Add Docker Hub build hooks

hooks/build

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+MYVARSFILE=imagevars.sh
+if [ -f ${MYVARSFILE}]; then
+    echo "Loading custom image name from file ${MYVARSFILE}"
+    . ${MYVARSFILE}
+fi
+
+docker build --build-arg FROM_IMAGE_NAME="${ALPINE_IMAGE_NAME}" -f $DOCKERFILE_PATH -t $IMAGE_NAME .

hooks/post_checkout

@@ -1,20 +1,37 @@
 #!/bin/bash
 
+# QEMU version variables
+QEMU_EXE=qemu-arm-static
+QEMU_VERSION=v4.0.0-2
+
+# download qemu
+# curl -L https://github.com/multiarch/qemu-user-static/releases/download/${QEMU_VERSION}/${QEMU_EXE}.tar.gz | tar zxvf - -C .
+
 # https://stackoverflow.com/questions/37935415/bash-regex-string-variable-match
 
-NEW_STRING="$1"
+NEW_STRING="${DOCKER_TAG}"
 
 REGEX="^([^-]+)-?([^-]+)?$"
+VARIANT_REGEX="(arm)(v[67])"
+FROM_IMAGE_NAME="alpine:latest"
 
 echo $NEW_STRING;
 
 [[ $NEW_STRING =~ $REGEX ]]
 MY_BRANCH="${BASH_REMATCH[1]}"
-MYVARIANT="${BASH_REMATCH[2]}"
+ARC_PART="${BASH_REMATCH[2]}"
 
-if [ -z $MYVARIANT ]; then
-    echo "Variant is empty"
+if [ -z $ARC_PART ]; then
+    echo "Architecture part is empty"
+else
+    [[ $ARC_PART =~ $VARIANT_REGEX ]]
+    ARCHITECTURE="${BASH_REMATCH[1]}"
+    ARC_VARIANT="${BASH_REMATCH[2]}"
+
+    echo "Branch: ${MY_BRANCH} . Architecture: ${ARCHITECTURE}, Variant: ${ARC_VARIANT}"
+    FROM_IMAGE_NAME="${ARCHITECTURE}32${ARC_VARIANT}/$FROM_IMAGE_NAME"
 fi
 
-echo "Branch: ${MY_BRANCH} . Variant: ${MYVARIANT}"
+echo "Image name: ${FROM_IMAGE_NAME}. Exporting it to ENV"
 
+echo "export ALPINE_IMAGE_NAME=${FROM_IMAGE_NAME}" > imagevars.sh

hooks/pre_build

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+
+# Register qemu-*-static for all supported processors except the 
+# current one, but also remove all registered binfmt_misc before
+
+docker run --rm --privileged multiarch/qemu-user-static:register --reset --credential yes