| 1 | #!/bin/bash
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| 2 |
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| 3 | PKGVERSION="(GNU libc) "
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| 4 | TZVERSION="2.19"
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| 5 | REPORT_BUGS_TO="<http://www.gnu.org/software/libc/bugs.html>"
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| 6 |
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| 7 | # Ask the user about the time zone, and output the resulting TZ value to stdout.
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| 8 | # Interact with the user via stderr and stdin.
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| 9 |
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| 10 | # Contributed by Paul Eggert.
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| 11 |
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| 12 | # Porting notes:
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| 13 | #
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| 14 | # This script requires a Posix-like shell and prefers the extension of a
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| 15 | # 'select' statement. The 'select' statement was introduced in the
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| 16 | # Korn shell and is available in Bash and other shell implementations.
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| 17 | # If your host lacks both Bash and the Korn shell, you can get their
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| 18 | # source from one of these locations:
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| 19 | #
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| 20 | # Bash <http://www.gnu.org/software/bash/bash.html>
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| 21 | # Korn Shell <http://www.kornshell.com/>
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| 22 | # Public Domain Korn Shell <http://www.cs.mun.ca/~michael/pdksh/>
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| 23 | #
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| 24 | # For portability to Solaris 9 /bin/sh this script avoids some POSIX
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| 25 | # features and common extensions, such as $(...) (which works sometimes
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| 26 | # but not others), $((...)), and $10.
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| 27 | #
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| 28 | # This script also uses several features of modern awk programs.
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| 29 | # If your host lacks awk, or has an old awk that does not conform to Posix,
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| 30 | # you can use either of the following free programs instead:
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| 31 | #
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| 32 | # Gawk (GNU awk) <http://www.gnu.org/software/gawk/>
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| 33 | # mawk <http://invisible-island.net/mawk/>
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| 34 |
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| 35 |
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| 36 | # Specify default values for environment variables if they are unset.
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| 37 | : ${AWK=awk}
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| 38 | : ${TZDIR=`pwd`}
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| 39 |
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| 40 | # Check for awk Posix compliance.
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| 41 | ($AWK -v x=y 'BEGIN { exit 123 }') </dev/null >/dev/null 2>&1
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| 42 | [ $? = 123 ] || {
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| 43 | echo >&2 "$0: Sorry, your \`$AWK' program is not Posix compatible."
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| 44 | exit 1
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| 45 | }
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| 46 |
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| 47 | coord=
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| 48 | location_limit=10
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| 49 |
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| 50 | usage="Usage: tzselect [--version] [--help] [-c COORD] [-n LIMIT]
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| 51 | Select a time zone interactively.
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| 52 |
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| 53 | Options:
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| 54 |
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| 55 | -c COORD
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| 56 | Instead of asking for continent and then country and then city,
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| 57 | ask for selection from time zones whose largest cities
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| 58 | are closest to the location with geographical coordinates COORD.
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| 59 | COORD should use ISO 6709 notation, for example, '-c +4852+00220'
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| 60 | for Paris (in degrees and minutes, North and East), or
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| 61 | '-c -35-058' for Buenos Aires (in degrees, South and West).
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| 62 |
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| 63 | -n LIMIT
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| 64 | Display at most LIMIT locations when -c is used (default $location_limit).
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| 65 |
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| 66 | --version
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| 67 | Output version information.
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| 68 |
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| 69 | --help
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| 70 | Output this help.
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| 71 |
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| 72 | Report bugs to $REPORT_BUGS_TO."
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| 73 |
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| 74 | # Ask the user to select from the function's arguments,
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| 75 | # and assign the selected argument to the variable 'select_result'.
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| 76 | # Exit on EOF or I/O error. Use the shell's 'select' builtin if available,
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| 77 | # falling back on a less-nice but portable substitute otherwise.
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| 78 | if
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| 79 | case $BASH_VERSION in
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| 80 | ?*) : ;;
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| 81 | '')
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| 82 | # '; exit' should be redundant, but Dash doesn't properly fail without it.
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| 83 | (eval 'set --; select x; do break; done; exit') 2>/dev/null
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| 84 | esac
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| 85 | then
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| 86 | # Do this inside 'eval', as otherwise the shell might exit when parsing it
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| 87 | # even though it is never executed.
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| 88 | eval '
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| 89 | doselect() {
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| 90 | select select_result
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| 91 | do
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| 92 | case $select_result in
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| 93 | "") echo >&2 "Please enter a number in range." ;;
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| 94 | ?*) break
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| 95 | esac
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| 96 | done || exit
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| 97 | }
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| 98 |
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| 99 | # Work around a bug in bash 1.14.7 and earlier, where $PS3 is sent to stdout.
