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[96.60.249.169]) by smtp.gmail.com with ESMTPSA id 00721157ae682-7882214cde4sm8931727b3.47.2025.11.13.11.25.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 13 Nov 2025 11:25:29 -0800 (PST) Message-ID: Date: Thu, 13 Nov 2025 14:25:25 -0500 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Demi Marie Obenour Subject: Re: [PATCH 1/3] tools/mount-flatpak: init To: Alyssa Ross , devel@spectrum-os.org References: <20251113120452.65711-1-hi@alyssa.is> Content-Language: en-US In-Reply-To: <20251113120452.65711-1-hi@alyssa.is> Autocrypt: addr=demiobenour@gmail.com; keydata= xsFNBFp+A0oBEADffj6anl9/BHhUSxGTICeVl2tob7hPDdhHNgPR4C8xlYt5q49yB+l2nipd aq+4Gk6FZfqC825TKl7eRpUjMriwle4r3R0ydSIGcy4M6eb0IcxmuPYfbWpr/si88QKgyGSV Z7GeNW1UnzTdhYHuFlk8dBSmB1fzhEYEk0RcJqg4AKoq6/3/UorR+FaSuVwT7rqzGrTlscnT DlPWgRzrQ3jssesI7sZLm82E3pJSgaUoCdCOlL7MMPCJwI8JpPlBedRpe9tfVyfu3euTPLPx wcV3L/cfWPGSL4PofBtB8NUU6QwYiQ9Hzx4xOyn67zW73/G0Q2vPPRst8LBDqlxLjbtx/WLR 6h3nBc3eyuZ+q62HS1pJ5EvUT1vjyJ1ySrqtUXWQ4XlZyoEFUfpJxJoN0A9HCxmHGVckzTRl 5FMWo8TCniHynNXsBtDQbabt7aNEOaAJdE7to0AH3T/Bvwzcp0ZJtBk0EM6YeMLtotUut7h2 Bkg1b//r6bTBswMBXVJ5H44Qf0+eKeUg7whSC9qpYOzzrm7+0r9F5u3qF8ZTx55TJc2g656C 9a1P1MYVysLvkLvS4H+crmxA/i08Tc1h+x9RRvqba4lSzZ6/Tmt60DPM5Sc4R0nSm9BBff0N m0bSNRS8InXdO1Aq3362QKX2NOwcL5YaStwODNyZUqF7izjK4QARAQABzTxEZW1pIE1hcmll IE9iZW5vdXIgKGxvdmVyIG9mIGNvZGluZykgPGRlbWlvYmVub3VyQGdtYWlsLmNvbT7CwXgE EwECACIFAlp+A0oCGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJELKItV//nCLBhr8Q AK/xrb4wyi71xII2hkFBpT59ObLN+32FQT7R3lbZRjVFjc6yMUjOb1H/hJVxx+yo5gsSj5LS 9AwggioUSrcUKldfA/PKKai2mzTlUDxTcF3vKx6iMXKA6AqwAw4B57ZEJoMM6egm57TV19kz PMc879NV2nc6+elaKl+/kbVeD3qvBuEwsTe2Do3HAAdrfUG/j9erwIk6gha/Hp9yZlCnPTX+ VK+xifQqt8RtMqS5R/S8z0msJMI/ajNU03kFjOpqrYziv6OZLJ5cuKb3bZU5aoaRQRDzkFIR 6aqtFLTohTo20QywXwRa39uFaOT/0YMpNyel0kdOszFOykTEGI2u+kja35g9TkH90kkBTG+a EWttIht0Hy6YFmwjcAxisSakBuHnHuMSOiyRQLu43ej2+mDWgItLZ48Mu0C3IG1seeQDjEYP tqvyZ6bGkf2Vj+L6wLoLLIhRZxQOedqArIk/Sb2SzQYuxN44IDRt+3ZcDqsPppoKcxSyd1Ny 2tpvjYJXlfKmOYLhTWs8nwlAlSHX/c/jz/ywwf7eSvGknToo1Y0VpRtoxMaKW1nvH0OeCSVJ itfRP7YbiRVc2aNqWPCSgtqHAuVraBRbAFLKh9d2rKFB3BmynTUpc1BQLJP8+D5oNyb8Ts4x Xd3iV/uD8JLGJfYZIR7oGWFLP4uZ3tkneDfYzsFNBFp+A0oBEAC9ynZI9LU+uJkMeEJeJyQ/ 8VFkCJQPQZEsIGzOTlPnwvVna0AS86n2Z+rK7R/usYs5iJCZ55/JISWd8xD57ue0eB47bcJv VqGlObI2DEG8TwaW0O0duRhDgzMEL4t1KdRAepIESBEA/iPpI4gfUbVEIEQuqdqQyO4GAe+M kD0Hy5JH/0qgFmbaSegNTdQg5iqYjRZ3ttiswalql1/iSyv1WYeC1OAs+2BLOAT2NEggSiVO txEfgewsQtCWi8H1SoirakIfo45Hz0tk/Ad9ZWh2PvOGt97Ka85o4TLJxgJJqGEnqcFUZnJJ riwoaRIS8N2C8/nEM53jb1sH0gYddMU3QxY7dYNLIUrRKQeNkF30dK7V6JRH7pleRlf+wQcN fRAIUrNlatj9TxwivQrKnC9aIFFHEy/0mAgtrQShcMRmMgVlRoOA5B8RTulRLCmkafvwuhs6 dCxN0GNAORIVVFxjx9Vn7OqYPgwiofZ6SbEl0hgPyWBQvE85klFLZLoj7p+joDY1XNQztmfA rnJ9x+YV4igjWImINAZSlmEcYtd+xy3Li/8oeYDAqrsnrOjb+WvGhCykJk4urBog2LNtcyCj kTs7F+WeXGUo0NDhbd3Z6AyFfqeF7uJ3D5hlpX2nI9no/ugPrrTVoVZAgrrnNz0iZG2DVx46 x913pVKHl5mlYQARAQABwsFfBBgBAgAJBQJafgNKAhsMAAoJELKItV//nCLBwNIP/AiIHE8b oIqReFQyaMzxq6lE4YZCZNj65B/nkDOvodSiwfwjjVVE2V3iEzxMHbgyTCGA67+Bo/d5aQGj gn0TPtsGzelyQHipaUzEyrsceUGWYoKXYyVWKEfyh0cDfnd9diAm3VeNqchtcMpoehETH8fr RHnJdBcjf112PzQSdKC6kqU0Q196c4Vp5HDOQfNiDnTf7gZSj0BraHOByy9LEDCLhQiCmr+2 E0rW4tBtDAn2HkT9uf32ZGqJCn1O+2uVfFhGu6vPE5qkqrbSE8TG+03H8ecU2q50zgHWPdHM OBvy3EhzfAh2VmOSTcRK+tSUe/u3wdLRDPwv/DTzGI36Kgky9MsDC5gpIwNbOJP2G/q1wT1o Gkw4IXfWv2ufWiXqJ+k7HEi2N1sree7Dy9KBCqb+ca1vFhYPDJfhP75I/VnzHVssZ/rYZ9+5 1yDoUABoNdJNSGUYl+Yh9Pw9pE3Kt4EFzUlFZWbE4xKL/NPno+z4J9aWemLLszcYz/u3XnbO vUSQHSrmfOzX3cV4yfmjM5lewgSstoxGyTx2M8enslgdXhPthZlDnTnOT+C+OTsh8+m5tos8 HQjaPM01MKBiAqdPgksm1wu2DrrwUi6ChRVTUBcj6+/9IJ81H2P2gJk3Ls3AVIxIffLoY34E +MYSfkEjBz0E8CLOcAw7JIwAaeBT Content-Type: multipart/signed; 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boundary="------------uDI99hVzulLqpkENfNJT6XSo"; protected-headers="v1" From: Demi Marie Obenour To: Alyssa Ross , devel@spectrum-os.org Message-ID: Subject: Re: [PATCH 1/3] tools/mount-flatpak: init References: <20251113120452.65711-1-hi@alyssa.is> In-Reply-To: <20251113120452.65711-1-hi@alyssa.is> Autocrypt-Gossip: addr=hi@alyssa.is; keydata= xsFNBFpSgoYBEAC4xkCYidG2JlRWulUkTWcx0pHFDf3oSbb6Q872Kb3iDChWgluNVz43hva1 3xfDo9foV0GoyfGl/ycSCkXX5hlQr7ir/5FN38E7H/yY6tH8+l68iDgIOcb1qY0OYaxyg+Lz WesfFQedrmwNTbF4L1BtWzrTR5PflDdhDo5VWSguHGJFSclchcr/6UmMb/gOUN+2ElBC2TE2 EKY099phZ6DJZ2aZCsclwKIdCpZzXlEmXPAeaH5om6xo90JYv5+sFji40R0Plqec3WC+jTxy lGca6IbPdOminuUF+GvsR86eVsgh/0XNK7/zus7gyc4PuMUA1rCoeHcWOBDPgmelgCQyJGXd /bXeKuUsGoge58uc7/YNvOh1vfpD3AaEMqAyXfmmUwBnIicml74+2eOpH3Oljfs01g+DhkOB MtpVSZSgaIDvP0WG6cbAxImoUasnmNxEDNskfVmI8bsajPW9bt4z5hiP5Q9G3vE0D5HcIFdM adOz81PpOwNiUXcjtYV1PWZQ56jbSTOf8EBvsB71WwB+XgVWcPzIlY8hAykiHIO87oV3o71U JTAn1Foj7mjSADnY0deleOmar/K5jrK3wvKKM1XlB7PXcGBdkorJC+cbxVsw0ADzMw0c7bVc wEE7OFvHjQiIK1lO+lb1cvGBBY3IZxjsjZdA/VsFHFdAeYlzNQARAQABzRpBbHlzc2EgUm9z cyA8aGlAYWx5c3NhLmlzPsLBlwQTAQgAQQIbAwULCQgHAgYVCAkKCwIEFgIDAQIeAQIXgAIZ ARYhBHVzVtd5u7iIdz5BXnNszfnvUb2XBQJpALHXBQkPJNZRAAoJEHNszfnvUb2X2jEP/AqQ aafKiC7ormevgoCH4QinAKJoXAqiwOIdRK55HOvyhGWjnlzqoK4JTUFVRMR4Vat/APlkjOUk LPXKk+DCn4loFyl7BCLvsk4Xwy7WmXyfSPqjdik8/cjTv/Q4AHTYTpnx7GMC5eTS7ULmUvcf mD/JRr7NM2273Z7dkL3gOeZdnXYOQaGAIIox91qCtmnQhn+V7s3uxvcRl8I2/Qnn3S2veV03 LXSugAXSTdKRa7LBrcSm9TtC/D3qY9kStHiaiB/eAJsOQ0l5yRfax5INorE2DQgBKjbiBcnQ mTX7Rl9LW+U0ibHmKOFG8Zs+zKlmItek49cmqoGOv66RAY6dGUOHoEQgP0EUDJ8xGwActToC lOGZrzcXfrfx0CYlgqYE1VEWgSmtbTW1DBXiZIPKUMLJGhgaIHSKEjYujHd+vGytAMGKQsVQ OwgOMHYWyzAIB/Y6hZGNK8y5fxr468zX876mDdXhYo4dKA7UEOeQOlAIGobTXDRFEC7B/UAj qYbP+qmnyUohCy/Pf04cF0ucpWW2Z00sBL83lauhyQHiLze5OznvOeEkEeXQ6DsJOY0dmrsi 0NJZ1QoyYewXOPmPBNc7IesY1MjrpAnHgeAt1rgEPwTkt4NrRASsPe5JowJcc7CpIdR8eOrG hrw+bEMyoyjk7fN6Hs6MK+hVihMNhUwMzjgEZyd/yxIKKwYBBAGXVQEFAQEHQCVxoiHOlsEo NDKGCbxg4nL3E1CV0MRQCU1hPowd77h3AwEIB8LBfAQYAQoAJgIbDBYhBHVzVtd5u7iIdz5B XnNszfnvUb2XBQJpALHQBQkCT9j5AAoJEHNszfnvUb2XhSMP/0gStw42LjpjVLh+0HKWafs3 