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glibc/timezone/tzselect.ksh
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#!/bin/bash | |
PKGVERSION='(tzcode) ' | |
TZVERSION=see_Makefile | |
REPORT_BUGS_TO=tz@iana.org | |
# Ask the user about the time zone, and output the resulting TZ value to stdout. | |
# Interact with the user via stderr and stdin. | |
# Contributed by Paul Eggert. | |
# Porting notes: | |
# | |
# This script requires a Posix-like shell with the extension of a | |
# 'select' statement. The 'select' statement was introduced in the | |
# Korn shell and is available in Bash and other shell implementations. | |
# If your host lacks both Bash and the Korn shell, you can get their | |
# source from one of these locations: | |
# | |
# Bash <http://www.gnu.org/software/bash/bash.html> | |
# Korn Shell <http://www.kornshell.com/> | |
# Public Domain Korn Shell <http://www.cs.mun.ca/~michael/pdksh/> | |
# | |
# This script also uses several features of modern awk programs. | |
# If your host lacks awk, or has an old awk that does not conform to Posix, | |
# you can use either of the following free programs instead: | |
# | |
# Gawk (GNU awk) <http://www.gnu.org/software/gawk/> | |
# mawk <http://invisible-island.net/mawk/> | |
# Specify default values for environment variables if they are unset. | |
: ${AWK=awk} | |
: ${TZDIR=$(pwd)} | |
# Check for awk Posix compliance. | |
($AWK -v x=y 'BEGIN { exit 123 }') </dev/null >/dev/null 2>&1 | |
[ $? = 123 ] || { | |
echo >&2 "$0: Sorry, your \`$AWK' program is not Posix compatible." | |
exit 1 | |
} | |
if [ "$1" = "--help" ]; then | |
cat <<EOF | |
Usage: tzselect | |
Select a time zone interactively. | |
Report bugs to $REPORT_BUGS_TO. | |
EOF | |
exit | |
elif [ "$1" = "--version" ]; then | |
cat <<EOF | |
tzselect $PKGVERSION$TZVERSION | |
EOF | |
exit | |
fi | |
# Make sure the tables are readable. | |
TZ_COUNTRY_TABLE=$TZDIR/iso3166.tab | |
TZ_ZONE_TABLE=$TZDIR/zone.tab | |
for f in $TZ_COUNTRY_TABLE $TZ_ZONE_TABLE | |
do | |
<$f || { | |
echo >&2 "$0: time zone files are not set up correctly" | |
exit 1 | |
} | |
done | |
newline=' | |
' | |
IFS=$newline | |
# Work around a bug in bash 1.14.7 and earlier, where $PS3 is sent to stdout. | |
case $(echo 1 | (select x in x; do break; done) 2>/dev/null) in | |
?*) PS3= | |
esac | |
# Begin the main loop. We come back here if the user wants to retry. | |
while | |
echo >&2 'Please identify a location' \ | |
'so that time zone rules can be set correctly.' | |
continent= | |
country= | |
region= | |
# Ask the user for continent or ocean. | |
echo >&2 'Please select a continent or ocean.' | |
select continent in \ | |
Africa \ | |
Americas \ | |
Antarctica \ | |
'Arctic Ocean' \ | |
Asia \ | |
'Atlantic Ocean' \ | |
Australia \ | |
Europe \ | |
'Indian Ocean' \ | |
'Pacific Ocean' \ | |
'none - I want to specify the time zone using the Posix TZ format.' | |
do | |
case $continent in | |
'') | |
echo >&2 'Please enter a number in range.';; | |
?*) | |
case $continent in | |
Americas) continent=America;; | |
*' '*) continent=$(expr "$continent" : '\([^ ]*\)') | |
esac | |
break | |
esac | |
done | |
case $continent in | |
'') | |
exit 1;; | |
none) | |
# Ask the user for a Posix TZ string. Check that it conforms. | |
while | |
echo >&2 'Please enter the desired value' \ | |
'of the TZ environment variable.' | |
echo >&2 'For example, GST-10 is a zone named GST' \ | |
'that is 10 hours ahead (east) of UTC.' | |
read TZ | |
$AWK -v TZ="$TZ" 'BEGIN { | |
tzname = "[^-+,0-9][^-+,0-9][^-+,0-9]+" | |
time = "[0-2]?[0-9](:[0-5][0-9](:[0-5][0-9])?)?" | |
offset = "[-+]?" time | |
date = "(J?[0-9]+|M[0-9]+\.[0-9]+\.[0-9]+)" | |
datetime = "," date "(/" time ")?" | |
tzpattern = "^(:.*|" tzname offset "(" tzname \ | |
"(" offset ")?(" datetime datetime ")?)?)$" | |
if (TZ ~ tzpattern) exit 1 | |
exit 0 | |
}' | |
do | |
echo >&2 "\`$TZ' is not a conforming" \ | |
'Posix time zone string.' | |
