FM / libfakeroot

/usr/share/doc/libfakeroot

Name	Size	Mode	Actions
changelog.Debian.gz	964	0644	edit dl rm
copyright	1108	0644	edit dl rm
DEBUG	1872	0644	edit dl rm
README	521	0644	edit dl rm
README.saving	2724	0644	edit dl rm

Edit: /usr/share/doc/libfakeroot/DEBUG (1872B)

To debug fakeroot, one may try:

Start faked in xterm 1:   
  $ faked --foreground --debug
  51452231:280
     # First number here is the 'FAKEROOTKEY', second is the pid of
     # faked. Both to be used later.
     # Later, when programs go using faked, a _lot_ of debug output
     # will be shown here.

Send signals to faked in xterm 2:
  #Whenever you want to get info about the internal inode data
  #faked is keeping, do:
  kill -s USR1 280

And the  'real' program runs (at your choise) in another xterm [3], or gdb
  In an xterm, do:
    $ LD_PRELOAD=/usr/lib/libfakeroot/libfakeroot.so.0
    $ FAKEROOTKEY=51452231   # number output by faked, xterm 1
    $ export LD_PRELOAD FAKEROOTKEY
    $ my-prog          #start anything you like.

Or, if you want to run the programme in a gdb session:
  To make specifying the paths easier, put libfakeroot.c, libfakeroot.so.0.0.1
  and the binary you want to run in the same directory (libfakeroot.so.0.0.1
  is put in ./.libs/libfakeroot.so.0.0.1 by libtool during compilation, copy
  it out there).
  Then, in gdb do:
    $ gdb ./ls #as an example, I run 'ls'.
    (gdb) set env LD_PRELOAD=/home/joost/maintain/vpathlib/libfakeroot-0.1/libfakeroot.so.0.0.1
    (gdb) set env FAKEROOTKEY=51452231 #number from xterm 1.
     # Or wherever you've got your libfakeroot.so.0.0.1
    (gdb) break libfakeroot.c:181
    Breakpoint 1 at 0x4000ecc8: file libfakeroot.c, line 181.
    (gdb) run -al
    Starting program: /home/joost/maintain/vpathlib/libfakeroot-0.1/ls -al
    Temporarily disabling shared library breakpoints:
    1
    
    Breakpoint 1, __lxstat (ver=134556187, file_name=0x0, statbuf=0x80529c8)
    	at libfakeroot.c:208
    208                  struct stat *statbuf){
    
    # OK, and there I've found a bug -- ver can only be '0' in the
    # current libc6 (glibc2). Unfortunately, it didn't reproduce.

cmd: