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

2 files changed, 22 insertions, 0 deletions

diff --git a/pkg/host/machine_info.go b/pkg/host/machine_info.go
index a804ca32a..167b7ec03 100644
--- a/pkg/host/machine_info.go
+++ b/pkg/host/machine_info.go
@@ -38,8 +38,16 @@ func CollectModulesInfo() ([]KernelModule, error) {
 	return machineModulesInfo()
 }
 
+func CollectGlobsInfo(globs []string) (map[string][]string, error) {
+	if machineModulesInfo == nil {
+		return nil, nil
+	}
+	return machineGlobsInfo(globs)
+}
+
 var machineInfoFuncs []machineInfoFunc
 var machineModulesInfo func() ([]KernelModule, error)
+var machineGlobsInfo func([]string) (map[string][]string, error)
 
 type machineInfoFunc struct {
 	name string
diff --git a/pkg/host/machine_info_linux.go b/pkg/host/machine_info_linux.go
index 317d34cd9..3b0971495 100644
--- a/pkg/host/machine_info_linux.go
+++ b/pkg/host/machine_info_linux.go
@@ -21,6 +21,7 @@ func init() {
 		{"KVM", readKVMInfo},
 	}
 	machineModulesInfo = getModulesInfo
+	machineGlobsInfo = getGlobsInfo
 }
 
 func readCPUInfo(buffer *bytes.Buffer) error {
@@ -140,3 +141,16 @@ func getModulesInfo() ([]KernelModule, error) {
 	}
 	return modules, nil
 }
+
+func getGlobsInfo(globs []string) (map[string][]string, error) {
+	files := make(map[string][]string, len(globs))
+	for _, glob := range globs {
+		matches, err := filepath.Glob(glob)
+		if err != nil {
+			return nil, err
+		}
+		files[glob] = matches
+	}
+
+	return files, nil
+}