out (mkstemp! template)))
|
||
(dynamic-wind
|
||
(lambda ()
|
||
#t)
|
||
(lambda ()
|
||
(proc template out))
|
||
(lambda ()
|
||
(false-if-exception (close out))
|
||
(false-if-exception (delete-file template))))))
|
||
|
||
(define (call-with-temporary-directory proc)
|
||
"Call PROC with a name of a temporary directory; close the directory and
|
||
delete it when leaving the dynamic extent of this call."
|
||
(let* ((directory (or (getenv "TMPDIR") "/tmp"))
|
||
(template (string-append directory "/guix-directory.XXXXXX"))
|
||
(tmp-dir (mkdtemp! template)))
|
||
(dynamic-wind
|
||
(const #t)
|
||
(lambda ()
|
||
(proc tmp-dir))
|
||
(lambda ()
|
||
(false-if-exception (delete-file-recursively tmp-dir))))))
|
||
|
||
(define (with-atomic-file-output file proc)
|
||
"Call PROC with an output port for the file that is going to replace FILE.
|
||
Upon success, FILE is atomically replaced by what has been written to the
|
||
output port, and PROC's result is returned."
|
||
(let* ((template (string-append file ".XXXXXX"))
|
||
(out (mkstemp! template)))
|
||
(with-throw-handler #t
|
||
(lambda ()
|
||
(let ((result (proc out)))
|
||
(fdatasync out)
|
||
(close-port out)
|
||
(rename-file template file)
|
||
result))
|
||
(lambda (key . args)
|
||
(false-if-exception (delete-file template))
|
||
(close-port out)))))
|
||
|
||
(define* (xdg-directory variable suffix #:key (ensure? #t))
|
||
"Return the name of the XDG directory that matches VARIABLE and SUFFIX,
|
||
after making sure that it exists if ENSURE? is true. VARIABLE is an
|
||
environment variable name like \"XDG_CONFIG_HOME\"; SUFFIX is a suffix like
|
||
\"/.config\". Honor the XDG specs,
|
||
<http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html>."
|
||
(let ((dir (and=> (or (getenv variable)
|
||
(and=> (or (getenv "HOME")
|
||
(passwd:dir (getpwuid (getuid))))
|
||
(cut string-append <> suffix)))
|
||
(cut string-append <> "/guix"))))
|
||
(when ensure?
|
||
(mkdir-p dir))
|
||
dir))
|
||
|
||
(define config-directory
|
||
(cut xdg-directory "XDG_CONFIG_HOME" "/.config" <...>))
|
||
|
||
(define cache-directory
|
||
(cut xdg-directory "XDG_CACHE_HOME" "/.cache" <...>))
|
||
|
||
(define (readlink* file)
|
||
"Call 'readlink' until the result is not a symlink."
|
||
(define %max-symlink-depth 50)
|
||
|
||
(let loop ((file file)
|
||
(depth 0))
|
||
(define (absolute target)
|
||
(if (absolute-file-name? target)
|
||
target
|
||
(string-append (dirname file) "/" target)))
|
||
|
||
(if (>= depth %max-symlink-depth)
|
||
file
|
||
(call-with-values
|
||
(lambda ()
|
||
(catch 'system-error
|
||
(lambda ()
|
||
(values #t (readlink file)))
|
||
(lambda args
|
||
(let ((errno (system-error-errno args)))
|
||
(if (or (= errno EINVAL))
|
||
(values #f file)
|
||
(apply throw args))))))
|
||
(lambda (success? target)
|
||
(if success?
|
||
(loop (absolute target) (+ depth 1))
|
||
file))))))
|
||
|
||
(define (canonical-newline-port port)
|
||
"Return an input port that wraps PORT such that all newlines consist
|
||
of a single carriage return."
|
||
(define (get-position)
|
||
(if (port-has-port-position? port) (port-position port) #f))
|
||
(define (set-position! position)
|
||
(if (port-has-set-port-position!? port)
|
||
(set-port-position! position port)
|
||
#f))
|
||
(define (close) (close-port port))
|
||
(define (read! bv start n)
|
||
(let loop ((count 0)
|
||
(byte (get-u8 port)))
|
||
(cond ((eof-object? byte) count)
|
||
((= count (- n 1))
|
||
(bytevector-u8-set! bv (+ start count) byte)
|
||
n)
|
||
;; XXX: consume all LFs even if not followed by CR.
