[PATCH 0/2] run-command: Add EACCES diagnostics

So here's a couple of patches that introduce some more elaborate investigation into what went wrong when receiving EACCES. This is probably something that could be expanded in the future, as running a command doesn't always produce equally obvious error messages.

"run-command: Add checks after execvp fails with EACCES" provides some basic checks on the permissions in PATH, and gives just a warning that none of its checks indicate a problem, so the user should check at least the interpreter permissions.

"run-command: Add interpreter permissions check" actually adds interpreter checking.

---

 run-command.c          |  172 ++++++++++++++++++++++++++++++++++++++++++++++++
 t/t0061-run-command.sh |   38 ++++++++++-
 2 files changed, 209 insertions(+), 1 deletions(-)