Fuego Developer Notes

This page has some detailed notes about Fuego, Jenkins and how they interact.

Resources

Here are some pages in this wiki with developer information:

  • Coding style

  • Core_interfaces

  • Glossary

  • Fuego test results determination

  • Fuego_naming_rules

  • Fuego Object Details

  • Integration with ttc

  • Jenkins User Interface

  • Jenkins Plugins

  • License And Contribution Policy

  • Log files

  • Metrics

  • Overlay Generation

  • ovgen feature notes

  • Parser module API

  • Test Script APIs

  • Test package system

  • Test server system

  • Transport notes

  • Variables

Notes

specific questions to answer

What happens when you click on the “run test” button:

  • what processes start on the host

    • java - jar /home/jenkins/slave.jar, executing a shell running the contents of the job.xml “hudson.tasks.Shell/command” block:

      • this block is labeled: “Execute shell: Command” in the “Build” section of the job, in the configure page for the job in the Jenkins user interface.

  • what interface is used between the executing test (ultimately a bash shell script) and the jenkins processes

Each Jenkins node is defined in Jenkins in:/var/lib/jenkins/nodes/config.xml

  • The name of the node is used as the “Device” and “NODE_NAME” for a test.

    • These environment variables are passed to the test agent, which is always “java -jar /home/jenkins/slave.jar”

  • Who calls ovgen.py? The core does, at the very start of main.sh via the call to set_overlay_vars (which is in overlays.sh:w

Jenkins calls:

  • java -jar /fuego-core/slave.jar

    • with variables:

      • Device

      • Reboot

      • Rebuild

      • Target_PreCleanup

      • Target_PostCleanup

      • TESTDIR

      • TESTNAME

      • TESTSPEC

      • FUEGO_DEBUG

  • the “Test Run” section of the Jenkins job for a test has a shell script fragment with the following shell commands:

    #logging areas=pre_test,pre_check,build,makepkg,deploy,snapshot,run,
    #    post_test,processing, parser,criteria,charting
    #logging levels=debug,verbose,info,warning,error
    #export FUEGO_LOGLEVELS="run:debug,parser:verbose"
    export FUEGO_CALLER="jenkins"
    ftc run-test -b $NODE_NAME -t Functional.hello_world -s default \
        --timeout 6m \
        --reboot false \
        --rebuild false \
        --precleanup true \
        --postcleanup true
    

Some Jenkins notes:

Jenkins stores its configuration in plain files under JENKINS_HOME You can edit the data in these files using the web interface, or from the command line using manual editing (and have the changes take affect at runtime by selecting “Reload configuration from disk”.

By default, Jenkins assumes you are doing a continuous integration action of “build the product, then test the product”. It has default support for Java projects.

Fuego seems to use distributed builds (configured in a master/slave fashion).

Jenkins home has (from 2007 docs):

  • config.xml - has stuff for the main user interface

  • *.xml

  • fingerprints - directory for artifact fingerprints

  • jobs

    • <JOBNAME>

      • config.xml

      • workspace

      • latest

      • builds

        • <ID>

        • build.xml

        • log

        • changelog.xml

The docker container interfaces to the outside host filesystem via the following links:

  • /fuego-ro -> <host-fuego-location>/fuego-ro

  • /fuego-rw -> <host-fuego-location>/fuego-rw

  • /fuego-core -> <host-fuego-core-location>

What are all the fields in the “configure node” dialog: Specifically:

  • where is “Description” used? - don’t know

  • what is “# of executors”? - don’t know for sure

  • how is “Remote root directory” used?

    • this is a path inside the Fuego container. I’m not sure what Jenkins uses it for.

  • what are Labels used for?

