Rewrite prog stream support.

Two interfaces are provided: mu_prog_stream_create offers full control
over the program execution environment (i.e. running privileges, cwd,
resource limits) via a set of hints.
A simpler interface, mu_command_stream_create, runs the command in the
current environment.

mu_filter_prog_stream_create is removed, because its functionality can
be achieved by a correspondingly crafted set of hints to
mu_prog_stream_create.

* include/mailutils/prog.h: New file.
* include/mailutils/mailutils.h: Include mailutils/prog.h
* include/mailutils/Makefile.am (pkginclude_HEADERS): Add prog.h
* include/mailutils/stream.h (mu_prog_stream_create)
(mu_filter_prog_stream_create): Remove prototypes.
* include/mailutils/sys/prog_stream.h (_mu_prog_stream): Change structure.
(_mu_prog_limit_codes, _mu_prog_limit_flags): New externs.
* include/mailutils/util.h (mu_set_user_privileges)
(mu_switch_to_privs): New prototypes.

* lib/userprivs.c: Move to libmailutils/base.
* lib/Makefile.am (libmuaux_a_SOURCES): Remove userprivs.c
* libmailutils/base/Makefile.am (libbase_la_SOURCES): Add userprivs.c
* libmailutils/base/userprivs.c (mu_set_user_privileges): New function.
(mu_switch_to_privs): Rewrite as another entry point to mu_set_user_privileges.

* libmailutils/stream/prog_stream.c (_mu_prog_limit_flags)
(_mu_prog_limit_codes): New global variables.
(start_program_filter): Use hints to control execution environment.
(_prog_stream_create): Save hints.
(mu_prog_stream_create): Change signature.
(mu_command_stream_create): New function (corresponds to the prior
mu_prog_stream_create).
(mu_filter_prog_stream_create): Remove function.
* comsat/action.c (action_exec): Use new mu_prog_stream_create calling
convention.
* examples/murun.c: Rewrite.

* mh/mhn.c (show_internal): Use new mu_prog_stream_create calling
convention.
* mh/tests/mhn.at: Reflect changes to mhn.

* imap4d/preauth.c: Use mu_command_stream_create.
* libmu_sieve/extensions/pipe.c
* mail/decode.c
* mail/pipe.c
* mail/send.c
* mh/mhl.c
* mu/shell.c

* mail/mail.h: Include mailutils/prog.h
* mh/mh.h

* po/POTFILES.in: Add libmailutils/base/userprivs.c.

1 files changed, 1 insertions, 1 deletions

diff --git a/mu/shell.c b/mu/shell.c
index 76bd2c604..45e3797b3 100644
--- a/mu/shell.c
+++ b/mu/shell.c
@@ -240,7 +240,7 @@ mutool_open_pager ()
   if (mutool_shell_interactive && (pager = getenv ("PAGER")) != NULL)
     {
       mu_stream_t stream;
-      int rc = mu_prog_stream_create (&stream, pager, MU_STREAM_WRITE);
+      int rc = mu_command_stream_create (&stream, pager, MU_STREAM_WRITE);
       if (rc == 0)
 	return stream;
       mu_error (_("cannot start pager: %s"), mu_strerror (rc));