241 lines
9.4 KiB
Scheme
241 lines
9.4 KiB
Scheme
#!@BASH@
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# -*- mode: scheme; coding: utf-8; -*-
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# XXX: We have to go through Bash because there's no command-line switch to
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# augment %load-compiled-path, and because of the silly 127-byte limit for
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# the shebang line in Linux.
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# Use `load-compiled' because `load' (and `-l') doesn't otherwise load our
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# .go file (see <http://bugs.gnu.org/12519>).
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# Unset 'GUILE_LOAD_COMPILED_PATH' to make sure we do not stumble upon
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# incompatible .go files. See
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# <https://lists.gnu.org/archive/html/guile-devel/2016-03/msg00000.html>.
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unset GUILE_LOAD_COMPILED_PATH
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main="(@ (gnu build-support ld-wrapper) ld-wrapper)"
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exec @GUILE@ -c "(load-compiled \"@SELF@.go\") (apply $main (cdr (command-line)))" "$@"
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!#
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2012, 2013, 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; 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
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu build-support ld-wrapper)
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#:use-module (srfi srfi-1)
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#:use-module (ice-9 match)
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#:export (ld-wrapper))
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;;; Commentary:
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;;;
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;;; This is a wrapper for the linker. Its purpose is to inspect the -L and
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;;; -l switches passed to the linker, add corresponding -rpath arguments, and
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;;; invoke the actual linker with this new set of arguments.
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;;;
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;;; The alternatives to this hack would be:
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;;;
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;;; 1. Using $LD_RUN_PATH. However, that would tend to include more than
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;;; needed in the RPATH; for instance, given a package with `libfoo' as
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;;; an input, all its binaries would have libfoo in their RPATH,
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;;; regardless of whether they actually NEED it.
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;;;
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;;; 2. Use a GCC "lib" spec string such as `%{L*:-rpath %*}', which adds a
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;;; `-rpath LIBDIR' argument for each occurrence of `-L LIBDIR'.
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;;; However, this doesn't work when $LIBRARY_PATH is used, because the
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;;; additional `-L' switches are not matched by the above rule, because
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;;; the rule only matches explicit user-provided switches. See
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;;; <http://gcc.gnu.org/ml/gcc-help/2012-09/msg00110.html> for details.
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;;;
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;;; As a bonus, this wrapper checks for "impurities"--i.e., references to
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;;; libraries outside the store.
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;;;
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;;; Code:
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(define %real-ld
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;; Name of the linker that we wrap.
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"@LD@")
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(define %store-directory
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;; File name of the store.
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(or (getenv "NIX_STORE") "/gnu/store"))
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(define %temporary-directory
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;; Temporary directory.
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(or (getenv "TMPDIR") "/tmp"))
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(define %build-directory
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;; Top build directory when run from a builder.
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(getenv "NIX_BUILD_TOP"))
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(define %allow-impurities?
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;; Whether to allow references to libraries outside the store.
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(getenv "GUIX_LD_WRAPPER_ALLOW_IMPURITIES"))
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(define %debug?
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;; Whether to emit debugging output.
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(getenv "GUIX_LD_WRAPPER_DEBUG"))
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(define %disable-rpath?
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;; Whether to disable automatic '-rpath' addition.
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(getenv "GUIX_LD_WRAPPER_DISABLE_RPATH"))
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(define (readlink* file)
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;; Call 'readlink' until the result is not a symlink.
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(define %max-symlink-depth 50)
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(let loop ((file file)
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(depth 0))
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(define (absolute target)
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(if (absolute-file-name? target)
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target
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(string-append (dirname file) "/" target)))
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(if (>= depth %max-symlink-depth)
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file
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(call-with-values
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(lambda ()
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(catch 'system-error
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(lambda ()
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(values #t (readlink file)))
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(lambda args
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(let ((errno (system-error-errno args)))
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(if (or (= errno EINVAL) (= errno ENOENT))
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(values #f file)
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(apply throw args))))))
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(lambda (success? target)
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(if success?
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(loop (absolute target) (+ depth 1))
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file))))))
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(define (pure-file-name? file)
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;; Return #t when FILE is the name of a file either within the store
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;; (possibly via a symlink) or within the build directory.