T9NJxtefYRbyu4wkkO0dss2pkl9gekZnvgktD0SzIe8AiMszs1rUWMG8zPXVWdMi7tSNm/IR WPa0XZDIoDwJY4T342nCvHeDsfoJnGg8o0nreI2djwO8sc9aeSevm60MQ9AouFBpS6Qw7f/Z LalXH4aWCCtvAO1o95lQXEoH4Lg4qnS6GxYMYi1u3IzrYdUu0By/Ccc5+AOOICgbJnpOoYQI bVDbdjMkj18JxxmpN5amOkPdiDndpzWkWm+oNhGUITYp6EuP1esRb35MgOmFGouvt5UdKpEl Egs2y5h9oR+kiiu9DhrC0UFL2CQ/HdiukCAxADKX3RE9m+mprSbvw7CsYmXUTH6WzPpvxpGx wQq7m2O7uy85u0HyVYkiWQiAfwCbEr1vrFU7gscBW+FcrLIODauovA9eZgA4d+cHRXfzsdKW u/QuVHsABh78LLIq008GcqJChSe4KHrJ5PUjkLnyp/Sshrmuyoy+DwqYky0KK4NtkaWa2o0B TFp+Kk2VCxWA8i/azPvTMzXOWNwqogISp5SwljiEx0hkyf0HvSb3gHfuGbZ+eGfWB+qy2pTD x/YriV5EfqkP+4+1cqXjasrQxyZUW0ULRke0j92Cgt+J722PIcOAb8vdSGF4AXczO+KMtNn9 wGxvGU7TX5ou --------------uDI99hVzulLqpkENfNJT6XSo Content-Type: multipart/mixed; boundary="------------2Xd09uefvRHvSWVyRaduNt3h" --------------2Xd09uefvRHvSWVyRaduNt3h Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 11/13/25 07:04, Alyssa Ross wrote: > Signed-off-by: Alyssa Ross > --- > LICENSES/MPL-2.0.txt | 373 ++++++++++++++++++++++++++++= > tools/default.nix | 7 +- > tools/meson.build | 1 + > tools/mount-flatpak/config | 7 + > tools/mount-flatpak/keyfile.rs | 189 ++++++++++++++ > tools/mount-flatpak/meson.build | 18 ++ > tools/mount-flatpak/metadata.h | 4 + > tools/mount-flatpak/metadata.rs | 47 ++++ > tools/mount-flatpak/mount-flatpak.c | 294 ++++++++++++++++++++++ > 9 files changed, 938 insertions(+), 2 deletions(-) > create mode 100644 LICENSES/MPL-2.0.txt > create mode 100644 tools/mount-flatpak/config > create mode 100644 tools/mount-flatpak/keyfile.rs > create mode 100644 tools/mount-flatpak/meson.build > create mode 100644 tools/mount-flatpak/metadata.h > create mode 100644 tools/mount-flatpak/metadata.rs > create mode 100644 tools/mount-flatpak/mount-flatpak.c >=20 > diff --git a/LICENSES/MPL-2.0.txt b/LICENSES/MPL-2.0.txt > new file mode 100644 > index 0000000..d0a1fa1 > --- /dev/null > +++ b/LICENSES/MPL-2.0.txt > @@ -0,0 +1,373 @@ > +Mozilla Public License Version 2.0 > +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > + > +1. Definitions > +-------------- > + > +1.1. "Contributor" > + means each individual or legal entity that creates, contributes to= > + the creation of, or owns Covered Software. > + > +1.2. "Contributor Version" > + means the combination of the Contributions of others (if any) used= > + by a Contributor and that particular Contributor's Contribution. > + > +1.3. "Contribution" > + means Covered Software of a particular Contributor. > + > +1.4. "Covered Software" > + means Source Code Form to which the initial Contributor has attach= ed > + the notice in Exhibit A, the Executable Form of such Source Code > + Form, and Modifications of such Source Code Form, in each case > + including portions thereof. > + > +1.5. "Incompatible With Secondary Licenses" > + means > + > + (a) that the initial Contributor has attached the notice described= > + in Exhibit B to the Covered Software; or > + > + (b) that the Covered Software was made available under the terms o= f > + version 1.1 or earlier of the License, but not also under the > + terms of a Secondary License. > + > +1.6. "Executable Form" > + means any form of the work other than Source Code Form. > + > +1.7. "Larger Work" > + means a work that combines Covered Software with other material, i= n > + a separate file or files, that is not Covered Software. > + > +1.8. "License" > + means this document. > + > +1.9. "Licensable" > + means having the right to grant, to the maximum extent possible, > + whether at the time of the initial grant or subsequently, any and > + all of the rights conveyed by this License. > + > +1.10. "Modifications" > + means any of the following: > + > + (a) any file in Source Code Form that results from an addition to,= > + deletion from, or modification of the contents of Covered > + Software; or > + > + (b) any new file in Source Code Form that contains any Covered > + Software. > + > +1.11. "Patent Claims" of a Contributor > + means any patent claim(s), including without limitation, method, > + process, and apparatus claims, in any patent Licensable by such > + Contributor that would be infringed, but for the grant of the > + License, by the making, using, selling, offering for sale, having > + made, import, or transfer of either its Contributions or its > + Contributor Version. > + > +1.12. "Secondary License" > + means either the GNU General Public License, Version 2.0, the GNU > + Lesser General Public License, Version 2.1, the GNU Affero General= > + Public License, Version 3.0, or any later versions of those > + licenses. > + > +1.13. "Source Code Form" > + means the form of the work preferred for making modifications. > + > +1.14. "You" (or "Your") > + means an individual or a legal entity exercising rights under this= > + License. For legal entities, "You" includes any entity that > + controls, is controlled by, or is under common control with You. F= or > + purposes of this definition, "control" means (a) the power, direct= > + or indirect, to cause the direction or management of such entity, > + whether by contract or otherwise, or (b) ownership of more than > + fifty percent (50%) of the outstanding shares or beneficial > + ownership of such entity. > + > +2. License Grants and Conditions > +-------------------------------- > + > +2.1. Grants > + > +Each Contributor hereby grants You a world-wide, royalty-free, > +non-exclusive license: > + > +(a) under intellectual property rights (other than patent or trademark= ) > + Licensable by such Contributor to use, reproduce, make available, > + modify, display, perform, distribute, and otherwise exploit its > + Contributions, either on an unmodified basis, with Modifications, = or > + as part of a Larger Work; and > + > +(b) under Patent Claims of such Contributor to make, use, sell, offer > + for sale, have made, import, and otherwise transfer either its > + Contributions