Add automatic version detection from Saoneth:master (dtschan#1)

Author: bdurrow

build.sh

@@ -1,28 +1,36 @@
 #!/bin/sh
 
-VERSION=7.66.0
-TARBALL_FILENAME=curl-${VERSION}.tar.xz
-TARBALL_PATH=/out/${TARBALL_FILENAME}
-FINAL_BIN_PATH=/out/curl
-URL=https://curl.haxx.se/download/${TARBALL_FILENAME}
+
+VERSION=LATEST
+#If you prefer a specific version you can set it specifically
+#VERSION=7.66.0
 cat <<EOF | docker run -i --rm -v "$PWD":/out -w /root alpine /bin/sh -eus
 trap 'RC="\$?"; echo "***FAILED! RC=\${RC}"; exit \${RC}' EXIT
+if [ "$VERSION" = 'LATEST' ]; then
+  TARBALL_FILENAME=\$(wget https://curl.haxx.se/download/ -q -O- | grep -o 'curl-.*\.tar\.xz"' | sort -rn | head -n1 | sed 's/"$//')
+else
+  TARBALL_FILENAME=curl-${VERSION}.tar.xz
+fi
+URL=https://curl.haxx.se/download/\${TARBALL_FILENAME}
+TARBALL_PATH=/out/\${TARBALL_FILENAME}
+FINAL_BIN_PATH=/out/curl
+echo "Building \${TARBALL_FILENAME}..."
 apk add gcc make musl-dev openssl-dev
-if [ -e ${TARBALL_PATH} ]; then 
-  echo "Found existing ${TARBALL_FILENAME}; reusing..."
+if [ -e \${TARBALL_PATH} ]; then 
+  echo "Found existing \${TARBALL_FILENAME}; reusing..."
 else 
-  echo "Fetching ${URL}..."
-  wget ${URL} -O ${TARBALL_PATH}
+  echo "Fetching \${URL}..."
+  wget \${URL} -O \${TARBALL_PATH}
 fi
-tar xfJ ${TARBALL_PATH}
+tar xfJ \${TARBALL_PATH}
 cd curl-*
 ./configure --disable-shared --with-ca-fallback
 make curl_LDFLAGS=-all-static 
 make install
-cp /usr/local/bin/curl ${FINAL_BIN_PATH}
-strip ${FINAL_BIN_PATH}
-chown $(id -u):$(id -g) ${FINAL_BIN_PATH}
+cp /usr/local/bin/curl \${FINAL_BIN_PATH}
+strip \${FINAL_BIN_PATH}
+chown $(id -u):$(id -g) \${FINAL_BIN_PATH}
 trap - EXIT
 echo SUCCESS
-ls -l ${FINAL_BIN_PATH}
+ls -l \${FINAL_BIN_PATH}
 EOF