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| 100 | case $BASH_VERSION in
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| 101 | [01].*)
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| 102 | case `echo 1 | (select x in x; do break; done) 2>/dev/null` in
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| 103 | ?*) PS3=
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| 104 | esac
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| 105 | esac
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| 106 | '
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| 107 | else
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| 108 | doselect() {
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| 109 | # Field width of the prompt numbers.
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| 110 | select_width=`expr $# : '.*'`
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| 111 |
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| 112 | select_i=
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| 113 |
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| 114 | while :
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| 115 | do
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| 116 | case $select_i in
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| 117 | '')
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| 118 | select_i=0
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| 119 | for select_word
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| 120 | do
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| 121 | select_i=`expr $select_i + 1`
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| 122 | printf >&2 "%${select_width}d) %s\\n" $select_i "$select_word"
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| 123 | done ;;
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| 124 | *[!0-9]*)
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| 125 | echo >&2 'Please enter a number in range.' ;;
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| 126 | *)
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| 127 | if test 1 -le $select_i && test $select_i -le $#; then
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| 128 | shift `expr $select_i - 1`
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| 129 | select_result=$1
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| 130 | break
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| 131 | fi
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| 132 | echo >&2 'Please enter a number in range.'
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| 133 | esac
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| 134 |
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| 135 | # Prompt and read input.
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| 136 | printf >&2 %s "${PS3-#? }"
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| 137 | read select_i || exit
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| 138 | done
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| 139 | }
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| 140 | fi
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| 141 |
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| 142 | while getopts c:n:-: opt
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| 143 | do
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| 144 | case $opt$OPTARG in
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| 145 | c*)
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| 146 | coord=$OPTARG ;;
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| 147 | n*)
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| 148 | location_limit=$OPTARG ;;
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| 149 | -help)
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| 150 | exec echo "$usage" ;;
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| 151 | -version)
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| 152 | exec echo "tzselect $PKGVERSION$TZVERSION" ;;
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| 153 | -*)
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| 154 | echo >&2 "$0: -$opt$OPTARG: unknown option; try '$0 --help'"; exit 1 ;;
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| 155 | *)
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| 156 | echo >&2 "$0: try '$0 --help'"; exit 1 ;;
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| 157 | esac
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| 158 | done
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| 159 |
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| 160 | shift `expr $OPTIND - 1`
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| 161 | case $# in
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| 162 | 0) ;;
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| 163 | *) echo >&2 "$0: $1: unknown argument"; exit 1 ;;
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| 164 | esac
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| 165 |
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| 166 | # Make sure the tables are readable.
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| 167 | TZ_COUNTRY_TABLE=$TZDIR/iso3166.tab
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| 168 | TZ_ZONE_TABLE=$TZDIR/zone.tab
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| 169 | for f in $TZ_COUNTRY_TABLE $TZ_ZONE_TABLE
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| 170 | do
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| 171 | <$f || {
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| 172 | echo >&2 "$0: time zone files are not set up correctly"
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| 173 | exit 1
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| 174 | }
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| 175 | done
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| 176 |
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| 177 | newline='
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| 178 | '
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| 179 | IFS=$newline
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| 180 |
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| 181 |
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| 182 | # Awk script to read a time zone table and output the same table,
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| 183 | # with each column preceded by its distance from 'here'.
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| 184 | output_distances='
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| 185 | BEGIN {
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| 186 | FS = "\t"
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| 187 | while (getline <TZ_COUNTRY_TABLE)
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| 188 | if ($0 ~ /^[^#]/)
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| 189 | country[$1] = $2
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| 190 | country["US"] = "US" # Otherwise the strings get too long.
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| 191 | }
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| 192 | function convert_coord(coord, deg, min, ilen, sign, sec) {
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| 193 | if (coord ~ /^[-+]?[0-9]?[0-9][0-9][0-9][0-9][0-9][0-9]([^0-9]|$)/) {
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| 194 | degminsec = coord
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| 195 | intdeg = degminsec < 0 ? -int(-degminsec / 10000) : int(degminsec / 10000)
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| 196 | minsec = degminsec - intdeg * 10000
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| 197 | intmin = minsec < 0 ? -int(-minsec / 100) : int(minsec / 100)
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| 198 | sec = minsec - intmin * 100
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| 199 | deg = (intdeg * 3600 + intmin * 60 + sec) / 3600
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| 200 | } else if (coord ~ /^[-+]?[0-9]?[0-9][0-9][0-9][0-9]([^0-9]|$)/) {
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| 201 | degmin = coord
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| 202 | intdeg = degmin < 0 ? -int(-degmin / 100) : int(degmin / 100)
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| 203 | min = degmin - intdeg * 100
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| 204 | deg = (intdeg * 60 + min) / 60
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| 205 | } else
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| 206 | deg = coord
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| 207 | return deg * 0.017453292519943296
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| 208 | }
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| 209 | function convert_latitude(coord) {
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| 210 | match(coord, /..*[-+]/)
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| 211 | return convert_coord(substr(coord, 1, RLENGTH - 1))
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| 212 | }
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| 213 | function convert_longitude(coord) {
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| 214 | match(coord, /..*[-+]/)
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| 215 | return convert_coord(substr(coord, RLENGTH))
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| 216 | }
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| 217 | # Great-circle distance between points with given latitude and longitude.
