Unsecure permissions for /tmp/tuniqueinstance_USER_cudatext.0

[bogen85]

Where USER is the username of the one running CudaText.

This is a follow up to #4079 which was closed (as the issue of uniqueness of the name on a multi user system was resolved).

CudaText 1.162.5.0 contained the fix for #4079 but the permissions issue noted there is still unresolved in that release.

Permission should be 0600 on unix-like systems, not 0664
( rw------- instead of rw-rw-r-- )

This issue serves a placeholder until the permissions issue is resolved.

[Alexey-T]

Currently this filename is createed very deeply in FPC code so I (not sure) don't have access to this filename (no property for filename, seems).

[bogen85]

Understood. I'll take a look when I get a chance and see if I can figure something out.

One of the proposed fixes for #4079 was to put this file in a temp folder in the user's home directory.

This would mitigate the permissions issue as well, if it is possible to use a folder in the user's home directory.

[Alexey-T]

For that, we need to change GetTempDir(true) to GetTempDir(false) here

constructor TPipeClientComm.Create(AOWner: TSimpleIPCClient);
begin
  inherited Create(AOWner);
  FFileName:=Owner.ServerID;
  If (Owner.ServerInstance<>'') then
    FFileName:=FFileName+'-'+Owner.ServerInstance;
  if FFileName[1]<>'/' then
    FFileName:=GetTempDir(true)+FFileName;
end;

this is in FPC again.
fpcsrc/packages/fcl-process/src/unix/simpleipc.inc

[Alexey-T]

Made an issue
https://gitlab.com/freepascal.org/fpc/source/-/issues/39690