git-version: script detection of git tag/commit

build

@@ -25,7 +25,7 @@ mkdir -p $GOPATH/src/github.com/coreos/
 # Only attempt to link dex into godeps if it isn't already there
 [ -d $GOPATH/src/github.com/coreos/dex ] || ln -s ${PWD} $GOPATH/src/github.com/coreos/dex
 
-LD_FLAGS="-X main.version=$(git rev-parse HEAD)"
+LD_FLAGS="-X main.version=$(./git-version)"
 go build -o bin/dex-worker -ldflags="$LD_FLAGS" github.com/coreos/dex/cmd/dex-worker
 go build -o bin/dexctl github.com/coreos/dex/cmd/dexctl
 go build -o bin/dex-overlord -ldflags="$LD_FLAGS" github.com/coreos/dex/cmd/dex-overlord

build-docker-push

@@ -12,9 +12,9 @@ else
     docker login --username="$DOCKER_USER" --password="$DOCKER_PASSWORD" --email="dex@example.com" $DOCKER_REGISTRY
 fi
 
-git_sha=$(git rev-parse HEAD)
+version=$(./git-version)
 
-docker build -q --rm=true -t $repo:$git_sha .
-docker tag -f $repo:$git_sha $repo:latest
-docker push $repo:$git_sha
+docker build -q --rm=true -t $repo:$version .
+docker tag -f $repo:$version $repo:latest
+docker push $repo:$version
 docker push $repo:latest

git-version

@@ -0,0 +1,21 @@
+#!/bin/bash -e
+
+# pull the current git commit hash
+COMMIT=`git rev-parse HEAD`
+
+# check if the current commit has a matching tag
+TAG=$(git describe --exact-match --abbrev=0 --tags ${COMMIT} 2> /dev/null || true)
+
+# use the matching tag as the version, if available
+if [ -z "$TAG" ]; then
+	VERSION=$COMMIT
+else
+	VERSION=$TAG
+fi
+
+# check for changed files (not untracked files)
+if [ -n "$(git diff --shortstat 2> /dev/null | tail -n1)" ]; then
+	VERSION="${VERSION}+dirty"
+fi
+
+echo $VERSION