system: update doc commands and remove mutex

The mutex is not really doing anything, none of these methods make sense when called concurrently anyway. The copylocks analysis is still satisfied by the noCopy struct.

Signed-off-by: Ophestra <cat@gensokyo.uk>

system/tmpfiles.go

@@ -9,20 +9,16 @@ import (
 	"syscall"
 )
 
-// CopyFile registers an Op that copies from src.
-// A buffer is initialised with size cap and the Op faults if bytes read exceed n.
+// CopyFile appends [TmpfileOp] to [I].
 func (sys *I) CopyFile(payload *[]byte, src string, cap int, n int64) *I {
 	buf := new(bytes.Buffer)
 	buf.Grow(cap)
-
-	sys.lock.Lock()
-	sys.ops = append(sys.ops, &Tmpfile{payload, src, n, buf})
-	sys.lock.Unlock()
-
+	sys.ops = append(sys.ops, &TmpfileOp{payload, src, n, buf})
 	return sys
 }
 
-type Tmpfile struct {
+// TmpfileOp reads up to n bytes from src and writes the resulting byte slice to payload.
+type TmpfileOp struct {
 	payload *[]byte
 	src     string
 
@@ -30,8 +26,8 @@ type Tmpfile struct {
 	buf *bytes.Buffer
 }
 
-func (t *Tmpfile) Type() Enablement { return Process }
-func (t *Tmpfile) apply(*I) error {
+func (t *TmpfileOp) Type() Enablement { return Process }
+func (t *TmpfileOp) apply(*I) error {
 	msg.Verbose("copying", t)
 
 	if t.payload == nil {
@@ -59,12 +55,12 @@ func (t *Tmpfile) apply(*I) error {
 	*t.payload = t.buf.Bytes()
 	return nil
 }
-func (t *Tmpfile) revert(*I, *Criteria) error { t.buf.Reset(); return nil }
+func (t *TmpfileOp) revert(*I, *Criteria) error { t.buf.Reset(); return nil }
 
-func (t *Tmpfile) Is(o Op) bool {
-	t0, ok := o.(*Tmpfile)
-	return ok && t0 != nil &&
-		t.src == t0.src && t.n == t0.n
+func (t *TmpfileOp) Is(o Op) bool {
+	target, ok := o.(*TmpfileOp)
+	return ok && t != nil && target != nil &&
+		t.src == target.src && t.n == target.n
 }
-func (t *Tmpfile) Path() string   { return t.src }
-func (t *Tmpfile) String() string { return fmt.Sprintf("up to %d bytes from %q", t.n, t.src) }
+func (t *TmpfileOp) Path() string   { return t.src }
+func (t *TmpfileOp) String() string { return fmt.Sprintf("up to %d bytes from %q", t.n, t.src) }