From f9e20e777076145c24fe4f52add2f19b10319663 Mon Sep 17 00:00:00 2001
From: Earl Warren <contact@earl-warren.org>
Date: Mon, 27 May 2024 16:57:05 +0200
Subject: [PATCH] actions: add automerge example

---
 .editorconfig                                 |   9 +-
 actions/actions.sh                            |   2 +-
 .../.forgejo/workflows/test.yml               |  13 +++
 actions/example-automerge/run.sh              |  69 +++++++++++
 actions/example-automerge/setup.sh            |   1 +
 lib/api.sh                                    | 108 ++++++++++++++++++
 lib/lib.sh                                    |   2 +
 7 files changed, 202 insertions(+), 2 deletions(-)
 create mode 100644 actions/example-automerge/.forgejo/workflows/test.yml
 create mode 100755 actions/example-automerge/run.sh
 create mode 100755 actions/example-automerge/setup.sh
 create mode 100644 lib/api.sh

diff --git a/.editorconfig b/.editorconfig
index c17e595..669640d 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -1,3 +1,10 @@
 root = true
+
 [*]
-tab_width: 8
+indent_style = space
+indent_size = 4
+tab_width = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
diff --git a/actions/actions.sh b/actions/actions.sh
index 32b110b..dd38510 100755
--- a/actions/actions.sh
+++ b/actions/actions.sh
@@ -114,7 +114,7 @@ function test_actions() {
 	fi
 
