Artifact 8ae7041c2cf6a2a1251810dbf8a7dc6332f4f559c2e8048a5689459fc40bc830:
zit now imports sqlite at defaults: 36,416 commits, 2,109 refs, 44m35s, no flags. Two independent walls stood in front of that.
Refs (issue 21). One file per ref made a ref's name a path, so the filesystem got a vote on which repositories are representable. sqlite has refs/remotes/origin/EQP-improvements and .../eqp-improvements at different commits -- legal, distinct git refs -- and on APFS the second landed on the first as a bare PathAlreadyExists, raised during publication after the whole import had run. Case was only the reachable instance; path length, reserved device names and each platform's own Unicode fold table are the same bug in other clothes.
They are one sorted file now, "refs", whose lines pair a canonical name with its target. Nothing reads it back -- "refs" is a reserved root the working-tree scan skips, and branches resolve through repostate's sym- tags -- so it is interop output and its job is to be legible. Sorting makes it byte-identical for a given ref set, so two imports of one repository can be compared.
This supersedes the ASCII-fold refusal from the previous commit. That was the right interim while a ref was a filename; with one file the collision is representable, so refusing it would be gratuitous. What survives is the genuine collision -- distinct sources normalizing to a byte-identical canonical name, refs/heads/./release against refs/heads/release -- which no layout can hold, and which now names both sources instead of only failing.
Budget (issue 20). The 4 GiB payload default refused sqlite's 12.2 GiB stream, and could not simply be raised: fileCommandCeiling divided the same number, so a larger allowance for a whole history was also a larger allowance for one commit's retained command list. Those bound different things and only one is memory -- payload streams and is released per event (sqlite's import held 21 MiB), while a commit's command list is held whole. The arena has max_command_arena_bytes of its own now and keeps the old 4 GiB; the cumulative total goes to 1 TiB.
The file-command ceiling is therefore structural: about 104 million commands in one commit, and no flag raises it. Its diagnostic says so rather than pointing at a knob that no longer moves it. The help text claimed the payload flag fixed both; it only ever fixed one. by dmestas on 2026-07-31 20:55:36.
C import-git:\spack\sthe\srefs,\sand\ssplit\sthe\sbudget\sthey\sshared\swith\spayload\n\nzit\snow\simports\ssqlite\sat\sdefaults:\s36,416\scommits,\s2,109\srefs,\s44m35s,\nno\sflags.\sTwo\sindependent\swalls\sstood\sin\sfront\sof\sthat.\n\nRefs\s(issue\s21).\sOne\sfile\sper\sref\smade\sa\sref's\sname\sa\spath,\sso\sthe\nfilesystem\sgot\sa\svote\son\swhich\srepositories\sare\srepresentable.\ssqlite\nhas\srefs/remotes/origin/EQP-improvements\sand\s.../eqp-improvements\sat\ndifferent\scommits\s--\slegal,\sdistinct\sgit\srefs\s--\sand\son\sAPFS\sthe\ssecond\nlanded\son\sthe\sfirst\sas\sa\sbare\sPathAlreadyExists,\sraised\sduring\npublication\safter\sthe\swhole\simport\shad\srun.\sCase\swas\sonly\sthe\sreachable\ninstance;\spath\slength,\sreserved\sdevice\snames\sand\seach\splatform's\sown\nUnicode\sfold\stable\sare\sthe\ssame\sbug\sin\sother\sclothes.\n\nThey\sare\sone\ssorted\sfile\snow,\s"refs",\swhose\slines\spair\sa\scanonical\sname\nwith\sits\starget.\sNothing\sreads\sit\sback\s--\s"refs"\sis\sa\sreserved\sroot\sthe\nworking-tree\sscan\sskips,\sand\sbranches\sresolve\sthrough\srepostate's\ssym-\ntags\s--\sso\sit\sis\sinterop\soutput\sand\sits\sjob\sis\sto\sbe\slegible.\sSorting\nmakes\sit\sbyte-identical\sfor\sa\sgiven\sref\sset,\sso\stwo\simports\sof\sone\nrepository\scan\sbe\scompared.\n\nThis\ssupersedes\sthe\sASCII-fold\srefusal\sfrom\sthe\sprevious\scommit.\sThat\nwas\sthe\sright\sinterim\swhile\sa\sref\swas\sa\sfilename;\swith\sone\sfile\sthe\ncollision\sis\srepresentable,\sso\srefusing\sit\swould\sbe\sgratuitous.\sWhat\nsurvives\sis\sthe\sgenuine\scollision\s--\sdistinct\ssources\snormalizing\sto\sa\nbyte-identical\scanonical\sname,\srefs/heads/./release\sagainst\nrefs/heads/release\s--\swhich\sno\slayout\scan\shold,\sand\swhich\snow\snames\sboth\nsources\sinstead\sof\sonly\sfailing.\n\nBudget\s(issue\s20).\sThe\s4\sGiB\spayload\sdefault\srefused\ssqlite's\s12.2\sGiB\nstream,\sand\scould\snot\ssimply\sbe\sraised:\sfileCommandCeiling\sdivided\sthe\nsame\snumber,\sso\sa\slarger\sallowance\sfor\sa\swhole\shistory\swas\salso\sa\slarger\nallowance\sfor\sone\scommit's\sretained\scommand\slist.\sThose\sbound\sdifferent\nthings\sand\sonly\sone\sis\smemory\s--\spayload\sstreams\sand\sis\sreleased\sper\nevent\s(sqlite's\simport\sheld\s21\sMiB),\swhile\sa\scommit's\scommand\slist\sis\nheld\swhole.\sThe\sarena\shas\smax_command_arena_bytes\sof\sits\sown\snow\sand\nkeeps\sthe\sold\s4\sGiB;\sthe\scumulative\stotal\sgoes\sto\s1\sTiB.\n\nThe\sfile-command\sceiling\sis\stherefore\sstructural:\sabout\s104\smillion\ncommands\sin\sone\scommit,\sand\sno\sflag\sraises\sit.\sIts\sdiagnostic\ssays\sso\nrather\sthan\spointing\sat\sa\sknob\sthat\sno\slonger\smoves\sit.\sThe\shelp\stext\nclaimed\sthe\spayload\sflag\sfixed\sboth;\sit\sonly\sever\sfixed\sone.\n 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