From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: goeran@uddeborg.se Newsgroups: gmane.emacs.bugs Subject: bug#11245: 24.0.95; set-file-selinux-context fails when the filesystem doesn't support contexts Date: Sun, 15 Apr 2012 13:27:51 +0200 Message-ID: NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Trace: dough.gmane.org 1334489325 16920 80.91.229.3 (15 Apr 2012 11:28:45 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Sun, 15 Apr 2012 11:28:45 +0000 (UTC) To: 11245@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sun Apr 15 13:28:44 2012 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1SJNdI-0006bh-BE for geb-bug-gnu-emacs@m.gmane.org; Sun, 15 Apr 2012 13:28:40 +0200 Original-Received: from localhost ([::1]:59318 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SJNdH-0003xn-Es for geb-bug-gnu-emacs@m.gmane.org; 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X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.13 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) X-Received-From: 140.186.70.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:59086 Archived-At: After upgrading to emacs to the one in Fedora 17 test release, numbered 24.0.95, I started to get messages about emacs failing to write backup files, and it writing a %backup%~ file instead. Checking in the file system, emacs had successfully made a backup file. After a bit of investigation, I believe it has to do with emacs trying to set SELinux context on a file system which doesn't support it. In my case, my home directory is mounted via NFS. So to reproduce, I do the following, starting in a directory in an NFS file system: On the command line: freddi$ touch apa freddi$ ll -Z apa -rw-rw-r--. g=C3=B6ran g=C3=B6ran system_u:object_r:nfs_t:SystemLow apa freddi$ emacs -Q Then, in emacs: M-x s e t - v a r b a c k u b y t C-x C-f a p a a p a C-x C-s Now I get an error message: Cannot write backup file; backing up in ~/.emacs.d/%backup%~ But there is an (empty) file "apa~", so the backup DID succeed. My understanding is that the root cause is the function set-file-selinux-context in fileio.c failing with a file error when the lsetfilecon() call fails. But it is not really an error if it fails with errno set to ENOTSUP. A system which does support SELinux may very well have some parts of the file tree where you can't modify the context. Such as an NFS home directory. It seems to me that the case where lsetfilecon() fails with ENOTSUP should be handled in the same way as if is_selinux_enabled() returned false in the first place, i.e. just return without any error. Do I miss something? In GNU Emacs 24.0.95.1 (x86_64-redhat-linux-gnu, GTK+ Version 2.24.10) of 2012-04-06 on x86-13.phx2.fedoraproject.org Windowing system distributor `Fedora Project', version 11.0.11002000 Configured using: `configure '--build=3Dx86_64-redhat-linux-gnu' '--host=3Dx86_64-redhat-linux-gnu' '--program-prefix=3D' '--disable-dependency-tracking' '--prefix=3D/usr' '--exec-prefix=3D/usr' '--bindir=3D/usr/bin' '--sbindir=3D/usr/sbin' '--sysconfdir=3D/etc' '--datadir=3D/usr/share' '--includedir=3D/usr/include' '--libdir=3D/usr/lib64' '--libexecdir=3D/usr/libexec' '--localstatedir=3D/var' '--sharedstatedir=3D/var/lib' '--mandir=3D/usr/share/man' '--infodir=3D/usr/share/info' '--with-dbus' '--with-gif' '--with-jpeg' '--with-png' '--with-rsvg' '--with-tiff' '--with-xft' '--with-xpm' '--with-x-toolkit=3Dgtk' '--with-gpm=3Dno' '--with-wide-int' 'build_alias=3Dx86_64-redhat-linux-gnu' 'host_alias=3Dx86_64-redhat-linux-gnu' 'CFLAGS=3D-DMAIL_USE_LOCKF -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=3D2 -fexceptions -fstack-protector --param=3Dssp-buffer-size=3D4 -m64 -mtune=3Dgeneric' 'LDFLAGS=3D-Wl,-z,rel= ro '' Important settings: value of $LC_ALL: nil value of $LC_COLLATE: nil value of $LC_CTYPE: nil value of $LC_MESSAGES: nil value of $LC_MONETARY: nil value of $LC_NUMERIC: nil value of $LC_TIME: nil value of $LANG: sv_SE.utf8 value of $XMODIFIERS: nil locale-coding-system: utf-8-unix default enable-multibyte-characters: t Major mode: Fundamental Minor modes in effect: tooltip-mode: t mouse-wheel-mode: t tool-bar-mode: t menu-bar-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t blink-cursor-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t line-number-mode: t transient-mark-mode: (only . t) Recent input: M-x s e t - v a r b a c k u b=20 t C-x C-f a p a a=20 p a C-x C-s M-x r e p o r t - e m a Recent messages: For information about GNU Emacs and the GNU system, type C-h C-a. Saving file /home/g=C3=B6ran/apa... Cannot write backup file; backing up in ~/.emacs.d/%backup%~ Wrote /home/g=C3=B6ran/apa Load-path shadows: None found. Features: (shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail regexp-opt rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils cus-edit easymenu cus-start cus-load wid-edit help-fns time-date tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image fringe lisp-mode register page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean japanese hebrew greek romanian slovak czech european ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer loaddefs button faces cus-face files text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote make-network-process dbusbind dynamic-setting system-font-setting font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)