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version.go
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version.go
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// Copyright 2020 VMware, Inc.
// SPDX-License-Identifier: Apache-2.0
package yttlibrary
import (
"fmt"
"regexp"
"carvel.dev/ytt/pkg/template/core"
"carvel.dev/ytt/pkg/version"
semver "github.com/hashicorp/go-version"
"github.com/k14s/starlark-go/starlark"
"github.com/k14s/starlark-go/starlarkstruct"
)
const (
SemverRegex string = `^(?P<major>0|[1-9]\d*)\.(?P<minor>0|[1-9]\d*)\.(?P<patch>0|[1-9]\d*)` +
`(?:-(?P<prerelease>(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))` +
`?(?:\+(?P<buildmetadata>[0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$`
)
var (
VersionAPI = starlark.StringDict{
"version": &starlarkstruct.Module{
Name: "version",
Members: starlark.StringDict{
"require_at_least": starlark.NewBuiltin("version.require_at_least", core.ErrWrapper(versionModule{}.RequireAtLeast)),
},
},
}
)
type versionModule struct{}
func (b versionModule) RequireAtLeast(thread *starlark.Thread, f *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
if args.Len() != 1 {
return starlark.None, fmt.Errorf("expected exactly one argument")
}
val, err := core.NewStarlarkValue(args.Index(0)).AsString()
if err != nil {
return starlark.None, err
}
r := regexp.MustCompile(SemverRegex)
if !r.MatchString(val) {
return starlark.None, fmt.Errorf("version string '%s' must be a valid semver", val)
}
userConstraint, err := semver.NewConstraint(">=" + val)
if err != nil {
return starlark.None, err
}
yttVersion, err := semver.NewVersion(version.Version)
if err != nil {
return starlark.None, err
}
satisfied := userConstraint.Check(yttVersion)
if !satisfied {
return starlark.None, fmt.Errorf("ytt version '%s' does not meet the minimum required version '%s'", version.Version, val)
}
return starlark.None, nil
}