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Subject: |
28.0.50; Byte compilation fails if destination file is a mount point |
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Date: |
Sat, 14 Nov 2020 13:39:56 +0100 |
$ mkdir /tmp/mount
$ touch /tmp/mount/{file.el,file.elc,out.elc}
$ sudo mount --bind /tmp/mount/{out,file}.elc
$ emacs -Q -batch -f batch-byte-compile /tmp/mount/file.el
>>Error occurred processing /tmp/mount/file.el: File error (("Renaming" "Device
>>or resource busy" "/tmp/mount/file.elc91nN38" "/tmp/mount/file.elc"))
Removing old name: Device or resource busy, /tmp/mount/file.elc
Granted, this is rather exotic. Nevertheless, byte-compile-file could
fall back to a direct write-region without temporary file + rename, or
rename-file could fall back to copy + remove on EBUSY (like EXDEV).
In GNU Emacs 28.0.50 (build 123, x86_64-pc-linux-gnu, GTK+ Version 3.24.22,
cairo version 1.16.0)
of 2020-11-14
Repository revision: b13e87c35bb0215c211a456b8bc3184bf16eb5de
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Debian GNU/Linux rodete
Configured using:
'configure --enable-gcc-warnings=warn-only
--enable-gtk-deprecation-warnings --without-pop --with-mailutils
--enable-checking=all --enable-check-lisp-object-type --with-modules
'CFLAGS=-O0 -ggdb3''
Configured features:
XPM JPEG TIFF GIF PNG CAIRO SOUND DBUS GSETTINGS GLIB NOTIFY INOTIFY
LIBSELINUX GNUTLS FREETYPE HARFBUZZ ZLIB TOOLKIT_SCROLL_BARS GTK3 X11
XDBE XIM MODULES THREADS LIBSYSTEMD JSON PDUMPER
Important settings:
value of $LANG: en_US.utf8
value of $XMODIFIERS: @im=ibus
locale-coding-system: utf-8-unix
Major mode: Lisp Interaction
Minor modes in effect:
tooltip-mode: t
global-eldoc-mode: t
eldoc-mode: t
electric-indent-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: t
Load-path shadows:
None found.
Features:
(shadow sort mail-extr emacsbug message rmc dired dired-loaddefs rfc822
mml easymenu mml-sec epa epg epg-config gnus-util rmail rmail-loaddefs
time-date mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev
gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util
mail-prsvr mail-utils phst skeleton derived edmacro kmacro pcase ffap
thingatpt url url-proxy url-privacy url-expand url-methods url-history
url-cookie url-domsuf url-util url-parse auth-source cl-seq eieio
eieio-core cl-macs eieio-loaddefs password-cache json map url-vars
mailcap rx gnutls puny dbus xml subr-x seq byte-opt gv bytecomp
byte-compile cconv compile text-property-search comint ansi-color ring
cl-loaddefs cl-lib tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/x-win x-win term/common-win x-dnd tool-bar
dnd fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode elisp-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core term/tty-colors frame minibuffer cl-generic
cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray
cl-preloaded nadvice button loaddefs faces cus-face macroexp files
window text-properties overlay sha1 md5 base64 format env code-pages
mule custom widget hashtable-print-readable backquote threads dbusbind
inotify dynamic-setting system-font-setting font-render-setting cairo
move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)
Memory information:
((conses 16 69605 6950)
(symbols 48 8580 1)
(strings 32 24388 1373)
(string-bytes 1 790285)
(vectors 16 13889)
(vector-slots 8 188851 5441)
(floats 8 26 30)
(intervals 56 212 0)
(buffers 992 11))
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--- End Message ---
--- Begin Message ---
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Subject: |
Re: bug#44631: 28.0.50; Byte compilation fails if destination file is a mount point |
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Date: |
Sun, 13 Dec 2020 17:41:55 +0100 |
Am So., 13. Dez. 2020 um 13:32 Uhr schrieb Lars Ingebrigtsen <larsi@gnus.org>:
>
> Philipp Stephani <p.stephani2@gmail.com> writes:
>
> > I guess it also depends on what the semantics are that
> > byte-compile-file guarantees. If it attempts to guarantee atomicity,
> > then only a intra-filesystem rename (or similar alternatives such as
> > O_TMPFILE + linkat) are acceptable, and technically, not even the
> > current fallback on EXDEV (which makes rename-file nonatomic) is OK.
> > If atomic writes are best-effort, then we could always fall back to
> > copy-file + delete-file on any file-error.
>
> It's definitely best-effort, so altering byte-compile-file to try
> copy-file + delete-file sounds like the best solution to me.
I've now pushed a slightly different fix to master (commit
fe50a8b9ba79b4ac14a3a352d8bf84eaee4f2122).
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