pkg/compiler: add glob type

* all: add new typename dirname

The current way to check files under sysfs or proc is:
- define a string to represent each file
- open the file
- pass the fd to write / read / close

The issues above are:
- Need to know what file present on target device
- Need to write openat for each file

With dirname added, which will open one file
in the directory randomly and then pass the fd to
write/read/close.

* all: use typename glob to match filename

Fixes #481

1 files changed, 6 insertions, 0 deletions

diff --git a/prog/mutation.go b/prog/mutation.go
index af6a458f0..9d6dc2118 100644
--- a/prog/mutation.go
+++ b/prog/mutation.go
@@ -349,6 +349,12 @@ func (t *BufferType) mutate(r *randGen, s *state, arg Arg, ctx ArgCtx) (calls []
 		}
 	case BufferFilename:
 		a.data = []byte(r.filename(s, t))
+	case BufferGlob:
+		if len(t.Values) != 0 {
+			a.data = r.randString(s, t)
+		} else {
+			a.data = []byte(r.filename(s, t))
+		}
 	case BufferText:
 		data := append([]byte{}, a.Data()...)
 		a.data = r.mutateText(t.Text, data)