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#!/bin/sh
# Usage: foreachzone command [args...]
#
# The command is run with eval, so can include embedded shell
# metacharacters such as | and ||. It is run in a sub-shell, so can
# change environment or cd to a different directory without
# complicating later runs of the same command.
#
# It is run repeatedly, with the TZ environment variable set to each
# timezone name in turn, excluding the copies of zoneinfo/ under its
# posix/ and right/ sub-dirs. Symbolic links are included (as long as
# they point to valid zone data).
#
# For example, in the top level of a build tree,
# foreachzone ninja tst_qdate_check
# will run all the QDate tests in every time zone (this may take some
# time).
DIR=/usr/share/zoneinfo
[ -d "$DIR" ] || DIR=/usr/lib/zoneinfo
find $DIR -type d \( -name posix -o -name right \) -prune -o \( -type f -o -type l \) -print \
| while read f
do
# To filter out symlinks in zoneinfo/ itself, uncomment this line:
# echo "$f" | grep -wq 'zoneinfo/.*/' || [ ! -h "$f" ] || continue
# To skip all symlinks, omit the -L here:
file -L "$f" | grep -wq 'timezone data .*, version' || continue
( export TZ=${f#*/zoneinfo/}; eval "$@" )
done
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