build, pkg/version: Embed the version from Meson into the binary

This removes the need to manually update the version in the Go source
code when making a release.

https://github.com/containers/toolbox/pull/487

src/go-build-wrapper

@@ -16,9 +16,9 @@
 #
 
 
-if [ "$#" -ne 2 ]; then
+if [ "$#" -ne 3 ]; then
     echo "go-build-wrapper: wrong arguments" >&2
-    echo "Usage: go-build-wrapper [SOURCE DIR] [OUTPUT DIR]" >&2
+    echo "Usage: go-build-wrapper [SOURCE DIR] [OUTPUT DIR] [VERSION]" >&2
     exit 1
 fi
 
@@ -27,5 +27,5 @@ if ! cd "$1"; then
     exit 1
 fi
 
-go build -o "$2"
+go build -ldflags "-X github.com/containers/toolbox/pkg/version.currentVersion=$3" -o "$2"
 exit "$?"

src/meson.build

@@ -22,7 +22,12 @@ sources = files(
 custom_target(
   'toolbox',
   build_by_default: true,
-  command: [go_build_wrapper_program, meson.current_source_dir(), meson.current_build_dir()],
+  command: [
+    go_build_wrapper_program,
+    meson.current_source_dir(),
+    meson.current_build_dir(),
+    meson.project_version(),
+  ],
   input: sources,
   install: true,
   install_dir: get_option('bindir'),

src/pkg/version/version.go

@@ -18,7 +18,7 @@ package version
 
 // currentVersion holds the information about current build version
 var (
-	currentVersion = "0.0.90"
+	currentVersion string
 )
 
 // GetVersion returns string with the version of Toolbox