Add helper programs for console support

recvtty is needed to trick runc into thinking it has a console and
doesn't err out and serial_fd_handler passes off the tty fd to
containerd.  Both support being cross compiled.

Signed-off-by: Brian Woods <brian.woods@xilinx.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

build.sh

@@ -17,7 +17,7 @@
 set -e
 set -o pipefail
 
-execs="start delete"
+execs="start delete serial_bridge serial_start"
 
 # Clean the repo, but save the vendor area
 if [ "x${1:-}" != "x" ] && [ "clean" == "$1" ]; then
@@ -53,6 +53,17 @@ for i in $execs; do
     cp files/$i target/usr/share/runX
 done
 
+cd gobuild
+if [[ $ARCH = "x86" ]]
+then
+    make GOARCH=amd64
+else
+    make GOARCH=$ARCH
+fi
+cd -
+cp gobuild/serial_fd_handler target/usr/share/runX/
+cp gobuild/recvtty target/usr/share/runX/
+
 mkdir -p target/usr/sbin
 cp runX target/usr/sbin
 

gobuild/Makefile

@@ -0,0 +1,31 @@
+GOPATH=$(shell pwd)/go
+GOSRC=${GOPATH}/src
+GODEPS=github.com/opencontainers/runc
+GODEPPATHS=$(addprefix ${GOSRC}/,${GODEPS})
+MAIN=src/serial_fd_handler.go go/src/github.com/opencontainers/runc/contrib/cmd/recvtty/recvtty.go
+BIN=$(basename $(notdir ${MAIN}))
+
+ifdef GOARCH
+ARCH=GOARCH=${GOARCH}
+else
+ARCH=
+endif
+
+.PHONY: clean all dep
+
+all: ${BIN}
+
+dep: ${GODEPPATHS}
+
+${GODEPPATHS}:
+	mkdir -p ${GOSRC}
+	GOPATH=${GOPATH} go get $(subst ${GOSRC}/,,$@)
+
+${BIN}: ${GODEPPATHS} $(filter %/$@.go, ${MAIN})
+	GOPATH=${GOPATH} ${ARCH} go build $(filter %/$@.go, ${MAIN})
+
+clean:
+	rm -f   ${BIN}
+
+distclean:
+	rm -rf ${BIN} ${GOPATH}

gobuild/src/serial_fd_handler.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"fmt"
+	"time"
+	"net"
+	"os"
+	"github.com/opencontainers/runc/libcontainer/utils"
+)
+
+func main() {
+
+	//socket_file, err := os.Open(os.Args[1])
+	socket_conn, err := net.Dial("unix", os.Args[1])
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+
+	socket_fd, ok := socket_conn.(*net.UnixConn)
+	if !ok {
+		fmt.Errorf("failed to cast to fd")
+		os.Exit(1)
+	}
+
+	socket_file, err := socket_fd.File()
+	if err != nil {
+		fmt.Errorf("failed to cast to file")
+		os.Exit(1)
+	}
+
+	xen_file, err := os.OpenFile(os.Args[2], os.O_RDWR, 0755)
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	xen_fd := xen_file.Fd()
+
+	//need FD? Name?
+
+	err = utils.SendFd(socket_file, os.Args[2], xen_fd);
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+
+	//give containerd enough to get the info and then exit
+	time.Sleep(20 * time.Second)
+
+	return
+}