Build triggers configuration in GCP - Step-by-Step Execution

Process Flow - Build triggers configuration

Create Trigger Config

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Specify Source Repo

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Define Event Type

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Set Build Steps

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Save Trigger

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Trigger Listens for Events

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On Event: Start Build

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Build Executes

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Build Completes

This flow shows how a build trigger is configured to listen for events in a source repository and start a build automatically.

Execution Sample

GCP

gcloud beta builds triggers create github \
  --name="my-trigger" \
  --repo-name="my-repo" \
  --repo-owner="my-owner" \
  --branch-pattern="^main$" \
  --build-config="cloudbuild.yaml"

This command creates a build trigger that starts a build when changes are pushed to the main branch of a GitHub repo.

Process Table

Step	Action	Input/Condition	Result/Output
1	Create Trigger Config	Name=my-trigger	Trigger config object created
2	Specify Source Repo	Repo=my-repo owned by my-owner	Source repository linked
3	Define Event Type	Branch pattern ^main$	Trigger listens to pushes on main branch
4	Set Build Steps	Build config file cloudbuild.yaml	Build steps defined
5	Save Trigger	All config set	Trigger saved and active
6	Trigger Listens for Events	Push event on main branch	Trigger detects event
7	On Event: Start Build	Event detected	Build process starts
8	Build Executes	Build steps run	Build runs according to config
9	Build Completes	Build finished	Build success or failure reported

💡 Build completes after executing all defined steps or fails if errors occur

Status Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	After Step 4	After Step 5	After Step 6	After Step 7	After Step 8	Final
trigger_config	null	created with name	linked to repo	event type set	build steps set	saved and active	listening	event detected	build running	build finished

Key Moments - 3 Insights

Why does the trigger only start builds on the main branch?

Because in step 3, the branch pattern is set to '^main$', so only pushes to the main branch match and start the build (see execution_table row 3).

What happens if the build config file is missing or incorrect?

At step 8, the build executes the steps defined in the config file. If the file is missing or invalid, the build will fail (see execution_table row 8 and 9).

Does the trigger start builds for pull requests automatically?

No, unless the event type is configured to listen for pull request events. Here, only push events on the main branch are configured (see execution_table row 3).

Visual Quiz - 3 Questions

Look at the execution table, at which step is the trigger saved and becomes active?

A Step 5

B Step 3

C Step 7

D Step 9

💡 Hint

Check the 'Result/Output' column for when the trigger is 'saved and active' (row 5).

According to the variable tracker, what is the state of 'trigger_config' after step 4?

A Created with name

B Linked to repo

C Build steps set

D Event detected

💡 Hint

Look at the 'After Step 4' column for 'trigger_config' in variable_tracker.

If the branch pattern was changed to '^dev$', when would the trigger start builds?

A On pushes to the main branch

B On pushes to the dev branch

C On pushes to any branch

D On pull requests only

💡 Hint

Refer to execution_table row 3 about branch pattern matching.

Concept Snapshot

Build triggers listen for events in source repos.
Configure with name, repo, event type (e.g., branch pattern), and build steps.
Trigger activates after saving.
Starts builds automatically on matching events.
Build steps run as defined in config file.

Full Transcript

This visual execution shows how to configure a build trigger in Google Cloud Platform. First, a trigger configuration is created with a name. Then, the source repository is specified by name and owner. Next, the event type is defined, such as listening for pushes to the main branch. Build steps are set using a build configuration file. After saving, the trigger becomes active and listens for events. When a matching event occurs, the trigger starts the build process, which executes the defined steps. The build completes with success or failure. Variables like the trigger configuration change state at each step, from creation to active listening to build running and finishing. Key points include understanding branch pattern matching, the importance of the build config file, and event types that start builds. The quiz tests knowledge of trigger saving, variable states, and event matching.