or its Contributor Version. > + > +2.2. Effective Date > + > +The licenses granted in Section 2.1 with respect to any Contribution > +become effective for each Contribution on the date the Contributor fir= st > +distributes such Contribution. > + > +2.3. Limitations on Grant Scope > + > +The licenses granted in this Section 2 are the only rights granted und= er > +this License. No additional rights or licenses will be implied from th= e > +distribution or licensing of Covered Software under this License. > +Notwithstanding Section 2.1(b) above, no patent license is granted by = a > +Contributor: > + > +(a) for any code that a Contributor has removed from Covered Software;= > + or > + > +(b) for infringements caused by: (i) Your and any other third party's > + modifications of Covered Software, or (ii) the combination of its > + Contributions with other software (except as part of its Contribut= or > + Version); or > + > +(c) under Patent Claims infringed by Covered Software in the absence o= f > + its Contributions. > + > +This License does not grant any rights in the trademarks, service mark= s, > +or logos of any Contributor (except as may be necessary to comply with= > +the notice requirements in Section 3.4). > + > +2.4. Subsequent Licenses > + > +No Contributor makes additional grants as a result of Your choice to > +distribute the Covered Software under a subsequent version of this > +License (see Section 10.2) or under the terms of a Secondary License (= if > +permitted under the terms of Section 3.3). > + > +2.5. Representation > + > +Each Contributor represents that the Contributor believes its > +Contributions are its original creation(s) or it has sufficient rights= > +to grant the rights to its Contributions conveyed by this License. > + > +2.6. Fair Use > + > +This License is not intended to limit any rights You have under > +applicable copyright doctrines of fair use, fair dealing, or other > +equivalents. > + > +2.7. Conditions > + > +Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted= > +in Section 2.1. > + > +3. Responsibilities > +------------------- > + > +3.1. Distribution of Source Form > + > +All distribution of Covered Software in Source Code Form, including an= y > +Modifications that You create or to which You contribute, must be unde= r > +the terms of this License. You must inform recipients that the Source > +Code Form of the Covered Software is governed by the terms of this > +License, and how they can obtain a copy of this License. You may not > +attempt to alter or restrict the recipients' rights in the Source Code= > +Form. > + > +3.2. Distribution of Executable Form > + > +If You distribute Covered Software in Executable Form then: > + > +(a) such Covered Software must also be made available in Source Code > + Form, as described in Section 3.1, and You must inform recipients = of > + the Executable Form how they can obtain a copy of such Source Code= > + Form by reasonable means in a timely manner, at a charge no more > + than the cost of distribution to the recipient; and > + > +(b) You may distribute such Executable Form under the terms of this > + License, or sublicense it under different terms, provided that the= > + license for the Executable Form does not attempt to limit or alter= > + the recipients' rights in the Source Code Form under this License.= > + > +3.3. Distribution of a Larger Work > + > +You may create and distribute a Larger Work under terms of Your choice= , > +provided that You also comply with the requirements of this License fo= r > +the Covered Software. If the Larger Work is a combination of Covered > +Software with a work governed by one or more Secondary Licenses, and t= he > +Covered Software is not Incompatible With Secondary Licenses, this > +License permits You to additionally distribute such Covered Software > +under the terms of such Secondary License(s), so that the recipient of= > +the Larger Work may, at their option, further distribute the Covered > +Software under the terms of either this License or such Secondary > +License(s). > + > +3.4. Notices > + > +You may not remove or alter the substance of any license notices > +(including copyright notices, patent notices, disclaimers of warranty,= > +or limitations of liability) contained within the Source Code Form of > +the Covered Software, except that You may alter any license notices to= > +the extent required to remedy known factual inaccuracies. > + > +3.5. Application of Additional Terms > + > +You may choose to offer, and to charge a fee for, warranty, support, > +indemnity or liability obligations to one or more recipients of Covere= d > +Software. However, You may do so only on Your own behalf, and not on > +behalf of any Contributor. You must make it absolutely clear that any > +such warranty, support, indemnity, or liability obligation is offered = by > +You alone, and You hereby agree to indemnify every Contributor for any= > +liability incurred by such Contributor as a result of warranty, suppor= t, > +indemnity or liability terms You offer. You may include additional > +disclaimers of warranty and limitations of liability specific to any > +jurisdiction. > + > +4. Inability to Comply Due to Statute or Regulation > +--------------------------------------------------- > + > +If it is impossible for You to comply with any of the terms of this > +License with respect to some or all of the Covered Software due to > +statute, judicial order, or regulation then You must: (a) comply with > +the terms of this License to the maximum extent possible; and (b) > +describe the limitations and the code they affect. Such description mu= st > +be placed in a text file included with all distributions of the Covere= d > +Software under this License. Except to the extent prohibited by statut= e > +or regulation, such description must be sufficiently