skip all pipelines based on what is in the PR (#6996)

* add droneignore, make trivial change to README for testing, updating drone config to use droneignore to skip CI when files are all matched

Signed-off-by: matttrach <matttrach@gmail.com>

.drone.yml

@@ -7,6 +7,22 @@ platform:
   arch: amd64
 
 steps:
+- name: skipfiles
+  image: plugins/git
+  commands:
+  - export NAME=$(test $DRONE_BUILD_EVENT = pull_request && echo remotes/origin/${DRONE_COMMIT_BRANCH:-master} || echo ${DRONE_COMMIT_SHA}~)
+  - export DIFF=$(git --no-pager diff --name-only $NAME | grep -v -f .droneignore);
+  - if [ -z "$DIFF" ]; then
+        echo "All files in PR are on ignore list";
+        exit 78;
+    else
+        echo "Some files in PR are not ignored, $DIFF";
+    fi;
+  when:
+    event:
+    - push
+    - pull_request
+
 - name: build
   image: rancher/dapper:v0.5.0
   secrets: [ AWS_SECRET_ACCESS_KEY-k3s-ci-uploader, AWS_ACCESS_KEY_ID-k3s-ci-uploader, unprivileged_github_token ]
@@ -179,6 +195,22 @@ platform:
   arch: arm64
 
 steps:
+- name: skipfiles
+  image: plugins/git
+  commands:
+  - export NAME=$(test $DRONE_BUILD_EVENT = pull_request && echo remotes/origin/${DRONE_COMMIT_BRANCH:-master} || echo ${DRONE_COMMIT_SHA}~)
+  - export DIFF=$(git --no-pager diff --name-only $NAME | grep -v -f .droneignore);
+  - if [ -z "$DIFF" ]; then
+        echo "All files in PR are on ignore list";
+        exit 78;
+    else
+        echo "Some files in PR are not ignored, $DIFF";
+    fi;
+  when:
+    event:
+    - push
+    - pull_request
+
 - name: build
   image: rancher/dapper:v0.5.0
   secrets: [ AWS_SECRET_ACCESS_KEY-k3s-ci-uploader, AWS_ACCESS_KEY_ID-k3s-ci-uploader ]
@@ -265,6 +297,22 @@ platform:
   arch: arm
 
 steps:
+- name: skipfiles
+  image: plugins/git
+  commands:
+  - export NAME=$(test $DRONE_BUILD_EVENT = pull_request && echo remotes/origin/${DRONE_COMMIT_BRANCH:-master} || echo ${DRONE_COMMIT_SHA}~)
+  - export DIFF=$(git --no-pager diff --name-only $NAME | grep -v -f .droneignore);
+  - if [ -z "$DIFF" ]; then
+        echo "All files in PR are on ignore list";
+        exit 78;
+    else
+        echo "Some files in PR are not ignored, $DIFF";
+    fi;
+  when:
+    event:
+    - push
+    - pull_request
+
 - name: build
   image: rancher/dapper:v0.5.0
   secrets: [ AWS_SECRET_ACCESS_KEY-k3s-ci-uploader, AWS_ACCESS_KEY_ID-k3s-ci-uploader ]
@@ -365,6 +413,22 @@ steps:
   - git fetch origin $DRONE_COMMIT_REF
   - git checkout $DRONE_COMMIT -b origin/$DRONE_TARGET_BRANCH
 
+- name: skipfiles
+  image: alpine/git:v2.30.2-s390x
+  commands:
+  - export NAME=$(test $DRONE_BUILD_EVENT = pull_request && echo remotes/origin/${DRONE_COMMIT_BRANCH:-master} || echo ${DRONE_COMMIT_SHA}~)
+  - export DIFF=$(git --no-pager diff --name-only $NAME | grep -v -f .droneignore);
+  - if [ -z "$DIFF" ]; then
+        echo "All files in PR are on ignore list";
+        exit 78;
+    else
+        echo "Some files in PR are not ignored, $DIFF";
+    fi;
+  when:
+    event:
+    - push
+    - pull_request
+
 - name: build
   image: rancher/dapper:v0.5.8
   secrets: [ AWS_SECRET_ACCESS_KEY-k3s-ci-uploader, AWS_ACCESS_KEY_ID-k3s-ci-uploader ]
@@ -455,7 +519,23 @@ platform:
   arch: amd64
 
 steps:
-  - name: validate_go_mods
+- name: skipfiles
+  image: plugins/git
+  commands:
+  - export NAME=$(test $DRONE_BUILD_EVENT = pull_request && echo remotes/origin/${DRONE_COMMIT_BRANCH:-master} || echo ${DRONE_COMMIT_SHA}~)
+  - export DIFF=$(git --no-pager diff --name-only $NAME | grep -v -f .droneignore);
+  - if [ -z "$DIFF" ]; then
+        echo "All files in PR are on ignore list";
+        exit 78;
+    else
+        echo "Some files in PR are not ignored, $DIFF";
+    fi;
+  when:
+    event:
+    - push
+    - pull_request
+
+- name: validate_go_mods
   image: rancher/dapper:v0.5.0
   commands:
   - docker build --target test-mods -t k3s:mod -f Dockerfile.test .
@@ -464,8 +544,9 @@ steps:
   volumes:
   - name: docker
     path: /var/run/docker.sock
+
 volumes:
-  - name: docker
+- name: docker
   host:
     path: /var/run/docker.sock
 
@@ -478,6 +559,22 @@ platform:
   arch: amd64
 
 steps:
+- name: skipfiles
+  image: plugins/git
+  commands:
+  - export NAME=$(test $DRONE_BUILD_EVENT = pull_request && echo remotes/origin/${DRONE_COMMIT_BRANCH:-master} || echo ${DRONE_COMMIT_SHA}~)
+  - export DIFF=$(git --no-pager diff --name-only $NAME | grep -v -f .droneignore);
+  - if [ -z "$DIFF" ]; then
+        echo "All files in PR are on ignore list";
+        exit 78;
+    else
+        echo "Some files in PR are not ignored, $DIFF";
+    fi;
+  when:
+    event:
+    - push
+    - pull_request
+
 - name: manifest
   image: plugins/docker
   environment:
@@ -518,6 +615,22 @@ platform:
   arch: amd64
 
 steps:
+- name: skipfiles
+  image: plugins/git
+  commands:
+  - export NAME=$(test $DRONE_BUILD_EVENT = pull_request && echo remotes/origin/${DRONE_COMMIT_BRANCH:-master} || echo ${DRONE_COMMIT_SHA}~)
+  - export DIFF=$(git --no-pager diff --name-only $NAME | grep -v -f .droneignore);
+  - if [ -z "$DIFF" ]; then
+        echo "All files in PR are on ignore list";
+        exit 78;
+    else
+        echo "Some files in PR are not ignored, $DIFF";
+    fi;
+  when:
+    event:
+    - push
+    - pull_request
+
 - name: dispatch
   image: curlimages/curl:7.74.0
   user: root

.droneignore

@@ -0,0 +1,9 @@
+^.*\.md$
+^install\.sh$
+^\.droneignore$
+^\.github/*$
+^MAINTAINERS$
+^CODEOWNERS$
+^LICENSE$
+^DCO$
+^channel\.yaml$

README.md

@@ -160,4 +160,5 @@ Please check out our [contributing guide](CONTRIBUTING.md) if you're interested
 Security
 --------
 
-Security issues in K3s can be reported by sending an email to [security@k3s.io](mailto:security@k3s.io). Please do not file issues about security issues.
+Security issues in K3s can be reported by sending an email to [security@k3s.io](mailto:security@k3s.io).
+Please do not file issues about security issues.