From 3768d0e77b6c8b2a9f3a130326acf6bd1349bb63 Mon Sep 17 00:00:00 2001
From: Raphael Dannecker <raphael.dannecker@steinbeisschule-reutlingen.de>
Date: Sat, 7 Oct 2023 12:00:42 +0200
Subject: [PATCH] remove old qcows if filesize on server has changed

---
 roles/lmn_vm/files/sync-vm.sh   | 17 +++++++++++++++++
 roles/lmn_vm/files/upload-vm.sh |  5 +++++
 2 files changed, 22 insertions(+)

diff --git a/roles/lmn_vm/files/sync-vm.sh b/roles/lmn_vm/files/sync-vm.sh
index 136f34c..c5a219e 100755
--- a/roles/lmn_vm/files/sync-vm.sh
+++ b/roles/lmn_vm/files/sync-vm.sh
@@ -65,8 +65,25 @@ sync_all_images() {
 	  /lmn/vm/
 }
 
+delete_old_qcows() {
+    cd /lmn/vm
+    for qcow2 in *.qcow2; do
+	qcowsize=$(stat -c%s "${qcow2}")
+	if [[ -f "${qcow2}.size" ]] && [[ "${qcowsize}" != $(<"${qcow2}.size") ]]; then
+            torrent="${qcow2}.torrent"
+            session="${torrent//./_}"
+            if vmimage-torrent status | grep -qw ^"$session"; then
+                vmimage-torrent stop "${qcow2}"
+            fi
+	    rm "${qcow2}"
+	fi
+    done 
+}
+
 sync_all_torrents() {
     rsync -ai rsync://server:/vmimages-download/*.torrent /lmn/vm/
+    rsync -ai rsync://server:/vmimages-download/*.size /lmn/vm/
+    delete_old_qcows
     rsync -ai rsync://server:/vmimages-download/*.xml /lmn/vm/
     RSYNC_COMMAND=$(rsync -ai --delete --exclude=mimeinfo.cache rsync://server:/vmimages-download/desktop/ /usr/local/share/applications/ | sed '/ \.\//d')
     if [[ $? -eq 0 ]] && [[ -n "${RSYNC_COMMAND}" ]]; then
diff --git a/roles/lmn_vm/files/upload-vm.sh b/roles/lmn_vm/files/upload-vm.sh
index 5b66b14..7a05074 100755
--- a/roles/lmn_vm/files/upload-vm.sh
+++ b/roles/lmn_vm/files/upload-vm.sh
@@ -42,9 +42,14 @@ upload_image() {
     cd /lmn/vm
     # (re-) create torrent file
     sudo -u lmnsynci /usr/local/bin/vmimage-torrent create "${VM_NAME}.qcow2"
+    # create size-information-file
+    stat -c%s "${VM_NAME}.qcow2" > "${VM_NAME}.qcow2.size"
+    chown lmnsynci:lmnsynci "${VM_NAME}.qcow2.size"
     # Upload Torrent, qcow2 and machine-definition-XML
     [[ -f "/lmn/vm/${VM_NAME}.qcow2.torrent" ]] && rsync -av --password-file=/etc/rsync.secret \
 	  "/lmn/vm/${VM_NAME}.qcow2.torrent" rsync://vmuser@server:/vmimages-upload/
+    rsync -av --password-file=/etc/rsync.secret "/lmn/vm/${VM_NAME}.qcow2.size" \
+	  rsync://vmuser@server:/vmimages-upload/
     rsync -av --password-file=/etc/rsync.secret "/lmn/vm/${VM_NAME}.qcow2" \
 	  rsync://vmuser@server:/vmimages-upload/
     rsync -av --password-file=/etc/rsync.secret "/lmn/vm/${VM_NAME}.xml" \