Set uploadpack.allowFilter etc on gitconfig to enable partial clones with ssh

When setting.Git.DisablePartialClone is set to false then the
web server will add filter support to web http. It does this by using
`-c` command arguments but this will not work on gitea serv as the
upload-pack and receive-pack commands do not support this.

Instead we move these options into the .gitconfig instead.

Fix #20400

Signed-off-by: Andrew Thornton <art27@cantab.net>

Author: zeripath

modules/git/git.go

@@ -185,11 +185,6 @@ func InitFull(ctx context.Context) (err error) {
 		globalCommandArgs = append(globalCommandArgs, "-c", "protocol.version=2")
 	}
 
-	// By default partial clones are disabled, enable them from git v2.22
-	if !setting.Git.DisablePartialClone && CheckGitVersionAtLeast("2.22") == nil {
-		globalCommandArgs = append(globalCommandArgs, "-c", "uploadpack.allowfilter=true", "-c", "uploadpack.allowAnySHA1InWant=true")
-	}
-
 	// Explicitly disable credential helper, otherwise Git credentials might leak
 	if CheckGitVersionAtLeast("2.9") == nil {
 		globalCommandArgs = append(globalCommandArgs, "-c", "credential.helper=")
@@ -286,7 +281,20 @@ func syncGitConfig() (err error) {
 		}
 	}
 
-	return nil
+	// By default partial clones are disabled, enable them from git v2.22
+	if !setting.Git.DisablePartialClone && CheckGitVersionAtLeast("2.22") == nil {
+		if err = configSet("uploadpack.allowfilter", "true"); err != nil {
+			return err
+		}
+		err = configSet("uploadpack.allowAnySHA1InWant", "true")
+	} else {
+		if err = configUnsetAll("uploadpack.allowfilter", "true"); err != nil {
+			return err
+		}
+		err = configUnsetAll("uploadpack.allowAnySHA1InWant", "true")
+	}
+
+	return err
 }
 
 // CheckGitVersionAtLeast check git version is at least the constraint version