From fd418edd90256acc2af9d7ea5397c112cd7f45d8 Mon Sep 17 00:00:00 2001
From: Ralph Ronnquist <ralph.ronnquist@gmail.com>
Date: Mon, 14 Mar 2022 00:36:31 +0100
Subject: [PATCH] admin utility

---
 go | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100755 go

diff --git a/go b/go
new file mode 100755
index 0000000..9a0ef24
--- /dev/null
+++ b/go
@@ -0,0 +1,46 @@
+#!/bin/bash
+
+# list of nodes
+nodes() {
+    ssh nash gnt-node list --no-header -oname | sed 's|\..*||'
+}
+
+# filter the unshare command line into "pid name"
+filter_unshare() {
+    sed -e 's|\([0-9]*\).*chroot \([^ ]*\).*|\1\2|' \
+	-e 's|\(.*/\([^/]*\)/[^/ ]*$\)|\2'@$1':\1|'
+}
+
+# enlist all subhosts on all nodes in format: $name@$node:$pid$path
+subhosts() {
+    for NODE in $(nodes) ; do
+	ssh $NODE pgrep -a unshare | filter_unshare $NODE
+    done
+}
+
+ALLSUBS="$(subhosts|sort)"
+[ -z "$1" ] || SUB="$(echo "$ALLSUBS" | grep -E "^$1@")"
+
+if [ -z "$SUB" ] ; then
+    SEL=( $(echo "$ALLSUBS" | sed 's|@.*||') )
+    select SUB in ${SEL[*]} ; do
+	[ -z "$SUB" ] && continue
+	SUB="$(echo "$ALLSUBS" | grep -E "^$SUB@")"
+	break
+   done
+fi
+
+echo "$SUB"
+
+NAME="${SUB%%@*}" ; SUB="${SUB#*@}"
+NODE="${SUB%%:*}" ; SUB="${SUB#*:}"
+SPID="${SUB%%/*}" ; SUB="${SUB#*/}"
+SPID="$(ssh $NODE ps -hopid --ppid $SPID)"
+echo "NODE/SPID = $NODE/$SPID"
+LIVE="/$SUB"
+CMD="ip netns exec $NAME nsenter -t $SPID -m -p -i -u chroot $LIVE /bin/bash"
+CMD="nsenter -t $SPID -m -p -i -u ip netns exec $NAME chroot $LIVE /bin/bash"
+[ "$NODE" = "$(hostname -s)" ] || CMD="ssh -t $NODE $CMD"
+echo "$CMD"
+[ -z "$SPID" ] || exec $CMD
+echo "NOT A SUBHOST $LIVE???"