+version_get ()
+# based on the command's version output, set variables
+# _MAJOR, _MINOR, _MICRO, _VERSION, using the given prefix as variable prefix
+#
+# arg 1: command binary name
+# arg 2: (uppercased) variable name prefix
+{
+ COMMAND=$1
+ VARPREFIX=`echo $2 | tr .,- _`
+
+ # strip everything that's not a digit, then use cut to get the first field
+ pkg_version=`$COMMAND --version|head -n 1|sed 's/^.*)[^0-9]*//'|cut -d' ' -f1`
+ debug "pkg_version $pkg_version"
+ # remove any non-digit characters from the version numbers to permit numeric
+ # comparison
+ pkg_major=`echo $pkg_version | cut -d. -f1 | sed s/[a-zA-Z\-].*//g`
+ pkg_minor=`echo $pkg_version | cut -d. -f2 | sed s/[a-zA-Z\-].*//g`
+ pkg_micro=`echo $pkg_version | cut -d. -f3 | sed s/[a-zA-Z\-].*//g`
+ test -z "$pkg_major" && pkg_major=0
+ test -z "$pkg_minor" && pkg_minor=0
+ test -z "$pkg_micro" && pkg_micro=0
+ debug "found major $pkg_major minor $pkg_minor micro $pkg_micro"
+ eval ${VARPREFIX}_MAJOR=$pkg_major
+ eval ${VARPREFIX}_MINOR=$pkg_minor
+ eval ${VARPREFIX}_MICRO=$pkg_micro
+ eval ${VARPREFIX}_VERSION=$pkg_version
+}
+
+version_compare ()
+# Checks whether the version of VARPREFIX is equal to or
+# newer than the requested version
+# arg1: VARPREFIX
+# arg2: MAJOR
+# arg3: MINOR
+# arg4: MICRO
+{
+ VARPREFIX=`echo $1 | tr .,- _`
+ MAJOR=$2
+ MINOR=$3
+ MICRO=$4
+
+ eval pkg_major=\$${VARPREFIX}_MAJOR;
+ eval pkg_minor=\$${VARPREFIX}_MINOR;
+ eval pkg_micro=\$${VARPREFIX}_MICRO;
+
+ #start checking the version
+ debug "version_compare: $VARPREFIX against $MAJOR.$MINOR.$MICRO"
+
+ # reset check
+ WRONG=
+
+ if [ ! "$pkg_major" -gt "$MAJOR" ]; then
+ debug "major: $pkg_major <= $MAJOR"
+ if [ "$pkg_major" -lt "$MAJOR" ]; then
+ debug "major: $pkg_major < $MAJOR"
+ WRONG=1
+ elif [ ! "$pkg_minor" -gt "$MINOR" ]; then
+ debug "minor: $pkg_minor <= $MINOR"
+ if [ "$pkg_minor" -lt "$MINOR" ]; then
+ debug "minor: $pkg_minor < $MINOR"
+ WRONG=1
+ elif [ "$pkg_micro" -lt "$MICRO" ]; then
+ debug "micro: $pkg_micro < $MICRO"
+ WRONG=1
+ fi
+ fi
+ fi
+ if test ! -z "$WRONG"; then
+ debug "version_compare: $VARPREFIX older than $MAJOR.$MINOR.$MICRO"
+ return 1
+ fi
+ debug "version_compare: $VARPREFIX equal to/newer than $MAJOR.$MINOR.$MICRO"
+ return 0
+}
+
+