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Subject: bug#56076: guix shell -P behavior is surprising with persistent home
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I am using guix shell to create an isolated container, but using a
persistent home directory to preserve configuration and state for the
program in the container.  Specifically, I am using (lightly
simplified; note that the user is elb and the manifest contains ONLY
syncthing):

CONTAINER_HOME=/path/to/persistent/home
MANIFEST=/path/to/manifest.scm

guix shell --container --network --no-cwd -P      \
           --share=$CONTAINER_HOME=/home/elb --   \
           /bin/sh -c 'SSL_CERT_DIR="$HOME/.guix-profile/etc/ssl/certs" syncthing'

Because syncthing requires a certificate store, the easiest way to
configure that seemed to be through the profile /etc dir, which meant
using -P.  The above command works, and works correctly, but only the
first time the profile is started.

On subsequent starts, guix complains that:

guix shell: error: cannot link profile: '/home/elb/.guix-profile' already exists within container

This is easily worked around by removing .guix-profile from the
--share-bound home directory before invoking guix shell.

It is not clear to me that this is a bug, but it was surprising.  It
was also surprising that there was not an obvious way to simply
declare a persistent home directory for a container, although now that
I understand the `guix shell` command better, I find this less
surprising than I did when I was first exploring.

Ethan

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To: Ethan Blanton <elb@HIDDEN>
Subject: bug#56076: Acknowledgement (guix shell -P behavior is surprising
 with persistent home)
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Subject: bug#56076: guix shell -P behavior is surprising with persistent home
Resent-From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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Date: Fri, 24 Jun 2022 23:10:21 +0200
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Hi Ethan,

Ethan Blanton <elb@HIDDEN> skribis:

> I am using guix shell to create an isolated container, but using a
> persistent home directory to preserve configuration and state for the
> program in the container.  Specifically, I am using (lightly
> simplified; note that the user is elb and the manifest contains ONLY
> syncthing):
>
> CONTAINER_HOME=3D/path/to/persistent/home
> MANIFEST=3D/path/to/manifest.scm
>
> guix shell --container --network --no-cwd -P      \
>            --share=3D$CONTAINER_HOME=3D/home/elb --   \
>            /bin/sh -c 'SSL_CERT_DIR=3D"$HOME/.guix-profile/etc/ssl/certs"=
 syncthing'
>
> Because syncthing requires a certificate store, the easiest way to
> configure that seemed to be through the profile /etc dir, which meant
> using -P.  The above command works, and works correctly, but only the
> first time the profile is started.

I guess it=E2=80=99s confusing because =E2=80=98-P=E2=80=99 and =E2=80=98--=
share=E2=80=99 kind of step on each
other=E2=80=99s toes: they both want to control /home/elb.

> On subsequent starts, guix complains that:
>
> guix shell: error: cannot link profile: '/home/elb/.guix-profile' already=
 exists within container
>
> This is easily worked around by removing .guix-profile from the
> --share-bound home directory before invoking guix shell.
>
> It is not clear to me that this is a bug, but it was surprising.  It
> was also surprising that there was not an obvious way to simply
> declare a persistent home directory for a container, although now that
> I understand the `guix shell` command better, I find this less
> surprising than I did when I was first exploring.

Yeah, I=E2=80=99m not sure how to better handle that; the two options are
conflicting.

That said, for this particular use case, you could do:

  guix shell syncthing nss-certs openssl -- syncthing

Adding =E2=80=98openssl=E2=80=99 to the mix is a trick to ensure that SSL_C=
ERT_DIR is
defined, thanks to the search path mechanism:

  https://guix.gnu.org/manual/devel/en/html_node/Search-Paths.html

Thoughts?

Ludo=E2=80=99.