detailed for a > +recipient of ordinary skill to be able to understand it. > + > +5. Termination > +-------------- > + > +5.1. The rights granted under this License will terminate automaticall= y > +if You fail to comply with any of its terms. However, if You become > +compliant, then the rights granted under this License from a particula= r > +Contributor are reinstated (a) provisionally, unless and until such > +Contributor explicitly and finally terminates Your grants, and (b) on = an > +ongoing basis, if such Contributor fails to notify You of the > +non-compliance by some reasonable means prior to 60 days after You hav= e > +come back into compliance. Moreover, Your grants from a particular > +Contributor are reinstated on an ongoing basis if such Contributor > +notifies You of the non-compliance by some reasonable means, this is t= he > +first time You have received notice of non-compliance with this Licens= e > +from such Contributor, and You become compliant prior to 30 days after= > +Your receipt of the notice. > + > +5.2. If You initiate litigation against any entity by asserting a pate= nt > +infringement claim (excluding declaratory judgment actions, > +counter-claims, and cross-claims) alleging that a Contributor Version > +directly or indirectly infringes any patent, then the rights granted t= o > +You by any and all Contributors for the Covered Software under Section= > +2.1 of this License shall terminate. > + > +5.3. In the event of termination under Sections 5.1 or 5.2 above, all > +end user license agreements (excluding distributors and resellers) whi= ch > +have been validly granted by You or Your distributors under this Licen= se > +prior to termination shall survive termination. > + > +**********************************************************************= ** > +* = * > +* 6. Disclaimer of Warranty = * > +* ------------------------- = * > +* = * > +* Covered Software is provided under this License on an "as is" = * > +* basis, without warranty of any kind, either expressed, implied, or = * > +* statutory, including, without limitation, warranties that the = * > +* Covered Software is free of defects, merchantable, fit for a = * > +* particular purpose or non-infringing. The entire risk as to the = * > +* quality and performance of the Covered Software is with You. = * > +* Should any Covered Software prove defective in any respect, You = * > +* (not any Contributor) assume the cost of any necessary servicing, = * > +* repair, or correction. This disclaimer of warranty constitutes an = * > +* essential part of this License. No use of any Covered Software is = * > +* authorized under this License except under this disclaimer. = * > +* = * > +**********************************************************************= ** > + > +**********************************************************************= ** > +* = * > +* 7. Limitation of Liability = * > +* -------------------------- = * > +* = * > +* Under no circumstances and under no legal theory, whether tort = * > +* (including negligence), contract, or otherwise, shall any = * > +* Contributor, or anyone who distributes Covered Software as = * > +* permitted above, be liable to You for any direct, indirect, = * > +* special, incidental, or consequential damages of any character = * > +* including, without limitation, damages for lost profits, loss of = * > +* goodwill, work stoppage, computer failure or malfunction, or any = * > +* and all other commercial damages or losses, even if such party = * > +* shall have been informed of the possibility of such damages. This = * > +* limitation of liability shall not apply to liability for death or = * > +* personal injury resulting from such party's negligence to the = * > +* extent applicable law prohibits such limitation. Some = * > +* jurisdictions do not allow the exclusion or limitation of = * > +* incidental or consequential damages, so this exclusion and = * > +* limitation may not apply to You. = * > +* = * > +**********************************************************************= ** > + > +8. Litigation > +------------- > + > +Any litigation relating to this License may be brought only in the > +courts of a jurisdiction where the defendant maintains its principal > +place of business and such litigation shall be governed by laws of tha= t > +jurisdiction, without reference to its conflict-of-law provisions. > +Nothing in this Section shall prevent a party's ability to bring > +cross-claims or counter-claims. > + > +9. Miscellaneous > +---------------- > + > +This License represents the complete agreement concerning the subject > +matter hereof. If any provision of this License is held to be > +unenforceable, such provision shall be reformed only to the extent > +necessary to make it enforceable. Any law or regulation which provides= > +that the language of a contract shall be construed against the drafter= > +shall not be used to construe this License against a Contributor. > + > +10. Versions of the License > +--------------------------- > + > +10.1. New Versions > + > +Mozilla Foundation is the license steward. Except as provided in Secti= on > +10.3, no one other than the license steward has the right to modify or= > +publish new versions of this License. Each version will be given a > +distinguishing version number. > + > +10.2. Effect of New Versions > + > +You may distribute the Covered Software under the terms of the version= > +of the License under which You originally received the Covered Softwar= e, > +or under the terms of any subsequent version published by the license > +steward. > + > +10.3. Modified Versions > + > +If you create software not governed by this License, and you want to > +create a new license for such software, you may create and use a > +modified version of this License if you rename the license and remove > +any references