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| 218 | # Inputs and output are in radians. This uses the great-circle special
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| 219 | # case of the Vicenty formula for distances on ellipsoids.
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| 220 | function dist(lat1, long1, lat2, long2, dlong, x, y, num, denom) {
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| 221 | dlong = long2 - long1
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| 222 | x = cos (lat2) * sin (dlong)
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| 223 | y = cos (lat1) * sin (lat2) - sin (lat1) * cos (lat2) * cos (dlong)
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| 224 | num = sqrt (x * x + y * y)
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| 225 | denom = sin (lat1) * sin (lat2) + cos (lat1) * cos (lat2) * cos (dlong)
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| 226 | return atan2(num, denom)
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| 227 | }
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| 228 | BEGIN {
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| 229 | coord_lat = convert_latitude(coord)
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| 230 | coord_long = convert_longitude(coord)
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| 231 | }
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| 232 | /^[^#]/ {
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| 233 | here_lat = convert_latitude($2)
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| 234 | here_long = convert_longitude($2)
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| 235 | line = $1 "\t" $2 "\t" $3 "\t" country[$1]
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| 236 | if (NF == 4)
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| 237 | line = line " - " $4
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| 238 | printf "%g\t%s\n", dist(coord_lat, coord_long, here_lat, here_long), line
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| 239 | }
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| 240 | '
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| 241 |
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| 242 | # Begin the main loop. We come back here if the user wants to retry.
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| 243 | while
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| 244 |
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| 245 | echo >&2 'Please identify a location' \
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| 246 | 'so that time zone rules can be set correctly.'
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| 247 |
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| 248 | continent=
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| 249 | country=
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| 250 | region=
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| 251 |
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| 252 | case $coord in
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| 253 | ?*)
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| 254 | continent=coord;;
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| 255 | '')
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| 256 |
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| 257 | # Ask the user for continent or ocean.
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| 258 |
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| 259 | echo >&2 'Please select a continent, ocean, "coord", or "TZ".'
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| 260 |
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| 261 | quoted_continents=`
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| 262 | $AWK '
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| 263 | BEGIN { FS = "\t" }
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| 264 | /^[^#]/ {
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| 265 | entry = substr($3, 1, index($3, "/") - 1)
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| 266 | if (entry == "America")
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| 267 | entry = entry "s"
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| 268 | if (entry ~ /^(Arctic|Atlantic|Indian|Pacific)$/)
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| 269 | entry = entry " Ocean"
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| 270 | printf "'\''%s'\''\n", entry
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| 271 | }
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| 272 | ' $TZ_ZONE_TABLE |
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| 273 | sort -u |
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| 274 | tr '\n' ' '
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| 275 | echo ''
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| 276 | `
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| 277 |
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| 278 | eval '
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| 279 | doselect '"$quoted_continents"' \
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| 280 | "coord - I want to use geographical coordinates." \
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| 281 | "TZ - I want to specify the time zone using the Posix TZ format."
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| 282 | continent=$select_result
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| 283 | case $continent in
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| 284 | Americas) continent=America;;
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| 285 | *" "*) continent=`expr "$continent" : '\''\([^ ]*\)'\''`
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| 286 | esac
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| 287 | '
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| 288 | esac
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| 289 |
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| 290 | case $continent in
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| 291 | TZ)
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| 292 | # Ask the user for a Posix TZ string. Check that it conforms.
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| 293 | while
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| 294 | echo >&2 'Please enter the desired value' \
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| 295 | 'of the TZ environment variable.'
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| 296 | echo >&2 'For example, GST-10 is a zone named GST' \
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| 297 | 'that is 10 hours ahead (east) of UTC.'
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| 298 | read TZ
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| 299 | $AWK -v TZ="$TZ" 'BEGIN {
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| 300 | tzname = "[^-+,0-9][^-+,0-9][^-+,0-9]+"
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| 301 | time = "[0-2]?[0-9](:[0-5][0-9](:[0-5][0-9])?)?"
