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Tl;DR: |
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|
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Upstream timezone-data-2020b changed the way /usr/share/zoneinfo |
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files are generated by default. Gentoo does NOT enable this new |
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default to keep existing software running (so far). |
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|
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You can enable new default explicitly with USE=zic-slim switch. |
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|
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Libraries and tools that parse /usr/share/zoneinfo will break in trivial |
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(crashes) or very obscure ways (DST time switch will not happen and |
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will report wrong time). |
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|
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What can you do: |
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|
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If you are feeling brave then enable USE=zic-slim to identify and |
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fix affected packages. Sometimes bugs are specific to a timezone |
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you are in. Running a testsuite is probably the best way to find |
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problems. |
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|
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If you found a bug check that USE=-zic-slim makes it go away and |
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report (and/or fix) it upstream and add it to the gentoo's tracker |
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bug: |
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https://bugs.gentoo.org/749591. |
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|
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What actually changed: |
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|
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From https://data.iana.org/time-zones/tzdb/NEWS: |
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|
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``` |
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Release 2020b - 2020-10-06 18:35:04 -0700 |
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... |
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zic now defaults to '-b slim' instead of to '-b fat'. |
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``` |
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|
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Mechanically both 'fat' and 'slim' are the same VER=2 (or 3 for some |
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timezones) file format from 'man 5 tzfile'. But 'fat'/'slim' contents |
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is different. From 'man 8 zic': |
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|
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``` |
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-b bloat |
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If bloat is fat, generate additional data entries that work |
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around potential bugs or incompatibilities in older software, |
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such as software that mishandles the 64-bit generated data. |
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If bloat is slim, keep the output files small; this can help check |
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for the bugs and incompatibilities. |
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|
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Although the default is currently fat, this is intended to |
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change in future zic versions, as software that mishandles the |
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64-bit data typically mishandles timestamps after the year 2038 |
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anyway. |
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``` |
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|
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Thus ideally libraries should already handle both flavours. But due |
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to bugs some libraries will break. |
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|
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File format spec is an RFC8536: |
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|
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https://www.rfc-editor.org/rfc/rfc8536.txt |
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|
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Good luck! |
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|
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-- |
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|
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Sergei |
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