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dkim=pass header.i=@siemens.com header.s=selector2 header.b=d2oqe9Yt; 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 jan.kiszka@siemens.com designates 2a01:111:f403:c201::1 as permitted sender) smtp.mailfrom=jan.kiszka@siemens.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=siemens.com X-Original-From: Jan Kiszka Reply-To: Jan Kiszka 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: o8ZtryPffqpa On 06.06.25 08:19, Heinisch, Alexander (FT RPD CED SES-AT) wrote: > 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. >> >> 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. >> >> 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 >= 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=${FAKEROOTCMD} > export BUILDDIR=${TOPDIR} > export MTOOLS_SKIP_CHECK=1 > + export PYTHONPYCACHEPREFIX="${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 > What's yocto doing about this BTW? Are we just missing some of their bits, or are they affected by a similar issue (except for creating the cache as root)? Jan -- Siemens AG, Foundational Technologies Linux Expert Center -- You received this message because you are subscribed to the Google Groups "isar-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to isar-users+unsubscribe@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/isar-users/319f0cbe-dc36-49eb-82b1-d3a0ed468707%40siemens.com.