remote.Command can't resolve mDNS

[blampe]

What happened?

The provider is built with CGO_ENABLED=0, which forces the pure Go resolver for DNS.

In the majority of cases this resolver should be fine, however there are a subset of domains the Go resolver can't handle.

Steps to reproduce

new remote.Command("test", {connection: {host: "foo.local"}, create: "echo hello"})

Expected Behavior

The "foo.local" mDNS query should not leak to the DNS server.

Actual Behavior

$ GODEBUG=netdns=1 pulumi up
go package net: using cgo DNS resolver
...
Diagnostics:
  pulumi:pulumi:Stack (...):
    error: update failed

    go package net: built with netgo build tag; using Go's DNS resolver

  command:remote:Command (test):
    error: dial tcp: lookup foo.local on 192.168.1.1:53: no such host

Versions used

No response

Additional context

The user can work around this by resolving the mDNS query in their application code and then passing the IP address to Pulumi. A little kludgy, but it works.

Contributing

Vote on this issue by adding a 👍 reaction.
To contribute a fix for this issue, leave a comment (and link to your pull request, if you've opened one already).

[iwahbe]

Hey @blampe. It looks like this issue is upstream of golang/go#12524, and it should be fixed now.

Running your example code now gives:

𝛌 GODEBUG=netdns=1 pulumi up
go package net: using cgo DNS resolver
Previewing update (dev)

View in Browser (Ctrl+O): https://app.pulumi.com/pulumi/ts/dev/previews/822a80a2-a23b-4831-8370-06baa9e182ec

     Type                       Name    Plan       
     pulumi:pulumi:Stack        ts-dev             
 +   └─ command:remote:Command  test    create     


Resources:
    + 1 to create
    1 unchanged

Policy Packs run:
    Name                      Version
    pulumi-internal-policies  6

Do you want to perform this update? yes
Updating (dev)

View in Browser (Ctrl+O): https://app.pulumi.com/pulumi/ts/dev/updates/23

     Type                       Name    Status                  Info
     pulumi:pulumi:Stack        ts-dev  **failed**              1 error; 1 message
 +   └─ command:remote:Command  test    **creating failed**     1 error


Diagnostics:
  pulumi:pulumi:Stack (ts-dev):
    go package net: using cgo DNS resolver

    error: update failed

  command:remote:Command (test):
    error: dial tcp: lookup foo.local: no such host

Resources:
    1 unchanged

Policy Packs run:
    Name                      Version
    pulumi-internal-policies  6

Duration: 1m9s

If you are able to reproduce the bug on pulumi-command >=v0.8.x, please open a new issue.