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-#!@BASH@
-# -*- mode: scheme; coding: utf-8; -*-
-
-# XXX: We have to go through Bash because there's no command-line switch to
-# augment %load-compiled-path, and because of the silly 127-byte limit for
-# the shebang line in Linux.
-# Use `load-compiled' because `load' (and `-l') doesn't otherwise load our
-# .go file (see <http://bugs.gnu.org/12519>).
-# Unset 'GUILE_LOAD_COMPILED_PATH' to make sure we do not stumble upon
-# incompatible .go files. See
-# <https://lists.gnu.org/archive/html/guile-devel/2016-03/msg00000.html>.
-
-unset GUILE_LOAD_COMPILED_PATH
-main="(@ (gnu build-support ld-wrapper) ld-wrapper)"
-exec @GUILE@ -c "(load-compiled \"@SELF@.go\") (apply $main (cdr (command-line)))" "$@"
-!#
-;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
-;;; Copyright © 2020 Marius Bakke <mbakke@fastmail.com>
-;;;
-;;; 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 (gnu build-support ld-wrapper)
- #:use-module (srfi srfi-1)
- #:use-module (ice-9 match)
- #:autoload (ice-9 rdelim) (read-delimited)
- #:export (ld-wrapper))
-
-;;; Commentary:
-;;;
-;;; This is a wrapper for the linker. Its purpose is to inspect the -L and
-;;; -l switches passed to the linker, add corresponding -rpath arguments, and
-;;; invoke the actual linker with this new set of arguments.
-;;;
-;;; The alternatives to this hack would be:
-;;;
-;;; 1. Using $LD_RUN_PATH. However, that would tend to include more than
-;;; needed in the RPATH; for instance, given a package with `libfoo' as
-;;; an input, all its binaries would have libfoo in their RPATH,
-;;; regardless of whether they actually NEED it.
-;;;
-;;; 2. Use a GCC "lib" spec string such as `%{L*:-rpath %*}', which adds a
-;;; `-rpath LIBDIR' argument for each occurrence of `-L LIBDIR'.
-;;; However, this doesn't work when $LIBRARY_PATH is used, because the
-;;; additional `-L' switches are not matched by the above rule, because
-;;; the rule only matches explicit user-provided switches. See
-;;; <http://gcc.gnu.org/ml/gcc-help/2012-09/msg00110.html> for details.
-;;;
-;;; As a bonus, this wrapper checks for "impurities"--i.e., references to
-;;; libraries outside the store.
-;;;
-;;; Code:
-
-(define %real-ld
- ;; Name of the linker that we wrap.
- "@LD@")
-
-(define %store-directory
- ;; File name of the store.
- (or (getenv "NIX_STORE") "/gnu/store"))
-
-(define %temporary-directory
- ;; Temporary directory.
- (or (getenv "TMPDIR") "/tmp"))
-
-(define %build-directory
- ;; Top build directory when run from a builder.
- (getenv "NIX_BUILD_TOP"))
-
-(define %allow-impurities?
- ;; Whether to allow references to libraries outside the store.
- ;; Allow them by default for convenience.
- (let ((value (getenv "GUIX_LD_WRAPPER_ALLOW_IMPURITIES")))
- (or (not value)
- (let ((value (string-downcase value)))
- (cond ((member value '("yes" "y" "t" "true" "1"))
- #t)
- ((member value '("no" "n" "f" "false" "0"))
- #f)
- (else
- (format (current-error-port)
- "ld-wrapper: ~s: invalid value for \
-'GUIX_LD_WRAPPER_ALLOW_IMPURITIES'~%"
- value)))))))
-
-(define %debug?
- ;; Whether to emit debugging output.
- (getenv "GUIX_LD_WRAPPER_DEBUG"))
-
-(define %disable-rpath?
- ;; Whether to disable automatic '-rpath' addition.
- (getenv "GUIX_LD_WRAPPER_DISABLE_RPATH"))
-
-(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) (= errno ENOENT))
- (values #f file)
- (apply throw args))))))
- (lambda (success? target)
- (if success?
- (loop (absolute target) (+ depth 1))
- file))))))
-
-(define (pure-file-name? file)
- ;; Return #t when FILE is the name of a file either within the store
- ;; (possibly via a symlink) or within the build directory.
- (let ((file (readlink* file)))
- (or (not (string-prefix? "/" file))
- (string-prefix? %store-directory file)
- (string-prefix? %temporary-directory file)
- (and %build-directory
- (string-prefix? %build-directory file)))))
-
-(define (store-file-name? file)
- ;; Return #t when FILE is a store file, possibly indirectly.
- (string-prefix? %store-directory (readlink* file)))
-
-(define (shared-library? file)
- ;; Return #t when FILE denotes a shared library.
- (or (string-suffix? ".so" file)
- (let ((index (string-contains file ".so.")))
- ;; Since we cannot use regexps during bootstrap, roll our own.
