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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guix-devel-bounces+larch=yhetil.org@gnu.org Sender: guix-devel-bounces+larch=yhetil.org@gnu.org X-Migadu-Country: US X-Migadu-Flow: FLOW_IN ARC-Seal: i=1; s=key1; d=yhetil.org; t=1675707673; a=rsa-sha256; cv=none; b=DIM92JfjjeyT47y2SKFMiIwEUE1eF9nGPzBLUOEquSWstP9zP+kMSjZ8QIQv3rx6fYGbsw xZKnVsNRIpjS6QBnIoDU45lMNSeFb3mMxK6RR25IQOYqxaZOz+edYv1bVqp3e0bljPEea6 5VZeH6l5AzCRd1FppdjYLvZ669NDpxgFw/SvC9nyrIqlpIrtFyhXszqODQvihmKIgRPItV nbmAwqLQ5v6siz0Kn7tdtd9uGAleAnfDfHJUokB8XkDfRko6+3h93LfhAHz/FJCaxBrKq3 5HUWa1MLxiw+qYi94PUYaCJCO/YUpWu1/6OendrpbT1hY6ZNg33Iitk237H+AA== ARC-Authentication-Results: i=1; aspmx1.migadu.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=b+vabPoR; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (aspmx1.migadu.com: domain of "guix-devel-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-devel-bounces+larch=yhetil.org@gnu.org" ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=yhetil.org; s=key1; t=1675707673; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:list-id:list-help: list-unsubscribe:list-subscribe:list-post:dkim-signature; bh=Q001dV7/rkoaFyqaJlg8Jq1AEHg/fBnYWN36U76d9RQ=; b=O/e8dPhRQ2mudlAPUsiJUZXBCZL77BlAgjFbPY3EHg2jK7tjj/m4d1Q7KJdYuyRZu0fpHn 0gYCXobUjh+u4H+jMsUCdoxjGOPK1e3xaK4Kx12y3XOQsNThzKFNRcGUxi/H2Hu89fU+qb thDRiV5tNbIjG3Wjq68PxBxbSLPeh9F04+kfivlNjRfFHbxIY34x6VYirS4xyaSzoI5Fvn +KW6A0t/WjlBzEiUuQof8WSKYcydZL04UJRg31zUj1taIo03RS1czT68kBcaj8GQgglftD nS1Av1t84g96QY3BMGmlJDSGNMFl6X7i6l3pmgDBelCwB2tbb6tLwF0HeCD9LQ== Authentication-Results: aspmx1.migadu.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=b+vabPoR; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (aspmx1.migadu.com: domain of "guix-devel-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-devel-bounces+larch=yhetil.org@gnu.org" X-Migadu-Scanner: scn1.migadu.com X-Migadu-Spam-Score: -4.78 X-Spam-Score: -4.78 X-Migadu-Queue-Id: 42AACAED2 X-TUID: /zPW3+S79Mzp Hi, On dim., 05 f=C3=A9vr. 2023 at 18:44, bokr@bokr.com wrote: >> From my understanding, we could have something like, >>=20 >> (sha256 (no-hash)) >>=20 >> where =E2=80=99no-hash=E2=80=99 would return a string, say >> "0000000000000000000000000000000000000000000000000000" or whatever else >> that would satisfy this hypothetical =E2=80=99sha256=E2=80=99 sanitizer. > For portability to any hash algorithm that returns a hex string, > how about letting them hash a zero-length string (which can never > represent a package tarball or other archive), and using the > resulting strings as no-hash flags? Instead of =E2=80=9C0000000000000000000000000000000000000000000000000000=E2= =80=9D, you are proposing =E2=80=9C0mdqa9w1p6cmli6976v4wi0sw9r4p5prkj7lzfd1877wk11c9c73= =E2=80=9D which is the Guix hash of empty. > $ sha256sum /dev/null > e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 /dev/nu= ll $ touch foo $ guix hash foo 0mdqa9w1p6cmli6976v4wi0sw9r4p5prkj7lzfd1877wk11c9c73 $ guix hash foo -f hex -H sha256 e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 Yeah, probably better. :-) > These strings must be unique for whatever hash algorithm, > so a short table could be used to recognize them as > no-hash indicators. Well, I do not understand =E2=80=9CThese strings must be unique for whatever hash algorithm=E2=80=9D. What do you mean? Cheers, simon