Add optional error message to the error check

pkg/errorcheck/errorcheck.go

@@ -1,9 +1,21 @@
 package errorcheck
 
-import "log"
+import (
+	"log"
+)
 
-func ErrorCheck(err error) {
+func ErrorCheck(err error, message ...string) {
 	if err != nil {
-		log.Fatal(err.Error())
+		if len(message) != 0 {
+			// For each message we print a new line to stderr
+			for _, v := range message {
+				log.Println(v)
+			}
+			// Then write the exit code and exits
+			log.Fatal(err)
+		} else {
+			// Write the exit code and exit
+			log.Fatal(err)
+		}
 	}
 }

pkg/iommu/iommu.go

@@ -45,9 +45,9 @@ func (i *IOMMU) Read() {
 	i.Groups = make(map[int]*Group)
 	// Get all groups and associated devices
 	iommu_devices, err := filepath.Glob("/sys/kernel/iommu_groups/*/devices/*")
-	errorcheck.ErrorCheck(err)
+	errorcheck.ErrorCheck(err, "Unable to glob /sys/kernel/iommu_groups/*/devices/*")
 	pci, err := ghw.PCI(ghw.WithDisableWarnings())
-	errorcheck.ErrorCheck(err)
+	errorcheck.ErrorCheck(err, "Failed to parse PCI devices")
 
 	// Regex to get IOMMU groups and their devices from filepath
 	iommu_regex := regexp.MustCompile(`/sys/kernel/iommu_groups/(.*)/devices/(.*)`)
@@ -345,7 +345,7 @@ func MatchDEVs(regex string, pArg *params.Params) []string {
 
 	output := GetAllDevices(pArg)
 	gpuReg, err := regexp.Compile(regex)
-	errorcheck.ErrorCheck(err)
+	errorcheck.ErrorCheck(err, "Failed to compile MatchDEVs regex")
 
 	for _, line := range output {
 		if gpuReg.MatchString(line) {

pkg/iommu/rom.go

@@ -18,7 +18,7 @@ func GetRomPath(device *pci.Device, pArg *params.Params) []string {
 
 	// Walk through /sys/devices/ and add all paths that has a rom file and matches the device.Address to the roms variable
 	err := filepath.Walk("/sys/devices/", func(path string, info fs.FileInfo, err error) error {
-		errorcheck.ErrorCheck(err)
+		errorcheck.ErrorCheck(err, "Unable to walk /sys/devices/")
 
 		// If the file name is "rom" and the path contains the PCI address for our device
 		if info.Name() == "rom" && strings.Contains(path, device.Address) {
@@ -27,7 +27,7 @@ func GetRomPath(device *pci.Device, pArg *params.Params) []string {
 		}
 		return nil
 	})
-	errorcheck.ErrorCheck(err)
+	errorcheck.ErrorCheck(err, "Failed to walk /sys/devices/ to find the device rom")
 
 	// Return all found rom files
 	return roms