mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 13:00:06 +00:00
309 lines
6.7 KiB
Bash
309 lines
6.7 KiB
Bash
#! @KSH@
|
|
|
|
# '@(#)tzselect.ksh 8.1'
|
|
|
|
# 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 several features of the Korn shell.
|
|
# If your host lacks the Korn shell,
|
|
# you can use either of the following free programs instead:
|
|
#
|
|
# <a href=ftp://ftp.gnu.org/pub/gnu/>
|
|
# Bourne-Again shell (bash)
|
|
# </a>
|
|
#
|
|
# <a href=ftp://ftp.cs.mun.ca/pub/pdksh/pdksh.tar.gz>
|
|
# Public domain ksh
|
|
# </a>
|
|
#
|
|
# 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.2,
|
|
# you can use either of the following free programs instead:
|
|
#
|
|
# <a href=ftp://ftp.gnu.org/pub/gnu/>
|
|
# GNU awk (gawk)
|
|
# </a>
|
|
#
|
|
# <a href=ftp://ftp.whidbey.net/pub/brennan/>
|
|
# mawk
|
|
# </a>
|
|
|
|
|
|
# Specify default values for environment variables if they are unset.
|
|
: ${AWK=awk}
|
|
: ${TZDIR=@TZDIR@}
|
|
|
|
# Check for awk Posix compliance.
|
|
($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
|
|
}
|
|
|
|
# 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"
|