to the name of the license steward (except to note that= > +such modified license differs from this License). > + > +10.4. Distributing Source Code Form that is Incompatible With Secondar= y > +Licenses > + > +If You choose to distribute Source Code Form that is Incompatible With= > +Secondary Licenses under the terms of this version of the License, the= > +notice described in Exhibit B of this License must be attached. > + > +Exhibit A - Source Code Form License Notice > +------------------------------------------- > + > + This Source Code Form is subject to the terms of the Mozilla Public > + License, v. 2.0. If a copy of the MPL was not distributed with this > + file, You can obtain one at https://mozilla.org/MPL/2.0/. > + > +If it is not possible or desirable to put the notice in a particular > +file, then You may include the notice in a location (such as a LICENSE= > +file in a relevant directory) where a recipient would be likely to loo= k > +for such a notice. > + > +You may add additional accurate notices of copyright ownership. > + > +Exhibit B - "Incompatible With Secondary Licenses" Notice > +--------------------------------------------------------- > + > + This Source Code Form is "Incompatible With Secondary Licenses", as > + defined by the Mozilla Public License, v. 2.0. > diff --git a/tools/default.nix b/tools/default.nix > index 27d4b82..27741b3 100644 > --- a/tools/default.nix > +++ b/tools/default.nix > @@ -74,6 +74,7 @@ stdenv.mkDerivation (finalAttrs: { > ./xdg-desktop-portal-spectrum > ] ++ lib.optionals hostSupport [ > ./lsvm > + ./mount-flatpak > ./sd-notify-adapter.c > ./start-vmm > ./subprojects > @@ -88,8 +89,10 @@ stdenv.mkDerivation (finalAttrs: { > ++ lib.optionals (appSupport || driverSupport) [ pkg-config ] > ++ lib.optionals hostSupport [ rustc ] > ++ lib.optionals driverSupport [ llvmPackages.clang-unwrapped ]; > - buildInputs =3D lib.optionals appSupport [ dbus ] > - ++ lib.optionals driverSupport [ libbpf linuxHeaders ]; > + buildInputs =3D with stdenv.hostPlatform; lib.optionals appSupport [= dbus ] > + ++ lib.optionals driverSupport [ libbpf linuxHeaders ] > + # Workaround for .= > + ++ lib.optionals (hostSupport && isMusl && isStatic) [ llvmPackage= s.libunwind ]; > =20 > postPatch =3D lib.optionals hostSupport (lib.concatMapStringsSep "\n= " (crate: '' > mkdir -p subprojects/packagecache > diff --git a/tools/meson.build b/tools/meson.build > index d465e99..c024ca6 100644 > --- a/tools/meson.build > +++ b/tools/meson.build > @@ -30,6 +30,7 @@ if get_option('host') > install: true) > =20 > subdir('lsvm') > + subdir('mount-flatpak') > subdir('start-vmm') > endif > =20 > diff --git a/tools/mount-flatpak/config b/tools/mount-flatpak/config > new file mode 100644 > index 0000000..b3c2bee > --- /dev/null > +++ b/tools/mount-flatpak/config > @@ -0,0 +1,7 @@ > +# SPDX-License-Identifier: CC0-1.0 > +# SPDX-FileCopyrightText: 2025 Alyssa Ross > + > +[core] > +repo_version=3D1 > +mode=3Dbare-user-only > +min-free-space-size=3D500MB > diff --git a/tools/mount-flatpak/keyfile.rs b/tools/mount-flatpak/keyfi= le.rs > new file mode 100644 > index 0000000..fa746b3 > --- /dev/null > +++ b/tools/mount-flatpak/keyfile.rs > @@ -0,0 +1,189 @@ > +// Copyright 2021 System76 > +// SPDX-FileCopyrightText: 2025 Alyssa Ross > +// SPDX-License-Identifier: MPL-2.0 > + > +// Adapted from freedesktop-desktop-entry 0.7.19. > + > +use std::collections::BTreeMap; > +use std::fmt::{self, Display, Formatter}; > + > +type Group =3D BTreeMap; > + > +#[derive(Debug)] > +pub enum DecodeError { > + KeyValueWithoutAGroup, > + InvalidKey, > + InvalidValue, > +} > + > +impl Display for DecodeError { > + fn fmt(&self, f: &mut Formatter) -> fmt::Result { > + match self { > + Self::KeyValueWithoutAGroup =3D> write!(f, "key/value with= out a group"), > + Self::InvalidKey =3D> write!(f, "invalid key"), > + Self::InvalidValue =3D> write!(f, "invalid value"), > + } > + } > +} > + > +pub fn parse(input: &str) -> Result, DecodeErr= or> { > + let mut groups =3D BTreeMap::default(); > + let mut active_group: Option =3D None; > + let mut active_keys: Option =3D None; > + > + for line in input.lines() { > + process_line(line, &mut groups, &mut active_group, &mut active= _keys)?; > + } > + > + if let Some(active_keys) =3D active_keys.take() { > + match &mut active_group { > + Some(active_group) =3D> { > + active_group > + .group > + .insert(active_keys.key_name, active_keys.value); > + } > + None =3D> return Err(DecodeError::KeyValueWithoutAGroup), > + } > + } > + > + if let Some(mut group) =3D active_group.take() { > + groups > + .entry(group.group_name) > + .or_default() > + .append(&mut group.group); > + } > + > + Ok(groups) > +} > + > +struct ActiveGroup { > + group_name: String, > + group: Group, > +} > + > +struct ActiveKeys { > + key_name: String, > + value: String, > +} > + > +#[inline(never)] > +fn process_line( > + line: &str, > + groups: &mut BTreeMap, > + active_group: &mut Option, > + active_keys: &mut Option, > +) -> Result<(), DecodeError> { > + if line.trim().is_empty() || line.starts_with('#') { > + return Ok(()); > + } > + > + let line_bytes =3D line.as_bytes(); > + > + // if group > + if line_bytes[0] =3D=3D b'[' { > + if let Some(end) =3D line_bytes[1..].iter().rposition(|&b| b =3D= =3D b']') { > + let group_name =3D &line[1..end + 1]; > + > + if let Some(active_keys) =3D active_keys.take() { > + match active_group { > + Some(active_group) =3D> { > + active_group > + .group > + .insert(active_keys.key_name, active_keys.= value); > + } > + None =3D> return Err(DecodeError::KeyValueWithoutA= Group), > + } > + } > + > + if let Some(mut group) =3D active_group.take() { > + groups > + .entry(group.group_name) > + .or_default() > + .append(&mut group.group); > + } > + > + active_group.replace(ActiveGroup { > + group_name: group_name.to_string(), > + group: Group::default(), > + }); > + } > + } > + // else, if value > + else if let Some(delimiter) =3D line_bytes.iter().position(|&b| b = =3D=3D b'=3D') { > + let key =3D &line[..delimiter]; > + let value =3D format_value(&line[delimiter + 1..])