From 2638ffcf8dc901606f3cdb249fab75e14ca47875 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Paul=20H=C3=A4nsch?= <paul@plutz.net>
Date: Thu, 9 May 2019 16:03:22 +0200
Subject: [PATCH] function for providing file transaction IDs

---
 session.sh | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/session.sh b/session.sh
index 25a6598..5bf8fad 100755
--- 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
 
-- 
2.39.2