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Groups > comp.os.linux.misc > #87602

Re: The boring Linux habit that saves machines

From TheLastSysop <thelastsysop@dev.null>
Newsgroups comp.os.linux.misc
Subject Re: The boring Linux habit that saves machines
Date 2026-06-06 10:14 +0000
Organization The Null Device Restoration Society
Message-ID <8af2d73348d22ad1e78d@dev.null> (permalink)
References (4 earlier) <88c5eccca461fb34864c@dev.null> <P-WdndaQg9mveIb3nZ2dnZfqn_udnZ2d@giganews.com> <c666a26d150d22509e46@dev.null> <1100na0$1nk20$3@dont-email.me> <h48dfmxig7.ln2@Telcontar.valinor>

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>On Sat, 6 Jun 2026 12:07:45 +0200, "Carlos E.R." <robin_listas@es.invalid>
>wrote:
>On 2026-06-06 10:55, Lawrence D’Oliveiro wrote:
>> On Sun, 31 May 2026 07:46:12 GMT, TheLastSysop wrote:
>>
>>> Before any mirroring run, I like a preflight that proves the
>>> destination is really mounted and is the expected filesystem, not
>>> just an empty directory that happens to exist.
>>
>> Been there, done that. The simple fix is to make the mount-point
>> directory read-only. That puts a stop to any attempts to put stuff in
>> there without the actual volume being present.
>
>That simple? Does this work? Wow.

It helps, but I would still treat it as a guard rail rather than the whole
check.

If the mirroring job runs as an ordinary user, a read-only mount-point will
usually catch the "disk not mounted, writing into the empty directory" case
nicely.  If the job runs as root, root can still write there unless you add
something else, and some tools may change permissions as part of their work.

For scripts I like both pieces:

    findmnt -rn --target /backup >/dev/null || exit 1

and, if appropriate, check the expected source/device or fstype too.  The read-
only mount-point is a good extra tripwire, but findmnt/mountpoint makes the
failure mode explicit before rsync or cp gets anywhere near the tree.

-- 
TheLastSysop <thelastsysop@dev.null>
"I survived the great rm -rf / rehearsal and all I got was this .signature."

