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hack/make/.binary: don't use "netgo" when building Windows binaries

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Starting with go1.19, the Go runtime on Windows now supports the `netgo` build-
flag to use a native Go DNS resolver. Prior to that version, the build-flag
only had an effect on non-Windows platforms. When using the `netgo` build-flag,
the Windows's host resolver is not used, and as a result, custom entries in
`etc/hosts` are ignored, which is a change in behavior from binaries compiled
with older versions of the Go runtime.

From the go1.19 release notes: https://go.dev/doc/go1.19#net

> Resolver.PreferGo is now implemented on Windows and Plan 9. It previously
> only worked on Unix platforms. Combined with Dialer.Resolver and Resolver.Dial,
> it's now possible to write portable programs and be in control of all DNS name
> lookups when dialing.
>
> The net package now has initial support for the netgo build tag on Windows.
> When used, the package uses the Go DNS client (as used by Resolver.PreferGo)
> instead of asking Windows for DNS results. The upstream DNS server it discovers
> from Windows may not yet be correct with complex system network configurations,
> however.

Our Windows binaries are compiled with the "static" (`make/binary-daemon`)
script, which has the `netgo` option set by default. This patch unsets the
`netgo` option when cross-compiling for Windows.

Co-authored-by: Bjorn Neergaard <bjorn.neergaard@docker.com>
Signed-off-by: Bjorn Neergaard <bjorn.neergaard@docker.com>
(cherry picked from commit 53d1b12bc0)
Signed-off-by: Bjorn Neergaard <bjorn.neergaard@docker.com>
This commit is contained in:
Sebastiaan van Stijn 2023-05-24 08:51:05 -06:00 • committed by Bjorn Neergaard
parent 0f8ffc4b89
commit 3d5ebbecda
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hack/make/.binary
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@ -82,6 +82,18 @@ hash_files() {
esac
fi
# XXX: Disable netgo on Windows and use Window's system resolver instead.
#
# go1.19 and newer added support for netgo on Windows (https://go.dev/doc/go1.19#net),
# which won't ask Windows for DNS results, and hence may be ignoring
# custom "C:\Windows\System32\drivers\etc\hosts".
# See https://github.com/moby/moby/issues/45251#issuecomment-1561001817
# https://github.com/moby/moby/issues/45251, and
# https://go-review.googlesource.com/c/go/+/467335
if [ "$(go env GOOS)" = "windows" ]; then
BUILDFLAGS=("${BUILDFLAGS[@]/netgo/}")
fi
echo "Building: $DEST/$BINARY_FULLNAME"
echo "GOOS=\"${GOOS}\" GOARCH=\"${GOARCH}\" GOARM=\"${GOARM}\""
go build \