I'm using the Gerrit Trigger Plugin to kick off Jenkins builds, but haven't found a good place where all of the environment variables are documented. Does such documentation exist?
6 Answers
As a start, I had a Jenkins build shell script dump all environment variables with GERRIT
in the name:
GERRIT_PATCHSET_UPLOADER=\"Alan Thompson\" <theEmail@gmail.com>
GERRIT_PATCHSET_REVISION=eec3b0b65fcdf30872befa2e9ace06e96cd487b4
GERRIT_CHANGE_ID=Ieec3b0b65fcdf30872befa2e9ace06e96cd487b4
GERRIT_PATCHSET_NUMBER=1
GERRIT_EVENT_ACCOUNT_EMAIL=theEmail@gmail.com
GERRIT_CHANGE_NUMBER=8
GERRIT_CHANGE_OWNER=\"Alan Thompson\" <theEmail@gmail.com>
GERRIT_REFSPEC=refs/changes/08/8/1
GERRIT_EVENT_TYPE=change-merged
GERRIT_EVENT_ACCOUNT=\"Alan Thompson\" <theEmail@gmail.com>
GERRIT_CHANGE_SUBJECT=toast: this is great with coffee
GERRIT_CHANGE_OWNER_NAME=Alan Thompson
GERRIT_PROJECT=kitchen
GERRIT_EVENT_HASH=-1357519550
GERRIT_BRANCH=master
GERRIT_CHANGE_OWNER_EMAIL=theEmail@gmail.com
GERRIT_PATCHSET_UPLOADER_EMAIL=theEmail@gmail.com
GERRIT_CHANGE_URL=http://localhost/8
GERRIT_PATCHSET_UPLOADER_NAME=Alan Thompson
GERRIT_EVENT_ACCOUNT_NAME=Alan Thompson

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What did you use to get the output? When I try to list all the environmental variables of the Jenkins process (from /proc/pid/environ) i don't get those. – TheMeaningfulEngineer Jul 15 '13 at 14:34
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4@Alan Likely just a simple execute shell build operation that does `env | grep '^GERRIT'` or similar. – ffledgling Aug 08 '16 at 08:19
The exact answer can be found in the source here and there is at least some source code comments describing what it means.

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Thank your for your share. I find the GerritTriggerParameters.java on GitHub. and I write the shell-script to print the gerrit-trigger variables.
#!/bin/bash
# ============================================================
# Author: 凍仁翔 / chusiang.lai (at) gmail.com
# Blog: http://note.drx.tw
# Filename: showGerritTriggerVar.sh
# Description: show all variables of Gerrit Trigger.
# Last modified: 2014-08-28 14:40
# ===========================================================
echo -e "----
# Parameter name for the commit subject (commit message's 1st line).
\$GERRIT_CHANGE_SUBJECT = ${GERRIT_CHANGE_SUBJECT}
# Parameter name for the full commit message.
\$GERRIT_CHANGE_COMMIT_MESSAGE = ${GERRIT_CHANGE_COMMIT_MESSAGE}
# Parameter name for the branch.
\$GERRIT_BRANCH = ${GERRIT_BRANCH}
# Parameter name for the topic.
\$GERRIT_TOPIC = ${GERRIT_TOPIC}
# Parameter name for the change-id.
\$GERRIT_CHANGE_ID = ${GERRIT_CHANGE_ID}
# Parameter name for the change number.
\$GERRIT_CHANGE_NUMBER = ${GERRIT_CHANGE_NUMBER}
# Parameter name for the URL to the change.
\$GERRIT_CHANGE_URL = ${GERRIT_CHANGE_URL}
# Parameter name for the patch set number.
\$GERRIT_PATCHSET_NUMBER = ${GERRIT_PATCHSET_NUMBER}
# Parameter name for the patch set revision.
\$GERRIT_PATCHSET_REVISION = ${GERRIT_PATCHSET_REVISION}
# Parameter name for the Gerrit project name.
\$GERRIT_PROJECT = ${GERRIT_PROJECT}
# Parameter name for the refspec.
\$GERRIT_REFSPEC = ${GERRIT_REFSPEC}
# The name and email of the abandoner of the change.
\$GERRIT_CHANGE_ABANDONER = ${GERRIT_CHANGE_ABANDONER}
# The name of the abandoner of the change.
\$GERRIT_CHANGE_ABANDONER_NAME = ${GERRIT_CHANGE_ABANDONER_NAME}
# The email of the abandoner of the change.
\$GERRIT_CHANGE_ABANDONER_EMAIL = ${GERRIT_CHANGE_ABANDONER_EMAIL}
# The name and email of the owner of the change.
\$GERRIT_CHANGE_OWNER = ${GERRIT_CHANGE_OWNER}
# The name of the owner of the change.
\$GERRIT_CHANGE_OWNER_NAME = ${GERRIT_CHANGE_OWNER_NAME}
# The email of the owner of the change.
\$GERRIT_CHANGE_OWNER_EMAIL = ${GERRIT_CHANGE_OWNER_EMAIL}
# The name and email of the restorer of the change.
\$GERRIT_CHANGE_RESTORER = ${GERRIT_CHANGE_RESTORER}
# The name of the restorer of the change.
\$GERRIT_CHANGE_RESTORER_NAME = ${GERRIT_CHANGE_RESTORER_NAME}
# The email of the restorer of the change.
\$GERRIT_CHANGE_RESTORER_EMAIL = ${GERRIT_CHANGE_RESTORER_EMAIL}
# The name and email of the uploader of the patch-set.
\$GERRIT_PATCHSET_UPLOADER = ${GERRIT_PATCHSET_UPLOADER}
# The name of the uploader of the patch-set.
\$GERRIT_PATCHSET_UPLOADER_NAME = ${GERRIT_PATCHSET_UPLOADER_NAME}
# The email of the uploader of the patch-set.
\$GERRIT_PATCHSET_UPLOADER_EMAIL = ${GERRIT_PATCHSET_UPLOADER_EMAIL}
# The name and email of the person who triggered the event.
\$GERRIT_EVENT_ACCOUNT = ${GERRIT_EVENT_ACCOUNT}
# The name of the person who triggered the event.
\$GERRIT_EVENT_ACCOUNT_NAME = ${GERRIT_EVENT_ACCOUNT_NAME}
# The email of the person who triggered the event.
\$GERRIT_EVENT_ACCOUNT_EMAIL = ${GERRIT_EVENT_ACCOUNT_EMAIL}
# The refname in a ref-updated event.
\$GERRIT_REFNAME = ${GERRIT_REFNAME}
# The old revision in a ref-updated event.
\$GERRIT_OLDREV = ${GERRIT_OLDREV}
# The new revision in a ref-updated event.
\$GERRIT_NEWREV = ${GERRIT_NEWREV}
# The submitter in a ref-updated event.
\$GERRIT_SUBMITTER = ${GERRIT_SUBMITTER}
# The name of the submitter in a ref-updated event.
\$GERRIT_SUBMITTER_NAME = ${GERRIT_SUBMITTER_NAME}
# The email of the submitter in a ref-updated event.
\$GERRIT_SUBMITTER_EMAIL = ${GERRIT_SUBMITTER_EMAIL}
# The name of the Gerrit instance.
\$GERRIT_NAME = ${GERRIT_NAME}
# The host of the Gerrit instance.
\$GERRIT_HOST = ${GERRIT_HOST}
# The port number of the Gerrit instance.
\$GERRIT_PORT = ${GERRIT_PORT}
# The protocol scheme of the Gerrit instance.
\$GERRIT_SCHEME = ${GERRIT_SCHEME}
# The version of the Gerrit instance.
\$GERRIT_VERSION = ${GERRIT_VERSION}
# A hashcode of the Gerrit event object to make sure every set of parameters
# is unique (allowing jenkins to queue duplicate builds).
\$GERRIT_EVENT_HASH = ${GERRIT_EVENT_HASH}
# The type of the event.
\$GERRIT_EVENT_TYPE = ${GERRIT_EVENT_TYPE}
"

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Trigger a shell job with just one line:
env | grep GERRIT_
and see the Build Log

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Really important information, for anyone who bashed their head against the monitor like I did. There was a security update for Jenkins in May 2016 which doesn't allow arbitrary parameters unless they're defined in the job configuration:
https://wiki.jenkins-ci.org/display/JENKINS/Plugins+affected+by+fix+for+SECURITY-170
The parameters defined by Alan Thompson are correct, but you also need to define those parameters in the job configuration.

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They are listed in the help text for the trigger; the little question mark next to the "Gerrit event" trigger checkbox on the job config page.

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I can find a help button that shows all the possible Gerrit triggers, but not one that shows all possible Gerrit environment variables. Please post a screenshot of the correct button to click. – Jonathan Benn Aug 13 '20 at 13:26
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I added a screenshot in the answer above. It's the question mark next to "Gerrit event". – Bjorn Mar 19 '21 at 08:25