Implement tag versioning. (#84)

Special thanks @meeDamian.

.travis.yml

@@ -12,7 +12,14 @@ addons:
             - cpio
 env:
     global:
-        - VERSION=4.0.0-5
+        - MAJOR_VERSION=4
+        - MINOR_VERSION=0
+        - PATCH_VERSION=0
+        - RELEASE_VERSION=5
+        - VERSION=$MAJOR_VERSION.$MINOR_VERSION.$PATCH_VERSION-$RELEASE_VERSION
+        # Container tag version string.
+        # Set it here to give a flexibility of the value such as "vX.Y".
+        - TAG_VER=v$VERSION
         # See qemu-user-static's RPM spec file on Fedora to check the new version.
         # https://src.fedoraproject.org/rpms/qemu/blob/master/f/qemu.spec
         - DOCKER_SERVER=docker.io
@@ -33,7 +40,7 @@ script:
       if [[ $TRAVIS_BRANCH == 'master' && $TRAVIS_PULL_REQUEST == 'false' ]]; then
           ./publish.sh -v "$VERSION" -t "$GITHUB_TOKEN" -r "$REPO"
       fi
-    - ./update.sh -v "$VERSION" -r "$REPO" -d "$DOCKER_REPO"
+    - ./update.sh -v "$VERSION" -t "$TAG_VER" -r "$REPO" -d "$DOCKER_REPO"
     - docker images
     - ./test.sh -d "$DOCKER_REPO"
 after_success:

update.sh

@@ -4,12 +4,14 @@ set -xe
 # A POSIX variable
 OPTIND=1 # Reset in case getopts has been used previously in the shell.
 
-while getopts "r:v:d:" opt; do
+while getopts "r:v:t:d:" opt; do
     case "$opt" in
         r)  REPO=$OPTARG
         ;;
         v)  VERSION=$OPTARG
         ;;
+        t)  TAG_VER=$OPTARG
+        ;;
         d)  DOCKER_REPO=$OPTARG
         ;;
     esac
@@ -58,11 +60,16 @@ for to_arch in $to_archs; do
 FROM scratch
 COPY qemu-${to_arch}-static /usr/bin/
 EOF
-        docker build -t ${DOCKER_REPO}:$from_arch-$to_arch ${work_dir}
-        docker tag ${DOCKER_REPO}:$from_arch-$to_arch ${DOCKER_REPO}:$to_arch
+        docker build -t ${DOCKER_REPO}:$from_arch-$to_arch-${TAG_VER} ${work_dir}
+        for target in  "${DOCKER_REPO}:$from_arch-$to_arch" \
+            "${DOCKER_REPO}:$to_arch-${TAG_VER}" \
+            "${DOCKER_REPO}:$to_arch" ; do
+            docker tag ${DOCKER_REPO}:$from_arch-$to_arch-${TAG_VER} "${target}"
+        done
         rm -rf "${work_dir}"
     fi
 done
 
-docker build -t ${DOCKER_REPO}:latest "${out_dir}/latest"
+docker build -t ${DOCKER_REPO}:${TAG_VER} "${out_dir}/latest"
+docker tag ${DOCKER_REPO}:${TAG_VER} ${DOCKER_REPO}:latest
 docker build -t ${DOCKER_REPO}:register "${out_dir}/register"