    • as tags for grouping builds

  • Launch method: Fuego uses the Jenkins option “Launch slave via execution of command on the Master” The command is “java -jar /fuego-core/slave.jar”

    • NOTE: slave.jar comes from fuego-core git repository, under slave.jar

The fuego-core directory structure is:

overlays - has the base classes for fuego functions
  base - has core shell functions
  testplans - has json files for parameter specifications (deprecated)
  distribs - has shell functions related to the distro
scripts - has fuego scripts and programs
 (things like overlays.sh, loggen.py, parser/common.py, ovgen.py, etc.
slave.jar - java program that Jenkins calls to execute a test
tests - has a directory for each test
  Benchmark.foo
    Benchmark.foo.spec
    foo.sh
    test.yaml
    reference.log
    parser.py
  Functional.bar
  LTP
  etc.

What is groovy:

  • an interpreted language for Java, used by the scriptler plugin to extend Jenkins

What plugins are installed with Jenkins in the JTA configuration?

  • Jenkins Mailer, LDPA, External Monitor Job Type, PAM, Ant, Javadoc

  • Jenkins Environment File (special)

  • Credentials, SSH Credentials, Jenkins SSH Slags, SSH Agent

  • Git Client, Subversion, Token Macro, Maven Integration, CVS

  • Parameterized Trigger (special)

  • Git, Groovy Label Assignment Extended Choie Parameter

  • Rebuilder…

  • Groovy Postbuild, ez-templates, HTML Publisher (special)

  • JTA Benchmark show plot plugin (special)

  • Log Parser Plugin (special)

  • Dashboard view (special)

  • Compact Columns (special)

  • Jenkins Dynamic Parameter (special)

  • flot (special) - benchmark graphs plotting plug-in for Fuego

Which of these did Cogent write?

  • the flot plugin (not flot itself)

What scriptler scripts are included in JTA?

  • getTargets

  • getTestplans

  • getTests

What language are scriptler scripts in?

  • Groovy

What is the Maven plugin for Jenkins?

  • Maven is an apache project to build and manage Java projects

    • I don’t think the plugin is needed for Fuego

Jenkins refers to a “slave” - what does this mean?

  • it refers to a sub-process that can be delegated work. Roughly speaking, Fuego uses the term ‘target’ instead of ‘slave’, and modifies the Jenkins interface to support this.

How the tests work

A simple test that requires no building is Functional.bc

  • the test script and test program source are found in the directory: /home/jenkins/tests/Functional.bc

This runs a shell script on target to test the ‘bc’ program.

Functional.bc has the files:

bc-script.sh
   declares "tarball=bc-script.tar.gz"
   defines shell functions:
     test_build - calls 'echo' (does nothing)
     test_deploy - calls 'put bc-device.sh'
     test_run - calls 'assert_define', 'report'
       report references bc-device.sh
     test_processing - calls 'log_compare'
       looking for "OK"
   sources $JTA_SCRIPTS_PATH/functional.sh
 bc-script.tar.gz
   bc-script/bc-device.sh

Variables used (in bc-script.sh):

BOARD_TESTDIR
TESTDIR
FUNCTIONAL_BC_EXPR
FUNCTIONAL_BC_RESULT
A simple test that requires simple building:

Functional.synctest

This test tries to call fsync to write data to a file, but is interupted with a kill command during the fsync(). If the child dies before the fsync() completes, it is considered success.

It requires shared memory (shmget, shmat) and semaphore IPC (semget and semctl) support in the kernel.

Functional synctest has the files:

synctest.sh
  declares "tarball=synctest.tar.gz"
  defines shell functions:
    test_build - calls 'make'
    test_deploy - calls 'put'
    test_run - calls 'assert_define', hd_test_mount_prepare, and 'report'
    test_processing - calls 'log_compare'
      looking for "PASS : sync interrupted"
  sources $JTA_SCRIPTS_PATH/functional.sh
synctest.tar.gz
  synctest/synctest.c
  synctest/Makefile
synctest_p.log
  has "PASS : sync interrupted"

Variables used (by synctest.sh)

