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dockerapi_compare_versions.go
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dockerapi_compare_versions.go
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// Copyright 2014-2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"). You may
// not use this file except in compliance with the License. A copy of the
// License is located at
//
// http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file is distributed
// on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
// express or implied. See the License for the specific language governing
// permissions and limitations under the License.
package dockerclient
import (
"fmt"
"strconv"
"strings"
)
type DockerAPIVersion string
type dockerVersion struct {
major int
minor int
}
// Matches returns whether or not a version matches a given selector.
// The selector can be any of the following:
//
// * x.y -- Matches a version exactly the same as the selector version
// * >=x.y -- Matches a version greater than or equal to the selector version
// * >x.y -- Matches a version greater than the selector version
// * <=x.y -- Matches a version less than or equal to the selector version
// * <x.y -- Matches a version less than the selector version
// * x.y,a.b -- Matches if the version matches either of the two selector versions
func (lhs DockerAPIVersion) Matches(selector string) (bool, error) {
lhsVersion, err := parseDockerVersions(string(lhs))
if err != nil {
return false, err
}
if strings.Contains(selector, ",") {
orElements := strings.Split(selector, ",")
for _, el := range orElements {
if elMatches, err := lhs.Matches(el); err != nil {
return false, err
} else if elMatches {
return true, nil
}
}
// No elements matched
return false, nil
}
if strings.HasPrefix(selector, ">=") {
rhsVersion, err := parseDockerVersions(selector[2:])
if err != nil {
return false, err
}
return compareDockerVersions(lhsVersion, rhsVersion) >= 0, nil
} else if strings.HasPrefix(selector, ">") {
rhsVersion, err := parseDockerVersions(selector[1:])
if err != nil {
return false, err
}
return compareDockerVersions(lhsVersion, rhsVersion) > 0, nil
} else if strings.HasPrefix(selector, "<=") {
rhsVersion, err := parseDockerVersions(selector[2:])
if err != nil {
return false, err
}
return compareDockerVersions(lhsVersion, rhsVersion) <= 0, nil
} else if strings.HasPrefix(selector, "<") {
rhsVersion, err := parseDockerVersions(selector[1:])
if err != nil {
return false, err
}
return compareDockerVersions(lhsVersion, rhsVersion) < 0, nil
}
rhsVersion, err := parseDockerVersions(selector)
if err != nil {
return false, err
}
return compareDockerVersions(lhsVersion, rhsVersion) == 0, nil
}
func parseDockerVersions(version string) (dockerVersion, error) {
var result dockerVersion
// x.x
versionParts := strings.Split(version, ".")
// [x, x]
if len(versionParts) != 2 {
return result, fmt.Errorf("Not enough '.' characters in the version part")
}
major, err := strconv.Atoi(versionParts[0])
if err != nil {
return result, fmt.Errorf("Cannot parse major version as int: %v", err)
}
minor, err := strconv.Atoi(versionParts[1])
if err != nil {
return result, fmt.Errorf("Cannot parse minor version as int: %v", err)
}
result.major = major
result.minor = minor
return result, nil
}
// compareDockerVersions compares two docker api versions, 'lhs' and 'rhs', and returns -1 if lhs is less
// than rhs, 0 if they are equal, and 1 if lhs is greater than rhs
func compareDockerVersions(lhs, rhs dockerVersion) int {
switch {
case lhs.major < rhs.major:
return -1
case lhs.major > rhs.major:
return 1
case lhs.minor < rhs.minor:
return -1
case lhs.minor > rhs.minor:
return 1
}
return 0
}