some change into an actual framework

driver.sh

@@ -0,0 +1,34 @@
+#! /bin/sh
+cd "$(dirname "$0")" || exit 1
+
+ok() {
+    echo "[OK]   $3"
+}
+
+warn() {
+    echo "[WARN] $3"
+}
+
+run_module() {
+    set -eu
+
+    . "$1"
+    echo "$name"
+
+    if [ "$available" -ne 1 ]; then
+        echo "- not available"
+        return
+    fi
+
+    check
+}
+
+ls modules | while IFS= read -r module; do
+    [ -f "modules/$module" ] || continue
+    ( run_module "modules/$module" ) 
+    if [ "$?" -ne 0 ]; then
+        echo "Error running module: $module"
+        echo
+    fi
+    echo
+done

fs.sh

@@ -1,44 +0,0 @@
-#!/bin/sh
-
-THRESHOLD=90
-
-echo "Checking disk usage (>= $THRESHOLD%)"
-df -P | while IFS= read -r line; do
-    case "$line" in
-        Filesystem*|"") continue ;;
-    esac
-
-    fs=$(printf '%s\n' "$line" | awk '{print $1}')
-    usep=$(printf '%s\n' "$line" | awk '{print $5}' | tr -d '%')
-    mountp=$(printf '%s\n' "$line" | awk '{print $6}')
-
-    # skip empty or loop devices
-    case "$fs" in
-        ""|/dev/loop*) continue ;;
-    esac
-
-    if [ "$usep" -ge "$THRESHOLD" ] 2>/dev/null; then
-        printf 'WARNING: %s is %s%% full (mounted on %s)\n' "$fs" "$usep" "$mountp"
-    fi
-done
-
-echo
-echo "Checking inode usage (>= $THRESHOLD%)"
-df -P -i | while IFS= read -r line; do
-    case "$line" in
-        Filesystem*|"") continue ;;
-    esac
-
-    fs=$(printf '%s\n' "$line" | awk '{print $1}')
-    usep=$(printf '%s\n' "$line" | awk '{print $5}' | tr -d '%')
-    mountp=$(printf '%s\n' "$line" | awk '{print $6}')
-
-    # skip empty or loop devices
-    case "$fs" in
-        ""|/dev/loop*) continue ;;
-    esac
-
-    if [ "$usep" -ge "$THRESHOLD" ] 2>/dev/null; then
-        printf 'WARNING: %s has %s%% inode usage (mounted on %s)\n' "$fs" "$usep" "$mountp"
-    fi
-done

modules/fs-capacity.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+
+THRESHOLD=90
+
+name='Filesystem Usage'
+available=1
+recommend=1
+
+check() {
+    df -P | while IFS= read -r line; do
+        case "$line" in
+            Filesystem*|"") continue ;;
+            /dev/loop*) continue ;;
+        esac
+
+        fs=$(printf '%s\n' "$line" | awk '{print $1}')
+        usep=$(printf '%s\n' "$line" | awk '{print $5}' | tr -d '%')
+        mountp=$(printf '%s\n' "$line" | awk '{print $6}')
+
+        if [ "$usep" -ge "$THRESHOLD" ] 2>/dev/null; then
+            warn "$mountp" "$usep" "$fs mounted at $mountp is $usep% full"
+        else
+            ok "$mountp" "$usep" "$fs mounted at $mountp is $usep% full"
+        fi
+    done
+}

modules/fs-inode.sh

@@ -0,0 +1,32 @@
+#!/bin/sh
+
+THRESHOLD=90
+
+name='Filesystem Inode Usage'
+available=1
+recommend=1
+
+check() {
+    df -i -P | while IFS= read -r line; do
+        case "$line" in
+            Filesystem*|"") continue ;;
+            /dev/loop*) continue ;;
+        esac
+
+        fs=$(printf '%s\n' "$line" | awk '{print $1}')
+        use_count=$(printf '%s\n' "$line" | awk '{print $3}')
+        usep=$(printf '%s\n' "$line" | awk '{print $5}' | tr -d '%')
+        mountp=$(printf '%s\n' "$line" | awk '{print $6}')
+
+        if [ "$use_count" -eq 0 ] 2>/dev/null; then
+            # likely a file system with no inodes, skip it
+            continue
+        fi
+
+        if [ "$usep" -ge "$THRESHOLD" ] 2>/dev/null; then
+            warn "$mountp" "$usep" "$fs mounted at $mountp has $usep% inode usage"
+        else
+            ok "$mountp" "$usep" "$fs mounted at $mountp has $usep% inode usage"
+        fi
+    done
+}