Message sent to bug-guix@HIDDEN:

Subject: bug#56076: guix shell -P behavior is surprising with persistent home
Resent-From: Maxime Devos <maximedevos@HIDDEN>
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From: Maxime Devos <maximedevos@HIDDEN>
Date: Fri, 24 Jun 2022 23:18:16 +0200
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Ludovic Court=C3=A8s schreef op vr 24-06-2022 om 23:10 [+0200]:
> That said, for this particular use case, you could do:
>=20
> =C2=A0 guix shell syncthing nss-certs openssl -- syncthing
>=20
> Adding =E2=80=98openssl=E2=80=99 to the mix is a trick to ensure that SSL=
_CERT_DIR is
> defined, thanks to the search path mechanism:
>=20
> =C2=A0 https://guix.gnu.org/manual/devel/en/html_node/Search-Paths.html
>=20
> Thoughts?

Having to add openssl looks like a bug, so I'd go for something like
<https://issues.guix.gnu.org/55297> instead, which resolves that.

Greetings,
Maxime.


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Hi,

Maxime Devos <maximedevos@HIDDEN> skribis:

> Ludovic Court=C3=A8s schreef op vr 24-06-2022 om 23:10 [+0200]:
>> That said, for this particular use case, you could do:
>>=20
>> =C2=A0 guix shell syncthing nss-certs openssl -- syncthing
>>=20
>> Adding =E2=80=98openssl=E2=80=99 to the mix is a trick to ensure that SS=
L_CERT_DIR is
>> defined, thanks to the search path mechanism:
>>=20
>> =C2=A0 https://guix.gnu.org/manual/devel/en/html_node/Search-Paths.html
>>=20
>> Thoughts?
>
> Having to add openssl looks like a bug,

It is, but it=E2=80=99s a reasonable solution for the problem at hand.

> so I'd go for something like <https://issues.guix.gnu.org/55297>
> instead, which resolves that.

That=E2=80=99s a bit of a hack to work around this venerable bug:

  https://issues.guix.gnu.org/22138

:-)

Ludo=E2=80=99.

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> > Having to add openssl looks like a bug,
>=20
> It is, but it=E2=80=99s a reasonable solution for the problem at hand.

I don't think it is.  The point of a package manager or distribution is
to automatically install dependencies where required -- in case of
Guix, dependencies can be considered in a more general sense to include
search paths and not only store items.  Having to search #guix or the
ML for work-arounds defeats the point.

My patch <https://issues.guix.gnu.org/55297> could be considered a
work-around, but at least it's automatic for the users, users don't
need to remember random Guix bug facts.

Ludovic Court=C3=A8s schreef op ma 27-06-2022 om 09:55 [+0200]:
> That=E2=80=99s a bit of a hack to work around this venerable bug:
>=20
> =C2=A0 https://issues.guix.gnu.org/22138
>=20
> :-)

Maybe yes, but there's no progress there, so work-arounds are needed,
and I consider my <https://issues.guix.gnu.org/55297> to be less of a
hack than =E2=80=98add random packages=E2=80=99 (at least 55297 is automati=
c for the
user, the user doesn't have to remember random packages).  And even if
we do 55297 now, it's still possible to do 22138 later if deemed
proper.

And the patch there is fragile (e.g., if you have gcc:lib in the
references, you automatically get $LIBRARY_PATH TOO, if you have a
cross-gcc:lib, you'd get a $CROSS_LIBRARY_PATH (untested), it's also
not really lexical (+) -- wrap-program boundaries aren't respected.  It
could also easily go wrong in case of static linking (because then
references disappear).  So I consider 22138 not be be a bug/working
patch but a source of more bugs and 55297 to be a proper fix (*).

(*) Except for $GUIX_LOCPATH, but that could be made magical in the
same sense of $PATH.

(+) E.g., suppose that pkg-config and a cross-pkg-config are somewhere
in the references for whatever reason, but only a single one is in the
(propagated) native-inputs.  They both ahave a $PKG_CONFIG_PATH search
path.  However, they are different search paths (one is native-inputs,
other is inputs), so we would get in trouble when "guix shell -D
package" is extended with a --target option or such to make a cross-
compilation environment.

Greetings,
Maxime.

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