# HG changeset patch
# User Alain Leufroy
# Date 1615049839 -3600
#      Sat Mar 06 17:57:19 2021 +0100
# Node ID 1c7539e31415e64bbb6690b672aa05bcd118e5cf
# Parent  6060534cfe2c5b9c03616ff622eb14cd4cdbd751
dump: prevent writting info file on errors

diff --git a/overlayctl b/overlayctl
--- a/overlayctl
+++ b/overlayctl
@@ -217,14 +217,11 @@
 
     def dump(self):
         """Write the given overlay metadata to disk."""
-        data = {
+        info = {
             'name': self.name,
             'lowers': [lower.name for lower in self.lowers]
         }
-        self.infopath.write_text(
-            json.dumps(data, indent=2), encoding='utf-8'
-        )
-        logger.debug('%s updated', self.infopath)
+        data = info.copy()
         data['lowerdir'] = ':'.join(
             str(lower.lowerdir).replace('\\', '\\\\')
             for lower in self.get_ascendants()
@@ -232,6 +229,10 @@
         data['upperdir'] = str(self.upperdir).replace('\\', '\\\\')
         data['workdir'] = str(self.workdir).replace('\\', '\\\\')
         data['mountdir'] = str(self.mountdir).replace('\\', '\\\\')
+        self.infopath.write_text(
+            json.dumps(info, indent=2), encoding='utf-8'
+        )
+        logger.debug('%s written.', self.infopath)
         self.upperdir.mkdir(parents=True, exist_ok=True)
         self.workdir.mkdir(parents=True, exist_ok=True)
         self.mountdir.mkdir(parents=True, exist_ok=True)