Lint comments (prometheus#422)

* Add `godot` linter to validate comments.
* Clenup a bunch of comments.
* Replace deprecated golint with revive.

Signed-off-by: SuperQ <superq@gmail.com>

.golangci.yml

@@ -1,4 +1,12 @@
 ---
 linters:
   enable:
-  - golint
+  - godot
+  - revive
+
+linter-settings:
+  godot:
+    capital: true
+    exclude:
+    # Ignore "See: URL"
+    - 'See:'

arp.go

@@ -21,19 +21,19 @@ import (
 	"strings"
 )
 
-// Learned from include/uapi/linux/if_arp.h
+// Learned from include/uapi/linux/if_arp.h.
 const (
-	// completed entry (ha valid)
+	// completed entry (ha valid).
 	ATFComplete = 0x02
-	// permanent entry
+	// permanent entry.
 	ATFPermanent = 0x04
-	// Publish entry
+	// Publish entry.
 	ATFPublish = 0x08
-	// Has requested trailers
+	// Has requested trailers.
 	ATFUseTrailers = 0x10
-	// Obsoleted: Want to use a netmask (only for proxy entries)
+	// Obsoleted: Want to use a netmask (only for proxy entries).
 	ATFNetmask = 0x20
-	// Don't answer this addresses
+	// Don't answer this addresses.
 	ATFDontPublish = 0x40
 )
 
@@ -110,7 +110,7 @@ func parseARPEntry(columns []string) (ARPEntry, error) {
 	return entry, nil
 }
 
-// IsComplete returns true if ARP entry is marked with complete flag
+// IsComplete returns true if ARP entry is marked with complete flag.
 func (entry *ARPEntry) IsComplete() bool {
 	return entry.Flags&ATFComplete != 0
 }

bcache/bcache.go

@@ -29,7 +29,7 @@ type Stats struct {
 }
 
 // BcacheStats contains statistics tied to a bcache ID.
-type BcacheStats struct { // nolint:golint
+type BcacheStats struct { // nolint:revive
 	AverageKeySize        uint64
 	BtreeCacheSize        uint64
 	CacheAvailablePercent uint64

bcache/get.go

@@ -51,8 +51,8 @@ func NewFS(mountPoint string) (FS, error) {
 	return FS{&fs}, nil
 }
 
-// Stats is a wrapper around stats()
-// It returns full available statistics
+// Stats is a wrapper around stats().
+// It returns full available statistics.
 func (fs FS) Stats() ([]*Stats, error) {
 	return fs.stats(true)
 }

blockdevice/stats.go

@@ -25,17 +25,17 @@ import (
 	"github.com/prometheus/procfs/internal/fs"
 )
 
-// Info contains identifying information for a block device such as a disk drive
+// Info contains identifying information for a block device such as a disk drive.
 type Info struct {
 	MajorNumber uint32
 	MinorNumber uint32
 	DeviceName  string
 }
 
-// IOStats models the iostats data described in the kernel documentation
-// https://www.kernel.org/doc/Documentation/iostats.txt,
-// https://www.kernel.org/doc/Documentation/block/stat.txt,
-// and https://www.kernel.org/doc/Documentation/ABI/testing/procfs-diskstats
+// IOStats models the iostats data described in the kernel documentation.
+// - https://www.kernel.org/doc/Documentation/iostats.txt,
+// - https://www.kernel.org/doc/Documentation/block/stat.txt
+// - https://www.kernel.org/doc/Documentation/ABI/testing/procfs-diskstats
 type IOStats struct {
 	// ReadIOs is the number of reads completed successfully.
 	ReadIOs uint64
@@ -76,7 +76,7 @@ type IOStats struct {
 	TimeSpentFlushing uint64
 }
 
-// Diskstats combines the device Info and IOStats
+// Diskstats combines the device Info and IOStats.
 type Diskstats struct {
 	Info
 	IOStats
@@ -220,7 +220,7 @@ func NewFS(procMountPoint string, sysMountPoint string) (FS, error) {
 }
 
 // ProcDiskstats reads the diskstats file and returns
-// an array of Diskstats (one per line/device)
+// an array of Diskstats (one per line/device).
 func (fs FS) ProcDiskstats() ([]Diskstats, error) {
 	file, err := os.Open(fs.proc.Path(procDiskstatsPath))
 	if err != nil {
@@ -266,7 +266,7 @@ func (fs FS) ProcDiskstats() ([]Diskstats, error) {
 	return diskstats, scanner.Err()
 }
 
-// SysBlockDevices lists the device names from /sys/block/<dev>
+// SysBlockDevices lists the device names from /sys/block/<dev>.
 func (fs FS) SysBlockDevices() ([]string, error) {
 	deviceDirs, err := ioutil.ReadDir(fs.sys.Path(sysBlockPath))
 	if err != nil {

btrfs/get.go

@@ -80,7 +80,7 @@ func (fs FS) Stats() ([]*Stats, error) {
 	return stats, nil
 }
 
-// GetStats collects all Btrfs statistics from sysfs
+// GetStats collects all Btrfs statistics from sysfs.
 func GetStats(uuidPath string) (*Stats, error) {
 	r := &reader{path: uuidPath}
 	s := r.readFilesystemStats()
@@ -162,7 +162,7 @@ func (r *reader) readAllocationStats(d string) (a *AllocationStats) {
 	return
 }
 
