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author | Ludovic Courtès <ludo@gnu.org> | 2012-12-05 16:29:28 +0100 |
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committer | Ludovic Courtès <ludo@gnu.org> | 2012-12-05 16:29:28 +0100 |
commit | f5c82e15e0e76b855bc4cc88ffb79331b7083f39 (patch) | |
tree | be5fa23b0899617c411afca2413655bb1d073ab7 /nix/scripts | |
parent | 8b15ac6700f1345e9efa709dea6e4efcbdaf6d7a (diff) | |
download | gnu-guix-f5c82e15e0e76b855bc4cc88ffb79331b7083f39.tar gnu-guix-f5c82e15e0e76b855bc4cc88ffb79331b7083f39.tar.gz |
daemon: Add `list-runtime-roots' script.
* 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.
Diffstat (limited to 'nix/scripts')
-rw-r--r-- | nix/scripts/list-runtime-roots.in | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/nix/scripts/list-runtime-roots.in b/nix/scripts/list-runtime-roots.in new file mode 100644 index 0000000000..5c21ae543d --- /dev/null +++ b/nix/scripts/list-runtime-roots.in @@ -0,0 +1,116 @@ +#!@GUILE@ -ds +!# +;;; Guix --- Nix package management from Guile. -*- coding: utf-8 -*- +;;; Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org> +;;; +;;; This file is part of Guix. +;;; +;;; 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. +;;; +;;; 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 Guix. If not, see <http://www.gnu.org/licenses/>. + +;;; +;;; List files being used at run time; these files are garbage collector +;;; roots. This is equivalent to `find-runtime-roots.pl' in Nix. +;;; + +(use-modules (ice-9 ftw) + (ice-9 regex) + (ice-9 rdelim) + (ice-9 popen) + (srfi srfi-1) + (srfi srfi-26)) + +(define %proc-directory + ;; Mount point of Linuxish /proc file system. + "/proc") + +(define (proc-file-roots dir file) + "Return a one-element list containing the file pointed to by DIR/FILE, +or the empty list." + (or (and=> (false-if-exception (readlink (string-append dir "/" file))) + list) + '())) + +(define proc-exe-roots (cut proc-file-roots <> "exe")) +(define proc-cwd-roots (cut proc-file-roots <> "cwd")) + +(define (proc-fd-roots dir) + "Return the list of store files referenced by DIR, which is a +/proc/XYZ directory." + (let ((dir (string-append dir "/fd"))) + (filter-map (lambda (file) + (let ((target (false-if-exception + (readlink (string-append dir "/" file))))) + (and target + (string-prefix? "/" target) + target))) + (scandir dir string->number)))) + +(define (proc-maps-roots dir) + "Return the list of store files referenced by DIR, which is a +/proc/XYZ directory." + (define %file-mapping-line + (make-regexp "^.*[[:blank:]]+/([^ ]+)$")) + + (call-with-input-file (string-append dir "/maps") + (lambda (maps) + (let loop ((line (read-line maps)) + (roots '())) + (cond ((eof-object? line) + roots) + ((regexp-exec %file-mapping-line line) + => + (lambda (match) + (let ((file (string-append "/" + (match:substring match 1)))) + (loop (read-line maps) + (cons file roots))))) + (else + (loop (read-line maps) roots))))))) + +(define (lsof-roots) + "Return the list of roots as found by calling `lsof'." + (catch 'system + (lambda () + (let ((pipe (open-pipe* OPEN_READ "lsof" "-n" "-w" "-F" "n"))) + (define %file-rx + (make-regexp "^n/(.*)$")) + + (let loop ((line (read-line pipe)) + (roots '())) + (cond ((eof-object? line) + (begin + (close-pipe pipe) + roots)) + ((regexp-exec %file-rx line) + => + (lambda (match) + (loop (read-line pipe) + (cons (string-append "/" + (match:substring match 1)) + roots)))) + (else + (loop (read-line pipe) roots)))))) + (lambda _ + '()))) + +(let ((proc (format #f "~a/~a" %proc-directory (getpid)))) + (for-each (cut simple-format #t "~a~%" <>) + (delete-duplicates + (let ((proc-roots (if (file-exists? proc) + (append (proc-exe-roots proc) + (proc-cwd-roots proc) + (proc-fd-roots proc) + (proc-maps-roots proc)) + '()))) + (append proc-roots (lsof-roots)))))) |