Inno Setup specify log name within the installer - inno-setup

Question

Setting SetupLogging=yes creates the a file:
%TEMP%\Setup Log YYYY-MM-DD #NNN.txt
Is there any way to specify the name of the file? Note that I know I can rename it using FileCopy at the end of the installation (How can I log Inno Setup installations?), but I simply want to specify the name of the file at the outset, much like can be done with the switch /log=%TEMP%\ProductInstall.log. Is this possible?

Answer 1

No. It's not possible. The log file name format for the SetupLogging is hard-coded.
All you can do it to check in InitializeSetup, if /LOG= was specified on command-line and if not, re-spawn the installer with the /LOG=.
Though it's somewhat an overkill.
function ShellExecute(hwnd: HWND; lpOperation: string; lpFile: string;
lpParameters: string; lpDirectory: string; nShowCmd: Integer): THandle;
external 'ShellExecuteW#shell32.dll stdcall';
function InitializeSetup(): Boolean;
var
HasLog: Boolean;
Params: string;
I: Integer;
S: string;
RetVal: Integer;
begin
HasLog := False;
Params := '';
for I := 1 to ParamCount do
begin
S := ParamStr(I);
if CompareText(Copy(S, 1, 5), '/LOG=') = 0 then
begin
HasLog := True;
break;
end;
// Do not pass our /SL5 switch
// This should not be needed since Inno Setup 6.2,
// see https://groups.google.com/g/innosetup/c/pDSbgD8nbxI
if CompareText(Copy(S, 1, 5), '/SL5=') = 0 then
begin
Params := Params + AddQuotes(S) + ' ';
end;
end;
Result := True;
if HasLog then
begin
Log('Log specified, continuing.');
end
else
begin
// add selected language, so that user is not prompted again
Params := Params + ' /LANG=' + ActiveLanguage;
// force logging
Params :=
Params + ' /LOG="' + ExpandConstant('{%TEMP}\ProductInstall.log') + '"';
Log(Format('Log file not specified, restarting setup with [%s]', [Params]));
RetVal :=
ShellExecute(0, '', ExpandConstant('{srcexe}'), Params, '', SW_SHOW);
Log(Format('Restarting setup returned [%d]', [RetVal]));
if RetVal > 32 then
begin
Log('Restart with logging succeeded, aborting this instance');
Result := False;
end
else
begin
Log(Format('Restarting with logging failed [%s], keeping this instance', [
SysErrorMessage(RetVal)]));
end;
end;
end;

Answer 2

Here's what I came up with to rename the log after setup completes. This is a bit tricky because you can't rename it while Inno Setup's still using it, but using start and timeout I was able to spin off a separate cmd process that waits a second, then does the rename.
[Run]
; Rename the log file to My_setup_log.txt.
Filename: "{cmd}"; WorkingDir: "{%TEMP}"; Parameters: "/d /c start "" "" /b cmd /d /c ""timeout 1 >NUL & del My_setup_log.txt 2>NUL & ren """"""{log}"""""" My_setup_log.txt"""; Flags: runhidden
As you can see, getting the proper number of quotes to surround the filenames in the quoted cmd argument requires six quotes in the Inno Setup command. If you want spaces in your renamed log file, put the six quotes on either side of it too. Yes, this would mean the string will end with nine consecutive quote marks!