Require overwrite confirmation for one specific file in Inno Setup, install other files in directory unconditionally

Question

I have a directory (Configurationfiles) containing 84 files. One of these files contains data that the user will modify (UserData.json). This file may or may not be there, but if it is I don't want to lose this data, and am trying to keep the install user friendly.

I am trying to modify an existing an install script that does all of the following:

If there are no files in the directory, copy all of them
If there are files overwrite all files except UserData.json
if UserData.json is missing copy default UserData.json
If UserData.json is present prompt user to overwrite UserData.json, if yes overwrite, if no don't

Currently all of the files are copied no matter what and I never get a prompt to overwrite. This is what I have so far:

#define ExcludeFiles "UserData.json"

Source: ..\..\PROV\4200701\BIN\*.*; Excludes: {#ExcludeFiles }; DestDir: {app}\BIN; \
  Flags: ignoreversion recursesubdirs skipifsourcedoesntexist;

Source: ..\..\PROV\4200701\BIN\Configurationfiles\UserData.json; \
  DestDir: {app}\BIN\Configurationfiles; 
  Flags: ignoreversion onlyifdoesntexist confirmoverwrite skipifsourcedoesntexist;

I think I have something set up incorrectly with the flags. But I am not sure. Does anyone see where I am going wrong?

pimpo pimpo · Accepted Answer · 2020-09-26T14:54:24

You can never get the confirmation, as the onlyifdoesntexist prevents the confirmoverwrite from ever taking any effect.

I do not think, that you are correct with "all of the files are copied no matter". When I test your script, I get:

2020-09-26 16:51:21.625 -- File entry --
2020-09-26 16:51:21.626 Dest filename: C:\Users\pimpo\AppData\Local\My Program\BIN\Configurationfiles\UserData.json
2020-09-26 16:51:21.626 Time stamp of our file: 2020-09-26 16:49:30.000
2020-09-26 16:51:21.626 Dest file exists.
2020-09-26 16:51:21.626 Skipping due to "onlyifdoesntexist" flag.

If you remove the onlyifdoesntexist, your script should do what you want.

2020-09-26 16:57:41.066 -- File entry --
2020-09-26 16:57:41.067 Dest filename: C:\Users\pimpo\AppData\Local\My Program\BIN\Configurationfiles\UserData.json
2020-09-26 16:57:41.067 Time stamp of our file: 2020-09-26 16:49:30.000
2020-09-26 16:57:41.067 Dest file exists.
2020-09-26 16:57:41.067 Time stamp of existing file: 2020-09-26 16:49:30.000
2020-09-26 16:57:41.067 Message box (Yes/No):
C:\Users\pimpo\AppData\Local\My Program\BIN\Configurationfiles\UserData.json

The file already exists.

Would you like Setup to overwrite it?
2020-09-26 16:57:43.055 User chose Yes.
2020-09-26 16:57:43.055 Installing the file.
2020-09-26 16:57:43.062 Successfully installed the file.

You might want to remove the ignoreversion too, as it has no effect on .json files. It may confuse others. The skipifsourcedoesntexist is also questionable.

Require overwrite confirmation for one specific file in Inno Setup, install other files in directory unconditionally

1 Answers