From 8e729c9eae60ec4a95d6a7703aab2cdca88d7360 Mon Sep 17 00:00:00 2001
From: Jasmine Baral <jasmine.baral@hotmail.com>
Date: Fri, 30 Jul 2021 18:03:51 +0545
Subject: [PATCH] first commit

---
 .drone.star                      | 50 +++++++++++++++++++++++++-
 tests/acceptance/cancelBuilds.sh | 60 ++++++++++++++++++++++++++++++++
 2 files changed, 109 insertions(+), 1 deletion(-)
 create mode 100755 tests/acceptance/cancelBuilds.sh

diff --git a/.drone.star b/.drone.star
index 5644fa288f..6e0291a885 100644
--- a/.drone.star
+++ b/.drone.star
@@ -125,7 +125,8 @@ def main(ctx):
     test_pipelines = \
         [buildOcisBinaryForTesting(ctx)] + \
         testOcisModules(ctx) + \
-        testPipelines(ctx)
+        testPipelines(ctx) + \
+        checkForRecentBuilds(ctx)
 
     build_release_pipelines = \
         dockerReleases(ctx) + \
@@ -190,6 +191,53 @@ def testOcisModules(ctx):
 
     return pipelines + [scan_result_upload]
 
+def checkForRecentBuilds(ctx):
+    pipelines = []
+
+    result = {
+        "kind": "pipeline",
+        "type": "docker",
+        "name": "stop-recent-builds",
+        "steps": stopRecentBuilds(ctx),
+        "depends_on": [],
+        "trigger": {
+            "ref": [
+                "refs/heads/master",
+                "refs/tags/**",
+                "refs/pull/**",
+            ],
+        },
+    }
+
+    pipelines.append(result)
+
+    return pipelines
+
+def stopRecentBuilds(ctx):
+    repo_slug = ctx.build.source_repo if ctx.build.source_repo else ctx.repo.slug
+
+    return [{
+        "name": "stop-recent-builds",
+        "image": "drone/cli:alpine",
+        "pull": "always",
+        "environment": {
+            "DRONE_SERVER": "https://drone.owncloud.com",
+            "DRONE_TOKEN": {
+                "from_secret": "drone_token",
+            },
+        },
+        "commands": [
+            "drone build ls %s --status running > /drone/src/recentBuilds.txt" % repo_slug,
+            "drone build info %s ${DRONE_BUILD_NUMBER} > /drone/src/thisBuildInfo.txt" % repo_slug,
+            "cd /drone/src && ./tests/acceptance/cancelBuilds.sh",
+        ],
+        "when": {
+            "event": [
+                "pull_request",
+            ],
+        },
+    }]
+
 def testPipelines(ctx):
     pipelines = []
     if "skip" not in config["localApiTests"] or not config["localApiTests"]["skip"]:
diff --git a/tests/acceptance/cancelBuilds.sh b/tests/acceptance/cancelBuilds.sh
new file mode 100755
index 0000000000..cdebb968a9
--- /dev/null
+++ b/tests/acceptance/cancelBuilds.sh
@@ -0,0 +1,60 @@
+SCRIPT_PATH=$(dirname "$0")
+SCRIPT_PATH=$( cd "${SCRIPT_PATH}" && pwd )  # normalized and made absolute
+OWNCLOUD_OCIS="owncloud/ocis"
+
+# The recentBuilds.txt file contains all the information of the PR whose builds are recently running.
+# Therefore, to filter out the BuildID and the Reference from all the recent builds which are running,
+# the following awk command is used and the output containing the BuildId and the Reference of each
+# builds/prs are stored in the filteredDescriptions.txt file.
+echo ${SCRIPT_PATH}
+awk "/Build #|Ref: refs\/pull/" ${SCRIPT_PATH}/../../recentBuilds.txt > ${SCRIPT_PATH}/filteredDescriptions.txt
+
+# The thisBuildInfo.txt file contains the information of the current Build, including the BuildID, Reference, and
+# other information of that particular build. To get the reference number/ pr number of the recent build,
+# the following awk command and grep commands are used, where the Reference part ("Ref: refs/pull/5496/head")
+# is stored in the "thisBuildFiltered.txt" file. From the reference, only the pr/reference number is extracted into
+# the "NUMBER" variable.
+awk "/Ref: refs\/pull/" ${SCRIPT_PATH}/../../thisBuildInfo.txt > ${SCRIPT_PATH}/thisBuildFiltered.txt
+NUMBER=$(grep -o -E "[0-9]+" ${SCRIPT_PATH}/thisBuildFiltered.txt)
+referenceNum="Ref: refs/pull/"$NUMBER"/head"
+
+# From all the recent builds, the information about the BuildID and the reference which was stored in the
+# "filteredDescriptions.txt" file, only the BuildID part from each of the buildInformation whose Reference is
+# exactly same as that of the current build reference is filtered and stored in the "buildsToStop.txt" file.
+# The buildIDs and the reference information of each build is stored sequentially in the "filteredDescriptions.txt" file as:
+
+# "Build #<buildID-1>"
+# "<ReferenceInformationOfBuildID-1>"
+# "Build #<buildID-2>"
+# "<ReferenceInformationOfBuildID-2>"
+# "Build #<buildID-n>"
+# "<ReferenceInformationOfBuildID-n>"
+
+# Therefore the following awk command extracts each lines just above the expected reference information.
+awk -v ref="$referenceNum" 'index($0,ref){print p} {p=$0}' ${SCRIPT_PATH}/filteredDescriptions.txt > ${SCRIPT_PATH}/buildsToStop.txt
+
+
+# The "buildsToStop.txt" file now contains the buildIDs of the recent builds whose reference id was equal to the reference of the
+# current pr/build.
+
+# "Build #<BuildID-1>"
+# "Build #<BuildID-2>"
+# "Build #<BuildID-3>"
+# "Build #<BuildID-4>"
+# "Build #<BuildID-m>"
+
+# For each build in the "buildsToStop.txt" file, if the build number is older than the current drone build number, the build is cancelled.
+
+while IFS="" read -r p || [ -n "$p" ]
+do
+  printf '%s\n' "$p"
+  buildNumber=$(echo "$p" | awk -F'#' '{print $(2)}')
+
+ if [ $DRONE_BUILD_NUMBER \> "$buildNumber" ]
+ then
+   echo "CANCELLING BUILD: " $buildNumber
+   drone build stop $OWNCLOUD_OCIS $buildNumber
+  fi
+
+done <${SCRIPT_PATH}/buildsToStop.txt
+