From f09f984d39fc058fc3fdb98a696581e63f5b3c3f Mon Sep 17 00:00:00 2001
From: Ed Tan <edward.tan1@gmail.com>
Date: Sun, 9 Dec 2018 14:12:25 -0500
Subject: [PATCH] Use GNU date to parse timezone offsets

---
 Dockerfile    |  4 +++-
 scripts/check | 10 ++++++----
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index fd53295..6e91a28 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,6 @@
-FROM concourse/buildroot:git
+FROM alpine:3.8
+
+RUN apk --no-cache add openssh-client bash curl git jq coreutils
 
 COPY scripts/ /opt/resource/
 RUN chmod +x /opt/resource/*
diff --git a/scripts/check b/scripts/check
index 09484de..1f74e4c 100755
--- a/scripts/check
+++ b/scripts/check
@@ -39,8 +39,9 @@ fi
 
 version_updated_at=0
 if [ ! -z "${version_sha}" ]; then
-    version_updated_at="$(curl -s -H "private-token: ${private_token}" "${protocol}://${gitlab_host}/api/v4/projects/$(urlencode "${project_path}")/repository/commits/${version_sha}" \
-        | jq '.committed_date|.[:19]|strptime("%Y-%m-%dT%H:%M:%S")|mktime')"
+    gitlab_committed_date="$(curl -s -H "private-token: ${private_token}" "${protocol}://${gitlab_host}/api/v4/projects/$(urlencode "${project_path}")/repository/commits/${version_sha}" \
+        | jq -r '.committed_date')"
+    version_updated_at=$(date -d "$gitlab_committed_date" +%s)
 fi
 
 open_mrs="$(curl -s -H "private-token: ${private_token}" "${protocol}://${gitlab_host}/api/v4/projects/$(urlencode "${project_path}")/merge_requests?state=opened&order_by=updated_at")"
@@ -52,8 +53,9 @@ for i in $(seq 0 $((num_mrs - 1))); do
     mr="$(echo "${open_mrs}" | jq -r '.['"$i"']')"
     mr_sha="$(echo "${mr}" | jq -r '.sha')"
     if [ "${mr_sha}" != "null" ]; then
-        mr_updated_at="$(curl -s -H "private-token: ${private_token}" "${protocol}://${gitlab_host}/api/v4/projects/$(urlencode "${project_path}")/repository/commits/${mr_sha}" \
-            | jq '.committed_date|.[:19]|strptime("%Y-%m-%dT%H:%M:%S")|mktime')"
+        gitlab_committed_date="$(curl -s -H "private-token: ${private_token}" "${protocol}://${gitlab_host}/api/v4/projects/$(urlencode "${project_path}")/repository/commits/${mr_sha}" \
+            | jq -r '.committed_date')"
+        mr_updated_at=$(date -d "$gitlab_committed_date" +%s)
         if [ "${mr_updated_at}" -gt "${version_updated_at}" ] || [ -z "${version_sha}" ]; then
             new_versions="${new_versions},{\"sha\":\"${mr_sha}\"}"
         fi