CFLAGS
LDFLAGS
CC
LD
BOARD_TESTDIR
TESTDIR
FUNCTIONAL_SYNCTEST_MOUNT_BLOCKDEV
FUNCTIONAL_SYNCTEST_MOUNT_POINT
FUNCTIONAL_SYNCTEST_LEN
FUNCTIONAL_SYNCTEST_LOOP

Note

could be improved by checking for CONFIG_SYSVIPC in /proc/config.gz to verify that the required kernel features are present

MOUNT_BLOCKDEV and MOUNT_POINT are used by ‘hd_test_mount_prepare’ but are prefaced with FUNCTIONAL_SYNCTEST or BENCHMARK_BONNIE

from clicking “Run Test”, to executing code on the target… config.xml has the slave command: /home/jenkins/slave.jar -> which is a link to /home/jenkins/jta/engine/slave.jar

overlays.sh has “run_python $OF_OVGEN …” where OF_OVGEN is set to “$JTA_SCRIPTS_PATH/ovgen/ovgen.py”

How is overlays.sh called?
it is sourced by /home/jenkins/scripts/benchmarks.sh and

/home/jenkins/scripts/functional.sh

functional.sh is sourced by each Funcational.foo script.

For Functional.synctest:

Functional.synctest/config.xml
  for the attribute <hudson.tasks.Shell> (in <builders>)
    <command>....
      souce $JTA_TESTS_PATH/$JOB_NAME/synctest.sh</command>

synctest.sh
  '. $JTA_SCRIPTS_PATH/functional.sh'
     'source $JTA_SCRIPTS_PATH/overlays.sh'
     'set_overlay_vars'
         (in overlays.sh)
         run_python $OF_OVGEN ($JTA_SCRIPTS_PATH/ovgen/ovgen.py) ...
                $OF_OUTPUT_FILE ($JTA_SCRIPTS_PATH/work/${NODE_NAME}_prolog.sh)
           generate xxx_prolog.sh
         SOURCE xxx_prolog.sh

     functions.sh pre_test()

     functions.sh build()
        ... test_build()

     functions.sh deploy()

     test_run()
       assert_define()
       functions.sh report()

NOTES about ovgen.py

What does this program do?

Here is a sample command line from a test console output:

python /home/jenkins/scripts/ovgen/ovgen.py \
  --classdir /home/jenkins/overlays//base \
  --ovfiles /home/jenkins/overlays//distribs/nologger.dist /home/jenkins/overlays//boards/bbb.board \
  --testplan /home/jenkins/overlays//testplans/testplan_default.json \
  --specdir /home/jenkins/overlays//test_specs/ \
  --output /home/jenkins/work/bbb_prolog.sh

So, ovgen.py takes a classdir, a list of ovfiles a testplan and a specdir, and produces a xxx_prolog.sh file, which is then sourced by the main test script

Here is information about ovgen.py source:

Classes:
 OFClass
 OFLayer
 TestSpecs
Functions:
 parseOFVars - parse Overlay Framework variables and definitions
 parseVars - parse variables definitions
 parseFunctionBodyName
 parseFunction
 baseParseFunction
 parseBaseFile
 parseBaseDir
 parseInherit
 parseInclude
 parseLayerVarOverride
 parseLayerFuncOverride
 parseLayerVarDefinition
 parseLayerCapList - look for BOARD.CAP_LIST
 parseOverrideFile
 generateProlog
 generateSpec
 parseGenTestPlan
 parseSpec
 parseSpecDir
 run

Sample generated test script

bbb_prolog.sh is 195 lines, and has the following vars and functions:

from class:base-distrib:
  ov_get_firmware()
  ov_rootfs_kill()
  ov_rootfs_drop_caches()
  ov_rootfs_oom()
  ov_rootfs_sync()
  ov_rootfs_reboot()
  ov_rootfs_state()
  ov_logger()
  ov_rootfs_logread()

from class:base-board:
 LTP_OPEN_POSIX_SUBTEST_COUNT_POS
 MMC_DEV
 SRV_IP
 SATA_DEV
 ...
 JTA_HOME
 IPADDR
 PLATFORM=""
 LOGIN
 PASSWORD
 TRANSPORT
 ov_transport_cmd()
 ov_transport_put()
 ov_transport_get()

from class:base-params:
 DEVICE
 PATH
 SSH
 SCP

from class:base-funcs:
 default_target_route_setup()

from testplan:default:
 BENCHMARK_DHRYSTONE_LOOPS
 BENCHMARK_<TESTNAME>_<VARNAME>
 ...
 FUNCTIONAL_<TESTNAME>_<VARNAME>

