git: Implement test to check for object type filter support

With Git v2.32.0, a new filter has been added to git-rev-list(1) which
allows to filter by object type. We're about to start using this new
feature, but our minimum required Git version is still at v2.31.0. As
such, we can only conditionally make use of it.

Add a new function `SupportsObjectTypeFilter()` which allows callers to
see whether a specific Git version supports the feature. This function
will be used by a subsequent commit which implements object type filters
for LFS pointers.

2 files changed, 26 insertions, 0 deletions

diff --git a/internal/git/version.go b/internal/git/version.go
index db31701ea..cf5ca632d 100644
--- a/internal/git/version.go
+++ b/internal/git/version.go
@@ -74,6 +74,12 @@ func (v Version) IsSupported() bool {
 	return !v.LessThan(minimumVersion)
 }
 
+// SupportsObjectTypeFilter checks if a version corresponds to a Git version which supports object
+// type filters.
+func (v Version) SupportsObjectTypeFilter() bool {
+	return !v.LessThan(Version{major: 2, minor: 32, patch: 0})
+}
+
 // LessThan determines whether the version is older than another version.
 func (v Version) LessThan(other Version) bool {
 	switch {
diff --git a/internal/git/version_test.go b/internal/git/version_test.go
index 123f366cd..17b832ca1 100644
--- a/internal/git/version_test.go
+++ b/internal/git/version_test.go
@@ -130,3 +130,23 @@ func TestVersion_IsSupported(t *testing.T) {
 		})
 	}
 }
+
+func TestVersion_SupportsObjectTypeFilter(t *testing.T) {
+	for _, tc := range []struct {
+		version string
+		expect  bool
+	}{
+		{"2.31.0", false},
+		{"2.31.0-rc0", false},
+		{"2.31.1", false},
+		{"2.32.0", true},
+		{"2.32.1", true},
+		{"3.0.0", true},
+	} {
+		t.Run(tc.version, func(t *testing.T) {
+			version, err := parseVersion(tc.version)
+			require.NoError(t, err)
+			require.Equal(t, tc.expect, version.SupportsObjectTypeFilter())
+		})
+	}
+}