From c0c2c46b35f94de8c3c38a4247b0181d868e8c5b Mon Sep 17 00:00:00 2001
From: Q <q@moonq.org>
Date: Sat, 11 Jan 2025 20:42:12 +0200
Subject: [PATCH] mountpoint checker

---
 bin/is-mount   |  1 +
 files/is-mount | 45 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)
 create mode 120000 bin/is-mount
 create mode 100755 files/is-mount

diff --git a/bin/is-mount b/bin/is-mount
new file mode 120000
index 0000000..043c7eb
--- /dev/null
+++ b/bin/is-mount
@@ -0,0 +1 @@
+../files/is-mount
\ No newline at end of file
diff --git a/files/is-mount b/files/is-mount
new file mode 100755
index 0000000..3b01b38
--- /dev/null
+++ b/files/is-mount
@@ -0,0 +1,45 @@
+#!/bin/bash
+set -e
+function _help() {
+  echo '
+Usage: is-mount path
+
+  Checks if path is the mountpoint root folder
+
+  example:  is-mount -v /mnt/mountpoint
+
+  -v for verbose output
+
+  if path is a mountpoint: exit 0
+  If path is not a mountpoint: exit 10
+  if path is missing: exit 1
+  '
+  exit
+}
+verbose=0
+for (( i=1; i<=$#; i++ ))
+do  if [[ "${!i}" = "-h" ]]; then _help; fi
+    if [[ "${!i}" = "-v" ]]; then verbose=1; continue; fi
+    if [[ -z "$path1" ]]; then path1="${!i}"; continue; fi
+done
+if [[ -z "$path1" ]]; then _help; fi
+
+if [[ ! -e "$path1" ]]; then
+  echo "No such path '$path1'"
+  exit 1
+fi
+
+path1=$( realpath "$path1" )
+
+mountpoint1=$( stat -c "%m" "$path1" )
+
+if [[ "$path1" = "$mountpoint1" ]]; then
+  if [[ $verbose -eq 1 ]]; then
+    echo "$path1 is a mount point"
+  fi
+  exit 0
+fi
+if [[ $verbose -eq 1 ]]; then
+    echo "$path1 is not a mount point (it is $mountpoint1)"
+  fi
+exit 10