From e6131c25618c71912b17f6db2f5b081d4ab8f294 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dani=C3=ABl=20Groothuis?= <daniel.groothuis@trimm.nl>
Date: Sat, 25 Oct 2025 22:37:23 +0200
Subject: [PATCH] chore(maint): Added shell script to monitor disk space

---
 diskspace.sh | 144 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100755 diskspace.sh

diff --git a/diskspace.sh b/diskspace.sh
new file mode 100755
index 0000000..3969564
--- /dev/null
+++ b/diskspace.sh
@@ -0,0 +1,144 @@
+# filename: diskspace.sh
+#!/usr/bin/env bash
+set -euo pipefail
+
+SERVERS=(
+  "controller.dgse.cloud"
+  "worker-0.dgse.cloud"
+  "worker-1.dgse.cloud"
+)
+
+SSH_OPTS=(
+  -o BatchMode=no
+  -o ConnectTimeout=8
+  -o StrictHostKeyChecking=accept-new
+  -o ServerAliveInterval=10
+  -o ServerAliveCountMax=2
+)
+
+EXCLUDE_TYPES_REGEX='^(tmpfs|devtmpfs|overlay|squashfs|proc|sysfs|cgroup2?|pstore|rpc_pipefs|nsfs|bpf)$'
+EXCLUDE_MOUNTS_REGEX='^/(dev|proc|sys|run)(/|$)'
+
+to_mib() {
+  local val num u
+  val="$(echo "$1" | awk '{print toupper($0)}')"
+  if [[ "$val" =~ ^([0-9]*\.?[0-9]+)([KMGTPE]?)(I?B)?$ ]]; then
+    num="${BASH_REMATCH[1]}"
+    u="${BASH_REMATCH[2]}"
+    case "$u" in
+      "")   printf "%.0f\n" "$num" ;;
+      K)    awk -v n="$num" 'BEGIN{printf "%.0f\n", n/1024}' ;;
+      M)    printf "%.0f\n" "$num" ;;
+      G)    awk -v n="$num" 'BEGIN{printf "%.0f\n", n*1024}' ;;
+      T)    awk -v n="$num" 'BEGIN{printf "%.0f\n", n*1024*1024}' ;;
+      P)    awk -v n="$num" 'BEGIN{printf "%.0f\n", n*1024*1024*1024}' ;;
+      E)    awk -v n="$num" 'BEGIN{printf "%.0f\n", n*1024*1024*1024*1024}' ;;
+      *)    echo 0 ;;
+    esac
+  else
+    echo 0
+  fi
+}
+
+mib_pretty() {
+  local mib="$1"
+  if (( mib < 1024 )); then
+    printf "%d MiB" "$mib"
+  elif (( mib < 1024*1024 )); then
+    awk -v m="$mib" 'BEGIN{printf "%.2f GiB", m/1024}'
+  else
+    awk -v m="$mib" 'BEGIN{printf "%.2f TiB", m/1048576}'
+  fi
+}
+
+ssh_run() {
+  local user="$1" pass="$2" host="$3" cmd="$4"
+  if command -v sshpass >/dev/null 2>&1; then
+    SSHPASS="$pass" sshpass -e ssh "${SSH_OPTS[@]}" "${user}@${host}" "$cmd"
+  else
+    ssh "${SSH_OPTS[@]}" "${user}@${host}" "$cmd"
+  fi
+}
+
+check_host() {
+  local user="$1" pass="$2" host="$3"
+  local cmd='df -hPT || df -hP'
+  local output
+  if ! output="$(ssh_run "$user" "$pass" "$host" "$cmd" 2>&1)"; then
+    echo "ERROR: Failed to connect or run df on $host" >&2
+    echo "$output" >&2
+    # Emit zero so the caller can still aggregate safely
+    echo "__TOTAL__ $host 0 0"
+    return 1
+  fi
+
+  local total_mib=0
+  local avail_mib=0
+  local lines=0
+
+  while IFS= read -r line; do
+    [[ "$line" =~ ^Filesystem[[:space:]] ]] && continue
+    read -r fs type size used avail usep mount <<<"$line" || true
+    if [[ -z "$mount" ]]; then
+      read -r fs size used avail usep mount <<<"$line" || true
+      type="unknown"
+    fi
+    [[ -z "$fs" || -z "$size" || -z "$avail" || -z "$mount" ]] && continue
+    [[ "$type" =~ $EXCLUDE_TYPES_REGEX ]] && continue
+    [[ "$mount" =~ $EXCLUDE_MOUNTS_REGEX ]] && continue
+
+    local size_mib avail_mib_i
+    size_mib="$(to_mib "$size")"
+    avail_mib_i="$(to_mib "$avail")"
+    (( size_mib <= 0 )) && continue
+
+    total_mib=$(( total_mib + size_mib ))
+    avail_mib=$(( avail_mib + avail_mib_i ))
+    lines=$(( lines + 1 ))
+  done <<< "$output"
+
+  echo "Host: $host"
+  if (( lines == 0 )); then
+    echo "  No eligible filesystems found (might be a minimal container or all mounts excluded)."
+    echo
+  else
+    echo "  Total capacity:    $(mib_pretty "$total_mib")"
+    echo "  Remaining (free):  $(mib_pretty "$avail_mib")"
+    echo
+  fi
+  # Emit a parsable summary line for aggregation
+
+  overall_avail=$(( overall_avail + avail_mib ))
+  echo "__TOTAL__ $host $total_mib $avail_mib"
+}
+
+main() {
+  local username
+  read -r -p "SSH username: " username
+  echo
+
+  local overall_total=0
+  local overall_avail=0
+  local ok_hosts=0
+
+  # Call check_host for each and parse the emitted summary lines
+  for host in "${SERVERS[@]}"; do
+    check_host "$username" "none" "$host"
+  done | while read -r tag host total avail; do
+    if [[ "$tag" == "__TOTAL__" ]]; then
+      overall_total=$(( overall_total + total ))
+      overall_avail=$(( overall_avail + avail ))
+      (( total > 0 || avail > 0 )) && ok_hosts=$(( ok_hosts + 1 ))
+    else
+      # Pass through the human-readable lines
+      echo "$tag $host $total $avail"
+    fi
+  done
+
+  echo "Summary:"
+  echo "  Hosts processed: $ok_hosts/${#SERVERS[@]}"
+  echo "  Combined total capacity:   $(mib_pretty "$overall_total")"
+  echo "  Combined remaining (free): $(mib_pretty "$overall_avail")"
+}
+
+main "$@"