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Thu, 25 Sep 2025 09:08:53 +0000 From: "'MOESSBAUER, Felix' via isar-users" To: "isar-users@googlegroups.com" , "cedric.hombourger@siemens.com" Subject: Re: [PATCH v4 0/4] non-privileged commands in chroot Thread-Topic: [PATCH v4 0/4] non-privileged commands in chroot Thread-Index: AQHcLelRyU80M14nQEevLtPQP5kabrSjnDMA Date: Thu, 25 Sep 2025 09:08:53 +0000 Message-ID: <7726069416bb27b02244de47750ffeceb64bd6ca.camel@siemens.com> References: <20250925065433.4180883-1-cedric.hombourger@siemens.com> In-Reply-To: <20250925065433.4180883-1-cedric.hombourger@siemens.com> Accept-Language: de-DE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Evolution 3.56.2-3 x-ms-publictraffictype: Email x-ms-traffictypediagnostic: DU0PR10MB6828:EE_|PAWPR10MB7915:EE_ x-ms-office365-filtering-correlation-id: cc61f44e-6a77-4cb3-7d6f-08ddfc132676 x-ms-exchange-atpmessageproperties: SA x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0;ARA:13230040|10070799003|376014|366016|1800799024|38070700021; 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charset="UTF-8" Content-ID: <17A136C327242F46BAEFBE91C308C73F@EURPRD10.PROD.OUTLOOK.COM> MIME-Version: 1.0 X-OriginatorOrg: siemens.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DU0PR10MB6828.EURPRD10.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-Network-Message-Id: cc61f44e-6a77-4cb3-7d6f-08ddfc132676 X-MS-Exchange-CrossTenant-originalarrivaltime: 25 Sep 2025 09:08:53.5782 (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: QHXAdfu/r0ssqeYS3/YTIEM07QF2ZfqI4JQWet6nZ2uuZBhLFxwi33CYWlHP3PvCJ8xESvQHOCe26eOnuBtPYy7P39Fd/JnlrI7ruUjQHzk= X-MS-Exchange-Transport-CrossTenantHeadersStamped: PAWPR10MB7915 X-Original-Sender: felix.moessbauer@siemens.com X-Original-Authentication-Results: gmr-mx.google.com; dkim=pass header.i=@siemens.com header.s=selector2 header.b=TBOZZNjV; 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 felix.moessbauer@siemens.com designates 2a01:111:f403:c201::1 as permitted sender) smtp.mailfrom=felix.moessbauer@siemens.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=siemens.com X-Original-From: "MOESSBAUER, Felix" Reply-To: "MOESSBAUER, Felix" 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_H3,RCVD_IN_MSPIKE_WL, 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: xMPV3Q9+C3c2 On Thu, 2025-09-25 at 08:54 +0200, 'Cedric Hombourger' via isar-users wrote: > When building root filesystems for foreign architectures with package source > caching enabled, apt operations are executed within the rootfs through QEMU > emulation. This results in significantly degraded performance, particularly > when downloading source packages sequentially. > > This patch series introduces a new wrapper function that enables native > command execution against a rootfs while preserving special mount points > (such as /isar-apt). The approach: > > - Improves build performance for foreign architecture builds > - Maintains filesystem isolation using bubblewrap > - Preserves access to special mount points required by isar > > Additional notes: > - rootfs_cmd may be used to run commands from the host root file-system: > use with extreme care to avoid host contamination problems. > - mmdebstrap already calls apt-get of the host to download packages (in > other words, a build of a bookworm image from a trixie host will > result in mmdebstrap (from trixie), call apt-get (from trixie) to > download bookworm packages. This is the behavior we have before and > after these changes. > - With these changes and when caching of Debian source packages is > enabled/requested, Isar will use apt-get of the host to download > source packages (it will however do this from a bubblewrap'ed > environment to avoid a non-required privilege elevation; Isar has > many but we need to start from somewhere). > > Testing: > - Tested against 9e62337953fbb8371c846c44e8a99d62a8d220ba > - Basic smoke tests performed successfully (citest.py -t fast) > - Performance improvements observed in source package acquisition > - Tested with various foreign architecture configurations Thanks for bringing this up again. I successfully tested this series on (amd64, arm64) x (bookworm, trixie). Tested-by: Felix Moessbauer Felix -- Siemens AG Linux Expert Center Friedrich-Ludwig-Bauer-Str. 3 85748 Garching, Germany -- You received this message because you are subscribed to the Google Groups "isar-users" group. 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