From 61fbf5729ad03777430019b06479294a1cf62538 Mon Sep 17 00:00:00 2001
From: Jonas Tobias Hopusch <git@jotoho.de>
Date: Tue, 10 Jan 2023 21:11:07 +0100
Subject: [PATCH] Implement reversal script cd-umount.sh

---
 cd-umount.sh | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 81 insertions(+), 2 deletions(-)
 mode change 100644 => 100755 cd-umount.sh

diff --git a/cd-umount.sh b/cd-umount.sh
old mode 100644
new mode 100755
index 3b7587a..5d75285
--- a/cd-umount.sh
+++ b/cd-umount.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 #=======================================================================
 #           FILE: cd-umount.sh
-#          USAGE: cd-umount.sh [<Verzeichnis, welches bearbeitet werden sollte>]
+#          USAGE: cd-umount.sh [<Imageverzeichnis>]
 #    DESCRIPTION:
 #        OPTIONS:
 #   REQUIREMENTS:
@@ -13,7 +13,86 @@
 #        CREATED: 2023-01-10T16:32Z
 #       REVISION:
 #=======================================================================
+#-----------------------------------------------------------------------
+#   Abort script if undefined veriables are referenced
+#   and properly handle pipe failure
+#-----------------------------------------------------------------------
+set -uo pipefail
 
 #-----------------------------------------------------------------------
-#   COMMENT
+#   Script configuration
 #-----------------------------------------------------------------------
+imageFileEnding='.image'
+defaultTargetDir="$HOME/CDs/"
+
+#-----------------------------------------------------------------------
+#   Check if fuseiso and fusermount are present
+#-----------------------------------------------------------------------
+if ! which 'fuseiso' >/dev/null 2>&1; then
+    echo 'fuseiso is not installed'
+    exit 1
+elif ! which 'fusermount' >/dev/null 2>&1; then
+    echo 'fusermount is not installed'
+    exit 1
+fi
+
+#-----------------------------------------------------------------------
+#   Determine target directory
+#-----------------------------------------------------------------------
+if [ -v 1 ]; then
+    targetDir="$1"
+else
+    targetDir="$defaultTargetDir"
+fi
+
+#-----------------------------------------------------------------------
+#   Search for matching images
+#-----------------------------------------------------------------------
+
+#shellcheck disable=SC2006
+readarray -t imageFiles \
+     <<<"`find "$targetDir" -type f -iname "*$imageFileEnding" 2>/dev/null`" \
+    >/dev/null 2>&1
+
+#-----------------------------------------------------------------------
+#   Per Image, do the following
+#-----------------------------------------------------------------------
+amountOfImages="${#imageFiles[@]}"
+successfullyUnmountedImages=0
+for image in "${imageFiles[@]}"; do
+    # Count how many there are in total
+    #((amountOfImages++))
+
+    # Validate that it is a valid regular file
+    if ! [ -f "$image" ]; then
+        echo "$image is not a regular file. Skipping."
+        continue
+    fi
+
+    # Determine the location the image should be unmounted from
+    mountDirName="${image:0:((${#image} - ${#imageFileEnding}))}"
+    if ! [ -d "$mountDirName" ]; then
+        echo "Directory $mountDirName does not exist. Skipping!"
+        continue
+    fi
+
+    # Check if there's already an image mounted at the destination
+    #shellcheck disable=SC2006
+    fullPathMountDir="`cd "$mountDirName" && pwd`"
+    if ! grep "^fuseiso $fullPathMountDir " /proc/mounts >/dev/null 2>&1; then
+        echo "No image is mounted to $mountDirName. Skipping"
+        continue
+    fi
+
+    # Attempt to mount the image to the destination directory
+    if fusermount -u "$mountDirName"; then
+        echo "$image has been unmounted from $mountDirName"
+        ((successfullyUnmountedImages++))
+    fi
+
+    rmdir "$mountDirName"
+done
+
+find "$targetDir/" -mindepth 1 -maxdepth 1 -type d -delete 2>/dev/null
+
+echo "$successfullyUnmountedImages/$amountOfImages images have been unmounted successfully"