How do you set directory permissions in NSIS?

Question

I'm trying to build a Windows installer using Nullsoft Install System that requires installation by an Administrator. The installer makes a "logs" directory. Since regular users can run this application, that directory needs to be writable by regular users. How do I specify that all users should have permission to have write access to that directory in the NSIS script language?

I admit that this sounds a like a sort of bad idea, but the application is just an internal app used by only a few people on a private network. I just need the log files saved so that I can see why the app is broken if something bad happens. The users can't be made administrator.

Answer 1

Use the AccessControl plugin and then add this to the script, where the "logs" directory is in the install directory.

AccessControl::GrantOnFile "$INSTDIR\logs" "(BU)" "FullAccess"

That gives full access to the folder for all users.

Answer 2

AccessControl::GrantOnFile "<folder>" "(BU)" "FullAccess" didn't work for me on a Windows Server 2008 machine. Instead I had to use this one:

AccessControl::GrantOnFile "<folder>" "(S-1-5-32-545)" "FullAccess"

S-1-5-32-545 is equivalente to "Users" according to http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q243330

Answer 3

Instead of changing the permissions on directories under Program Files, why not put the logs in a location that is writeable by all users.

See the 4.9.7.7 SetShellVarContext section in your NSIS documentation. You can use it with $APPDATA to get the application data folder that is writeable for all users.

Answer 4

It's an old issue now but as suggested by Sören APPDATA directory is a nice way to do what you want, the thing is : Don't take user's personnal APPDATA but the "All Users" APPDATA dir! This way anyone will be able to access the log file ;-)

Also, I read somewhere that using (BU) on the GrantOnFile is not working well with some systems (Win 7 x64 if I remember well), maybe you should use the SID "(S-1-5-32-545)" instead (it's the All Users' SID, this value is a constant on each Windows OS)

Answer 5

One way: call the shell, and use cacls or xcacls.

Answer 6

Why not create a log-directory in the user's %APPDATA% directory? Do you really need to put all the logs in the install directory? Why?