Initial add - now to use it!

.buildkite/pipeline.yml

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+steps:
+  - label: ":hammer: Test"
+    plugins:
+      docker-compose#v1.3.1:
+        run: tests
+  - label: ":sparkles: Lint"
+    plugins:
+      plugin-linter#v2.0.0:
+        id: tendnz/git-tag
+  - label: ":shell: Shellcheck"
+    plugins:
+      shellcheck#v1.0.1:
+        files: hooks/**

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2018 The Dyrt
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Git Tag Buildkite Plugin
+
+A [Buildkite plugin](https://buildkite.com/docs/agent/v3/plugins) to tag the current head with a version and push it to the repo.
+
+Based heavily on [Git Commit](https://github.com/thedyrt/git-commit-buildkite-plugin).
+
+## Example
+
+With no options, tags the `$BUILDKITE_BRANCH` and pushes the tags, with a commit message like `Build #4`:
+
+```yml
+steps:
+  - command: make
+    plugins:
+      - tendnz/git-tag#v1.0.0:
+          version: "v1.0.0-prod" 
+```
+
+With all options customized:
+
+```yml
+steps:
+  - command: make
+    plugins:
+      - tendnz/git-tag#v1.0.0:
+          version: "v1.0.0-prod"
+          message: "Release to $ENV [$BUILDKITE_BUILD_NUMBER]"
+          user:
+            name: Bob Monkey
+            email: [email protected]
+```
+
+## Configuration
+
+- **version** (required))
+
+    A tag to use in `git tag $VERSION`
+
+- **message** (optional, defaults to `Build #${BUILDKITE_BUILD_NUMBER}`)
+
+    The commit message
+
+- **user.email** (optional)
+
+    If given, will configure the git user email for the repo.
+
+- **user.name** (optional)
+
+    If given, will configure the git user name for the repo.
+
+
+## Tests / Linting
+
+To run the tests of this plugin, run
+
+```sh
+docker-compose run --rm tests
+```
+
+To run the [Buildkite Plugin Linter](https://github.com/buildkite-plugins/buildkite-plugin-linter), run
+
+```sh
+docker-compose run --rm lint
+```
+
+## License
+
+MIT (see [LICENSE](LICENSE))

docker-compose.yml

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+version: '2'
+services:
+  tests:
+    image: buildkite/plugin-tester
+    volumes:
+      - ".:/plugin:ro"
+  lint:
+    image: buildkite/plugin-linter
+    command: ['--id', 'tendnz/git-tag']
+    volumes:
+      - ".:/plugin:ro"

hooks/post-command

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+#!/usr/bin/env bash
+
+set -euo pipefail
+
+if [[ ${BUILDKITE_COMMAND_EXIT_STATUS:-0} != "0" ]]
+then
+  echo "--- Skipping git-tag because the command failed"
+  exit 0
+fi
+
+branch=${BUILDKITE_PLUGIN_GIT_TAG_BRANCH:-${BUILDKITE_BRANCH}}
+message=${BUILDKITE_PLUGIN_GIT_TAG_MESSAGE:-"Build #${BUILDKITE_BUILD_NUMBER}"}
+
+if [[ -n ${BUILDKITE_PLUGIN_GIT_TAG_USER_NAME+x} ]]
+then
+  git config user.name "$BUILDKITE_PLUGIN_GIT_TAG_USER_NAME"
+fi
+
+if [[ -n ${BUILDKITE_PLUGIN_GIT_TAG_USER_EMAIL+x} ]]
+then
+  git config user.email "$BUILDKITE_PLUGIN_GIT_TAG_USER_EMAIL"
+fi
+
+echo "--- Tagging with ${BUILDKITE_PLUGIN_GIT_TAG_VERSION}"
+git tag "${BUILDKITE_PLUGIN_GIT_TAG_VERSION}" -m "${BUILDKITE_PLUGIN_GIT_TAG_MESSAGE}"
+git push --tags
+echo "--- Tags pushed"

plugin.yml

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+name: Git Tag
+description: A Buildkite plugin to tag the current git repository with a specific value
+author: https://github.com/nicwise
+requirements: []
+configuration:
+  properties:
+    version:
+      type: string
+    message:
+      type: string
+    user:
+      type: object
+      properties:
+        email:
+          type: string
+        name:
+          type: string

tests/post-command.bats

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+#!/usr/bin/env bats
+
+load '/usr/local/lib/bats/load.bash'
+
+post_command_hook="$PWD/hooks/post-command"
+
+
+echo "needs ot have some tests"