?; > + > + if key.is_empty() { > + return Err(DecodeError::InvalidKey); > + } > + > + if let Some(active_keys) =3D active_keys.take() { > + match active_group { > + Some(active_group) =3D> { > + active_group > + .group > + .insert(active_keys.key_name, active_keys.valu= e); > + } > + None =3D> return Err(DecodeError::KeyValueWithoutAGrou= p), > + } > + } > + active_keys.replace(ActiveKeys { > + key_name: key.trim().to_string(), > + value, > + }); > + } > + Ok(()) > +} > + > +// https://specifications.freedesktop.org/desktop-entry-spec/latest/va= lue-types.html > +#[inline] > +fn format_value(input: &str) -> Result { > + let input =3D if let Some(input) =3D input.strip_prefix(" ") { > + input > + } else { > + input > + }; > + > + let mut res =3D String::with_capacity(input.len()); > + > + let mut last: usize =3D 0; > + > + for (i, v) in input.as_bytes().iter().enumerate() { > + if *v !=3D b'\\' { > + continue; > + } > + > + // edge case for // > + if last > i { > + continue; > + } > + > + // when there is an \ at the end > + if input.len() <=3D i + 1 { > + return Err(DecodeError::InvalidValue); > + } > + > + if last < i { > + res.push_str(&input[last..i]); > + } > + > + last =3D i + 2; > + > + match input.as_bytes()[i + 1] { > + b's' =3D> res.push(' '), > + b'n' =3D> res.push('\n'), > + b't' =3D> res.push('\t'), > + b'r' =3D> res.push('\r'), > + b'\\' =3D> res.push('\\'), > + _ =3D> { > + return Err(DecodeError::InvalidValue); > + } > + } > + } > + > + if last < input.len() { > + res.push_str(&input[last..input.len()]); > + } > + > + Ok(res) > +} > diff --git a/tools/mount-flatpak/meson.build b/tools/mount-flatpak/meso= n.build > new file mode 100644 > index 0000000..e0c0a85 > --- /dev/null > +++ b/tools/mount-flatpak/meson.build > @@ -0,0 +1,18 @@ > +# SPDX-License-Identifier: EUPL-1.2+ > +# SPDX-FileCopyrightText: 2025 Alyssa Ross > + > +rust_lib =3D static_library('metadata', 'metadata.rs', rust_abi : 'c')= > + > +conf_data =3D configuration_data() > +conf_data.set_quoted('CONFIG_PATH', > + get_option('prefix') / get_option('datadir') / 'spectrum/flatpak-con= fig') > +configure_file(output : 'config.h', configuration : conf_data) > + > +executable('mount-flatpak', 'mount-flatpak.c', > + c_args : '-D_GNU_SOURCE', > + link_with : rust_lib, > + install : true) > + > +install_data('config', > + rename : 'flatpak-config', > + install_dir : get_option('datadir') / 'spectrum') > diff --git a/tools/mount-flatpak/metadata.h b/tools/mount-flatpak/metad= ata.h > new file mode 100644 > index 0000000..d6441b7 > --- /dev/null > +++ b/tools/mount-flatpak/metadata.h > @@ -0,0 +1,4 @@ > +// SPDX-License-Identifier: EUPL-1.2+ > +// SPDX-FileCopyrightText: 2025 Alyssa Ross > + > +void extract_runtime(int metadata, char *runtime); > diff --git a/tools/mount-flatpak/metadata.rs b/tools/mount-flatpak/meta= data.rs > new file mode 100644 > index 0000000..0398416 > --- /dev/null > +++ b/tools/mount-flatpak/metadata.rs > @@ -0,0 +1,47 @@ > +// SPDX-License-Identifier: EUPL-1.2+ > +// SPDX-FileCopyrightText: 2025 Alyssa Ross > + > +mod keyfile; > + > +use std::env::args_os; > +use std::ffi::OsString; > +use std::fs::File; > +use std::io::{read_to_string, stderr, Write}; > +use std::os::fd::OwnedFd; > +use std::os::unix::prelude::*; > +use std::process::exit; > + > +use keyfile::parse; > + > +fn extract_runtime(mut metadata: File) -> Result { > + let metadata =3D read_to_string(&mut metadata).map_err(|e| e.to_st= ring())?; > + let group =3D parse(&metadata).map_err(|e| e.to_string())?; > + let application =3D group > + .get("Application") > + .ok_or_else(|| "Application group missing".to_string())?; > + Ok(application > + .get("runtime") > + .ok_or_else(|| "runtime property missing".to_string())? > + .clone()) > +} > + > +// SAFETY: we do not expect "extract_runtime" to collide with another = symbol. > +#[unsafe(export_name =3D "extract_runtime")] > +pub extern "C" fn extract_runtime_c(metadata: OwnedFd, out: &mut [u8; = 256]) { > + let error =3D match extract_runtime(metadata.into()) { > + Err(e) =3D> e, > + Ok(runtime) if runtime.len() >=3D out.len() =3D> "runtime name= too long".to_string(), > + Ok(runtime) =3D> { > + out[..runtime.len()].copy_from_slice(runtime.as_bytes()); > + out[runtime.len()] =3D 0; > + return; > + } > + }; > + > + let prog_name =3D args_os() > + .next() > + .unwrap_or_else(|| OsString::from("mount-flatpak")); > + stderr().write_all(prog_name.as_bytes()).unwrap(); > + eprintln!(": {error}"); > + exit(1); > +} > diff --git a/tools/mount-flatpak/mount-flatpak.c b/tools/mount-flatpak/= mount-flatpak.c > new file mode 100644 > index 0000000..8e09d1d > --- /dev/null > +++ b/tools/mount-flatpak/mount-flatpak.c > @@ -0,0 +1,294 @@ > +// SPDX-License-Identifier: EUPL-1.2+ > +// SPDX-FileCopyrightText: 2025 Alyssa Ross > + > +#include "config.h" > +#include "metadata.h" > + > +#include > +#include > +#include > +#include > +#include > +#include > + > +#include > +#include > + > +#include > +#include > + > +static void bind_mount(int source_fd, const char *source, > + int target_fd, const char *target) > +{ > + int source_tree =3D syscall(SYS_open_tree, source_fd, source, > + AT_EMPTY_PATH | OPEN_TREE_CLOEXEC | > + OPEN_TREE_CLONE | AT_RECURSIVE);> +> + if (= source_tree =3D=3D -1) > + err(EXIT_FAILURE, "open_tree %s", source); > + if (syscall(SYS_move_mount, source_tree, "", target_fd, target, > + MOVE_MOUNT_F_EMPTY_PATH | MOVE_MOUNT_T_EMPTY_PATH) =3D=3D= -1) > + err(EXIT_FAILURE, "move_mount"); Missing checks that target does not contain "/" and is not "." or "..". > +} > + > +static int mkdir_openat(int dirfd, const char *path, mode_t mode) > +{ > + int