net-im/tencent-qq/files/vercmp.sh

   1 #!/usr/bin/env bash
   2
   3 # Comparison expressions for semantic versions.
   4 # only supports semver standard MAJOR.MINOR.PATCH syntax;
   5 # pre-release or build-metadata extensions have undefined behavior.
   6
   7 set -o errexit
   8 set -o pipefail
   9
  10 function usage() {
  11   echo "Comparison expressions for semantic versions."
  12   echo
  13   echo "usage: vercmp VERSION_A OPERATOR VERSION_B"
  14   echo
  15   echo "OPERATORS"
  16   echo
  17   echo "  lt   - Less than"
  18   echo "  lteq - Less than or equal to"
  19   echo "  eq   - Equal to"
  20   echo "  gteq - Grater than or equal to"
  21   echo "  gt   - Greater than"
  22   echo
  23 }
  24
  25 if [ "$#" -ne 3 ]; then
  26   usage
  27   exit 1
  28 fi
  29
  30 LEFT="$1"
  31 OPERATOR="$2"
  32 RIGHT="$3"
  33
  34 if [ "$LEFT" = "$RIGHT" ]; then
  35   COMPARISON=0
  36 else
  37   SORTED=($(for VER in "$LEFT" "$RIGHT"; do echo "$VER"; done | sort -V))
  38   if [ "${SORTED[0]}" = "$LEFT" ]; then
  39     COMPARISON=-1
  40   else
  41     COMPARISON=1
  42   fi
  43 fi
  44
  45 OUTCOME=false
  46
  47 case $OPERATOR in
  48   lt)
  49     if [ "$COMPARISON" -eq -1 ]; then
  50       OUTCOME=true
  51     fi
  52     ;;
  53
  54   lteq)
  55     if [ "$COMPARISON" -lt 1 ]; then
  56       OUTCOME=true
  57     fi
  58     ;;
  59
  60   eq)
  61     if [ "$COMPARISON" -eq 0 ]; then
  62       OUTCOME=true
  63     fi
  64     ;;
  65
  66   gteq)
  67     if [ "$COMPARISON" -gt -1 ]; then
  68       OUTCOME=true
  69     fi
  70     ;;
  71
  72   gt)
  73     if [ "$COMPARISON" -eq 1 ]; then
  74       OUTCOME=true
  75     fi
  76     ;;
  77
  78   *)
  79     usage
  80     exit 1
  81     ;;
  82 esac
  83
  84 VERCMP_QUIET="${VERCMP_QUIET:-false}"
  85 if [ ! "$VERCMP_QUIET" = "true" ]; then
  86   echo "$OUTCOME"
  87 fi
  88
  89 if [ "$OUTCOME" = "true" ]; then
  90   exit 0
  91 else
  92   exit 1
  93 fi