2 commits

Author	SHA1	Message	Date
Eelco Dolstra	b7fd2c2822	Use "#pragma once" to prevent repeated header file inclusion	2012-07-18 14:59:03 -04:00
Eelco Dolstra	bd013b6f98	On Linux, make the Nix store really read-only by using the immutable bit ... I was bitten one time too many by Python modifying the Nix store by creating *.pyc files when run as root. On Linux, we can prevent this by setting the immutable bit on files and directories (as in ‘chattr +i’). This isn't supported by all filesystems, so it's not an error if setting the bit fails. The immutable bit is cleared by the garbage collector before deleting a path. The only tricky aspect is in optimiseStore(), since it's forbidden to create hard links to an immutable file. Thus optimiseStore() temporarily clears the immutable bit before creating the link.	2012-02-15 01:31:56 +01:00