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[96.60.249.169]) by smtp.gmail.com with ESMTPSA id 00721157ae682-78ad0d5fe7fsm19111357b3.17.2025.11.28.13.39.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 28 Nov 2025 13:39:37 -0800 (PST) Message-ID: Date: Fri, 28 Nov 2025 16:39:33 -0500 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] scripts/make-gpt.sh: allow setting partition size To: Alyssa Ross References: <20251128132227.243596-2-hi@alyssa.is> <87ms45oo6b.fsf@alyssa.is> <373ef2eb-d230-431a-a22c-1a83348d5075@gmail.com> <87jyz9onmc.fsf@alyssa.is> <08f97c52-d6e4-424a-99dc-f29f37515fcb@gmail.com> Content-Language: en-US From: Demi Marie Obenour 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 In-Reply-To: Content-Type: multipart/signed; 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boundary="------------9nH9mQ5ul1KVouSSxzTzPO0b"; protected-headers="v1" From: Demi Marie Obenour To: Alyssa Ross Cc: devel@spectrum-os.org Message-ID: Subject: Re: [PATCH v2] scripts/make-gpt.sh: allow setting partition size References: <20251128132227.243596-2-hi@alyssa.is> <87ms45oo6b.fsf@alyssa.is> <373ef2eb-d230-431a-a22c-1a83348d5075@gmail.com> <87jyz9onmc.fsf@alyssa.is> <08f97c52-d6e4-424a-99dc-f29f37515fcb@gmail.com> In-Reply-To: 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 --------------9nH9mQ5ul1KVouSSxzTzPO0b Content-Type: multipart/mixed; boundary="------------IT5bJoWnVEULlI0uzPExiyKb" --------------IT5bJoWnVEULlI0uzPExiyKb Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 11/28/25 16:35, Alyssa Ross wrote: > On Fri, Nov 28, 2025 at 04:31:21PM -0500, Demi Marie Obenour wrote: >> On 11/28/25 16:26, Alyssa Ross wrote: >>> Demi Marie Obenour writes: >>> >>>> On 11/28/25 16:14, Alyssa Ross wrote: >>>>> Demi Marie Obenour writes: >>>>> >>>>>> On 11/28/25 08:22, Alyssa Ross wrote: >>>>>>> We want non-minimally-sized partitions to leave space for updates= =2E >>>>>>> All such partitions will also be labelled, so we can just add ano= ther >>>>>>> optional field at the end. >>>>>>> >>>>>>> Since we don't parse partition specifications in sh, we can't kee= p a >>>>>>> running total any more, so instead we just go through the table a= t the >>>>>>> end and add up all the sizes, taking advantage of our knowledge t= hat >>>>>>> the size will always be the last thing in each line in our tables= =2E >>>>>>> >>>>>>> Signed-off-by: Alyssa Ross >>>>>>> Message-ID: <20251127174054.2056835-2-hi@alyssa.is> >> >> (snip) >> >>>>>>> # Keep 1MiB free at the start, and 1MiB free at the end. >>>>>>> -gptBytes=3D$((ONE_MiB * 2)) >>>>>>> -for partition; do >>>>>>> - sizeMiB=3D"$(sizeMiB "${partition%%:*}")" >>>>>>> - table=3D"$table${nl}size=3D${sizeMiB}MiB,$(awk -f "$scriptsDir/= sfdisk-field.awk" -v partition=3D"$partition")" >>>>>>> - gptBytes=3D"$((gptBytes + sizeMiB * ONE_MiB))" >>>>>>> -done >>>>>>> +gptMiB=3D2 >>>>>>> +while read -r partition; do >>>>>>> + # Here we rely on sfdisk-field.awk always putting size last. >>>>>>> + : $((gptMiB +=3D ${partition##*=3D})) >>>>>>> +done <>>>>>> +$table >>>>>>> +EOF >>>>>> >>>>>> Nit: should ${partition##*=3D} be in double quotes? >>>>> >>>>> I tried changing it, but it is apparently an "arithmetic syntax err= or" >>>>> to use double quotes here. >>>> >>>> I'd use a separate variable then. >>> >>> Doesn't seem to make a difference. As an experiment: >>> >>> partition=3D"size=3D2 + 3" >>> size=3D${partition##*=3D} >>> printf "%s\n" $(($size)) >>> >>> This prints 5 even though a separate variable is used. It doesn't se= em >>> to be possible to get $(( =E2=80=A6 )) *not* to interpret arithmetic = in >>> variables. >>> >>> In bash, but not busybox ash as used in Nix builds, it is possible to= >>> use double quotes like you suggested, but $(("$size")) is /still/ 5. >> >> That's actually required by POSIX. What about: >> >> size=3D${partition##*=3D} >> : $((gptMiB +=3D size)) >=20 > How's that better? Arithmetic will still be expanded inside size =E2=80= =94 > or do you have some other concern with the parameter expansion inside > the arithmetic expansion? Nevermind. The only way it would be better is if the input was explicitly validated, which might not be worthwile. 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