done | |
TZ_for_date=$TZ;; | |
*) | |
# Get list of names of countries in the continent or ocean. | |
countries=$($AWK -F'\t' \ | |
-v continent="$continent" \ | |
-v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \ | |
' | |
/^#/ { next } | |
$3 ~ ("^" continent "/") { | |
if (!cc_seen[$1]++) cc_list[++ccs] = $1 | |
} | |
END { | |
while (getline <TZ_COUNTRY_TABLE) { | |
if ($0 !~ /^#/) cc_name[$1] = $2 | |
} | |
for (i = 1; i <= ccs; i++) { | |
country = cc_list[i] | |
if (cc_name[country]) { | |
country = cc_name[country] | |
} | |
print country | |
} | |
} | |
' <$TZ_ZONE_TABLE | sort -f) | |
# If there's more than one country, ask the user which one. | |
case $countries in | |
*"$newline"*) | |
echo >&2 'Please select a country.' | |
select country in $countries | |
do | |
case $country in | |
'') echo >&2 'Please enter a number in range.';; | |
?*) break | |
esac | |
done | |
case $country in | |
'') exit 1 | |
esac;; | |
*) | |
country=$countries | |
esac | |
# Get list of names of time zone rule regions in the country. | |
regions=$($AWK -F'\t' \ | |
-v country="$country" \ | |
-v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \ | |
' | |
BEGIN { | |
cc = country | |
while (getline <TZ_COUNTRY_TABLE) { | |
if ($0 !~ /^#/ && country == $2) { | |
cc = $1 | |
break | |
} | |
} | |
} | |
$1 == cc { print $4 } | |
' <$TZ_ZONE_TABLE) | |
# If there's more than one region, ask the user which one. | |
case $regions in | |
*"$newline"*) | |
echo >&2 'Please select one of the following' \ | |
'time zone regions.' | |
select region in $regions | |
do | |
case $region in | |
'') echo >&2 'Please enter a number in range.';; | |
?*) break | |
esac | |
done | |
case $region in | |
'') exit 1 | |
esac;; | |
*) | |
region=$regions | |
esac | |
# Determine TZ from country and region. | |
TZ=$($AWK -F'\t' \ | |
-v country="$country" \ | |
-v region="$region" \ | |
-v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \ | |
' | |
BEGIN { | |
cc = country | |
while (getline <TZ_COUNTRY_TABLE) { | |
if ($0 !~ /^#/ && country == $2) { | |
cc = $1 | |
break | |
} | |
} | |
} | |
$1 == cc && $4 == region { print $3 } | |
' <$TZ_ZONE_TABLE) | |
# Make sure the corresponding zoneinfo file exists. | |
TZ_for_date=$TZDIR/$TZ | |
<$TZ_for_date || { | |
echo >&2 "$0: time zone files are not set up correctly" | |
exit 1 | |
} | |
esac | |
# Use the proposed TZ to output the current date relative to UTC. | |
# Loop until they agree in seconds. | |
# Give up after 8 unsuccessful tries. | |
extra_info= | |
for i in 1 2 3 4 5 6 7 8 | |
do | |
TZdate=$(LANG=C TZ="$TZ_for_date" date) | |
UTdate=$(LANG=C TZ=UTC0 date) | |
TZsec=$(expr "$TZdate" : '.*:\([0-5][0-9]\)') | |
UTsec=$(expr "$UTdate" : '.*:\([0-5][0-9]\)') | |
case $TZsec in | |
$UTsec) | |
extra_info=" | |
Local time is now: $TZdate. | |
Universal Time is now: $UTdate." | |
break | |
esac | |
done | |
# Output TZ info and ask the user to confirm. | |
echo >&2 "" | |
echo >&2 "The following information has been given:" | |
echo >&2 "" | |
case $country+$region in | |
?*+?*) echo >&2 " $country$newline $region";; | |
?*+) echo >&2 " $country";; | |
+) echo >&2 " TZ='$TZ'" | |
esac | |
echo >&2 "" | |
echo >&2 "Therefore TZ='$TZ' will be used.$extra_info" | |
echo >&2 "Is the above information OK?" | |
ok= | |
select ok in Yes No | |
do | |
case $ok in | |
'') echo >&2 'Please enter 1 for Yes, or 2 for No.';; | |
?*) break | |
esac | |
done | |
case $ok in | |
'') exit 1;; | |
Yes) break | |
esac | |
do : | |
done | |
case $SHELL in | |
*csh) file=.login line="setenv TZ '$TZ'";; | |
*) file=.profile line="TZ='$TZ'; export TZ" | |
esac | |
echo >&2 " | |
You can make this change permanent for yourself by appending the line | |
$line | |
to the file '$file' in your home directory; then log out and log in again. | |
Here is that TZ value again, this time on standard output so that you | |
can use the $0 command in shell scripts:" | |
echo "$TZ" |