- (and index
- (string-every (char-set-union (char-set #\.) char-set:digit)
- (string-drop file (+ index 3)))))))
-
-(define (library-search-path args)
- ;; Return the library search path as a list of directory names. The GNU ld
- ;; manual notes that "[a]ll `-L' options apply to all `-l' options,
- ;; regardless of the order in which the options appear", so we must compute
- ;; the search path independently of the -l options.
- (let loop ((args args)
- (path '()))
- (match args
- (()
- (reverse path))
- (("-L" directory . rest)
- (loop rest (cons directory path)))
- ((argument . rest)
- (if (string-prefix? "-L" argument) ;augment the search path
- (loop rest
- (cons (string-drop argument 2) path))
- (loop rest path))))))
-
-(define (library-files-linked args library-path)
- ;; Return the absolute file names of shared libraries explicitly linked
- ;; against via `-l' or with an absolute file name in ARGS, looking them up
- ;; in LIBRARY-PATH.
- (define files+args
- (fold (lambda (argument result)
- (match result
- ((library-files ((and flag
- (or "-dynamic-linker" "-plugin"))
- . rest))
- ;; When passed '-dynamic-linker ld.so', ignore 'ld.so'; when
- ;; passed '-plugin liblto_plugin.so', ignore
- ;; 'liblto_plugin.so'. See <http://bugs.gnu.org/20102>.
- (list library-files
- (cons* argument flag rest)))
- ((library-files previous-args)
- (cond ((string-prefix? "-l" argument) ;add library
- (let* ((lib (string-append "lib"
- (string-drop argument 2)
- ".so"))
- (full (search-path library-path lib)))
- (list (if full
- (cons full library-files)
- library-files)
- (cons argument previous-args))))
- ((and (string-prefix? %store-directory argument)
- (shared-library? argument)) ;add library
- (list (cons argument library-files)
- (cons argument previous-args)))
- (else
- (list library-files
- (cons argument previous-args)))))))
- (list '() '())
- args))
-
- (match files+args
- ((files arguments)
- (reverse files))))
-
-(define (rpath-arguments library-files)
- ;; Return the `-rpath' argument list for each of LIBRARY-FILES, a list of
- ;; absolute file names.
- (fold-right (lambda (file args)
- ;; Add '-rpath' if and only if FILE is in the store; we don't
- ;; want to add '-rpath' for files under %BUILD-DIRECTORY or
- ;; %TEMPORARY-DIRECTORY because that could leak to installed
- ;; files.
- (cond ((and (not %disable-rpath?)
- (store-file-name? file))
- (cons* "-rpath" (dirname file) args))
- ((or %allow-impurities?
- (pure-file-name? file))
- args)
- (else
- (begin
- (format (current-error-port)
- "ld-wrapper: error: attempt to use \
-library outside of ~a: ~s~%"
- %store-directory file)
- (exit 1)))))
- '()
- library-files))
-
-(define (expand-arguments args)
- ;; Expand ARGS such that "response file" arguments, such as "@args.txt", are
- ;; expanded (info "(gcc) Overall Options").
- (define (response-file-arguments file)
- (define (tokenize port)
- ;; Return a list of all strings found in PORT. Quote characters are removed,
- ;; but whitespaces within quoted strings are preserved.
- (let loop ((words '()))
- (let* ((word (read-delimited " '\"" port 'split))
- (token (car word))
- (delim (cdr word)))
- (if (eof-object? delim)
- (reverse words)
- (case delim
- ((#\") (loop (cons (read-delimited "\"" port) words)))
- ((#\') (loop (cons (read-delimited "'" port) words)))
- ((#\ ) (if (> 0 (string-length token))
- (loop (cons token words))
- (loop words)))
- (else (loop words)))))))
-
- (when %debug?
- (format (current-error-port)
- "ld-wrapper: attempting to read arguments from '~a'~%" file))
-
- (call-with-input-file file tokenize))
-
- (define result
- (fold-right (lambda (arg result)
- (if (string-prefix? "@" arg)
- (let ((file (string-drop arg 1)))
- (append (catch 'system-error
- (lambda ()
- (response-file-arguments file))
- (lambda args
- ;; FILE doesn't exist or cannot be read so
- ;; leave ARG as is.
- (list arg)))
- result))
- (cons arg result)))
- '()
- args))
-
- ;; If there are "@" arguments in RESULT *and* we can expand them (they don't
- ;; refer to nonexistent files), then recurse.
- (if (equal? result args)
- result
- (expand-arguments result)))
-
-(define (ld-wrapper . args)
- ;; Invoke the real `ld' with ARGS, augmented with `-rpath' switches.
- (let* ((args (expand-arguments args))
- (path (library-search-path args))
- (libs (library-files-linked args path))
- (args (append args (rpath-arguments libs))))
- (when %debug?
- (format (current-error-port)
- "ld-wrapper: library search path: ~s~%" path)
- (format (current-error-port)
- "ld-wrapper: libraries linked: ~s~%" libs)
- (format (current-error-port)
- "ld-wrapper: invoking `~a' with ~s~%"
- %real-ld args)
- (force-output (current-error-port)))
- (apply execl %real-ld (basename %real-ld) args)))
-
-;;; ld-wrapper.scm ends here
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