Implement scriptlet start and stop callbacks (RhBug:606239)

- Adds two new transaction callbacks: RPMCALLBACK_SCRIPT_START and
  RPMCALLBACK_SCRIPT_STOP which get issued for every scriptlet we run.
- On script start, callback can optionally return an FD which will
  override transaction-wide script fd to make it easier to accurately
  collect per-scriptlet output (eg per-scriptlet temporary file).
  Callback is also responsible for closing the fd if it returns one.
- For both callbacks, "amount" holds the script tag number. On stop
  callback, "total" holds the scriptlet exit status mapped into
  OK/NOTFOUND/FAIL for success/non-fatal/fatal errors. Abusing "notfound"
  for warning result is ugly but differentiating it from the other
  cases allows callers to ignore SCRIPT_ERROR if they choose to
  implement stop and start.

1 files changed, 2 insertions, 0 deletions

diff --git a/python/rpmmodule.c b/python/rpmmodule.c
index f2e0ed746..fdbb05ca5 100644
--- a/python/rpmmodule.c
+++ b/python/rpmmodule.c
@@ -449,6 +449,8 @@ static int initModule(PyObject *m)
     REGISTER_ENUM(RPMCALLBACK_UNPACK_ERROR);
     REGISTER_ENUM(RPMCALLBACK_CPIO_ERROR);
     REGISTER_ENUM(RPMCALLBACK_SCRIPT_ERROR);
+    REGISTER_ENUM(RPMCALLBACK_SCRIPT_START);
+    REGISTER_ENUM(RPMCALLBACK_SCRIPT_STOP);
 
     REGISTER_ENUM(RPMPROB_BADARCH);
     REGISTER_ENUM(RPMPROB_BADOS);