GNU bug report logs - #34030
Offloading sets mtime relative to current timezone

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Package: guix; Reported by: Ludovic Courtès <ludo@HIDDEN>; Keywords: notabug; Done: Ludovic Courtès <ludo@HIDDEN>; Maintainer for guix is bug-guix@HIDDEN.
bug closed, send any further explanations to 34030 <at> debbugs.gnu.org and Ludovic Courtès <ludo@HIDDEN> Request was from Ludovic Courtès <ludo@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Added tag(s) notabug. Request was from Ludovic Courtès <ludo@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: 34030 <at> debbugs.gnu.org
Subject: Re: bug#34030: Offloading sets mtime relative to current timezone
References: <878szsd2f4.fsf@HIDDEN>
Date: Thu, 10 Jan 2019 16:59:09 +0100
In-Reply-To: <878szsd2f4.fsf@HIDDEN> ("Ludovic
 \=\?utf-8\?Q\?Court\=C3\=A8s\=22'\?\=
 \=\?utf-8\?Q\?s\?\= message of "Thu, 10 Jan 2019 15:15:27 +0100")
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Ludovic Court=C3=A8s <ludo@HIDDEN> skribis:

> The =E2=80=98reset-timestamps=E2=80=99 procedure in (guix store database)=
 apparently
> sets the time relative to the current timezone, leading to
> discrepancies:

It may not be the right diagnostic.  We have this:

--8<---------------cut here---------------start------------->8---
ludo@berlin ~$ stat -c '%Y %h %n' /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw=
7h-guix-0.16.0-8.7ba2b27/lib/guile/2.2/site-ccache/guix/*.go | sort -k1 -n
-3599 112 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27=
/lib/guile/2.2/site-ccache/guix/sets.go
-3599 306 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27=
/lib/guile/2.2/site-ccache/guix/licenses.go
-3599 32 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/=
lib/guile/2.2/site-ccache/guix/svn-download.go
-3599 36 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/=
lib/guile/2.2/site-ccache/guix/hg-download.go
-3599 39 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/=
lib/guile/2.2/site-ccache/guix/graph.go
-3599 403 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27=
/lib/guile/2.2/site-ccache/guix/serialization.go
-3599 414 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27=
/lib/guile/2.2/site-ccache/guix/http-client.go
-3599 435 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27=
/lib/guile/2.2/site-ccache/guix/ftp-client.go
-3599 437 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27=
/lib/guile/2.2/site-ccache/guix/combinators.go
-3599 43 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/=
lib/guile/2.2/site-ccache/guix/upstream.go
-3599 441 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27=
/lib/guile/2.2/site-ccache/guix/monad-repl.go
-3599 445 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27=
/lib/guile/2.2/site-ccache/guix/cve.go
-3599 445 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27=
/lib/guile/2.2/site-ccache/guix/describe.go
-3599 445 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27=
/lib/guile/2.2/site-ccache/guix/gnupg.go
-3599 453 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27=
/lib/guile/2.2/site-ccache/guix/discovery.go
-3599 457 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27=
/lib/guile/2.2/site-ccache/guix/pki.go
-3599 461 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27=
/lib/guile/2.2/site-ccache/guix/workers.go
-3599 462 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27=
/lib/guile/2.2/site-ccache/guix/base32.go
-3599 462 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27=
/lib/guile/2.2/site-ccache/guix/base64.go
-3599 462 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27=
/lib/guile/2.2/site-ccache/guix/i18n.go
-3599 466 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27=
/lib/guile/2.2/site-ccache/guix/cache.go
-3599 480 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27=
/lib/guile/2.2/site-ccache/guix/profiling.go
-3599 485 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27=
/lib/guile/2.2/site-ccache/guix/glob.go
-3599 50 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/=
lib/guile/2.2/site-ccache/guix/modules.go
-3599 518 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27=
/lib/guile/2.2/site-ccache/guix/base16.go
-3599 554 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27=
/lib/guile/2.2/site-ccache/guix/records.go
0 52 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/=
guile/2.2/site-ccache/guix/memoization.go
0 8 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/cvs-download.go
1 105 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib=
/guile/2.2/site-ccache/guix/ssh.go
1 117 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib=
/guile/2.2/site-ccache/guix/inferior.go
1 156 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib=
/guile/2.2/site-ccache/guix/download.go
1 235 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib=
/guile/2.2/site-ccache/guix/grafts.go
1 274 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib=
/guile/2.2/site-ccache/guix/docker.go
1 2 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/build-system.go
1 2 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/ci.go
1 2 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/cpio.go
1 2 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/derivations.go
1 2 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/elf.go
1 2 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/gexp.go
1 2 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/gnu-maintenance.go
1 2 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/monads.go
1 2 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/packages.go
1 2 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/profiles.go
1 2 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/progress.go
1 2 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/search-paths.go
1 2 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/self.go
1 2 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/store.go
1 2 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/swh.go
1 2 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/zlib.go
1 363 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib=
/guile/2.2/site-ccache/guix/nar.go
1 363 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib=
/guile/2.2/site-ccache/guix/tests.go
1 3 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/git-download.go
1 419 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib=
/guile/2.2/site-ccache/guix/scripts.go
1 4 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/status.go
1 5 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/channels.go
1 5 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/git.go
1 6 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/g=
uile/2.2/site-ccache/guix/config.go
1 82 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/=
guile/2.2/site-ccache/guix/utils.go
1 88 /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/lib/=
guile/2.2/site-ccache/guix/ui.go
--8<---------------cut here---------------end--------------->8---

