Git show untracked stash files

Git stash can save untracked files like this:

git stash --all

But to see untracked files in the stash you need this special ^3 syntax:

git show stash@{1}^3

git show stash@{2}^3

git show stash@{99}^3

This shows stash numbers, 1, 2 and 99 respectively. The number 3 always remains 3.

(source)

Jenkins email notifications

The default Jenkins email notifications are almost unusable, they contain a complete output of the build log. How to set up custom notifications:

• Install this plugin: https://wiki.jenkins-ci.org/display/JENKINS/Email-ext+plugin
• Configure a Jenkins job, scroll to the bottom and click "Add post-build action", then select "Editable email notification"
• Example email design:

Subject: [CI] Nightly "master" test results - Build #${BUILD_NUMBER} - ${BUILD_STATUS}

Body:

Nightly master tests

Test run #${BUILD_NUMBER} for "${PROJECT_DISPLAY_NAME}"

Links: (1) details of successes/failures, (2) full console output, (3) latest commits to master

Summary

Result: ${BUILD_STATUS} - ${TEST_COUNTS, var="fail"} failures

${TEST_COUNTS, var="pass"} out of ${TEST_COUNTS, var="total"} tests passed (${TEST_COUNTS, var="skip"} skipped).

Details

${FAILED_TESTS, showStack=false, showMessage=false}

Elasticsearch basics

Warning: Your Elasticsearch / ELK stack based logging solution may take a huge amount of disk space, and indexing of large amounts of data may also take so long that it can't keep up with the logs being generated.

In short, you need massive/cluster/cloud resources to support Elasticsearch.

Search:

curl '{endpoint}/_search?q=title:jones&size=5&pretty=true'

List indexes:

curl -s '{endpoint}/_cat/indices?v' | sort

Upload a template:

curl -X POST -H "Content-Type: application/json" -d @path/to/template.json 'http://elastic:changeme@localhost:9200/_template/testlog?pretty'

Add a document:

curl -X POST -H "Content-Type: application/json" -d '{ "timestamp": "2019-04-06T14:13:31", "message": "bar baz qux" }' http://elastic:changeme@localhost:9200/testlog/footype?pretty

Range query:

curl -X GET -H "Content-Type: application/json" -d '{ "query": { "range" : { "timestamp" : { "gte" : "2019-04-02T15:13:31", "lte" : "2019-05-09T14:13:31", "boost" : 2.0 } } } }' http://elastic:changeme@localhost:9200/testlog/_search?pretty

Git: diff branch against master

Compare feature branch changes with upstream:

git diff $( git merge-base master HEAD )

Thanks Bill!

Surprising behaviour of the perl debugger for wantarray()

When you are running a perl script in the debugger, do not expect wantarray() to return the same thing it would if not running in the debugger.

If you break execution at a breakpoint, wantarray() seems to return 1 when it wouldn't otherwise.