forked from cockroachdb/cockroach
/
version.go
119 lines (105 loc) · 2.98 KB
/
version.go
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// Copyright 2017 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License 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 roachpb
import (
"fmt"
"strconv"
"strings"
"github.com/pkg/errors"
)
// CanBump computes whether an update from version v to version o is possible.
// The main constraint is that either nothing changes; or the major version is
// bumped by one (and the new minor is zero); or the major version remains
// constant and the minor version is bumped by one. The unstable version may
// change without restrictions.
func (v Version) CanBump(o Version) bool {
if o.Less(v) {
return false
}
if o.Patch != 0 {
// Reminder that we don't use Patch versions at all. It's just a
// placeholder.
return false
}
if o.Major == v.Major {
return o.Minor <= v.Minor+1
}
return o.Major == v.Major+1 && o.Minor == 0
}
// Less compares two Versions.
func (v Version) Less(otherV Version) bool {
if v.Major < otherV.Major {
return true
} else if v.Major > otherV.Major {
return false
}
if v.Minor < otherV.Minor {
return true
} else if v.Minor > otherV.Minor {
return false
}
if v.Patch < otherV.Patch {
return true
} else if v.Patch > otherV.Patch {
return false
}
if v.Unstable < otherV.Unstable {
return true
} else if v.Unstable > otherV.Unstable {
return false
}
return false
}
func (v Version) String() string {
if v.Unstable == 0 {
return fmt.Sprintf("%d.%d", v.Major, v.Minor)
}
return fmt.Sprintf("%d.%d-%d", v.Major, v.Minor, v.Unstable)
}
// ParseVersion parses a Version from a string of the form
// "<major>.<minor>-<unstable>" where the "-<unstable>" is optional. We don't
// use the Patch component, so it is always zero.
func ParseVersion(s string) (Version, error) {
var c Version
dotParts := strings.Split(s, ".")
if len(dotParts) != 2 {
return Version{}, errors.Errorf("invalid version %s", s)
}
parts := append(dotParts[:1], strings.Split(dotParts[1], "-")...)
if len(parts) == 2 {
parts = append(parts, "0")
}
if len(parts) != 3 {
return c, errors.Errorf("invalid version %s", s)
}
ints := make([]int64, len(parts))
for i := range parts {
var err error
if ints[i], err = strconv.ParseInt(parts[i], 10, 32); err != nil {
return c, errors.Errorf("invalid version %s: %s", s, err)
}
}
c.Major = int32(ints[0])
c.Minor = int32(ints[1])
c.Unstable = int32(ints[2])
return c, nil
}
// MustParseVersion calls ParseVersion and panics on error.
func MustParseVersion(s string) Version {
v, err := ParseVersion(s)
if err != nil {
panic(err)
}
return v
}