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feat: initial action implementation

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# checkout
This action checks-out your repository under $GITHUB_WORKSPACE, so your workflow can access it.
Only a single commit is fetched by default, for the ref/sha that triggered the workflow. The auth token
is persisted in the local git config. This enables your scripts to run authenticated git commands.
This action is only written in shell (bash).
## Usage
```yaml
uses: actions/checkout:1.0.0
with:
repository: ${{ github.server_url }}/${{ github.repository }}.git
token: ${{ github.token }}
path: .
ref: ${{ github.ref || github.sha }}
```

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# SPDX-License-Identifier: EUPL-1.2
name: "Checkout"
description: "Checkout a Git repository at a particular version"
inputs:
repository:
description: >
Repository name with owner. For example, actions/checkout
default: ${{ github.server_url }}/${{ github.repository }}.git
token:
description: >
Personal access token (PAT) used to fetch the repository. The PAT is configured
with the local git config, which enables your scripts to run authenticated git
commands.
default: ${{ github.token }}
path:
description: >
Relative path under $GITHUB_WORKSPACE to place the repository
default: .
ref:
description: >
The branch, tag or SHA to checkout. When checking out the repository that
triggered a workflow, this defaults to the reference or SHA for that
event. Otherwise, uses the default branch.
default: ${{ github.ref || github.sha }}
runs:
using: composite
steps:
- name: Checkout
shell: bash
run: |
export PATH=${{ github.action_path }}/scripts:$PATH
checkout.sh
env:
ACTION_INPUT_TOKEN: ${{ inputs.token }}
ACTION_INPUT_REPOSITORY: ${{ inputs.repository }}
ACTION_INPUT_PATH: ${{ inputs.path }}
ACTION_INPUT_REF: ${{ inputs.ref }}

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#!/usr/bin/env bash
shopt -s extglob
ACTION_INPUT_TOKEN="${ACTION_INPUT_TOKEN:?}"
ACTION_INPUT_REPOSITORY="${ACTION_INPUT_REPOSITORY:?}"
ACTION_INPUT_PATH="${ACTION_INPUT_PATH:?}"
ACTION_INPUT_REF="${ACTION_INPUT_REF:?}"
error() {
echo "$*" 1>&2 ; exit 1;
}
# ensure we are in the right place
[[ -z "${GITHUB_WORKSPACE:-}" ]] || { cd "${GITHUB_WORKSPACE}" || error ; }
git config --global --add protocol.version 2
git init -q "${ACTION_INPUT_PATH}" && { cd "${ACTION_INPUT_PATH}" || error ; }
git config --local gc.auto 0
# the server url and uri are important for determining the default checkout url
GITHUB_SERVER_URL="${GITHUB_SERVER_URL:?}"
GITHUB_SERVER_URI="${GITHUB_SERVER_URL//http?(s):\/\//}"
# use https instead of everything else
git config --add url."${GITHUB_SERVER_URL}/".insteadOf "git@${GITHUB_SERVER_URI}:"
git config --add url."${GITHUB_SERVER_URL}/".insteadOf "ssh://git@${GITHUB_SERVER_URI}/"
git config --add url."${GITHUB_SERVER_URL}/".insteadOf "git://${GITHUB_SERVER_URI}/"
# prepare git config extra header for https auth
BASE64="base64 --wrap 0"
echo "" | ${BASE64} >/dev/null 2>&1 || BASE64="base64"
echo "" | ${BASE64} >/dev/null 2>&1 || BASE64="openssl base64 -A"
echo "" | ${BASE64} >/dev/null 2>&1
GIT_HTTP_EXTRAHEADER="AUTHORIZATION: basic $(echo -n "x-access-token:${ACTION_INPUT_TOKEN}" | ${BASE64})"
git config --local --add http."${GITHUB_SERVER_URL}".extraheader "${GIT_HTTP_EXTRAHEADER}"
# add the repository as remote
git remote add origin "${ACTION_INPUT_REPOSITORY}"
git_default_refspec() {
git ls-remote --symref origin HEAD | { read -r _ ref name ; echo "${ref}" ; }
}
git_resolve_refspec() {
# shellcheck disable=SC2068
git ls-remote origin $@ | { read -r sha ref _ ; echo "${sha} ${ref}" ; }
}
fetch() {
# shellcheck disable=SC2068
git fetch --no-tags --prune --no-recurse-submodules --depth=1 origin $@
}
checkout() {
# shellcheck disable=SC2068
git checkout --force $@
}
# the checkout is based on a commit hash
if [[ ${ACTION_INPUT_REF:-} =~ ^[0-9a-f]{5,40}$ ]]
then
fetch "${ACTION_INPUT_REF}" && checkout "${ACTION_INPUT_REF}"
exit
fi
# update selected ref when no input is given to remote default branch
: "${ACTION_INPUT_REF:=$( git_default_refspec )}"
# TODO: check if repo is workflow repo, if so, use commit sha from env
# like GITHUB_REF and GITHUB_SHA
read -r GIT_SHA GIT_REF _ <<< "$( git_resolve_refspec "${ACTION_INPUT_REF}" )"
: "${GIT_SHA:?}" "${GIT_REF:?}"
# we always use the refspec with the commit sha as source to prevent
# race conditions when running on a frequently used branch
checkout_head() {
local name="${GIT_REF#refs\/heads\/}"
local remote="refs/remotes/origin/${name}"
fetch "+${GIT_SHA}:${remote}"
checkout -B "${name}" "${remote}"
}
checkout_pull() {
local name="${GIT_REF#refs\/pull\/}"
local remote="refs/remotes/pull/${name}"
fetch "+${GIT_SHA}:${remote}"
# pull requests have a special treatment for the branch name. The name
# is determined by the branch the pull request is targeting.
local branch="${GITHUB_BASE_REF:-$( git_default_refspec )}"
checkout -B "${branch#refs\/heads\/}" "${remote}"
}
checkout_tag() {
local name="${GIT_REF#refs\/tags\/}"
local remote="refs/tags/${name}"
fetch "+${GIT_SHA}:${remote}"
checkout "${remote}"
}
case "${GIT_REF}" in
# heads and pull are a branch based checkout
refs/heads/*) checkout_head ;;
refs/pull/* ) checkout_pull ;;
# tags are a detached head checkout
refs/tags/* ) checkout_tag ;;
*) error "ref type '${GIT_REF}' is unknown" ;;
esac