1 files changed, 7 insertions, 4 deletions

diff --git a/meta/classes/reproducible_build.bbclass b/meta/classes/reproducible_build.bbclass
index 89f645b858..7571c116c8 100644
--- a/meta/classes/reproducible_build.bbclass
+++ b/meta/classes/reproducible_build.bbclass
@@ -115,11 +115,14 @@ EPOCHTASK = "do_deploy_source_date_epoch"
 do_unpack[postfuncs] += "create_source_date_epoch_stamp"
 
 def get_source_date_epoch_value(d):
-    cached = d.getVar('__CACHED_SOURCE_DATE_EPOCH')
-    if cached:
+    epochfile = d.getVar('SDE_FILE')
+    cached, efile = d.getVar('__CACHED_SOURCE_DATE_EPOCH') or (None, None)
+    if cached and efile == epochfile:
         return cached
 
-    epochfile = d.getVar('SDE_FILE')
+    if cached and epochfile != efile:
+        bb.debug(1, "Epoch file changed from %s to %s" % (efile, epochfile))
+
     source_date_epoch = int(d.getVar('SOURCE_DATE_EPOCH_FALLBACK'))
     try:
         with open(epochfile, 'r') as f:
@@ -137,7 +140,7 @@ def get_source_date_epoch_value(d):
     except FileNotFoundError:
         bb.debug(1, "Cannot find %s. SOURCE_DATE_EPOCH will default to %d" % (epochfile, source_date_epoch))
 
-    d.setVar('__CACHED_SOURCE_DATE_EPOCH', str(source_date_epoch))
+    d.setVar('__CACHED_SOURCE_DATE_EPOCH', (str(source_date_epoch), epochfile))
     return str(source_date_epoch)
 
 export SOURCE_DATE_EPOCH ?= "${@get_source_date_epoch_value(d)}"