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lpc-scripts

scripts of use on the cmslpc cluster

call_host.sh

Many commands are installed on interactive nodes but are not accessible inside containers.

The script call_host.sh enables calling these commands on the host node from inside a container.

This is particularly useful for HTCondor commands and EOS commands, among others.

Support is currently guaranteed for the cmslpc cluster at Fermilab, and the CMS Connect and OSG clusters hosted at UChicago. This script may also work on other clusters, such as lxplus at CERN.

Note

The examples here use the cmssw-el7 command. This is a wrapper around Apptainer for CMS-specific use.

For non-CMS use, replace this command with your usual Apptainer command, e.g.:

apptainer exec ... /bin/bash

Usage

These instructions assume that you have cloned lpc-scripts in your home area:

cd ~
git clone https://github.com/FNALLPC/lpc-scripts

Manual

  1. Before entering the container:

    source ~/lpc-scripts/call_host.sh

  2. Then enter the container:

    cmssw-el7

  3. Inside the container:

    source ~/lpc-scripts/call_host.sh

Steps 2 and 3 can be combined: bash cmssw-el7 -- 'source ~/lpc-scripts/call_host.sh && /bin/bash'

Automatic

Whenever you edit your .bashrc or .bash_profile, you should log out and log back in for the changes to take effect.

  1. In your .bashrc or .bash_profile:

    source ~/lpc-scripts/call_host.sh
    • To check if this line in your .bashrc or .bash_profile is being executed when you log in, make sure the following command shows some output: 
       echo $APPTAINERENV_APPTAINER_ORIG

  2. To start a container with this in your .bashrc:

    cmssw-el7 [options] -- /bin/bash

    or to start a container with this in your .bash_profile:

    cmssw-el7 [options] -- /bin/bash -l

There are many possible permutations of bash login scripts. If the above options are not working properly for you, you can fall back to the "Manual" approach above.

Details

What happens:

  • The apptainer command is replaced with a function that will create a set of pipes on the host node before running apptainer.
  • Inside the container, all executables starting with condor_ and eos will automatically run on the host node.
  • To run other commands on the host node, use call_host cmd, where cmd is the command you want to run (with any arguments).
  • Nested containers are supported (the enable/disable status (see "Options" just below) is inherited from the top-level container and cannot be changed)

Options

The export lines below can be executed manually, placed in your .bashrc or .bash_profile, or placed in a file ~/.callhostrc (automatically detected and sourced by call_host.sh).

  • Before sourcing the script, you can use this line to change the directory where the pipes will be created: 
    export CALL_HOST_DIR=your_dir
    The default directory for cmslpc is ~/nobackup/pipes, and for CMS connect / OSG is /scratch/`whoami`/pipes. For other clusters, you must specify the directory (no other programmed defaults are currently provided).
  • If you want to run additional executables or functions automatically on the host node, you can add a line like this with a space-separated list (replace the example commands with the commands you want): 
    export CALL_HOST_USERFNS="display gs"
  • If you want to disable this by default and only enable it on the fly, use the following syntax (which sets the variable value to disable only if it is currently unset, in order to facilitate temporary enabling): 
    export CALL_HOST_STATUS=${CALL_HOST_STATUS:=disable}
    Use the dedicated toggle to enable it for the rest of your session (or until another toggle is called): 
    call_host_enable
    or just enable it for one container invocation: 
    CALL_HOST_STATUS=enable cmssw-el7 ...
  • Instead, if you have this enabled by default and want to disable it on the fly:
    Use the dedicated toggle to disable it for the rest of your session (or until another toggle is called): 
    call_host_disable
    or just disable it for one container invocation: 
    CALL_HOST_STATUS=disable cmssw-el7 ...

Caveats

  • cmslpc autodetection of the correct operating system for jobs is currently based on the host OS. Therefore, if you are submitting jobs in a container with a different OS, you will have to manually specify in your JDL file (the X in condor_submit X): 
    +DesiredOS = SL7
    (other possible values are EL8 or EL9)
  • If you are running in a non-CMS container, then you should manually set a different line in your JDL file: 
    +ApptainerImage = "/path/to/your/container"
  • Using the ENV() function in the JDL file may not function as intended, since it will be evaluated on the host node, rather than inside the container with your environment set up.
  • Commands that require tty input (such as nano or emacs -nw) will not work with call_host.
  • Calling multiple commands at once with call_host can break the pipe if the commands are separated by semicolons and a non-final command fails. The symptom of this will be that subsequent host commands hang, and pressing ctrl+C will give the error message "Interrupted system call". It is necessary to exit and reenter the container (in order to create a new pipe) if this occurs. To avoid this, chain multiple commands using logical operators (&& or ||), or surround all the commands in () (thereby running them in a subshell).
  • Stopping a command in progress with ctrl+C will also break the pipe (as described in the previous item).

bind_condor.sh

It is also possible to use the HTCondor Python bindings inside a container. This requires correctly specifying the HTCondor configuration. A simple approach is provided in bind_condor.sh.

