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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.
This commit is contained in:
Ludovic Courtès 2012-12-05 16:29:28 +01:00
parent 8b15ac6700
commit f5c82e15e0
6 changed files with 131 additions and 1 deletions
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1
.gitignore vendored
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@ -61,3 +61,4 @@ stamp-h[0-9]
/libutil.a
/guix-daemon
/test-tmp
/nix/scripts/list-runtime-roots

3
config-daemon.ac
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@ -91,6 +91,9 @@ if test "x$guix_build_daemon" = "xyes"; then
dnl Check for <linux/fs.h> (for immutable file support).
AC_CHECK_HEADERS([linux/fs.h])
AC_CONFIG_FILES([nix/scripts/list-runtime-roots],
[chmod +x nix/scripts/list-runtime-roots])
fi
AM_CONDITIONAL([BUILD_DAEMON], [test "x$guix_build_daemon" = "xyes"])

4
daemon.am
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@ -146,6 +146,9 @@ nix/libstore/schema.sql.hh: nix/libstore/schema.sql
(lambda (in) \
(write (get-string-all in) out)))))"
nodist_pkglibexec_SCRIPTS = \
nix/scripts/list-runtime-roots
EXTRA_DIST += \
nix/sync-with-upstream \
nix/libstore/schema.sql \
@ -156,6 +159,7 @@ EXTRA_DIST += \
test_root = $(abs_top_builddir)/test-tmp
AM_TESTS_ENVIRONMENT += \
top_builddir="$(abs_top_builddir)" \
TEST_ROOT="$(test_root)"
TESTS += \

116
nix/scripts/list-runtime-roots.in Normal file
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@ -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))))))

4
nix/sync-with-upstream
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@ -62,3 +62,7 @@ do
done
cp -v "$top_srcdir/nix-upstream/"{COPYING,AUTHORS} "$top_srcdir/nix"
# Substitutions.
sed -i "$top_srcdir/nix/libstore/gc.cc" \
-e 's|/nix/find-runtime-roots\.pl|/guix/list-runtime-roots|g'

4
tests/guix-daemon.sh
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@ -29,8 +29,10 @@ NIX_LOCALSTATE_DIR="$TEST_ROOT/var"
NIX_LOG_DIR="$TEST_ROOT/var/log/nix"
NIX_STATE_DIR="$TEST_ROOT/var/nix"
NIX_DB_DIR="$TEST_ROOT/db"
NIX_ROOT_FINDER="$top_builddir/nix/scripts/list-runtime-roots"
export NIX_SUBSTITUTERS NIX_IGNORE_SYMLINK_STORE NIX_STORE_DIR \
NIX_LOCALSTATE_DIR NIX_LOG_DIR NIX_STATE_DIR NIX_DB_DIR
NIX_LOCALSTATE_DIR NIX_LOG_DIR NIX_STATE_DIR NIX_DB_DIR \
NIX_ROOT_FINDER
guix-daemon --version
guix-build --version