[syncd]: Add socat and bcmsh wrapper (#1657)

* [syncd]: Add socat and bcmsh wrapper
* Install socat in docker-base
* Add hint banner, add host wrapper
* Refine banner message

dockers/docker-base/Dockerfile.j2

@@ -31,6 +31,9 @@ RUN apt-get -y install \
     python             \
     less
 
+# Pre-install troubleshooting packages
+RUN apt-get -y install socat
+
 COPY ["etc/rsyslog.conf", "/etc/rsyslog.conf"]
 COPY ["etc/rsyslog.d/*", "/etc/rsyslog.d/"]
 COPY ["root/.vimrc", "/root/.vimrc"]

platform/broadcom/docker-syncd-brcm/Dockerfile.j2

@@ -19,7 +19,7 @@ debs/{{ deb }}{{' '}}
 ## TODO: add kmod into Depends
 RUN apt-get install -f kmod
 
-COPY ["files/dsserve", "files/bcmcmd", "start.sh", "/usr/bin/"]
+COPY ["files/dsserve", "files/bcmcmd", "start.sh", "bcmsh", "/usr/bin/"]
 RUN chmod +x /usr/bin/dsserve /usr/bin/bcmcmd
 
 COPY ["supervisord.conf", "/etc/supervisor/conf.d/"]

platform/broadcom/docker-syncd-brcm/base_image_files/bcmsh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+docker exec -i syncd bcmsh "$@"

platform/broadcom/docker-syncd-brcm/bcmsh

@@ -0,0 +1,35 @@
+#!/bin/bash
+usage="$(basename "$0") [-h] [-q] -- interactive shell for bcm service
+
+where:
+    -h  show this help text
+    -q  quite, no banner (default: verbose)"
+
+banner="Press Enter to show prompt.
+Press Ctrl+C to exit.
+"
+
+# Default verbose
+quiet=false
+
+while getopts 'hq' option; do
+  case "$option" in
+    h) echo "$usage"
+       exit
+       ;;
+    q) quiet=true
+       ;;
+   \?) printf "illegal option: -%s\n" "$OPTARG" >&2
+       echo "$usage" >&2
+       exit 1
+       ;;
+  esac
+done
+shift $((OPTIND - 1))
+
+if [ "$quiet" = false ]; then
+    echo "$banner"
+fi
+
+/usr/bin/socat - UNIX-CONNECT:/var/run/sswsyncd/sswsyncd.socket
+