README.md: update the readme to match the current state

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@@ -1,7 +1,3 @@
-![sandwich](https://cloud.githubusercontent.com/assets/13654546/9128676/a583cd0a-3c9a-11e5-9b4f-e03ab0ba37d7.png)
-
-Apologies to [Randall Monroe](http://www.xkcd.org/149/).
-
 # OpenDoas: a portable version of OpenBSD's `doas` command
 
 `doas` is a minimal replacement for the venerable `sudo`. It was
@@ -9,47 +5,41 @@ initially [written by Ted Unangst](http://www.tedunangst.com/flak/post/doas)
 of the OpenBSD project to provide 95% of the features of `sudo` with a
 fraction of the codebase.
 
-This is still a work in progress! Please do not deploy yet in a critical
-environment! Of note, `doas` semantics may yet change, and I haven't
-performed even a trivial security audit of my additions.
+At the moment only linux with GLIBC or musl libc is supported and tested.
 
 ## Building and installing
 
-Building `doas` should be just a simple `make` away.
-
-The included makefile also has an installation target. Installation
-requires root access to properly set the executable permissions. You'll
-also need to install a `doas.conf` file:
-
 ```
-make && sudo make install
-echo "permit :admin" | sudo tee /etc/doas.conf
+$ ./configure
+$ make
+# make install
 ```
 
-Oh the irony, using `sudo` to install `doas`!
-
 ## About the port
 
+This is not an official port/project from OpenBSD!
+
 As much as possible I've attempted to stick to `doas` as tedu desired
 it. As things stand it's essentially just code lifted from OpenBSD with
-PAM based authentication glommed on to it.
+PAM or shadow based authentication glommed on to it.
+
+Compatibility functions in libopenbsd come from openbsd directly
+(`strtonum.c`, `reallocarray.c`, `strlcpy.c`, `strlcat.c`),
+from openssh (`readpassphrase.c`) or from sudo (`closefrom.c`).
 
-I've used cvsync and git-cvsimport to retain the history of the core
-source files. I may choose to go back and do the same with some of the
-compatibility functions (such as reallocarray.c).
+The PAM and shadow authentication code does not come from the OpenBSD project.
 
-I have found it necessary to make some fixes to the codebase. One was
-a segfault due to differences in yacc/bison, others were just minor
-fixes to warnings. Once this appears stable, I may try to upstream some
-of these.
+### Perist/Timestamp/Timeout
 
-Currently, this is only tested on MacOSX 10.10 with Clang. My next goal
-is support for Fedora Linux as well. Contributions gladly accepted. ;-)
+The persist feature is disabled by default and can be enabled with the configure
+flag `--with-timestamp`.
 
-## Copyright
+This feature is new and potentially dangerous, in the original doas, a kernel API
+is used to set and clear timeouts. This API is openbsd specific and no similar API
+is available on other operating systems.
 
-All code from OpenBSD is licensed under the BSD license, please see
-individual files for details as the specific text varies from file to
-file.
+As a workaround, the persist feature is implemented using timestamp files
+similar to sudo.
 
-All code I've written is licensed with the 2-clause BSD.
+See the comment block in `timestamp.c` for an in-depth description on how
+timestamps are created and checked to be as safe as possible.