snap: update tag and fix build with newer snapcraft version

snap/snapcraft.yaml

@@ -1,45 +1,56 @@
 name: cloudmonkey
-version: git
+# define the tag anchor on the allowed 'version' field
+version: &release_tag 6.4.0
 summary: Apache CloudStack CLI
 description: |
-  An CLI and interactive shell that simplifies configuration and management of
+  A CLI and interactive shell that simplifies configuration and management of
   Apache CloudStack, the opensource IAAS cloud computing platform.
 
-base: core18
+base: core22
 license: Apache-2.0
 grade: stable
 confinement: strict
+adopt-info: cloudmonkey
 
 apps:
   cloudmonkey:
     command: bin/cmk
-    plugs:
-    - home
-    - network
+    plugs: [home, network]
 
 parts:
   cloudmonkey:
-    source: .
-    source-type: git
-    source-tag: 6.1.0
     plugin: go
-    go-importpath: github.com/apache/cloudstack-cloudmonkey
-    build-packages:
-      - gcc
-      - make
-      - file
-      - git
+    source: &cmk_repo https://github.com/apache/cloudstack-cloudmonkey.git
+    source-type: git
+    source-tag: *release_tag
+    source-depth: 1
+
+    build-snaps: [go]
+    build-packages: [git, file, binutils]
+
+    build-environment:
+      - CMK_REPO: *cmk_repo
+      - CMK_TAG:  *release_tag
+
+    override-pull: |
+      set -euo pipefail
+      craftctl default
+      REPO="${CMK_REPO}"
+      TAG="${CMK_TAG}"
+      FULL_SHA="$(git ls-remote "${REPO}" "refs/tags/${TAG}" | awk '{print $1}')"
+      SHORT_SHA="${FULL_SHA:0:7}"
+      : "${SHORT_SHA:=unknown}"
+      echo "${SHORT_SHA}" > "$CRAFT_PART_SRC/.remote-sha"
+      craftctl set version="${TAG}-${SHORT_SHA}"
+
     override-build: |
-      set -eu
-      go version
-      go mod vendor
-      git checkout -- .
-      git status
-      git rev-parse HEAD
-      go build -mod=vendor -ldflags="-s -w -X main.GitSHA=$(git rev-parse --short HEAD) -X main.BuildDate=$(date +%FT%T%z)" -o cmk cmk.go
-      file cmk
-      chmod +x cmk
-      ./cmk -v
-      mkdir -p $SNAPCRAFT_PART_INSTALL/bin
-      mv cmk $SNAPCRAFT_PART_INSTALL/bin/
-      strip --remove-section=.comment --remove-section=.note $SNAPCRAFT_PART_INSTALL/bin/cmk
+      set -euo pipefail
+      cd "$CRAFT_PART_SRC"
+      SHORT_SHA="$(cat .remote-sha 2>/dev/null || echo unknown)"
+      BUILD_DATE="$(date +%FT%T%z)"
+      go mod vendor || true
+      go build -trimpath \
+        -ldflags "-s -w -X main.GitSHA=${SHORT_SHA} -X main.BuildDate=${BUILD_DATE}" \
+        -o cmk cmk.go
+      install -Dm0755 cmk "$CRAFT_PART_INSTALL/bin/cmk"
+      strip --remove-section=.comment --remove-section=.note "$CRAFT_PART_INSTALL/bin/cmk" || true