Fetch the checksum for the pre-built alpine binary at image update time.

Author: LaurentGoderre

10/alpine/Dockerfile

@@ -1,7 +1,5 @@
 FROM alpine:3.9
 
-ARG CHECKSUM=
-
 ENV NODE_VERSION 10.17.0
 
 RUN addgroup -g 1000 node \
@@ -12,8 +10,10 @@ RUN addgroup -g 1000 node \
         curl \
     && ARCH= && alpineArch="$(arch)" \
       && case "${alpineArch##*-}" in \
-        x86_64) ARCH='x64';; \
-        i386) ARCH='x86';; \
+        x86_64) \
+          ARCH='x64' \
+          CHECKSUM="f893a03c5b51e0c540e32cd52773221a2f9b6d575e7fe79ffe9e878483c703ff" \
+          ;; \
         *) ;; \
       esac \
   && if [ -n "${CHECKSUM}" ]; then \

12/alpine/Dockerfile

@@ -1,7 +1,5 @@
 FROM alpine:3.9
 
-ARG CHECKSUM=
-
 ENV NODE_VERSION 12.13.0
 
 RUN addgroup -g 1000 node \
@@ -12,8 +10,10 @@ RUN addgroup -g 1000 node \
         curl \
     && ARCH= && alpineArch="$(arch)" \
       && case "${alpineArch##*-}" in \
-        x86_64) ARCH='x64';; \
-        i386) ARCH='x86';; \
+        x86_64) \
+          ARCH='x64' \
+          CHECKSUM="f1c73636c4d345c4aefd65cc959f793d7bb795200d43e19e418d7811670b03dd" \
+          ;; \
         *) ;; \
       esac \
   && if [ -n "${CHECKSUM}" ]; then \

13/alpine/Dockerfile

@@ -1,7 +1,5 @@
 FROM alpine:3.10
 
-ARG CHECKSUM=
-
 ENV NODE_VERSION 13.0.1
 
 RUN addgroup -g 1000 node \
@@ -12,8 +10,10 @@ RUN addgroup -g 1000 node \
         curl \
     && ARCH= && alpineArch="$(arch)" \
       && case "${alpineArch##*-}" in \
-        x86_64) ARCH='x64';; \
-        i386) ARCH='x86';; \
+        x86_64) \
+          ARCH='x64' \
+          CHECKSUM="5f40392e14e81a566c06f4abcbe735575f2d7045709211eb7245ef8f67896bee" \
+          ;; \
         *) ;; \
       esac \
   && if [ -n "${CHECKSUM}" ]; then \

8/alpine/Dockerfile

@@ -1,7 +1,5 @@
 FROM alpine:3.9
 
-ARG CHECKSUM=
-
 ENV NODE_VERSION 8.16.2
 
 RUN addgroup -g 1000 node \
@@ -12,8 +10,10 @@ RUN addgroup -g 1000 node \
         curl \
     && ARCH= && alpineArch="$(arch)" \
       && case "${alpineArch##*-}" in \
-        x86_64) ARCH='x64';; \
-        i386) ARCH='x86';; \
+        x86_64) \
+          ARCH='x64' \
+          CHECKSUM="39276723f03e4adaa9f2eeded8653ca6b74d3df23ac70a3455a28c51f0cf0001" \
+          ;; \
         *) ;; \
       esac \
   && if [ -n "${CHECKSUM}" ]; then \

Dockerfile-alpine.template

@@ -1,7 +1,5 @@
 FROM alpine:0.0
 
-ARG CHECKSUM=
-
 ENV NODE_VERSION 0.0.0
 
 RUN addgroup -g 1000 node \
@@ -12,8 +10,10 @@ RUN addgroup -g 1000 node \
         curl \
     && ARCH= && alpineArch="$(arch)" \
       && case "${alpineArch##*-}" in \
-        x86_64) ARCH='x64';; \
-        i386) ARCH='x86';; \
+        x86_64) \
+          ARCH='x64' \
+          CHECKSUM=CHECKSUM_x64 \
+          ;; \
         *) ;; \
       esac \
   && if [ -n "${CHECKSUM}" ]; then \

update.sh

@@ -166,8 +166,14 @@ function update_node_version() {
       if [ "${SKIP}" = true ]; then
         # Get the currently used Alpine version
         alpine_version=$(grep "FROM" "${dockerfile}" | cut -d':' -f2)
+        checksum=$(grep -o "CHECKSUM=\".*\"" "${dockerfile}" | cut -d'=' -f2)
+      else
+        checksum="\"$(
+          curl -sSL --compressed "https://unofficial-builds.nodejs.org/download/release/v${nodeVersion}/SHASUMS256.txt" | grep "node-v${nodeVersion}-linux-x64-musl.tar.xz" | cut -d' ' -f1
+        )\""
       fi
       sed -Ei -e "s/(alpine:)0.0/\\1${alpine_version}/" "${dockerfile}-tmp"
+      sed -Ei -e "s/CHECKSUM=CHECKSUM_x64/CHECKSUM=${checksum}/" "${dockerfile}-tmp"
     elif is_debian "${variant}"; then
       sed -Ei -e "s/(buildpack-deps:)name/\\1${variant}/" "${dockerfile}-tmp"
     elif is_debian_slim "${variant}"; then