Logs

When a test is executed, several different kinds of logs are generated: devlog, systemlogs, the testlogs, and the console log.

created by Jenkins

  • console log

    • this is located in /var/lib/jenkins/jobs/<test_name>/builds/<build_id>/log

    • is has the output from running the test script (on the host)

created by ftc

  • console log

    • if ‘ftc’ was used to run the test, then the console log is created in the log directory, which is: /fuego-rw/logs/<test_name>/<board>.<spec>.<build_id>.<build_number>/

    • it is called consolelog.txt

created by the test script

  • these are created in the directory: /fuego-rw/logs/<test_name>/<board>.<spec>.<build_id>.<build_number>/

  • devlog has a list of commands run on the board during the test

    • named devlog.txt

  • system logs have the log data from the board (e.g. /var/log/messages) before and after the test run:

    • named: syslog.before.txt and syslog.after.txt

  • the test logs have the actual output from the test program on the target

    • this is completely dependent on what the test program outputs

    • named: testlog.txt

      • this is the ‘raw’ log

    • there may be ‘parsed’ logs, which is the log filtered by log_compare operations:

      • this is named: testlog.p.txt or testlog.n.txt

      • the ‘p’ indicated positive results and the ‘n’ indicates negative results

Core scripts

The test script is sourced by the Fuego main.sh script

This script sources several other scripts, and ends up including fuego_test.sh

  • load overlays and set_overlay vars

  • pre_test $TEST_DIR

  • build

  • deploy

  • test_run

  • set_testres_file, bench_processing, check_create_logrun (if a benchmark)

  • get_testlog $TESTDIR, test_processing (if a functional test)

  • get_testlog $TESTDIR (if a stress test)

  • test_processing (if a regular test)

functions available to test scripts: See Test Script APIs

Benchmark tests must provide a parser.py file, which extracts the benchmark results from the log data.

It does this by doing the following:

import common as plib
f = open(plib.TEST_LOG)
lines = f.readlines()
((parse the data))

This creates a dictionary with a key and value, where the key matches the string in the reference.log file

The parser.py program builds a dictionary of values by parsing the log from the test (basically the test output). It then sends the dictionary, and the pattern for matching the reference log test criteria to the routine: common.py:process_data()

It defines ref_section_pat, and passes that to process_data() Here are the different patterns for ref_section_pat:

9  "\[[\w]+.[gle]{2}\]"
1  "\[\w*.[gle]{2}\]"
1  "^\[[\d\w_ .]+.[gle]{2}\]"
1  "^\[[\d\w_.-]+.[gle]{2}\]"
1  "^\[[\w\d&._/()]+.[gle]{2}\]"
4  "^\[[\w\d._]+.[gle]{2}\]"
2  "^\[[\w\d\s_.-]+.[gle]{2}\]"
3  "^\[[\w\d_ ./]+.[gle]{2}\]"
5  "^\[[\w\d_ .]+.[gle]{2}\]"
1  "^\[[\w\d_\- .]+.[gle]{2}\]"
1  "^\[[\w]+.[gle]{2}\]"
1  "^\[[\w_ .]+.[gle]{2}\]"

Why are so many different ones needed?? Why couldn’t the syntax be: <var-name> <test> <value> on one line?

It turns out this is processed by an ‘awk’ script. thus the weird syntax. We should get rid of the awk script and use python instead.

How is benchmarking graphing done?

See Benchmark parser note

docker tips

See Docker Tips