Browsing Spanish translation

47.

fakeroot is implemented by wrapping system calls. This is accomplished by setting LD_LIBRARY_PATH=/usr/lib/fakeroot and LD_PRELOAD=libfakeroot.so.0. That library is loaded before the system's C library, and so most of the library functions are intercepted by it. If you need to set either B<LD_LIBRARY_PATH> or B<LD_PRELOAD> from within a fakeroot environment, it should be set relative to the given paths, as in B<LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/foo/bar/>

48.

LIMITATIONS

49.

B<Library versions>

50.

Every command executed within B<fakeroot> needs to be linked to the same version of the C library as B<fakeroot> itself.

51.

B<open()/create()>

52.

fakeroot doesn't wrap open(), create(), etc. So, if user B<joost> does either

53.

touch foo
fakeroot
ls -al foo

54.

or the other way around,

55.

fakeroot
touch foo
ls -al foo

56.

fakeroot has no way of knowing that in the first case, the owner of foo really should be B<joost> while the second case it should have been B<root>. For the Debian packaging, defaulting to giving all "unknown" files uid=gid=0, is always OK. The real way around this is to wrap B<open()> and B<create()>, but that creates other problems, as demonstrated by the libtricks package. This package wrapped many more functions, and tried to do a lot more than B<fakeroot .> It turned out that a minor upgrade of libc (from one where the B<stat>() function didn't use B<open>() to one with a B<stat>() function that did (in some cases) use B<open>() ), would cause unexplainable segfaults (that is, the libc6 B<stat>() called the wrapped B<open>() , which would then call the libc6 B<stat>() , etc). Fixing them wasn't all that easy, but once fixed, it was just a matter of time before another function started to use open(), never mind trying to port it to a different operating system. Thus I decided to keep the number of functions wrapped by fakeroot as small as possible, to limit the likelihood of \(oqcollisions\(cq.