fd; > + if (mkdirat(dirfd, path, mode) =3D=3D -1) > + err(EXIT_FAILURE, "mkdirat %s", path); > + if ((fd =3D openat(dirfd, path, O_PATH | O_DIRECTORY | O_CLOEXEC)) =3D= =3D -1) > + err(EXIT_FAILURE, "openat %s", path); > + return fd; > +} > + > +// By failing on EEXIST when creating each directory, > +// we can be sure we don't end up following .. components. > +static int mkdirs_beneath(int root, const char *target) > +{ > + int last, fd =3D root; Missing check for target being absolute. if (*target =3D=3D '/') errx(EXIT_FAILURE, "Path is absolute"); if (*target =3D=3D '\0') errx(EXIT_FAILURE, "Path is empty"); > + size_t len =3D strlen(target); > + char *end, *path =3D malloc(len + 1), *dir =3D path; > + if (!dir) > + err(EXIT_FAILURE, "malloc %zu", len + 1); > + memcpy(dir, target, len + 1); > + > + do { > + // Find next non-empty directory component > + end =3D strchrnul(dir, '/'); > + while (*(end + 1) =3D=3D '/') > + end++; Off-by-1 overread: should check *end and not *(end + 1). Also, this skips past the NUL terminator. This fixes the bug and adds the missing "." and ".." checks: end =3D strchrnul(dir, '/'); if (end - dir =3D=3D 1 && dir[0] =3D=3D '.') errx(EXIT_FAILURE, "path component is '.'"); if (end - dir =3D=3D 2 && dir[0] =3D=3D '.' && dir[1] =3D=3D '.') errx(EXIT_FAILURE, "path component is '..'"); if (*end !=3D '\0') { while (end[1] =3D=3D '/') end++; } else { end--; } However, the `dir =3D end + 1` at the end of the loop can be removed while making the code simpler. I would write: end =3D strchrnul(dir, '/'); if (end - dir =3D=3D 1 && dir[0] =3D=3D '.') errx(EXIT_FAILURE, "path component is '.'"); if (end - dir =3D=3D 2 && dir[0] =3D=3D '.' && dir[1] =3D=3D '.') errx(EXIT_FAILURE, "path component is '..'"); if (*end !=3D '\0') { // Replace path separator with string terminator. *end =3D '\0'; // Advance until end does not point to a '/'. while (*++end =3D=3D '/') {} } This means that *end now points to the start of the next component or the= NUL terminator, so the following changes are needed. - Removing `*end =3D 0`. - Replacing `dir =3D end + 1` with `dir =3D end`. Feel free to write the while loop in a different way if it is too code-golfed :) > + // Replace path separator with string terminator. > + *end =3D 0; Missing check for a path component being "." or "..". > + // Update fd to a new child, and close the previous one > + // unless it was the one provided by the caller. > + last =3D fd; > + fd =3D mkdir_openat(fd, dir, 0755); > + if (last !=3D root) > + close(last); > + > + dir =3D end + 1; > + } while (end !=3D &path[len]); This is slightly fragile against bugs. I generally prefer: } while (end < path + len); so that if end goes past the terminator the loop will exit. Alternatively, } while (*end !=3D '\0'); could be used, but that also assumes the code never advances the pointer past the NUL terminator. > + free(path); > + return fd; > +} > + > +static int openat_beneath(int dirfd, const char *path, int flags) > +{ > + struct open_how how =3D { > + .flags =3D flags, > + .resolve =3D RESOLVE_BENEATH | RESOLVE_NO_MAGICLINKS, Should this also include RESOLVE_NO_XDEV and/or RESOLVE_NO_SYMLINKS? I don't think that following symlinks is the intended behavior here, and crossing filesystems also makes no sense. > + }; > + int r =3D syscall(SYS_openat2, dirfd, path, &how, sizeof how); > + if (r =3D=3D -1) > + err(EXIT_FAILURE, "openat2 %s", path); > + return r; > +} > + > +static int resolve_link(int dirfd, const char *path, char **target) > +{ > + int r; > + struct stat sb; > + if (fstatat(dirfd, path, &sb, AT_SYMLINK_NOFOLLOW) =3D=3D -1) > + err(EXIT_FAILURE, "fstatat %s", path); > + if (!(*target =3D malloc(sb.st_size + 1))) > + err(EXIT_FAILURE, "malloc %zu", sb.st_size + 1); > + if ((r =3D readlinkat(dirfd, path, *target, sb.st_size + 1)) <=3D -1)= > + err(EXIT_FAILURE, "readlinkat %s", path); > + if (r =3D=3D sb.st_size + 1) > + errx(EXIT_FAILURE, "symlink target lengthened"); What about this? if (r > sb.st_size) errx(EXIT_FAILURE, "symlink target lengthened"); That might get rid of the clang static analyzer warning too. > + (*target)[r] =3D 0; // NOLINT(clang-analyzer-security.ArrayBound) > + return openat_beneath(dirfd, *target, O_PATH | O_CLOEXEC | O_DIRECTOR= Y); > +} Linux will follow symbolic links in openat2() with RESOLVE_BENEATH, unless RESOLVE_NO_SYMLINKS is set. It still checks that the resolved path is underneath the provided dirfd. As-is, you also have a time-of-check to time-of-use race, though losing it will just cause the program to fail with an error. > +static void write_to(int dirfd, const char *path, const char *text) > +{ > + FILE *file; > + size_t len =3D strlen(text); > + int f =3D openat(dirfd, path, > + O_WRONLY | O_CLOEXEC | O_NOFOLLOW | O_CREAT, 0644); > + > + if (f =3D=3D -1) > + err(EXIT_FAILURE, "openat %s", path); > + if (!(file =3D fdopen(f, "w"))) > + err(EXIT_FAILURE, "fdopen %s", path); > + > + if (fwrite(text, 1, len, file) !=3D len) > + err(EXIT_FAILURE, "fwrite"); > + if (fclose(file) =3D=3D EOF) > + err(EXIT_FAILURE, "fclose"); > +} I don't think it is necessary to use fwrite() instead of write() here. > +static void set_up_app_dir(int source_commit_dir, int installation_dir= , > + const char *id, const char *arch, > + const char *branch, const char *commit) > +{ > + int app_dir, id_dir, arch_dir, branch_dir; > + > + app_dir =3D mkdir_openat(installation_dir, "app", 0755); > + > + id_dir =3D mkdir_openat(app_dir, id, 0755); > + close(app_dir); > + > + arch_dir =3D mkdir_openat(id_dir, arch, 0755); > + close(id_dir); > + > + branch_dir =3D mkdir_openat(arch_dir, branch, 0755); > + close(arch_dir); > + > + if (mkdirat(branch_dir, commit, 0755) =3D=3D -1) > + err(EXIT_FAILURE, "mkdirat %s", commit); Should there be a check that `commit` does not have control characters? > + bind_mount(source_commit_dir, "", branch_dir, commit); > + close(branch_dir); > +} > + > +static int mount_app(int source_installation_dir, int target_installat= ion_dir, > + int params_dir, const char *id) > +{ > + char *arch_and_branch, *arch_end, *commit; > + int app_dir, id_dir, branch_dir, commit_dir; > + > + app_dir =3D openat_beneath(source_installation_dir, "app", > + O_PATH | O_CLOEXEC | O_DIRECTORY); > + id_dir =3D openat_beneath(app_dir, id, O_PATH | O_CLOEXEC | O_DIRECTO= RY); > + close(app_dir); > + > + branch_dir =3D resolve_link(id_dir, "current", &arch_and_branch); > + close(id_dir); > + > + commit_dir =3D resolve_link(branch_dir, "active", &commit); > + close(branch_dir); > + > + if (!