fix: Add chattr +remove support for files

Resolves: #3282

Author: halostatue

internal/cmd/chattrcmd.go

@@ -560,6 +560,11 @@ func (m *modifier) modifyFileAttr(fileAttr chezmoi.FileAttr) chezmoi.FileAttr {
 			Type:       chezmoi.SourceFileTypeSymlink,
 			Template:   m.template.modify(fileAttr.Template),
 		}
+	case chezmoi.SourceFileTypeRemove:
+		return chezmoi.FileAttr{
+			TargetName: fileAttr.TargetName,
+			Type:       chezmoi.SourceFileTypeRemove,
+		}
 	default:
 		panic(fmt.Sprintf("%d: unknown source file type", fileAttr.Type))
 	}

internal/cmd/testdata/scripts/chattr.txtar

@@ -6,6 +6,16 @@ exec chezmoi chattr empty $HOME${/}.file
 ! exists $CHEZMOISOURCEDIR/dot_file
 exists $CHEZMOISOURCEDIR/empty_dot_file
 
+# test that chezmoi chattr remove sets the remove attribute on a file
+exec chezmoi chattr remove $HOME${/}.file
+! exists $CHEZMOISOURCEDIR/empty_dot_file
+exists $CHEZMOISOURCEDIR/remove_dot_file
+
+# test that chezmoi chattr noremove removes the remove attribute on a file
+exec chezmoi chattr noremove,empty $HOME${/}.file
+! exists $CHEZMOISOURCEDIR/remove_dot_file
+exists $CHEZMOISOURCEDIR/empty_dot_file
+
 # test that chezmoi attr +p sets the private attribute on a file
 exec chezmoi chattr +p $HOME${/}.file
 ! exists $CHEZMOISOURCEDIR/empty_dot_file