Merge pull request #9601 from jwhonce/issues/9207

Use version package to track all versions

1 files changed, 35 insertions, 4 deletions

diff --git a/version/version.go b/version/version.go
index 520014bb7..6b93ed8ea 100644
--- a/version/version.go
+++ b/version/version.go
@@ -4,13 +4,44 @@ import (
 	"github.com/blang/semver"
 )
 
+type (
+	// Tree determines which API endpoint tree for version
+	Tree int
+	// Level determines which API level, current or something from the past
+	Level int
+)
+
+const (
+	// Libpod supports Libpod endpoints
+	Libpod = Tree(iota)
+	// Compat supports Libpod endpoints
+	Compat
+
+	// CurrentAPI announces what is the current API level
+	CurrentAPI = Level(iota)
+	// MinimalAPI announces what is the oldest API level supported
+	MinimalAPI
+)
+
 // Version is the version of the build.
 // NOTE: remember to bump the version at the top
 // of the top-level README.md file when this is
 // bumped.
 var Version = semver.MustParse("3.1.0-dev")
 
-// APIVersion is the version for the remote
-// client API.  It is used to determine compatibility
-// between a remote podman client and its backend
-var APIVersion = semver.MustParse("3.0.0")
+// See https://docs.docker.com/engine/api/v1.40/
+// libpod compat handlers are expected to honor docker API versions
+
+// APIVersion provides the current and minimal API versions for compat and libpod endpoint trees
+// Note: GET|HEAD /_ping is never versioned and provides the API-Version and Libpod-API-Version headers to allow
+//       clients to shop for the Version they wish to support
+var APIVersion = map[Tree]map[Level]semver.Version{
+	Libpod: {
+		CurrentAPI: Version,
+		MinimalAPI: semver.MustParse("3.0.0"),
+	},
+	Compat: {
+		CurrentAPI: semver.MustParse("1.40.0"),
+		MinimalAPI: semver.MustParse("1.24.0"),
+	},
+}