From: Mateusz Poliwczak <mpoliwczak34@gmail.com>
Date: Thu, 11 May 2023 07:57:33 +0000 (+0000)
Subject: net: return fallbackOrder immediately for some GOOS
X-Git-Tag: go1.21rc1~571
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=1b630b5b0086d3d272eb1d613d7b817a85fbd7f9;p=gostls13.git

net: return fallbackOrder immediately for some GOOS

We don't need to check resolv.conf, nsswitch.conf on these systems.
Seems like this was the behaviour before CL 487196.

Change-Id: I34ef3510891c572772a222fbbe47693aa6c7cf38
GitHub-Last-Rev: 3aace0e6615b79bbf379e05ca3a353e194dc7c0b
GitHub-Pull-Request: golang/go#59946
Reviewed-on: https://go-review.googlesource.com/c/go/+/491995
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Mateusz Poliwczak <mpoliwczak34@gmail.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
---

diff --git a/src/net/conf.go b/src/net/conf.go
index 10bc8c366e..cec996f7f0 100644
--- a/src/net/conf.go
+++ b/src/net/conf.go
@@ -253,6 +253,12 @@ func (c *conf) lookupOrder(r *Resolver, hostname string) (ret hostLookupOrder, d
 		canUseCgo = true
 	}
 
+	// On systems that don't use /etc/resolv.conf or /etc/nsswitch.conf, we are done.
+	switch c.goos {
+	case "windows", "plan9", "android", "ios":
+		return fallbackOrder, nil
+	}
+
 	// Try to figure out the order to use for searches.
 	// If we don't recognize something, use fallbackOrder.
 	// That will use cgo unless the Go resolver was explicitly requested.