Better handling of existing config files

When existing configuration files are found, in interactive mode the
user is asked if the existing config file should be kept and the newly
generated file is stored aside as config.new.

Also, the user can choose to move the existing file to config.old, and
install the new one in the original place.
This is what is done in silent installation mode.

The default for the uninstaller is now to keep existing config files.
In silent mode, the uninstaller will remove existing config files.

Fixes #140: Winbareos installer renames old config when updating

Signed-off-by: Marco van Wieringen <marco.van.wieringen@bareos.com>

platforms/win32/winbareos.nsi

@@ -147,12 +147,24 @@ Page custom displayDirconfSnippet
  SetShellVarContext all
 
   ${If} ${FileExists} "$APPDATA\${PRODUCT_NAME}\${fname}"
-  IfSilent +2
-  MessageBox MB_OK|MB_ICONEXCLAMATION \
-    "Existing config file found: $APPDATA\${PRODUCT_NAME}\${fname}$\r$\nmoving to $APPDATA\${PRODUCT_NAME}\${fname}.old"
-    Rename "$APPDATA\${PRODUCT_NAME}\${fname}" "$APPDATA\${PRODUCT_NAME}\${fname}.old"
+  MessageBox MB_YESNO|MB_ICONQUESTION \
+    "Existing config file found: $APPDATA\${PRODUCT_NAME}\${fname}$\r$\nKeep existing config file?" \
+    /SD IDNO IDYES keep IDNO move
+    move:
+      Rename "$APPDATA\${PRODUCT_NAME}\${fname}" "$APPDATA\${PRODUCT_NAME}\${fname}.old"
+      Rename "$PLUGINSDIR\${fname}" "$APPDATA\${PRODUCT_NAME}\${fname}"
+      MessageBox MB_OK|MB_ICONINFORMATION \
+        "Existing config file saved as $APPDATA\${PRODUCT_NAME}\${fname}.old" \
+        /SD IDOK
+    GOTO +3
+    keep:
+      Rename "$PLUGINSDIR\${fname}" "$APPDATA\${PRODUCT_NAME}\${fname}.new"
+      MessageBox MB_OK|MB_ICONINFORMATION \
+        "New config file stored $APPDATA\${PRODUCT_NAME}\${fname}.new" \
+        /SD IDOK
+  ${Else}
+    Rename "$PLUGINSDIR\${fname}" "$APPDATA\${PRODUCT_NAME}\${fname}"
   ${EndIf}
- Rename "$PLUGINSDIR\${fname}" "$APPDATA\${PRODUCT_NAME}\${fname}"
  CreateShortCut "$SMPROGRAMS\${PRODUCT_NAME}\Edit ${fname}.lnk" "write.exe" '"$APPDATA\${PRODUCT_NAME}\${fname}"'
 !macroend
 
@@ -562,6 +574,7 @@ Function .onInit
   File "/oname=$PLUGINSDIR\sed.exe"  	         "sed.exe"
   File "/oname=$PLUGINSDIR\libcrypto-8.dll" 	   "libcrypto-8.dll"
   File "/oname=$PLUGINSDIR\libgcc_s_sjlj-1.dll" "libgcc_s_sjlj-1.dll"
+#  File /nonfatal "/oname=$PLUGINSDIR\libgcc_s_seh-1.dll"  "libgcc_s_seh-1.dll"
   File "/oname=$PLUGINSDIR\libssl-8.dll" 	      "libssl-8.dll"
   File "/oname=$PLUGINSDIR\libstdc++-6.dll" 	   "libstdc++-6.dll"
   File "/oname=$PLUGINSDIR\zlib1.dll" 	         "zlib1.dll"
@@ -759,7 +772,7 @@ Section Uninstall
 # ask if existing config files should be kept
   IfSilent +2
   MessageBox MB_YESNO|MB_ICONQUESTION \
-    "Do you want to delete the existing configuration files?" /SD IDYES IDNO ConfDeleteSkip
+    "Do you want to keep the existing configuration files?" /SD IDYES IDYES ConfDeleteSkip
 
   Delete "$APPDATA\${PRODUCT_NAME}\bareos-fd.conf"
   Delete "$APPDATA\${PRODUCT_NAME}\tray-monitor.conf"