cmd/gomoteserver: add files to build gomote server

This change adds files to build the gomote server. There
is a small fix on a flag description in the actual gomote
server itself.

Updates golang/go#61912
For golang/go#61772

Change-Id: If424342975bf210cd27d8b18879210eac53ea8fb
Reviewed-on: https://go-review.googlesource.com/c/build/+/520239
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
Run-TryBot: Carlos Amedee <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
Auto-Submit: Carlos Amedee <[email protected]>

cmd/gomoteserver/Dockerfile

@@ -0,0 +1,54 @@
+# Copyright 2023 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+FROM golang:1.20-bookworm AS build
+LABEL maintainer="[email protected]"
+
+COPY go.mod /go/src/golang.org/x/build/go.mod
+COPY go.sum /go/src/golang.org/x/build/go.sum
+
+WORKDIR /go/src/golang.org/x/build
+
+# Download module dependencies to improve speed of re-building the
+# Docker image during minor code changes.
+RUN go mod download
+
+# Makefile passes a string with --build-arg version
+# This becomes part of the cache key for all subsequent instructions,
+# so it must not be placed above the "go mod download" command above.
+ARG version=unknown
+
+COPY . /go/src/golang.org/x/build/
+
+RUN go install -ldflags "-X 'main.Version=$version'" golang.org/x/build/cmd/gomoteserver
+
+FROM debian:bookworm AS build_drawterm
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    git-core ca-certificates make gcc libc6-dev libx11-dev
+
+# drawterm connects to plan9 instances like:
+#    echo glenda123 | ./drawterm -a <addr> -c <addr> -u glenda -k user=glenda
+# Where <addr> is the IP address of the Plan 9 instance on GCE,
+# "glenda" is the username and "glenda123" is the password.
+RUN git clone https://github.com/0intro/conterm /tmp/conterm && \
+    cd /tmp/conterm && \
+    CONF=unix make && mv /tmp/conterm/drawterm /usr/local/bin && \
+    rm -rf /tmp/conterm
+
+FROM debian:bookworm
+
+# openssh client is for the gomote ssh proxy client.
+# telnet is for the gomote ssh proxy to windows. (no ssh server there)
+RUN apt-get update && apt-get install -y \
+	--no-install-recommends \
+	ca-certificates \
+	openssh-client \
+	telnet \
+	&& rm -rf /var/lib/apt/lists/*
+
+COPY --from=build /go/bin/gomoteserver /
+COPY --from=build_drawterm /usr/local/bin/drawterm /usr/local/bin/
+
+ENTRYPOINT ["/gomoteserver"]

cmd/gomoteserver/gomoteserver.go

@@ -44,8 +44,8 @@ func main() {
 	if err := secret.InitFlagSupport(context.Background()); err != nil {
 		log.Fatalln(err)
 	}
-	privateKey := secret.Flag(secret.NameGomoteSSHPrivateKey, "SendGrid API key for workflows involving sending email.")
-	publicKey := secret.Flag(secret.NameGomoteSSHPublicKey, "SendGrid API key for workflows involving sending email.")
+	privateKey := secret.Flag(secret.NameGomoteSSHPrivateKey, "Gomote SSH private key.")
+	publicKey := secret.Flag(secret.NameGomoteSSHPublicKey, "Gomote SSH public key.")
 
 	sp := remote.NewSessionPool(context.Background())
 	sshCA := mustRetrieveSSHCertificateAuthority()

cmd/gomoteserver/version.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+# Copyright 2023 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+VERSION=$(git rev-parse HEAD)
+CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
+if ! git diff-index HEAD --quiet || ! git diff-files --quiet; then
+  VERSION=$VERSION-dirty
+  dirty=1
+fi
+if [ -n "$dirty" ] || [ -z "$(git config --get-all "branch.${CURRENT_BRANCH}.remote")" ] || [ -n "$(git rev-list '@{upstream}..HEAD')" ]; then
+  VERSION=$VERSION-$USER-$(git show --quiet --pretty=%cI HEAD | perl -npe 's/[^\dT]//g;$_=substr($_,0,15)')
+fi
+echo "$VERSION"