Changes for v2:

Drop use of g_canonicalize_filename.

While Daniel pointed out how to add stuff to glib-compat.h,
full canonicalization is overkill for path() in any case.
I also discovered that I'd been testing w/ glib 2.56 and so
hadn't been testing the g_canonicalize_filename case anyway.

Cover from v1:

This is a third variant attempting to fix the problem of
the -L interp_prefix handling not coping well pointing to
a full chroot.

Previous versions include:
https://lists.gnu.org/archive/html/qemu-devel/2018-05/msg06592.html
https://lists.gnu.org/archive/html/qemu-devel/2018-05/msg07304.html

Both of the other versions keep an open file descriptor to
the directory that is interp_prefix.  While this seems to be
efficient, they also leak a file descriptor into the guest.
This has follow-on effects on the emulation, causing failures
e.g. within the LTP testsuite.

This version uses only string manipulation and access(2).

A plausible criticism of this is the mutex and the cache.
Are they really needed?  I have no idea.  I can imagine
removing that is actually more efficient, not needing a
lock around a shared data structure.


r~


Richard Henderson (1):
  util/path: Do not cache all filenames at startup

 util/path.c | 201 ++++++++++++----------------------------------------
 1 file changed, 47 insertions(+), 154 deletions(-)

-- 
2.17.1