Martin Koeppe <[EMAIL PROTECTED]> wrote: > On Wed, 3 Oct 2007, Jim Meyering wrote: >> Martin Koeppe <[EMAIL PROTECTED]> wrote: >>> A question arises: How should one portably test for "root"? Neither >>> "root" nor uid 0 seem to be a POSIX requirement. I found one solution >>> so far, but I'm not sure how good it really is: >>> >>> For shell scripts run: >>> $ /usr/sbin/chroot / /bin/true >>> If successful, you have root rights. >> >> I'm leery of this. >> What if chroot works for non-privileged users on some type of system? >> >> Since Interix is the problem here, how about adding >> a test that'd be run solely on that system? > > Yes, no problem with that. I only thought there might be a > possibility to check the root-ness without an explicit comparison of > uid or username. This need not necessarily be the chroot() function. > But I don't know the POSIX standard in that detail. > > If you want an explicit check, then for Interix 3 different users/uids > must be checked: System (uid ???), Domain Administrator (uid 1049076) > and local Administrator (uid 197108). All of these have "root" rights. > See: http://www.interopcommunity.com/faqs.aspx#307
But those are all legitimate, non-root IDs on other systems, so a test based solely on that would risk false positives. There has to be something else (interix-specific) that will ensure that part of the test is run only on Interix.
