From cc9245a043a78d66148e337eb6add15e7a8569a8 Mon Sep 17 00:00:00 2001
From: Sven Lechner <SirWindfield@users.noreply.github.com>
Date: Fri, 30 Aug 2019 19:49:35 +0200
Subject: [PATCH] feat(docker): add ability to always download latest or
 specific docker version

---
 Dockerfile | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index da160b3..e66d6da 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,11 +9,26 @@ LABEL "repository"="https://github.com/peaceiris/actions-hugo"
 LABEL "homepage"="https://github.com/peaceiris/actions-hugo"
 LABEL "maintainer"="peaceiris"
 
-ENV HUGO_VERSION='0.57.2'
-ENV HUGO_NAME="hugo_extended_${HUGO_VERSION}_Linux-64bit"
-ENV HUGO_URL="https://github.com/gohugoio/hugo/releases/download/v${HUGO_VERSION}/${HUGO_NAME}.tar.gz"
-RUN wget "${HUGO_URL}" && \
-    tar -zxvf "${HUGO_NAME}.tar.gz" && \
+ARG HUGO_VERSION="auto"
+RUN echo "Hugo version: ${HUGO_VERSION}"
+
+RUN if [ "$HUGO_VERSION" = "auto" ]; then \
+    echo "Using automated version detection" && \
+    curl -s https://api.github.com/repos/gohugoio/hugo/releases/latest | \
+    grep browser_download_url | \
+    cut -d '"' -f 4 | \
+    grep -e 'hugo_extended_.*_Linux.*\.tar\.gz' | \
+    xargs curl -fsSL -O; fi
+
+RUN if [ ! "$HUGO_VERSION" = "auto" ]; then \
+    echo "Using fixed version $HUGO_VERSION" && \
+    curl "https://api.github.com/repos/gohugoio/hugo/releases/tags/v${HUGO_VERSION}" | \
+    grep browser_download_url | \
+    cut -d '"' -f 4 | \
+    grep -e 'hugo_extended_.*_Linux.*\.tar\.gz' | \
+    xargs curl -fsSL -O; fi
+
+RUN cat *.gz | tar -xzvf - -i && \
     mv ./hugo /go/bin/
 
 ENTRYPOINT [ "/go/bin/hugo" ]