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helm.go
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helm.go
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package tiltfile
import (
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"regexp"
"runtime"
"strings"
"github.com/ghodss/yaml"
)
// The helm template command outputs predictable yaml with a "Source:" comment,
// so take advantage of that.
const helmSeparator = "---\n"
const helmFileRepository = "file://"
var helmTestYAMLMatcher = regexp.MustCompile("^# Source: .*/tests/")
func filterHelmTestYAML(resourceBlob string) string {
result := []string{}
resources := strings.Split(resourceBlob, helmSeparator)
for _, resource := range resources {
if isHelmTestYAML(resource) {
continue
}
result = append(result, resource)
}
return strings.Join(result, helmSeparator)
}
func isHelmTestYAML(resource string) bool {
lines := strings.Split(resource, "\n")
for _, line := range lines {
if helmTestYAMLMatcher.MatchString(line) {
return true
}
}
return false
}
type helmVersion int
const (
unknownHelmVersion helmVersion = iota
helmV2
helmV3_0
helmV3_1andAbove
)
func parseVersion(versionOutput string) (helmVersion, error) {
// helm v3.3.3 throws warnings on stdout, which messes up version parsing;
// if we have multiple lines of version output, assume version info is in
// the last line (see https://github.com/tilt-dev/tilt/issues/3788)
version := versionOutput
lines := strings.Split(strings.TrimSpace(versionOutput), "\n")
if len(lines) > 1 {
version = lines[(len(lines) - 1)]
}
if strings.HasPrefix(version, "v3.0.") {
return helmV3_0, nil
} else if strings.HasPrefix(version, "v3.") {
return helmV3_1andAbove, nil
} else if strings.HasPrefix(version, "Client: v2") {
return helmV2, nil
}
return unknownHelmVersion, fmt.Errorf("could not parse Helm version from string: %q", versionOutput)
}
func isHelmInstalled() bool {
if runtime.GOOS == "windows" {
cmd := exec.Command("where", "helm.exe")
if err := cmd.Run(); err != nil {
return false
}
return true
}
cmd := exec.Command("/bin/sh", "-c", "command -v helm")
if err := cmd.Run(); err != nil {
return false
}
return true
}
func getHelmVersion() (helmVersion, error) {
if !isHelmInstalled() {
return unknownHelmVersion, unableToFindHelmErrorMessage()
}
// NOTE(dmiller): I pass `--client` here even though that doesn't do anything in Helm v3.
// In Helm v2 that causes `helm version` to not reach out to tiller. Doing so can cause the
// command to fail, even though Tilt doesn't use the server at all (it just calls
// `helm template`).
// In Helm v3, it has no effect, not even an unknown flag error.
cmd := exec.Command("helm", "version", "--client", "--short")
out, err := cmd.Output()
if err != nil {
return unknownHelmVersion, err
}
return parseVersion(string(out))
}
func unableToFindHelmErrorMessage() error {
var binaryName string
if runtime.GOOS == "windows" {
binaryName = "helm.exe"
} else {
binaryName = "helm"
}
return fmt.Errorf("Unable to find Helm installation. Make sure `%s` is on your $PATH.", binaryName)
}
func localSubchartDependenciesFromPath(chartPath string) ([]string, error) {
var deps []string
requirementsPath := filepath.Join(chartPath, "requirements.yaml")
dat, err := ioutil.ReadFile(requirementsPath)
if os.IsNotExist(err) {
return deps, nil
} else if err != nil {
return deps, err
}
return localSubchartDependencies(dat)
}
type chartDependency struct {
Repository string
}
type chartMetadata struct {
Dependencies []chartDependency
}
func localSubchartDependencies(dat []byte) ([]string, error) {
var deps []string
var metadata chartMetadata
err := yaml.Unmarshal(dat, &metadata)
if err != nil {
return deps, err
}
for _, d := range metadata.Dependencies {
if strings.HasPrefix(d.Repository, helmFileRepository) {
deps = append(deps, strings.TrimPrefix(d.Repository, helmFileRepository))
}
}
return deps, nil
}