[PATCH 0/2] run-command: fix Unix PATH lookup

This series fixes a bug where run-command.c accidentally runs commands from the current directory when they are not found in the $PATH.

The second patch is the interesting one. The first one is just a necessary cleanup. Possibly this should be split into two topics: the second patch slated for maint, and then the first one as an independent fixup on tb/filter-alternate-refs (which is in master).

  [1/2]: t5410: use longer path for sample script
  [2/2]: run-command: mark path lookup errors with ENOENT

 run-command.c                      | 20 ++++++++++++++++----
 t/t0061-run-command.sh             | 13 ++++++++++++-
 t/t5410-receive-pack-alternates.sh |  2 +-
 3 files changed, 29 insertions(+), 6 deletions(-)

-Peff