|
||
((eqv? byte (char->integer #\return)) (loop count (get-u8 port)))
|
||
(else
|
||
(bytevector-u8-set! bv (+ start count) byte)
|
||
(loop (+ count 1) (get-u8 port))))))
|
||
(make-custom-binary-input-port "canonical-newline-port"
|
||
read!
|
||
get-position
|
||
set-position!
|
||
close))
|
||
|
||
;;;
|
||
;;; Source location.
|
||
;;;
|
||
|
||
(define absolute-dirname
|
||
;; Memoize to avoid repeated 'stat' storms from 'search-path'.
|
||
(mlambda (file)
|
||
"Return the absolute name of the directory containing FILE, or #f upon
|
||
failure."
|
||
(match (search-path %load-path file)
|
||
(#f #f)
|
||
((? string? file)
|
||
;; If there are relative names in %LOAD-PATH, FILE can be relative and
|
||
;; needs to be canonicalized.
|
||
(if (string-prefix? "/" file)
|
||
(dirname file)
|
||
(canonicalize-path (dirname file)))))))
|
||
|
||
(define-syntax current-source-directory
|
||
(lambda (s)
|
||
"Return the absolute name of the current directory, or #f if it could not
|
||
be determined."
|
||
(syntax-case s ()
|
||
((_)
|
||
(match (assq 'filename (or (syntax-source s) '()))
|
||
(('filename . (? string? file-name))
|
||
;; If %FILE-PORT-NAME-CANONICALIZATION is 'relative, then FILE-NAME
|
||
;; can be relative. In that case, we try to find out at run time
|
||
;; the absolute file name by looking at %LOAD-PATH; doing this at
|
||
;; run time rather than expansion time is necessary to allow files
|
||
;; to be moved on the file system.
|
||
(cond ((not file-name)
|
||
#f) ;raising an error would upset Geiser users
|
||
((string-prefix? "/" file-name)
|
||
(dirname file-name))
|
||
(else
|
||
#`(absolute-dirname #,file-name))))
|
||
(#f
|
||
#f))))))
|
||
|
||
;; A source location.
|
||
(define-record-type <location>
|
||
(make-location file line column)
|
||
location?
|
||
(file location-file) ; file name
|
||
(line location-line) ; 1-indexed line
|
||
(column location-column)) ; 0-indexed column
|
||
|
||
(define (location file line column)
|
||
"Return the <location> object for the given FILE, LINE, and COLUMN."
|
||
(and line column file
|
||
(make-location file line column)))
|
||
|
||
(define (source-properties->location loc)
|
||
"Return a location object based on the info in LOC, an alist as returned
|
||
by Guile's `source-properties', `frame-source', `current-source-location',
|
||
etc."
|
||
;; In accordance with the GCS, start line and column numbers at 1. Note
|
||
;; that unlike LINE and `port-column', COL is actually 1-indexed here...
|
||
(match loc
|
||
((('line . line) ('column . col) ('filename . file)) ;common case
|
||
(and file line col
|
||
(make-location file (+ line 1) col)))
|
||
(#f
|
||
#f)
|
||
(_
|
||
(let ((file (assq-ref loc 'filename))
|
||
(line (assq-ref loc 'line))
|
||
(col (assq-ref loc 'column)))
|
||
(location file (and line (+ line 1)) col)))))
|
||
|
||
(define (location->source-properties loc)
|
||
"Return the source property association list based on the info in LOC,
|
||
a location object."
|
||
`((line . ,(and=> (location-line loc) 1-))
|
||
(column . ,(location-column loc))
|
||
(filename . ,(location-file loc))))
|
||
|
||
(define-condition-type &error-location &error
|
||
error-location?
|
||
(location error-location)) ;<location>
|
||
|
||
(define-condition-type &fix-hint &condition
|
||
fix-hint?
|
||
(hint condition-fix-hint)) ;string
|
||
|
||
;;; Local Variables:
|
||
;;; eval: (put 'call-with-progress-reporter 'scheme-indent-function 1)
|
||
;;; End:
|