(First column is mtime, second column is nlinks.)

Many files are OK.  Those with mtime=3D0 date back to before commit
e4752118691e41ae8307649d1abfd4739b3e4bfa.

Those with mtime=3D-3599 typically have a lot of hard links (for
deduplication) and correspond to source files that rarely change, which
suggests they might have been created long ago and we=E2=80=99re just seein=
g now
the symptoms of old problems.

Actually, the wrong mtime may come from the synchronization of the store
on the new storage device on berlin a couple of months ago.  That sounds
very likely.

I was not able to reproduce on my machine using =E2=80=98guix copy --from=
=E2=80=99
(which uses the same code path as offloading) so I=E2=80=99ll just close it
assuming it=E2=80=99s a problem specific to berlin.

Ludo=E2=80=99.




Information forwarded to bug-guix@HIDDEN:
bug#34030; Package guix. Full text available.

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Bug Guix <bug-guix@HIDDEN>
Subject: Offloading sets mtime relative to current timezone
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The =E2=80=98reset-timestamps=E2=80=99 procedure in (guix store database) a=
pparently
sets the time relative to the current timezone, leading to
discrepancies:

--8<---------------cut here---------------start------------->8---
$ TZ=3DUTC stat /gnu/store/9fn3k60lgg28r40p2b74nzhy5v3a9cp8-guix-dbd346a/./=
guix/ftp-client.scm /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0=
-8.7ba2b27/lib/guile/2.2/site-ccache/guix/ftp-client.go
  File: /gnu/store/9fn3k60lgg28r40p2b74nzhy5v3a9cp8-guix-dbd346a/./guix/ftp=
-client.scm
  Size: 12062           Blocks: 24         IO Block: 4096   regular file
Device: 811h/2065d      Inode: 169314017   Links: 73
Access: (0444/-r--r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2019-01-10 10:14:11.376891486 +0000
Modify: 1970-01-01 00:00:01.000000000 +0000
Change: 2019-01-10 13:57:56.753652848 +0000
 Birth: -
  File: /gnu/store/c1ndi2hbg1fcs06gwmbwp297ky2pkw7h-guix-0.16.0-8.7ba2b27/l=
ib/guile/2.2/site-ccache/guix/ftp-client.go
  Size: 110469          Blocks: 216        IO Block: 4096   regular file
Device: 811h/2065d      Inode: 349340114   Links: 435
Access: (0444/-r--r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2019-01-09 17:57:27.717568033 +0000
Modify: 1969-12-31 23:00:01.000000000 +0000
Change: 2019-01-08 17:57:01.368666736 +0000
--8<---------------cut here---------------end--------------->8---

The time should always be one-second-after-Epoch, UTC.

Ludo=E2=80=99.




Acknowledgement sent to Ludovic Courtès <ludo@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-guix@HIDDEN. Full text available.
Report forwarded to bug-guix@HIDDEN:
bug#34030; Package guix. Full text available.
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