Silent Setup exit codes required by Microsoft Store: Disk Space full - inno-setup

Question

Microsoft Store seems to require nowadays a quite few EXE RETURN (exit) codes during Silent setup that are not available by default. How to e.g. return an exit code when the DISK is FULL? I can see its possible to return error code when reboot is required with /RESTARTEXITCODE=exit but it would be required to have exit codes also in these cases:
Application already exists
Installation already in progress
Disk space is full
More exe return codes listed here:
https://learn.microsoft.com/en-us/windows/uwp/publish/msiexe/provide-package-details
I can see the current Inno Setup exit codes here:
https://jrsoftware.org/ishelp/index.php?topic=setupexitcodes

Answer 1

Imo, you cannot really implement this cleanly in Inno Setup. You would have to re-implement the disk space check and forcefully abort the installation with the required custom exit code.
I recommend you add a "Store installation" command-line switch to your installer to enable all Store-related hacks you will likely need to implement.
Something like this:
[Code]
function IsStoreInstallation: Boolean;
begin
Result := WizardSilent() and CmdLineParamExists('/StoreInstallation');
end;
procedure StoreInstallationExit(Code: Integer);
begin
Log(Format('Aborting store installation with code %d', [Code]));
ExitProcess(Code);
end;
function PrepareToInstall(var NeedsRestart: Boolean): String;
var
Free, Total: Int64;
AbortCode: Integer;
begin
Log('prepare');
if IsStoreInstallation() then
begin
Log('Store installation, checking for available disk space');
AbortCode := 0;
if not GetSpaceOnDisk64(WizardDirValue, Free, Total) then
begin
Log('Failed to check for available disk space, aborting');
AbortCode := 15;
end
else
if Free < Int64(10) * 1024 * 1024 then
begin
Log(Format('Too low available disk space (%s), aborting', [
IntToStr(Free)]));
AbortCode := 15;
end
else
begin
Log(Format('Enough available disk space (%s)', [IntToStr(Free)]));
end;
if AbortCode <> 0 then
begin
StoreInstallationExit(AbortCode);
end;
end;
end;
For CmdLineParamExists, see Is it possible to accept custom command line parameters with Inno Setup
For ExitProcess, see Exit from Inno Setup installation from [Code]