Add container helper for listing container stats

nix-script-container-stats.sh

@@ -0,0 +1,78 @@
+#!/usr/bin/env
+
+source $(dirname ${BASH_SOURCE[0]})/nix-utils.sh
+
+usage() {
+    cat <<EOS >&2
+    $(help_synopsis "container" "stats [-h] [-t]")
+
+    -t | Do not print table header
+    -h | Show this help and exit
+
+$(help_end "container")
+EOS
+}
+
+HEADER=1
+
+while getopts "th" OPTION
+do
+    case $OPTION in
+        t)
+            HEADER=0
+            dbg "HEADER = $HEADER"
+            ;;
+
+        h)
+            usage
+            exit 1
+            ;;
+    esac
+done
+
+stdout "Listing containers"
+containers=$(sudo nixos-container list)
+
+stdout "Building table layout"
+longestname=$(echo $containers | awk '{print length}' | sort -nr | head -n 1)
+
+__FMT_IP__=" | %-15s"
+__FMT_STAT__=" | %-6s"
+__FMT_HKEY__=" | %-15s"
+
+__FORMAT__="%-${longestname}s${__FMT_IP__}${__FMT_STAT__}${__FMT_HKEY__}\n"
+
+stdout "Ready building table layout"
+
+stdout "Starting table"
+repeat_char() {
+    local str=$1
+    local num=$2
+    local v=$(printf "%-${num}s" "$str")
+    echo "${v// /$str}"
+}
+
+[[ $HEADER -eq 1 ]] && \
+    printf "$__FORMAT__" Name IP Status Host-Key && \
+    printf "$__FORMAT__" "$(repeat_char "-" $longestname)"\
+                         "$(repeat_char "-" 15)"\
+                         "$(repeat_char "-" 6)"\
+                         "$(repeat_char "-" 15)"
+
+for name in $containers
+do
+    stdout "Calling nixos-container with"
+    stdout "'show-ip'"
+    stdout "'status'"
+    stdout "'show-host-key'"
+    stdout "in sudo now..."
+
+    ip="$(sudo nixos-container show-ip $name)"
+    stat="$(sudo nixos-container status $name)"
+    hkey="$(sudo nixos-container show-host-key $name)"
+
+    printf "$__FORMAT__" "$name" "$ip" "$stat" "$hkey"
+done
+
+stdout "Ready printing table"
+