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(let ((file (readlink* file)))
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(or (not (string-prefix? "/" file))
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(string-prefix? %store-directory file)
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(string-prefix? %temporary-directory file)
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(and %build-directory
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(string-prefix? %build-directory file)))))
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(define (store-file-name? file)
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;; Return #t when FILE is a store file, possibly indirectly.
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(string-prefix? %store-directory (readlink* file)))
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(define (shared-library? file)
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;; Return #t when FILE denotes a shared library.
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(or (string-suffix? ".so" file)
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(let ((index (string-contains file ".so.")))
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;; Since we cannot use regexps during bootstrap, roll our own.
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(and index
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(string-every (char-set-union (char-set #\.) char-set:digit)
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(string-drop file (+ index 3)))))))
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(define (library-search-path args)
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;; Return the library search path as a list of directory names. The GNU ld
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;; manual notes that "[a]ll `-L' options apply to all `-l' options,
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;; regardless of the order in which the options appear", so we must compute
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;; the search path independently of the -l options.
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(let loop ((args args)
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(path '()))
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(match args
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(()
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(reverse path))
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(("-L" directory . rest)
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(loop rest (cons directory path)))
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((argument . rest)
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(if (string-prefix? "-L" argument) ;augment the search path
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(loop rest
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(cons (string-drop argument 2) path))
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(loop rest path))))))
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(define (library-files-linked args library-path)
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;; Return the absolute file names of shared libraries explicitly linked
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;; against via `-l' or with an absolute file name in ARGS, looking them up
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;; in LIBRARY-PATH.
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(define files+args
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(fold (lambda (argument result)
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(match result
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((library-files ((and flag
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(or "-dynamic-linker" "-plugin"))
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. rest))
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;; When passed '-dynamic-linker ld.so', ignore 'ld.so'; when
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;; passed '-plugin liblto_plugin.so', ignore
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;; 'liblto_plugin.so'. See <http://bugs.gnu.org/20102>.
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(list library-files
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(cons* argument flag rest)))
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((library-files previous-args)
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(cond ((string-prefix? "-l" argument) ;add library
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(let* ((lib (string-append "lib"
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(string-drop argument 2)
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".so"))
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(full (search-path library-path lib)))
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(list (if full
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(cons full library-files)
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library-files)
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(cons argument previous-args))))
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((and (string-prefix? %store-directory argument)
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(shared-library? argument)) ;add library
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(list (cons argument library-files)
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(cons argument previous-args)))
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(else
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(list library-files
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(cons argument previous-args)))))))
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(list '() '())
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args))
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(match files+args
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((files arguments)
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(reverse files))))
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(define (rpath-arguments library-files)
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;; Return the `-rpath' argument list for each of LIBRARY-FILES, a list of
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;; absolute file names.
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(fold-right (lambda (file args)
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;; Add '-rpath' if and only if FILE is in the store; we don't
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;; want to add '-rpath' for files under %BUILD-DIRECTORY or
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;; %TEMPORARY-DIRECTORY because that could leak to installed
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;; files.
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(cond ((and (not %disable-rpath?)
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(store-file-name? file))
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(cons* "-rpath" (dirname file) args))
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((or %allow-impurities?
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(pure-file-name? file))
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args)
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(else
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(begin
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(format (current-error-port)
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"ld-wrapper: error: attempt to use \
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impure library ~s~%"
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file)
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(exit 1)))))
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'()
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library-files))
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(define (ld-wrapper . args)
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;; Invoke the real `ld' with ARGS, augmented with `-rpath' switches.
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(let* ((path (library-search-path args))
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(libs (library-files-linked args path))
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(args (append args (rpath-arguments libs))))
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(when %debug?
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(format (current-error-port)
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"ld-wrapper: library search path: ~s~%" path)
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(format (current-error-port)
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"ld-wrapper: libraries linked: ~s~%" libs)
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(format (current-error-port)
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"ld-wrapper: invoking `~a' with ~s~%"
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%real-ld args))
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(apply execl %real-ld (basename %real-ld) args)))
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;;; ld-wrapper.scm ends here
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