[snapcraft] stop using soon-to-be deprecated version-script

snap/snapcraft.yaml

@@ -1,20 +1,10 @@
 name: fluxctl
-version-script: |
-  FLUX_TAG="$(git tag -l | egrep -v '^(chart-|helm-|master-|pre-split)' | sort --version-sort | tail -n1)"
-  if [ "$SNAPCRAFT_PROJECT_GRADE" = "stable" ]
-  then
-    echo "$FLUX_TAG"
-  else
-    GIT_REV="$(git rev-parse --short HEAD)"
-    echo "$FLUX_TAG+$GIT_REV"
-  fi
-version: git
 summary: fluxctl talks to Flux and helps you deploy your code
 description: |
   fluxctl talks to your Flux instance and exposes all its
   functionality to an easy to use command line interface.
-grade: devel # must be 'stable' to release into candidate/stable channels
 confinement: strict
+adopt-info: fluxctl
 base: core18
 
 parts:
@@ -30,10 +20,26 @@ parts:
       snapcraftctl stage
   fluxctl:
     source: .
+    override-pull: |
+      snapcraftctl pull
+      FLUX_TAG="$(git tag -l | egrep -v '^(chart-|helm-|master-|pre-split)' | sort --version-sort | tail -n1)"
+      set +e
+      git describe --exact-match --tags $(git log -n1 --pretty='%h')
+      retVal=$?
+      set -e
+      if [ $retVal -eq 0 ]; then
+        snapcraftctl set-version "$FLUX_TAG"
+        snapcraftctl set-grade stable
+      else
+        GIT_REV="$(git rev-parse --short HEAD)"
+        snapcraftctl set-version "$FLUX_TAG+$GIT_REV"
+        snapcraftctl set-grade devel
+      fi
     plugin: go
     go-importpath: github.com/weaveworks/flux
     build-packages:
       - gcc
+      - git
     stage:
       - -bin/fluxd
       - -bin/helm-operator