uppercase characters in model names cause problems with the build system, so they are forbidden for most commands.

If models are already started when requested to start, there's no need to check. Systemd won't mind another request to start.
Removing these checks allows the user to specify a list of models to start, stop or restart, and not have to worry if some of them are already
in the requested state.

START_DELAY can be set to any value of seconds to change the default 15 second
delay after each model is started.  If the startup sequencer is used, the delay can be set to 1 second.

previously 'rtcds restart --all' would not restart the IOP model, since the kernel was unable to unload hte module before it was ordered to load it again.
Now, stopping a model waits until the kernel module is unloaded.

rtcds: added end-of-word check to status scan of lsmod for model names.  Fix had previously been applied to other system models

The default build can still be set back to user space by setting
USE_KERNEL_MODELS=false
in the environment.

rtcds: read in environment before setting flags and change flag tests to explictly look for non-empty strings.

The entire block of code for initializing environment variables has been moved before the command line flag checks.
The USERLAND_FLAG and NO_KERNELSPACE_FLAG default values are determined by the environment, but the /etc/advligorts files need to be read in first.

Command line flags are cleared if empty string, or set if not empty.  This wasn't obvious originally since the test for flags was
just [[ $SOME_FLAG ]].

The tests have been changed to [[ -n $SOME_FLAG ]] or in the negative case [[ -z $SOME_FLAG ]].
This doesn't change the behavior but is less ambigous to the eye.

rtcds: refactor epics-only tests.  get_model_unit now produces the right unit_name for a given model name

local_dc: get rid of wanted by in systemd unit file.  Start of local_dc now sequenced by a systemd generator.  Also, this will stop the default behavior of starting local_dc on systems that don't need it.

systemd_generator: moved to src/python/cds_frontend.  Will make it into a more generic front end control library.

This is to protect these critical processes in the FE system to make sure they do not get starved for CPU if there are other processes monopolizing the processor.

Remove old # of files, # of dirs directives.
Update the default prefix for epics.

rtcds status improved to not look for dolphin on non-dolphin hosts.  Hosts must have IS_DOLPHIN_NODE=true for rtcds to check dolphin modules etc.
Likewise, rtcds will not check streamers and local DC if there there is no DAQ streaming.  Set DAQ_STREAMING=true to force rtcds to check streamers.

This makes awgtpman fail if the module service is not loaded, but does systemd will not attempt to start the module.

Previously if the module failed, awgtpman would eventually restart, triggering a restart of the whole model.  This would lead to cluttered logs full of errors from each restart.
This chang fixes that issue.

Fixed build_edc_ini to add newline at end of ini file if not present.  Also added some simple tests for build_edc_ini.

rtcds: added orthagonal commandline flags for choosing kernel or user space model building.  Default is user space, but can be changed by setting USE_KERNEL_MODELS to true.

new argument system for rtcds now works well.  Tested all commands.  --userland flag added but does not yet do anything."
"

Erik von Reis authored 4 years ago and Jameson Rollins committed 4 years ago

rtcds lsmod now checks local_dc and cps_xmit processes. Also checks all dolphin modules. Closes #122

rtcds start and stop no longer require a model to be enabled, since we don't use "enabled" systemd units to start models at boot. Instead rtcds start and rtcds stop check to see if the model is active or not.

rtcds start now has a sleep between starts. This puts a gap between IOP starts and user model starts, sidestepping a race condition.

Also ignores errors when building every model, allowing for expected errors such as channels missing from the channels file. Closes #134

Enable now controled by environmental option ALLOW_MODEL_ENABLE.  When false, rtcd enable commands cannot be issued.

Changed start to sleep for 15 seconds between model starts.  Close timing was causing timing glitches in IOP.
Changed build --all to ignore error so that it can build all the way through on the first build (no channels in channel file)

 * fix the systemd unit to use the corect argument for the listen interface 'l' instead of 'I'
 * convert the standalone_edc to use the args library, and update the documentation
 * add a '_daq' to the end of the edc's mbuf name, so that it is similar to the models
   * Note this is transparent to the user, the '_daq' should not be added on (either to the name passed into the edc or to local_dc)
 * Updated the edc test to not specify '_daq' anywhere.

Done for:
 * daqd
 * nds
 * local_dc
 * edc

For some reason the systemd unit parsing does not pick up the
STATE_DIRECTORY environment variable, so we have to expand manually.