         if dpkg --compare-versions $version ge 7.1 ; then
-            for example in post-7-0-schedule ; do
+            for example in automerge post-7-0-schedule ; do
                 run actions_verify_example $example
             done
         fi
diff --git a/actions/example-automerge/.forgejo/workflows/test.yml b/actions/example-automerge/.forgejo/workflows/test.yml
new file mode 100644
index 0000000..3ce5da0
--- /dev/null
+++ b/actions/example-automerge/.forgejo/workflows/test.yml
@@ -0,0 +1,13 @@
+on:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: docker
+    container:
+      image: code.forgejo.org/oci/node:20-bookworm
+      options: "--volume /srv/example:/srv/example"
+
+    steps:
+      - run: |
+          ${{ vars.SCRIPT }}
diff --git a/actions/example-automerge/run.sh b/actions/example-automerge/run.sh
new file mode 100755
index 0000000..e7f5395
--- /dev/null
+++ b/actions/example-automerge/run.sh
@@ -0,0 +1,69 @@
+TMPDIR=$(mktemp -d)
+
+trap "rm -fr $TMPDIR" EXIT
+
+source $EXAMPLE_DIR/../../lib/lib.sh
+
+api=$url/api/v1
+export d=/srv/example/automerge
+
+PROOF='some proof'
+
+function main() {
+    #
+    # repository with a pull_request event workflow that always succeeds
+    #
+    mkdir -p $d
+
+    forgejo-test-helper.sh push_workflow actions/example-$example $url root example-$example setup-forgejo $token
+
+    local repo=root/example-automerge
+
+    forgejo-curl.sh api_json -X DELETE $api/repos/$repo/actions/variables/SCRIPT >&/dev/null || true
+    forgejo-curl.sh api_json -X POST --data-raw '{"value":"true"}' $api/repos/$repo/actions/variables/SCRIPT
+
+    (
+        cd $d
+        git clone $url/$repo
+        cd example-automerge
+        git checkout -b other
+        git config user.email root@example.com
+        git config user.name username
+        touch file-unique-to-the-pr-branch
+        echo other $PROOF >>README
+        git add .
+        git commit -m 'other change'
+        git push --force -u origin other
+    )
+
+    #
+    # make sure the runner won't race with the sequence that follows
+    #
+    forgejo-runner.sh teardown
+    #
+    # create a PR and schedule it for automerge when the workflow succeeds
+    #
+    api_pr_delete_all $api $repo
+    forgejo-curl.sh api_json --data-raw '{"title":"PR title","base":"main","head":"other"}' $api/repos/$repo/pulls >$TMPDIR/pr.json
+    local pr=$(jq -r .number <$TMPDIR/pr.json)
+    forgejo-curl.sh api_json --data-raw '{"Do":"merge","merge_when_checks_succeed":true}' $api/repos/$repo/pulls/$pr/merge
+    if api_pr_is_merged $api $repo $pr; then
+        echo pull request already merged although it should not be
+        return 1
+    fi
+    #
+    # run the workflow
+    #
+    forgejo-runner.sh run
+    local sha=$(api_branch_tip $api $repo other)
+    api_pr_wait_success $api $repo $sha
+    #
+    # verify the PR was automerged
+    #
+    if ! retry api_pr_is_merged $api $repo $pr; then
+        echo pull request is not automerged as expected
+        return 1
+    fi
+}
+
+main
diff --git a/actions/example-automerge/setup.sh b/actions/example-automerge/setup.sh
new file mode 100755
index 0000000..9476a67
--- /dev/null
+++ b/actions/example-automerge/setup.sh
@@ -0,0 +1 @@
+mkdir -p /srv/example/automerge
diff --git a/lib/api.sh b/lib/api.sh
new file mode 100644
index 0000000..b58984a
--- /dev/null
+++ b/lib/api.sh
@@ -0,0 +1,108 @@
+#!/bin/bash
+# Copyright 2024 The Forgejo Authors
+# SPDX-License-Identifier: MIT
+
+API_TMPDIR=$(mktemp -d)
+
+function api_branch_tip() {
+    local api="$1"
+    local repo="$2"
+    local branch="$3"
+
+    retry forgejo-curl.sh api_json $api/repos/$repo/branches/$branch >&/dev/null
+    forgejo-curl.sh api_json $api/repos/$repo/branches/$branch | jq --raw-output .commit.id
+}
+
+function api_pr_is_merged() {
+    local api="$1"
+    local repo="$2"
+    local pr="$3"
+
+    forgejo-curl.sh api_json $api/repos/$repo/pulls/$pr >$API_TMPDIR/pr.json
+    $(jq -r .merged <$API_TMPDIR/pr.json)
+}
+
+function api_pr_delete_all() {
+    local api="$1"
+    local repo="$2"
+
+    forgejo-curl.sh api_json $api/repos/${repo}/pulls | jq --raw-output '.[] | .number' | while read pr; do
+        forgejo-curl.sh api_json -X DELETE $api/repos/${repo}/issues/$pr
+    done
+}
+
+function api_pr_get_status() {
+    local api="$1"
+    local repo="$2"
+    local sha="$3"
+
+    forgejo-curl.sh api_json $api/repos/$repo/commits/$sha/status
+}
+
+function api_pr_check_status() {
+    local api="$1"
+    local repo="$2"
+    local sha="$3"
+    local expected_status="$4"
+    local expected_description="$5"
+
+    api_pr_get_status $api $repo $sha >$API_TMPDIR/status.json
+    local status="$(jq --raw-output .state <$API_TMPDIR/status.json)"
+    local description="$(jq --raw-output .statuses[0].description <$API_TMPDIR/status.json)"
+    if test "$status" = "$expected_status" && test -z "$expected_description" -o "$description" = "$expected_description"; then
+        echo OK
+    elif test "$status" = "failure" -o "$status" = "success"; then
+        echo NOK
+    else
+        echo RETRY
+    fi
+}
+
+function api_pr_wait_success() {
+    api_pr_wait_status success "$@"
+}
+
+function api_pr_wait_failure() {
+    api_pr_wait_status failure "$@"
+}
+
+function api_pr_wait_running() {
+    api_pr_wait_status pending "$@" "Has started running"
+}
+
+function api_pr_wait_log() {
+    local sha="$1" expected_status="$2" expected_description="$3"
+    local status="$(jq --raw-output .state <$API_TMPDIR/status.json)"
+    local description="$(jq --raw-output .statuses[0].description <$API_TMPDIR/status.json)"
+    if test "$expected_description"; then
+        expected_description=" '$expected_description'"
+    fi
+    log_info "$sha status waiting '$expected_status'$expected_description, currently '$status' '$description'"
+}
+
+# default loop delay is 3600 sec (1 hour)
+: ${API_LOOPS:=100}
+: ${API_LOOP_DELAY:=36}
+
+function api_pr_wait_status() {
+    local status="$1"
+    local api="$2"
+    local repo="$3"
+    local sha="$4"
+    local description="$5"
+
+    for i in $(seq $API_LOOPS); do
+        if test $(api_pr_check_status "$api" "$repo" "$sha" "$status" "$description") != RETRY; then
+            break
+        fi
+        api_pr_wait_log "$sha" "$status" "$description"
+        sleep $API_LOOP_DELAY
+    done
+    if test $(api_pr_check_status "$api" "$repo" "$sha" "$status" "$description") = "OK"; then
+        log_info "$sha status OK"
+    else
+        api_pr_get_status $api $repo $sha | jq .statuses
+        log_info "$sha status NOK"
+        return 1
+    fi
+}
diff --git a/lib/lib.sh b/lib/lib.sh
index 2daa32e..dc1a319 100644
--- a/lib/lib.sh
+++ b/lib/lib.sh
@@ -4,6 +4,8 @@
 
 LIB_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
+source $LIB_DIR/api.sh
+
 if ${VERBOSE:-false} ; then
     set -ex
     PS4='${BASH_SOURCE[0]}:$LINENO: ${FUNCNAME[0]}:  '