do nothing if nothing is pushed

Fixes: https://code.forgejo.org/actions/cascading-pr/issues/6

tests/originrepo-do-nothing/.forgejo/workflows/test.yml

@@ -0,0 +1,25 @@
+# SPDX-License-Identifier: MIT
+name: test
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - closed
+jobs:
+  test:
+    runs-on: docker
+    steps:
+      - uses: actions/checkout@v4
+      - uses: SELF@vTest
+        with:
+          origin-url: ${{ env.GITHUB_SERVER_URL }}
+          origin-repo: user1/originrepo-do-nothing
+          origin-token: ${{ secrets.ORIGIN_TOKEN }}
+          origin-pr: ${{ github.event.pull_request.number }}
+          destination-url: ${{ env.GITHUB_SERVER_URL }}
+          destination-repo: user2/destinationrepo
+          destination-branch: main
+          destination-token: ${{ secrets.DESTINATION_TOKEN }}
+          update: /bin/true
+          debug: true

tests/originrepo-do-nothing/README

@@ -0,0 +1 @@
+originrepo

tests/originrepo/upgraded

@@ -7,7 +7,6 @@ destination_pr_json="$2"
 origin_pr_json="$3"
 
 test -d $destination_checkout
-test -f $destination_pr_json
 test -f $origin_pr_json
 
 date +%s > $destination_checkout/last

tests/run.sh

@@ -38,7 +38,7 @@ function user_token() {
 function user_secret() {
     local username=$1 name=$2 token=$3
 
-    user_curl $username api_json -X PUT --data '{"data":"'$token'"}' ${options[url]}/api/v1/repos/user1/originrepo/actions/secrets/$name
+    user_curl $username api_json -X PUT --data '{"data":"'$token'"}' ${options[url]}/api/v1/user/actions/secrets/$name
 }
 
 function user_create() {
@@ -60,27 +60,34 @@ function merge_pull_request() {
     done
 }
 
+function has_cascade_pull_request() {
+    pr_count=$(forgejo-curl.sh api_json ${options[url]}/api/v1/repos/user2/destinationrepo/pulls | jq '. | length')
+    test $pr_count -gt 0
+}
+
 function create_pull_request() {
-    forgejo-curl.sh api_json ${options[url]}/api/v1/repos/user1/originrepo/pulls | jq --raw-output '.[] | .number' | while read pr ; do
-	forgejo-curl.sh api_json -X DELETE ${options[url]}/api/v1/repos/user1/originrepo/issues/$pr
+    local originrepo=$1
+
+    forgejo-curl.sh api_json ${options[url]}/api/v1/repos/user1/${originrepo}/pulls | jq --raw-output '.[] | .number' | while read pr ; do
+	forgejo-curl.sh api_json -X DELETE ${options[url]}/api/v1/repos/user1/${originrepo}/issues/$pr
     done
-    forgejo-curl.sh api_json -X DELETE ${options[url]}/api/v1/repos/user1/originrepo/branches/branch1 >& /dev/null || true
-    forgejo-curl.sh api_json --data '{"new_branch_name":"branch1"}' ${options[url]}/api/v1/repos/user1/originrepo/branches
+    forgejo-curl.sh api_json -X DELETE ${options[url]}/api/v1/repos/user1/${originrepo}/branches/branch1 >& /dev/null || true
+    forgejo-curl.sh api_json --data '{"new_branch_name":"branch1"}' ${options[url]}/api/v1/repos/user1/${originrepo}/branches
     (
 	cd $TMPDIR
-	rm -fr originrepo
-	git clone -b branch1 http://user1:admin1234@${options[host_port]}/user1/originrepo
-	cd originrepo
+	rm -fr ${originrepo}
+	git clone -b branch1 http://user1:admin1234@${options[host_port]}/user1/${originrepo}
+	cd ${originrepo}
 	echo CONTENT > README
 	git config user.email root@example.com
 	git config user.name username
 	git add .
 	git commit -m 'update'
 	git push origin branch1
-	git rev-parse HEAD > ../originrepo.sha
+	git rev-parse HEAD > ../${originrepo}.sha
     )
 
-    forgejo-curl.sh api_json --data '{"title":"PR","base":"main","head":"branch1"}' ${options[url]}/api/v1/repos/user1/originrepo/pulls
+    forgejo-curl.sh api_json --data '{"title":"PR","base":"main","head":"branch1"}' ${options[url]}/api/v1/repos/user1/${originrepo}/pulls
 }
 
 function finalize_options() {
@@ -143,34 +150,55 @@ function unit_retry() {
     grep --quiet 'retry failed' $TMPDIR/retry.log
 }
 
-function integration() {
+function fixture() {
+    local origin=$1
+    local destination=$2
+
     user_create user2 user2@example.com
-    forgejo-test-helper.sh push tests/destinationrepo http://user2:admin1234@${options[host_port]} user2 destinationrepo
+    forgejo-test-helper.sh push tests/${destination} http://user2:admin1234@${options[host_port]} user2 ${destination}
 
     user_create user1 user1@example.com
-    forgejo-test-helper.sh push tests/originrepo http://user1:admin1234@${options[host_port]} user1 originrepo cascading-pr
+    forgejo-test-helper.sh push tests/${origin} http://user1:admin1234@${options[host_port]} user1 ${origin} cascading-pr
     user_secret user1 ORIGIN_TOKEN $(user_token user1 ORIGIN_TOKEN)
     user_secret user1 DESTINATION_TOKEN $(user_token user2 DESTINATION_TOKEN)
 
     push_self
+}
 
-    #
-    # create & close
-    #
-    create_pull_request
+function no_change_no_cascade_pr() {
+    fixture originrepo-do-nothing destinationrepo
+
+    create_pull_request originrepo-do-nothing
+    wait_success ${options[url]}/api/v1/repos/user1/originrepo-do-nothing $(cat $TMPDIR/originrepo-do-nothing.sha)
+    ! has_cascade_pull_request
+}
+
+function create_and_close() {
+    fixture originrepo destinationrepo
+
+    create_pull_request originrepo
     wait_success ${options[url]}/api/v1/repos/user1/originrepo $(cat $TMPDIR/originrepo.sha)
+    has_cascade_pull_request
     close_pull_request
     wait_success ${options[url]}/api/v1/repos/user1/originrepo $(cat $TMPDIR/originrepo.sha)
+}
 
-    #
-    # create & merge
-    #
-    create_pull_request
+function create_and_merge() {
+    fixture originrepo destinationrepo
+
+    create_pull_request originrepo
     wait_success ${options[url]}/api/v1/repos/user1/originrepo $(cat $TMPDIR/originrepo.sha)
+    has_cascade_pull_request
     merge_pull_request
     wait_success ${options[url]}/api/v1/repos/user1/originrepo $(cat $TMPDIR/originrepo.sha)
 }
 
+function integration() {
+    no_change_no_cascade_pr
+    create_and_close
+    create_and_merge
+}
+
 function unit() {
     unit_retry
 }