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Fri, 6 Jun 2025 06:19:20 +0000 From: "'Heinisch, Alexander' via isar-users" To: "isar-users@googlegroups.com" , "MOESSBAUER, Felix" CC: "Kiszka, Jan" Subject: Re: [PATCH 1/1] wic: disable generation of python bytecode cache Thread-Topic: [PATCH 1/1] wic: disable generation of python bytecode cache Thread-Index: AQHb1ipgqKYhMPVSZ0OlBFnORlllwLP1qYkA Date: Fri, 6 Jun 2025 06:19:20 +0000 Message-ID: <6089b70079752de7da49c81a94c43600912dd801.camel@siemens.com> References: <20250605145837.1384007-1-felix.moessbauer@siemens.com> In-Reply-To: <20250605145837.1384007-1-felix.moessbauer@siemens.com> Accept-Language: de-AT, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Evolution 3.52.3-0ubuntu1 x-ms-publictraffictype: Email x-ms-traffictypediagnostic: AM7PR10MB3320:EE_|PRAPR10MB5400:EE_ x-ms-office365-filtering-correlation-id: 63fd36a7-d680-42d6-bbfd-08dda4c212fd x-ms-exchange-atpmessageproperties: SA x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0;ARA:13230040|366016|376014|1800799024|38070700018; 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charset="UTF-8" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: siemens.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: AM7PR10MB3320.EURPRD10.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-Network-Message-Id: 63fd36a7-d680-42d6-bbfd-08dda4c212fd X-MS-Exchange-CrossTenant-originalarrivaltime: 06 Jun 2025 06:19:20.5191 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 38ae3bcd-9579-4fd4-adda-b42e1495d55a X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 84ToBolGVIhG4bmGbhJOed8MI07ZljGNMU4CRwYiW9RMAO2Ld6ktcl4MmmkpEjk1OJ52Z4l9O5fm984G0Mi4M1v+mzoVzIHVp43qAT9BIzs= X-MS-Exchange-Transport-CrossTenantHeadersStamped: PRAPR10MB5400 X-Original-Sender: alexander.heinisch@siemens.com X-Original-Authentication-Results: gmr-mx.google.com; dkim=pass header.i=@siemens.com header.s=selector2 header.b=xfM2UU9S; arc=pass (i=1 spf=pass spfdomain=siemens.com dkim=pass dkdomain=siemens.com dmarc=pass fromdomain=siemens.com); spf=pass (google.com: domain of alexander.heinisch@siemens.com designates 2a01:111:f403:c200::1 as permitted sender) smtp.mailfrom=alexander.heinisch@siemens.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=siemens.com X-Original-From: "Heinisch, Alexander" Reply-To: "Heinisch, Alexander" Precedence: list Mailing-list: list isar-users@googlegroups.com; contact isar-users+owners@googlegroups.com List-ID: X-Spam-Checked-In-Group: isar-users@googlegroups.com X-Google-Group-Id: 914930254986 List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , X-Spam-Status: No, score=-4.9 required=5.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,MAILING_LIST_MULTI, RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H2,RCVD_IN_RP_CERTIFIED, RCVD_IN_RP_RNBL,RCVD_IN_RP_SAFE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on shymkent.ilbers.de X-TUID: p+MjXOz6zIzQ On Thu, 2025-06-05 at 16:58 +0200, 'Felix Moessbauer' via isar-users wrote: > Wic is executed as root, so the python bytecode cache is also > created as root. This is problematic as the cache is created inside > the > source tree in a folder__pycache__ next to the python script itself. > By > that, we end up with files belonging to root inside the repo source > tree, which makes it impossible to delete the source tree as a > regular > user. >=20 > This problem became visible with the kas purge plugin that removes > the > fetched layers as a regular user (these layers are fetched and > managed > by kas). Also the read-only mounting of repos in kas does not help > here, > as the fetched repos are not mounted ro for obvious reasons. >=20 > Anyways, we should not create files inside the source tree that do > not > belong to the calling user. To fix this, we just disable the python > cache for the wic task. This is the only task that executes a python > script from the source tree as root. Hi Felix, What about moving the cache to the build dir? I just did a quick test using `PYTHONPYCACHEPREFIX` (see [1]) which was added in Python 3.8 (so works for hosts >=3D bullseye) ``` diff --git a/meta/classes/imagetypes_wic.bbclass b/meta/classes/imagetypes_wic.bbclass index 38b5f0e1..7b8dc38c 100644 --- a/meta/classes/imagetypes_wic.bbclass +++ b/meta/classes/imagetypes_wic.bbclass @@ -157,6 +157,7 @@ generate_wic_image() { export FAKEROOTCMD=3D${FAKEROOTCMD} export BUILDDIR=3D${TOPDIR} export MTOOLS_SKIP_CHECK=3D1 + export PYTHONPYCACHEPREFIX=3D"${TOPDIR}/__pycache__" mkdir -p ${IMAGE_ROOTFS}/../pseudo touch ${IMAGE_ROOTFS}/../pseudo/files.db``` and it seems to do the job. In depth testing still required! [1]: https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPYCACHEPREFIX BR Alexander >=20 > Signed-off-by: Felix Moessbauer > --- > =C2=A0meta/classes/imagetypes_wic.bbclass | 1 + > =C2=A01 file changed, 1 insertion(+) >=20 > diff --git a/meta/classes/imagetypes_wic.bbclass > b/meta/classes/imagetypes_wic.bbclass > index 7a050e73..fb0b81a9 100644 > --- a/meta/classes/imagetypes_wic.bbclass > +++ b/meta/classes/imagetypes_wic.bbclass > @@ -157,6 +157,7 @@ generate_wic_image() { > =C2=A0=C2=A0=C2=A0=C2=A0 export FAKEROOTCMD=3D${FAKEROOTCMD} > =C2=A0=C2=A0=C2=A0=C2=A0 export BUILDDIR=3D${TOPDIR} > =C2=A0=C2=A0=C2=A0=C2=A0 export MTOOLS_SKIP_CHECK=3D1 > +=C2=A0=C2=A0=C2=A0 export PYTHONDONTWRITEBYTECODE=3D1 > =C2=A0=C2=A0=C2=A0=C2=A0 mkdir -p ${IMAGE_ROOTFS}/../pseudo > =C2=A0=C2=A0=C2=A0=C2=A0 touch ${IMAGE_ROOTFS}/../pseudo/files.db > =C2=A0 > --=20 > 2.49.0 >=20 --=20 You received this message because you are subscribed to the Google Groups "= isar-users" group. 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