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| 302 | offset = "[-+]?" time
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| 303 | date = "(J?[0-9]+|M[0-9]+\.[0-9]+\.[0-9]+)"
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| 304 | datetime = "," date "(/" time ")?"
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| 305 | tzpattern = "^(:.*|" tzname offset "(" tzname \
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| 306 | "(" offset ")?(" datetime datetime ")?)?)$"
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| 307 | if (TZ ~ tzpattern) exit 1
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| 308 | exit 0
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| 309 | }'
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| 310 | do
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| 311 | echo >&2 "\`$TZ' is not a conforming" \
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| 312 | 'Posix time zone string.'
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| 313 | done
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| 314 | TZ_for_date=$TZ;;
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| 315 | *)
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| 316 | case $continent in
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| 317 | coord)
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| 318 | case $coord in
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| 319 | '')
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| 320 | echo >&2 'Please enter coordinates' \
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| 321 | 'in ISO 6709 notation.'
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| 322 | echo >&2 'For example, +4042-07403 stands for'
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| 323 | echo >&2 '40 degrees 42 minutes north,' \
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| 324 | '74 degrees 3 minutes west.'
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| 325 | read coord;;
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| 326 | esac
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| 327 | distance_table=`$AWK \
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| 328 | -v coord="$coord" \
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| 329 | -v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \
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| 330 | "$output_distances" <$TZ_ZONE_TABLE |
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| 331 | sort -n |
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| 332 | sed "${location_limit}q"
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| 333 | `
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| 334 | regions=`echo "$distance_table" | $AWK '
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| 335 | BEGIN { FS = "\t" }
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| 336 | { print $NF }
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| 337 | '`
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| 338 | echo >&2 'Please select one of the following' \
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| 339 | 'time zone regions,'
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| 340 | echo >&2 'listed roughly in increasing order' \
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| 341 | "of distance from $coord".
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| 342 | doselect $regions
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| 343 | region=$select_result
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| 344 | TZ=`echo "$distance_table" | $AWK -v region="$region" '
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| 345 | BEGIN { FS="\t" }
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| 346 | $NF == region { print $4 }
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| 347 | '`
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| 348 | ;;
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| 349 | *)
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| 350 | # Get list of names of countries in the continent or ocean.
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| 351 | countries=`$AWK \
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| 352 | -v continent="$continent" \
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| 353 | -v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \
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| 354 | '
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| 355 | BEGIN { FS = "\t" }
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| 356 | /^#/ { next }
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| 357 | $3 ~ ("^" continent "/") {
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| 358 | if (!cc_seen[$1]++) cc_list[++ccs] = $1
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| 359 | }
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| 360 | END {
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| 361 | while (getline <TZ_COUNTRY_TABLE) {
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| 362 | if ($0 !~ /^#/) cc_name[$1] = $2
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| 363 | }
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| 364 | for (i = 1; i <= ccs; i++) {
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| 365 | country = cc_list[i]
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| 366 | if (cc_name[country]) {
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| 367 | country = cc_name[country]
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| 368 | }
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| 369 | print country
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| 370 | }
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| 371 | }
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| 372 | ' <$TZ_ZONE_TABLE | sort -f`
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| 373 |
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| 374 |
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| 375 | # If there's more than one country, ask the user which one.
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| 376 | case $countries in
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| 377 | *"$newline"*)
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| 378 | echo >&2 'Please select a country' \
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| 379 | 'whose clocks agree with yours.'
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| 380 | doselect $countries
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| 381 | country=$select_result;;
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| 382 | *)
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| 383 | country=$countries
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| 384 | esac
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| 385 |
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| 386 |
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| 387 | # Get list of names of time zone rule regions in the country.
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| 388 | regions=`$AWK \
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| 389 | -v country="$country" \
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| 390 | -v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \
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| 391 | '
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| 392 | BEGIN {
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| 393 | FS = "\t"
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| 394 | cc = country
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| 395 | while (getline <TZ_COUNTRY_TABLE) {
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| 396 | if ($0 !~ /^#/ && country == $2) {
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| 397 | cc = $1
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| 398 | break
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| 399 | }
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| 400 | }
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| 401 | }
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| 402 | $1 == cc { print $4 }
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| 403 | ' <$TZ_ZONE_TABLE`
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| 404 |
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| 405 |
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| 406 | # If there's more than one region, ask the user which one.
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| 407 | case $regions in
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| 408 | *"$newline"*)
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| 409 | echo >&2 'Please select one of the following' \
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| 410 | 'time zone regions.'