(arch_end =3D strchr(arch_and_branch, '/'))) > + errx(EXIT_FAILURE, "unexpected current format"); > + *arch_end =3D 0; > + > + set_up_app_dir(commit_dir, target_installation_dir, id, > + arch_and_branch, arch_end + 1, commit); > + write_to(params_dir, "commit", commit); > + write_to(params_dir, "arch", arch_and_branch); > + write_to(params_dir, "branch", arch_end + 1); > + > + free(arch_and_branch); > + free(commit); > + return commit_dir; > +} > + > +static void set_up_runtime_dir(int source_commit_dir, int installation= _dir, > + const char *ref, const char *commit) > +{ > + int runtime_dir, branch_dir; > + > + runtime_dir =3D mkdir_openat(installation_dir, "runtime", 0755); > + > + branch_dir =3D mkdirs_beneath(runtime_dir, ref); > + close(runtime_dir); > + > + if (mkdirat(branch_dir, commit, 0755) =3D=3D -1) > + err(EXIT_FAILURE, "mkdirat %s", commit); > + bind_mount(source_commit_dir, "", branch_dir, commit); > + close(branch_dir); > +} > + > +static void mount_runtime(int source_installation_dir, > + int target_installation_dir, > + int params_dir, int app_commit_dir) > +{ > + char runtime[256], *commit; > + int runtime_dir, branch_dir, commit_dir; > + int metadata =3D openat_beneath(app_commit_dir, "metadata", > + O_RDONLY | O_CLOEXEC); Use O_PATH in case this is something weird like a named pipe. After checking that it is a regular file, reopen via /proc/self/fd. > + extract_runtime(metadata, runtime); > + > + runtime_dir =3D openat_beneath(source_installation_dir, "runtime", > + O_PATH | O_CLOEXEC | O_DIRECTORY); > + > + branch_dir =3D openat_beneath(runtime_dir, runtime, > + O_PATH | O_CLOEXEC | O_DIRECTORY); > + close(runtime_dir); > + > + commit_dir =3D resolve_link(branch_dir, "active", &commit); > + close(branch_dir); > + > + set_up_runtime_dir(commit_dir, target_installation_dir, > + runtime, commit); > + write_to(params_dir, "runtime-commit", commit); > + > + free(commit); > + close(commit_dir); > +} > + > +static void set_up_repo(int target_installation_dir) > +{ > + int config; > + > + if (mkdirat(target_installation_dir, "repo", 0755) =3D=3D -1) > + err(EXIT_FAILURE, "mkdir repo"); > + if (mkdirat(target_installation_dir, "repo/objects", 0755) =3D=3D -1)= > + err(EXIT_FAILURE, "mkdir repo/objects"); > + if (mkdirat(target_installation_dir, "repo/tmp", 0775) =3D=3D -1) > + err(EXIT_FAILURE, "mkdir repo/tmp"); > + if (mkdirat(target_installation_dir, "repo/tmp/cache", 0775) =3D=3D -= 1) > + err(EXIT_FAILURE, "mkdir repo/tmp/cache"); Should this use mkdir_openat()? Alternative, you can use openat() on the just-created subdirectory and use that FD for subsequent operation= s, including using mkdir_openat() for tmp/cache. > + if ((config =3D openat(target_installation_dir, "repo/config", > + O_WRONLY | O_CLOEXEC | O_NOFOLLOW | O_CREAT, > + 0644)) =3D=3D -1) > + err(EXIT_FAILURE, "openat repo/config"); Should this use O_EXCL? > + bind_mount(AT_FDCWD, CONFIG_PATH, config, ""); > + > + close(config); > +} > + > +int main(int, char **argv) > +{ > + char *installation_path, *id; > + int params_dir, source_installation_dir, target_installation_dir, > + app_commit_dir; > + struct mount_attr attr =3D { > + .attr_clr =3D MOUNT_ATTR_NOSYMFOLLOW, > + .attr_set =3D MOUNT_ATTR_RDONLY | MOUNT_ATTR_NODEV, > + }; > + > + if (!(installation_path =3D *++argv)) > + errx(EXIT_FAILURE, "missing installation path"); > + if (!(id =3D *++argv)) > + errx(EXIT_FAILURE, "missing app ID"); > + > + if ((source_installation_dir =3D open(installation_path, > + O_PATH | O_CLOEXEC | O_DIRECTORY)= ) =3D=3D -1) > + err(EXIT_FAILURE, "open %s", installation_path); > + > + params_dir =3D mkdir_openat(AT_FDCWD, "params", 0755); > + write_to(params_dir, "id", id); > + > + if (mkdir("flatpak", 0755) =3D=3D -1) > + err(EXIT_FAILURE, "mkdir flatpak"); > + if ((target_installation_dir =3D syscall(SYS_open_tree, AT_FDCWD, > + "flatpak", > + AT_EMPTY_PATH | OPEN_TREE_CLON= E | > + OPEN_TREE_CLOEXEC | > + AT_RECURSIVE)) =3D=3D -1) > + err(EXIT_FAILURE, "open_tree flatpak"); I don't know if the "flatpak" directory is visible in the filesystem at this point. However, it is at least not visible to untrusted code. Therefore, I recommend performing all the calls to mkdir() and write_to()= before anything is bind-mounted into this tree. > + app_commit_dir =3D mount_app(source_installation_dir, > + target_installation_dir, params_dir, id); > + mount_runtime(source_installation_dir, target_installation_dir, > + params_dir, app_commit_dir); > + close(source_installation_dir); > + close(params_dir); > + > + set_up_repo(target_installation_dir); > + > + if (syscall(SYS_mount_setattr, target_installation_dir, "", > + AT_EMPTY_PATH | AT_RECURSIVE, &attr, sizeof attr) =3D=3D = -1) > + err(EXIT_FAILURE, "mount_setattr flatpak"); > + if (syscall(SYS_move_mount, target_installation_dir, "", > + AT_FDCWD, "flatpak", MOVE_MOUNT_F_EMPTY_PATH) =3D=3D -1) > + err(EXIT_FAILURE, "move_mount flatpak flatpak"); > + close(target_installation_dir); > +} >=20 > base-commit: 4b89596e112d26c4bd60bc46bb45c5d9a0875314--=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------2Xd09uefvRHvSWVyRaduNt3h Content-Type: 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