function for providing file transaction IDs

diff --git a/session.sh b/session.sh
index 25a65987c3671df4f4c8499279a71487edad5775..5bf8fad83a8067d72d432a73fd2784568b8694f9 100755 (executable)
--- a/session.sh
+++ b/session.sh
@@ -41,6 +41,15 @@ timeid(){
 
 checkid(){ grep -m 1 -xE '[0-9a-zA-Z:=]{16}'; }
 
+transid(){
+  # transaction ID to modify a given file
+  local file="$1"
+  { stat -c %F%i%n%N%s%Y "$file" 2>&-
+    printf %s "$SESSION_ID"
+    server_key
+  } | sha256sum | cut -d\  -f1
+}
+
 update_session(){
   local session sid time sig serverkey checksig