GNU logs - #45676, boring messages

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Subject: bug#45676: Store references inside compressed data
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There are several binary formats that allow compression of the
executable image, or some of its data, which is decompress at runtime:

  - Kernel images.
  - Compressed libraries: e.g. Smalltalk modules.
  - Compressed executable or data files: e.g. library.el.gz.

These aren't taken into account by the grafting process, which may lead
to issues when store paths are located inside that kind of files.

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To: Miguel =?UTF-8?Q?=C3=81ngel?= Arruga Vivas <rosen644835@HIDDEN>
Subject: bug#45676: Acknowledgement (Store references inside compressed data)
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Subject: bug#45676: Store references inside compressed data
Resent-From: Leo Famulari <leo@HIDDEN>
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Date: Tue, 5 Jan 2021 15:22:10 -0500
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On Tue, Jan 05, 2021 at 03:36:07PM +0100, Miguel �ngel Arruga Vivas wrote:
> There are several binary formats that allow compression of the
> executable image, or some of its data, which is decompress at runtime:
> 
>   - Kernel images.
>   - Compressed libraries: e.g. Smalltalk modules.
>   - Compressed executable or data files: e.g. library.el.gz.
> 
> These aren't taken into account by the grafting process, which may lead
> to issues when store paths are located inside that kind of files.

It's a serious problem, and not just because of grafting. These obscured
references can cause things to be garbage collected inappropriately.

Here is an older case of the same problem:

https://bugs.gnu.org/24703

It was resolved by patching GCC.

Message sent to bug-guix@HIDDEN:

Subject: bug#45676: Store references inside compressed data
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Date: Tue, 5 Jan 2021 15:22:33 -0500
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On Tue, Jan 05, 2021 at 03:36:07PM +0100, Miguel �ngel Arruga Vivas wrote:
> There are several binary formats that allow compression of the
> executable image, or some of its data, which is decompress at runtime:
> 
>   - Kernel images.
>   - Compressed libraries: e.g. Smalltalk modules.
>   - Compressed executable or data files: e.g. library.el.gz.
> 
> These aren't taken into account by the grafting process, which may lead
> to issues when store paths are located inside that kind of files.

If you have specific instances of this type of bug, please report them.

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--=-=-=
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Hi!

Miguel =C3=81ngel Arruga Vivas wrote:
> These aren't taken into account by the grafting process, which=20
> may lead
> to issues when store paths are located inside that kind of=20
> files.

It's true.  It's a known trade-off of an otherwise=20
almost-zero-effort yet fast reference scanner.  I don't think it's=20
a bug per se, but it is something of which to be aware.  I also=20
think this trade-off is worth it.

Luckily, this case is easier to fix than the infamous=20
<http://issues.guix.gnu.org/24703>, because the right solution is=20
simple:

>   - Compressed libraries: e.g. Smalltalk modules.
>   - Compressed executable or data files: e.g. library.el.gz.

Let's stop installing compressed executables & data files.  We=20
already avoid compressed .jars and other renamed zip files.  It=20
ain't right.

It's not 1998, my hard drive isn't 1.1GB, and I didn't just=20
reinstall Slackware because I =E2=80=98accidentally=E2=80=99 gzexe'd gzip.

Gzipping a tiny handful of Lisp or Smalltalk files is pointless=20
when zstd {,de}compresses my entire 500GB SSD better and faster,=20
at the file system level where it now squarely belongs.  Without=20
breaking Guix.

Kind regards,

T G-R

--=-=-=
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--=-=-=
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Hi!

Miguel =C3=81ngel Arruga Vivas wrote:
> These aren't taken into account by the grafting process, which=20
> may lead
> to issues when store paths are located inside that kind of=20
> files.

It's true.  It's a known trade-off of an otherwise=20
almost-zero-effort yet fast reference scanner.  I don't think it's=20
a bug per se, but it is something of which to be aware.  I also=20
think this trade-off is worth it.

Luckily, this case is easier to fix than the infamous=20
<http://issues.guix.gnu.org/24703>, because the right solution is=20
simple:

>   - Compressed libraries: e.g. Smalltalk modules.
>   - Compressed executable or data files: e.g. library.el.gz.

Let's stop installing compressed executables & data files.  We=20
already avoid compressed .jars and other renamed zip files.  It=20
ain't right.

It's not 1998, my hard drive isn't 1.1GB, and I didn't just=20
reinstall Slackware because I =E2=80=98accidentally=E2=80=99 gzexe'd gzip.

Gzipping a tiny handful of Lisp or Smalltalk files is pointless=20
when zstd {,de}compresses my entire 500GB SSD better and faster,=20
at the file system level where it now squarely belongs.  Without=20
breaking Guix.

Kind regards,

T G-R

--=-=-=
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--=-=-=--

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Content-Type: text/plain; charset="UTF-8"
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Hi!
Am Dienstag, den 05.01.2021, 23:33 +0100 schrieb Tobias Geerinckx-Rice:
> Let's stop installing compressed executables & data files.  We 
> already avoid compressed .jars and other renamed zip files.  It 
> ain't right.
Would this be strictly necessary even if the same references are kept
through other files, e.g. uncompressed binaries?
I'll attach a patch, that fixes Emacs just in case.

Regards, Leo

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Hi,

Leo Famulari <leo@HIDDEN> skribis:

> On Tue, Jan 05, 2021 at 03:36:07PM +0100, Miguel =C3=81ngel Arruga Vivas =
wrote:
>> There are several binary formats that allow compression of the
>> executable image, or some of its data, which is decompress at runtime:
>>=20
>>   - Kernel images.
>>   - Compressed libraries: e.g. Smalltalk modules.
>>   - Compressed executable or data files: e.g. library.el.gz.
>>=20
>> These aren't taken into account by the grafting process, which may lead
>> to issues when store paths are located inside that kind of files.
>
> If you have specific instances of this type of bug, please report them.

Agreed.  The general issue is =E2=80=9Cwell known=E2=80=9D as we say, but w=
hat I think
we need to do is look for specific instances and address them.

Ludo=E2=80=99.

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