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commit c36f64aa6dff13b12a1e03a185e75a50fa9f6a4c
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Author: Hans-Peter Nilsson <hp@axis.com>
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Date: Fri Dec 17 21:38:00 2021 +0100
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timezone: handle truncated timezones from tzcode-2021d and later (BZ #28707)
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When using a timezone file with a truncated starting time,
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generated by the zic in IANA tzcode-2021d a.k.a. tzlib-2021d
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(also in tzlib-2021e; current as of this writing), glibc
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asserts in __tzfile_read (on e.g. tzset() for this file) and
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you may find lines matching "tzfile.c:435: __tzfile_read:
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Assertion `num_types == 1' failed" in your syslog.
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One example of such a file is the tzfile for Asuncion
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generated by tzlib-2021e as follows, using the tzlib-2021e zic:
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"zic -d DEST -r @1546300800 -L /dev/null -b slim
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SOURCE/southamerica". Note that in its type 2 header, it has
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two entries in its "time-types" array (types), but only one
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entry in its "transition types" array (type_idxs).
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This is valid and expected already in the published RFC8536, and
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not even frowned upon: "Local time for timestamps before the
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first transition is specified by the first time type (time type
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0)" ... "every nonzero local time type index SHOULD appear at
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least once in the transition type array". Note the "nonzero ...
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index". Until the 2021d zic, index 0 has been shared by the
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first valid transition but with 2021d it's separate, set apart
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as a placeholder and only "implicitly" indexed. (A draft update
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of the RFC mandates that the entry at index 0 is a placeholder
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in this case, hence can no longer be shared.)
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* time/tzfile.c (__tzfile_read): Don't assert when no transitions
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are found.
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Co-authored-by: Christopher Wong <Christopher.Wong@axis.com>
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diff --git a/time/tzfile.c b/time/tzfile.c
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index 190a777152..8668392ad3 100644
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--- a/time/tzfile.c
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+++ b/time/tzfile.c
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@@ -431,8 +431,8 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
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if (__tzname[0] == NULL)
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{
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/* This should only happen if there are no transition rules.
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- In this case there should be only one single type. */
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- assert (num_types == 1);
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+ In this case there's usually only one single type, unless
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+ e.g. the data file has a truncated time-range. */
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__tzname[0] = __tzstring (zone_names);
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}
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if (__tzname[1] == NULL)
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