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The boring Linux habit that saves machines TheLastSysop <thelastsysop@dev.null> - 2026-05-30 22:28 +0000
  Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-05-30 23:51 -0400
    Re: The boring Linux habit that saves machines TheLastSysop <thelastsysop@dev.null> - 2026-05-31 04:23 +0000
      Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-05-31 02:26 -0400
        Re: The boring Linux habit that saves machines TheLastSysop <thelastsysop@dev.null> - 2026-05-31 06:41 +0000
          Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-05-31 03:37 -0400
            Re: The boring Linux habit that saves machines TheLastSysop <thelastsysop@dev.null> - 2026-05-31 07:46 +0000
              Re: The boring Linux habit that saves machines Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-06-06 08:55 +0000
                Re: The boring Linux habit that saves machines "Carlos E.R." <robin_listas@es.invalid> - 2026-06-06 12:07 +0200
                Re: The boring Linux habit that saves machines TheLastSysop <thelastsysop@dev.null> - 2026-06-06 10:14 +0000
                Re: The boring Linux habit that saves machines "Carlos E.R." <robin_listas@es.invalid> - 2026-06-06 13:06 +0200
                Re: The boring Linux habit that saves machines TheLastSysop <thelastsysop@dev.null> - 2026-06-06 11:12 +0000
                Re: The boring Linux habit that saves machines Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-06-07 02:45 +0000
                Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-06-07 05:13 -0400
                Re: The boring Linux habit that saves machines Rich <rich@example.invalid> - 2026-06-06 18:30 +0000
                Re: The boring Linux habit that saves machines "Carlos E.R." <robin_listas@es.invalid> - 2026-06-06 20:49 +0200
                Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-06-07 02:00 -0400
          Re: The boring Linux habit that saves machines Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-06-06 09:07 +0000
            Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-06-07 02:11 -0400
          Re: The boring Linux habit that saves machines Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-06-06 09:10 +0000
            Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-06-07 02:15 -0400
      Re: The boring Linux habit that saves machines Anssi Saari <anssi.saari@usenet.mail.kapsi.fi> - 2026-06-01 12:20 +0300
        Re: The boring Linux habit that saves machines TheLastSysop <thelastsysop@dev.null> - 2026-06-01 09:38 +0000
          Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-06-02 02:20 -0400
            Re: The boring Linux habit that saves machines TheLastSysop <thelastsysop@dev.null> - 2026-06-02 11:08 +0000
              Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-06-02 23:58 -0400
                Re: The boring Linux habit that saves machines TheLastSysop <thelastsysop@dev.null> - 2026-06-04 11:47 +0000
                Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-06-04 11:57 -0400
                Re: The boring Linux habit that saves machines TheLastSysop <thelastsysop@dev.null> - 2026-06-05 12:53 +0000
                Re: The boring Linux habit that saves machines Richard Kettlewell <invalid@invalid.invalid> - 2026-06-05 17:35 +0100
                Re: The boring Linux habit that saves machines TheLastSysop <thelastsysop@dev.null> - 2026-06-05 16:42 +0000
                Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-06-06 00:06 -0400
                Re: The boring Linux habit that saves machines Richard Kettlewell <invalid@invalid.invalid> - 2026-06-06 10:35 +0100
                Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-06-07 03:35 -0400
                Re: The boring Linux habit that saves machines The Natural Philosopher <tnp@invalid.invalid> - 2026-06-06 10:39 +0100
                Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-06-07 03:44 -0400
                Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-06-05 23:55 -0400
                Re: The boring Linux habit that saves machines TheLastSysop <thelastsysop@dev.null> - 2026-06-06 09:40 +0000
                Re: The boring Linux habit that saves machines Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-06-07 02:47 +0000
                Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-06-07 04:03 -0400
                Re: The boring Linux habit that saves machines Rich <rich@example.invalid> - 2026-06-06 18:42 +0000
              Re: The boring Linux habit that saves machines Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-06-06 08:53 +0000
                Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-06-07 01:53 -0400
          Re: The boring Linux habit that saves machines Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-06-06 08:52 +0000
            Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-06-07 01:41 -0400
      Re: The boring Linux habit that saves machines Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-06-06 06:41 +0000
        Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-06-06 03:07 -0400
          Re: The boring Linux habit that saves machines "Carlos E.R." <robin_listas@es.invalid> - 2026-06-06 13:28 +0200
          Re: The boring Linux habit that saves machines rbowman <bowman@montana.com> - 2026-06-06 19:16 +0000
            Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-06-07 05:18 -0400
        Re: The boring Linux habit that saves machines TheLastSysop <thelastsysop@dev.null> - 2026-06-06 09:40 +0000
          Re: The boring Linux habit that saves machines Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-06-07 02:51 +0000
          Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-06-07 04:56 -0400
  Re: The boring Linux habit that saves machines "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2026-05-31 16:43 +0800
    Re: The boring Linux habit that saves machines TheLastSysop <thelastsysop@dev.null> - 2026-05-31 08:48 +0000
    Re: The boring Linux habit that saves machines Stéphane CARPENTIER <sc@fiat-linux.fr> - 2026-05-31 10:16 +0000
      Re: The boring Linux habit that saves machines TheLastSysop <thelastsysop@dev.null> - 2026-05-31 10:22 +0000
  Re: The boring Linux habit that saves machines Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-06-06 06:38 +0000
    Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-06-06 03:04 -0400
      Re: The boring Linux habit that saves machines "Carlos E.R." <robin_listas@es.invalid> - 2026-06-06 13:32 +0200
        Re: The boring Linux habit that saves machines TheLastSysop <thelastsysop@dev.null> - 2026-06-06 11:34 +0000
          Re: The boring Linux habit that saves machines "Carlos E.R." <robin_listas@es.invalid> - 2026-06-06 14:01 +0200
    Re: The boring Linux habit that saves machines Nuno Silva <nunojsilva@invalid.invalid> - 2026-06-06 09:17 +0100
      Re: The boring Linux habit that saves machines TheLastSysop <thelastsysop@dev.null> - 2026-06-06 09:40 +0000
        Re: The boring Linux habit that saves machines Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-06-07 02:57 +0000
        Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-06-07 04:18 -0400
      Re: The boring Linux habit that saves machines c186282 <c186282@nnada.net> - 2026-06-07 01:33 -0400

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