detecting a tagged version with no prerelease

Author: thefringeninja

build.sh

@@ -1,9 +1,41 @@
 #!/usr/bin/env bash
-DOCKERTAG=${TRAVIS_TAG:-latest}
 
-docker build \
-    --build-arg VERSION=$VERSION \
-    --build-arg MYGET_API_KEY=$MYGET_API_KEY \
-    --tag sql-stream-store-browser:${DOCKERTAG} .
+SEMVER_REGEX="^(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)(\\-[0-9A-Za-z-]+(\\.[0-9A-Za-z-]+)*)?(\\+[0-9A-Za-z-]+(\\.[0-9A-Za-z-]+)*)?$"
 
-docker images --filter=reference="sql-stream-store-browser:${DOCKERTAG}"
+[[ $VERSION =~ $SEMVER_REGEX ]]
+
+IMAGE="sql-stream-store-browser"
+MAJOR="${IMAGE}.${BASH_REMATCH[1]}"
+MAJOR_MINOR="${IMAGE}.${BASH_REMATCH[1]}.${BASH_REMATCH[2]}"
+MAJOR_MINOR_PATCH="${IMAGE}.${BASH_REMATCH[1]}.${BASH_REMATCH[2]}.${BASH_REMATCH[3]}"
+MAJOR_MINOR_PATCH_PRE="${IMAGE}.${BASH_REMATCH[1]}.${BASH_REMATCH[2]}.${BASH_REMATCH[3]}${BASH_REMATCH[4]}"
+LATEST="${IMAGE}:latest"
+if [[ -z $VERSION ]]
+then
+    echo "Detected no version information, assuming local build."
+    docker build \
+        --tag ${LATEST} \
+        .
+
+elif [[ $TRAVIS_TAG && -z ${BASH_REMATCH[4]} ]]
+then
+    echo "Detected a tag with no prerelease."
+    docker build \
+        --build-arg VERSION=$VERSION \
+        --build-arg MYGET_API_KEY=$MYGET_API_KEY \
+        --tag ${MAJOR} \
+        --tag ${MAJOR_MINOR} \
+        --tag ${MAJOR_MINOR_PATCH} \
+        --tag ${LATEST} \
+        .
+else
+    echo "Detected a prerelease."
+    docker build \
+        --build-arg VERSION=$VERSION \
+        --build-arg MYGET_API_KEY=$MYGET_API_KEY \
+        --tag ${MAJOR_MINOR_PATCH_PRE} \
+        --tag ${LATEST} \
+        .
+fi
+
+docker images --filter=reference="${LATEST}"