git: Add version check for the new `core.fsync` config option

Git v2.36.0 has introduced the new `core.fsync` infrastructure, which
allows the user more fine-grained control over what exactly should be
synchronized to disk. Add a function which allows us to check whether
this new infrastructure is supported by the current Git version.

2 files changed, 30 insertions, 0 deletions

diff --git a/internal/git/version.go b/internal/git/version.go
index 981dce5e1..8f4966347 100644
--- a/internal/git/version.go
+++ b/internal/git/version.go
@@ -84,6 +84,12 @@ func (v Version) FlushesUpdaterefStatus() bool {
 	})
 }
 
+// HasGranularFsyncConfig determines whether the given Git version supports the new granular fsync
+// configuration via `core.fsync`. This new config has been introduced with Git v2.36.0.
+func (v Version) HasGranularFsyncConfig() bool {
+	return !v.LessThan(Version{major: 2, minor: 36, rc: true})
+}
+
 // 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 55bbc0ff3..6fe8c89b8 100644
--- a/internal/git/version_test.go
+++ b/internal/git/version_test.go
@@ -147,3 +147,27 @@ func TestVersion_FlushesUpdaterefStatus(t *testing.T) {
 		})
 	}
 }
+
+func TestVersion_HasGranularFsyncConfig(t *testing.T) {
+	for _, tc := range []struct {
+		version string
+		expect  bool
+	}{
+		{"2.35.0", false},
+		{"2.35.0-rc0", false},
+		{"2.35.1", false},
+		{"2.35.1.gl3", false},
+		{"2.36.0-rc1", true},
+		{"2.36.0", true},
+		{"2.36.0.gl1", true},
+		{"2.36.1", true},
+		{"2.37.1", 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.HasGranularFsyncConfig())
+		})
+	}
+}