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| 411 | doselect $regions
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| 412 | region=$select_result;;
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| 413 | *)
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| 414 | region=$regions
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| 415 | esac
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| 416 |
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| 417 | # Determine TZ from country and region.
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| 418 | TZ=`$AWK \
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| 419 | -v country="$country" \
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| 420 | -v region="$region" \
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| 421 | -v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \
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| 422 | '
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| 423 | BEGIN {
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| 424 | FS = "\t"
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| 425 | cc = country
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| 426 | while (getline <TZ_COUNTRY_TABLE) {
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| 427 | if ($0 !~ /^#/ && country == $2) {
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| 428 | cc = $1
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| 429 | break
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| 430 | }
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| 431 | }
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| 432 | }
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| 433 | $1 == cc && $4 == region { print $3 }
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| 434 | ' <$TZ_ZONE_TABLE`
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| 435 | esac
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| 436 |
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| 437 | # Make sure the corresponding zoneinfo file exists.
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| 438 | TZ_for_date=$TZDIR/$TZ
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| 439 | <$TZ_for_date || {
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| 440 | echo >&2 "$0: time zone files are not set up correctly"
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| 441 | exit 1
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| 442 | }
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| 443 | esac
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| 444 |
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| 445 |
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| 446 | # Use the proposed TZ to output the current date relative to UTC.
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| 447 | # Loop until they agree in seconds.
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| 448 | # Give up after 8 unsuccessful tries.
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| 449 |
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| 450 | extra_info=
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| 451 | for i in 1 2 3 4 5 6 7 8
|
|---|
| 452 | do
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| 453 | TZdate=`LANG=C TZ="$TZ_for_date" date`
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| 454 | UTdate=`LANG=C TZ=UTC0 date`
|
|---|
| 455 | TZsec=`expr "$TZdate" : '.*:\([0-5][0-9]\)'`
|
|---|
| 456 | UTsec=`expr "$UTdate" : '.*:\([0-5][0-9]\)'`
|
|---|
| 457 | case $TZsec in
|
|---|
| 458 | $UTsec)
|
|---|
| 459 | extra_info="
|
|---|
| 460 | Local time is now: $TZdate.
|
|---|
| 461 | Universal Time is now: $UTdate."
|
|---|
| 462 | break
|
|---|
| 463 | esac
|
|---|
| 464 | done
|
|---|
| 465 |
|
|---|
| 466 |
|
|---|
| 467 | # Output TZ info and ask the user to confirm.
|
|---|
| 468 |
|
|---|
| 469 | echo >&2 ""
|
|---|
| 470 | echo >&2 "The following information has been given:"
|
|---|
| 471 | echo >&2 ""
|
|---|
| 472 | case $country%$region%$coord in
|
|---|
| 473 | ?*%?*%) echo >&2 " $country$newline $region";;
|
|---|
| 474 | ?*%%) echo >&2 " $country";;
|
|---|
| 475 | %?*%?*) echo >&2 " coord $coord$newline $region";;
|
|---|
| 476 | %%?*) echo >&2 " coord $coord";;
|
|---|
| 477 | +) echo >&2 " TZ='$TZ'"
|
|---|
| 478 | esac
|
|---|
| 479 | echo >&2 ""
|
|---|
| 480 | echo >&2 "Therefore TZ='$TZ' will be used.$extra_info"
|
|---|
| 481 | echo >&2 "Is the above information OK?"
|
|---|
| 482 |
|
|---|
| 483 | doselect Yes No
|
|---|
| 484 | ok=$select_result
|
|---|
| 485 | case $ok in
|
|---|
| 486 | Yes) break
|
|---|
| 487 | esac
|
|---|
| 488 | do coord=
|
|---|
| 489 | done
|
|---|
| 490 |
|
|---|
| 491 | case $SHELL in
|
|---|
| 492 | *csh) file=.login line="setenv TZ '$TZ'";;
|
|---|
| 493 | *) file=.profile line="TZ='$TZ'; export TZ"
|
|---|
| 494 | esac
|
|---|
| 495 |
|
|---|
| 496 | echo >&2 "
|
|---|
| 497 | You can make this change permanent for yourself by appending the line
|
|---|
| 498 | $line
|
|---|
| 499 | to the file '$file' in your home directory; then log out and log in again.
|
|---|
| 500 |
|
|---|
| 501 | Here is that TZ value again, this time on standard output so that you
|
|---|
| 502 | can use the $0 command in shell scripts:"
|
|---|
| 503 |
|
|---|
| 504 | echo "$TZ"
|
|---|
