f5c82e15e0
* nix/scripts/list-runtime-roots.in: New file. * config-daemon.ac: Add `AC_CONFIG_FILES' invocation for it. * daemon.am (nodist_pkglibexec_SCRIPTS): New variable. (AM_TESTS_ENVIRONMENT): Define `top_builddir'. * tests/guix-daemon.sh: Export `NIX_ROOT_FINDER'. * nix/sync-with-upstream: Substitute the path to the root finder in libstore/gc.cc.
116 lines
4.1 KiB
Text
116 lines
4.1 KiB
Text
#!@GUILE@ -ds
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!#
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;;; Guix --- Nix package management from Guile. -*- coding: utf-8 -*-
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;;; Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of Guix.
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;;;
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;;; 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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;;; 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 Guix. If not, see <http://www.gnu.org/licenses/>.
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;;;
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;;; List files being used at run time; these files are garbage collector
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;;; roots. This is equivalent to `find-runtime-roots.pl' in Nix.
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;;;
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(use-modules (ice-9 ftw)
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(ice-9 regex)
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(ice-9 rdelim)
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(ice-9 popen)
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(srfi srfi-1)
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(srfi srfi-26))
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(define %proc-directory
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;; Mount point of Linuxish /proc file system.
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"/proc")
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(define (proc-file-roots dir file)
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"Return a one-element list containing the file pointed to by DIR/FILE,
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or the empty list."
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(or (and=> (false-if-exception (readlink (string-append dir "/" file)))
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list)
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'()))
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(define proc-exe-roots (cut proc-file-roots <> "exe"))
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(define proc-cwd-roots (cut proc-file-roots <> "cwd"))
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(define (proc-fd-roots dir)
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"Return the list of store files referenced by DIR, which is a
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/proc/XYZ directory."
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(let ((dir (string-append dir "/fd")))
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(filter-map (lambda (file)
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(let ((target (false-if-exception
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(readlink (string-append dir "/" file)))))
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(and target
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(string-prefix? "/" target)
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target)))
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(scandir dir string->number))))
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(define (proc-maps-roots dir)
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"Return the list of store files referenced by DIR, which is a
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/proc/XYZ directory."
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(define %file-mapping-line
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(make-regexp "^.*[[:blank:]]+/([^ ]+)$"))
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(call-with-input-file (string-append dir "/maps")
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(lambda (maps)
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(let loop ((line (read-line maps))
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(roots '()))
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(cond ((eof-object? line)
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roots)
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((regexp-exec %file-mapping-line line)
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=>
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(lambda (match)
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(let ((file (string-append "/"
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(match:substring match 1))))
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(loop (read-line maps)
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(cons file roots)))))
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(else
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(loop (read-line maps) roots)))))))
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(define (lsof-roots)
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"Return the list of roots as found by calling `lsof'."
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(catch 'system
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(lambda ()
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(let ((pipe (open-pipe* OPEN_READ "lsof" "-n" "-w" "-F" "n")))
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(define %file-rx
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(make-regexp "^n/(.*)$"))
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(let loop ((line (read-line pipe))
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(roots '()))
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(cond ((eof-object? line)
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(begin
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(close-pipe pipe)
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roots))
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((regexp-exec %file-rx line)
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=>
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(lambda (match)
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(loop (read-line pipe)
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(cons (string-append "/"
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(match:substring match 1))
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roots))))
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(else
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(loop (read-line pipe) roots))))))
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(lambda _
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'())))
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(let ((proc (format #f "~a/~a" %proc-directory (getpid))))
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(for-each (cut simple-format #t "~a~%" <>)
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(delete-duplicates
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(let ((proc-roots (if (file-exists? proc)
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(append (proc-exe-roots proc)
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(proc-cwd-roots proc)
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(proc-fd-roots proc)
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(proc-maps-roots proc))
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'())))
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(append proc-roots (lsof-roots))))))
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