Helm V3 unable to use a remote chart absolute URL with dashed chart name

[ctison]

I need to deploy fission, which is provided as a tgz from Github releases.
I saw that PR for Helm V2 but when I tried with Helm V3, the following error occurred:

Error: invocation of kubernetes:helm:template returned an error: failed to generate YAML for specified Helm chart: failed to load chart from temp directory: stat /var/folders/3y/2vy52_5n0zb92zyrh8p42zmr0000gn/T/helm420775922/fission: no such file or directory

The resource:

new k8s.helm.v3.Chart('fission', {
  chart: 'https://github.com/fission/fission/releases/download/1.12.0/fission-core-1.12.0.tgz',
  values: {
    routerServiceType: 'ClusterIP',
  },
});

[EronWright]

The issue here is that Pulumi is checking for a folder in the unpacked tar named fission rather than fission-core.
Seems due to a too-restrictive regex:

pulumi-kubernetes/provider/pkg/provider/invoke_helm_template.go

Lines 267 to 290 in 78ab387

	chartName, err := func() (string, error) {
	if registry.IsOCI(c.opts.Chart) {
	u, err := url.Parse(c.opts.Chart)
	if err != nil {
	return "", err
	}
	return filepath.Base(u.Path), nil
	}
	// Check if the chart value is a URL with a defined scheme.
	if _url, err := url.Parse(c.opts.Chart); err == nil && len(_url.Scheme) > 0 {
	// Chart path will be of the form `/name-version.tgz`
	re := regexp.MustCompile(`/(\w+)-(\S+)\.tgz$`)
	matches := re.FindStringSubmatch(_url.Path)
	if len(matches) > 1 {
	return matches[1], nil
	}
	}
	splits := strings.Split(c.opts.Chart, "/")
	if len(splits) == 2 {
	return splits[1], nil
	}
	return c.opts.Chart, nil
	}()

[EronWright]

I've confirmed that the issue is fixed in the upcoming Chart v4. This works as expected:

import * as k8s from "@pulumi/kubernetes";

new k8s.helm.v4.Chart('fission', {
    chart: 'https://github.com/fission/fission/releases/download/1.12.0/fission-core-1.12.0.tgz',
    values: {
      routerServiceType: 'ClusterIP',
    },
  });