Usage

In your .bashrc:

source bind_condor.sh

That's it!

Setting up bindings

You will also need to have the HTCondor Python bindings installed in your working environment.

For newer CMSSW versions, the installation procedure is simple:

cmsrel CMSSW_X_Y_Z
cd CMSSW_X_Y_Z/src
cmsenv
scram-venv
cmsenv
pip3 install htcondor

(Click here to learn more about scram-venv)

For CMSSW_10_6_X, the Run 2 ultra-legacy analysis release that is only available for EL7 operating systems, there are some extra steps:

cmsrel CMSSW_10_6_30
cd CMSSW_10_6_30/src
cmsenv
scram-venv
cmsenv
pip3 install --upgrade pip
cmsenv
pip3 install --upgrade htcondor==10.3.0

In this particular case, it is necessary to upgrade pip and install a specific version of the bindings because the Python version in CMSSW_10_6_X is old (Python 3.6.4).

NOTE: These recipes only install the bindings for Python3. (Python2 was still the default in CMSSW_10_6_X.) You will need to make sure any scripts using the bindings are compatible with Python3.

Unit and Integration testing

Automated

Some automated linting for both Python and Bash takes place using GitHub Actions. This testing is run on both pushes and pull requests. The jobs use pylint to check the Python code and ShellCheck to do the static checking of the Bash scripts.

Manual

Much of the code contained here relies on certain mounts (i.e. cvmfs), specific disk systems (eos), or specially installed software (i.e. voms-proxy-init). The codes which rely on these can't be easily tested using automated GitHub Actions jobs. Below you will find some directions on how to manually test the code.

Please note, these tests do not constitute complete coverage. Some additional manual testing may be necessary.

Bats for Bash scripts

The Bats tests are currently setup to test only the eosdu executable. Every effort has been made to test all of the options. Even so, full coverage is not guaranteed. These tests rely on the eos path /store/user/cmsdas/test/ being stable.

First the Bats software needs to be setup. This is a process that only needs to happen once. To setup the software run the following command from within the <path to lpc-scripts>/lpc-scripts directory:

./test/bats_control.sh -s

Once the software is setup, you can run the tests using:

./test/bats_control.sh

If everything is working correctly, the output will be:

 ✓ Check eosdu basic
 ✓ Check eosdu usage message
 ✓ Check eosdu file count
 ✓ Check eosdu human readable
 ✓ Check eosdu recursive
 ✓ Check eosdu human readable bibytes
 ✓ Check eosdu human readable file count
 ✓ Check eosdu recursive human readable
 ✓ Check eosdu recursive file count
 ✓ Check eosdu recursive human readable file count
 ✓ Check eosdu grep
 ✓ Check eosdu human readable grep
 ✓ Check eosdu file count grep
 ✓ Check eosdu human readable file count grep

14 tests, 0 failures

To remove the Bats software run:

./test/bats_control.sh -r

Pytest for Python modules

To run the python unit/integration tests, you will need to have pytest installed. Currently the version of pytest in CMSSW_12_1_0_pre3 does not work and there is no pytest module installed on the cmslpc host machines. To create a local virtual environment with pytest installed, use the following commands from within the <path to lpc-scripts>/lpc-scripts directory:

./test/pytest_control.sh -s

You only have to run that command when setting up the virtual environment the first time. You can then run the tests by using the command:

./test/pytest_control.sh

You should see an output similar to:

========================================================== test session starts ===========================================================
platform linux -- Python 3.6.8, pytest-6.2.5, py-1.10.0, pluggy-1.0.0
rootdir: <path to lpc-scripts>
collected 7 items

test/test.py s......                                                                                                               [100%]

====================================================== 6 passed, 1 skipped in 5.74s ======================================================

You can pass addition options to pytest using the -o flag. For example, you could run the following command to increase the verbosity of pytest:

./test/pytest_control.sh -o '--verbosity=3'

Other helpful pytest options include:

  • -rp: To see the output of successful tests. This is necessary because by default all of the output from the various tests is captured by pytest.
  • -rx: To see the output of failed tests (default).

To remove the virtual environment use the command:

./test/pytest_control.sh -r

which will simply remove the test/venv directory.