-// readLayouts reads all Btrfs layout statistics for the current path
+// readLayouts reads all Btrfs layout statistics for the current path.
 func (r *reader) readLayouts() map[string]*LayoutUsage {
 	files, err := ioutil.ReadDir(r.path)
 	if err != nil {

cpuinfo.go

@@ -27,7 +27,7 @@ import (
 	"github.com/prometheus/procfs/internal/util"
 )
 
-// CPUInfo contains general information about a system CPU found in /proc/cpuinfo
+// CPUInfo contains general information about a system CPU found in /proc/cpuinfo.
 type CPUInfo struct {
 	Processor       uint
 	VendorID        string
@@ -469,7 +469,7 @@ func parseCPUInfoDummy(_ []byte) ([]CPUInfo, error) { // nolint:unused,deadcode
 }
 
 // firstNonEmptyLine advances the scanner to the first non-empty line
-// and returns the contents of that line
+// and returns the contents of that line.
 func firstNonEmptyLine(scanner *bufio.Scanner) string {
 	for scanner.Scan() {
 		line := scanner.Text()

internal/fs/fs.go

@@ -26,7 +26,7 @@ const (
 	// DefaultSysMountPoint is the common mount point of the sys filesystem.
 	DefaultSysMountPoint = "/sys"
 
-	// DefaultConfigfsMountPoint is the common mount point of the configfs
+	// DefaultConfigfsMountPoint is the common mount point of the configfs.
 	DefaultConfigfsMountPoint = "/sys/kernel/config"
 )
 

iscsi/get.go

@@ -26,8 +26,8 @@ import (
 	"github.com/prometheus/procfs/internal/util"
 )
 
-// GetStats is the main iscsi status information func
-// building the path and prepare info for enable iscsi
+// GetStats is the main iscsi status information func for
+// building the path and prepare info for enable iscsi.
 func GetStats(iqnPath string) (*Stats, error) {
 	var istats Stats
 
@@ -58,8 +58,7 @@ func GetStats(iqnPath string) (*Stats, error) {
 	return &istats, nil
 }
 
-// isPathEnable is a utility function
-// check if the file "enable" contain enable message
+// isPathEnable checks if the file "enable" contain enable message.
 func isPathEnable(path string) (bool, error) {
 	enableReadout, err := ioutil.ReadFile(filepath.Join(path, "enable"))
 	if err != nil {
@@ -104,7 +103,7 @@ func getLunLinkTarget(lunPath string) (lunObject LUN, err error) {
 }
 
 // ReadWriteOPS read and return the stat of read and write in megabytes,
-// and total commands that send to the target
+// and total commands that send to the target.
 func ReadWriteOPS(iqnPath string, tpgt string, lun string) (readmb uint64,
 	writemb uint64, iops uint64, err error) {
 
@@ -133,7 +132,7 @@ func ReadWriteOPS(iqnPath string, tpgt string, lun string) (readmb uint64,
 }
 
 // GetFileioUdev is getting the actual info to build up
-// the FILEIO data and match with the enable target
+// the FILEIO data and match with the enable target.
 func (fs FS) GetFileioUdev(fileioNumber string, objectName string) (*FILEIO, error) {
 	fileio := FILEIO{
 		Name:       "fileio_" + fileioNumber,
@@ -155,7 +154,7 @@ func (fs FS) GetFileioUdev(fileioNumber string, objectName string) (*FILEIO, err
 }
 
 // GetIblockUdev is getting the actual info to build up
-// the IBLOCK data and match with the enable target
+// the IBLOCK data and match with the enable target.
 func (fs FS) GetIblockUdev(iblockNumber string, objectName string) (*IBLOCK, error) {
 	iblock := IBLOCK{
 		Name:       "iblock_" + iblockNumber,
@@ -177,7 +176,7 @@ func (fs FS) GetIblockUdev(iblockNumber string, objectName string) (*IBLOCK, err
 }
 
 // GetRBDMatch is getting the actual info to build up
-// the RBD data and match with the enable target
+// the RBD data and match with the enable target.
 func (fs FS) GetRBDMatch(rbdNumber string, poolImage string) (*RBD, error) {
 	rbd := RBD{
 		Name:    "rbd_" + rbdNumber,
@@ -222,7 +221,7 @@ func (fs FS) GetRBDMatch(rbdNumber string, poolImage string) (*RBD, error) {
 	return nil, nil
 }
 
-// GetRDMCPPath is getting the actual info to build up RDMCP data
+// GetRDMCPPath is getting the actual info to build up RDMCP data.
 func (fs FS) GetRDMCPPath(rdmcpNumber string, objectName string) (*RDMCP, error) {
 	rdmcp := RDMCP{
 		Name:       "rd_mcp_" + rdmcpNumber,

iscsi/iscsi.go

@@ -23,21 +23,19 @@ import (
 
 // iscsi target started with /sys/kernel/config/target/iscsi/iqn*
 // configfs + target/iscsi/iqn*
-// iqnGlob is representing all the possible IQN
+// iqnGlob is representing all the possible IQN.
 const iqnGlob = "target/iscsi/iqn*"
 
 // targetCore static path /sys/kernel/config/target/core for node_exporter
-// reading runtime status
+// reading runtime status.
 const targetCore = "target/core"
 
 // devicePath static path /sys/devices/rbd/[0-9]* for rbd devices to
-// read at runtime status
+// read at runtime status.
 const devicePath = "devices/rbd"
 
 // FS represents the pseudo-filesystem configfs, which provides an interface to
-// iscsi kernel data structures in
-// sysfs	as /sys
-// configfs as /sys/kernel/config
+// iscsi kernel data structures in sysfs as /sys and configfs as /sys/kernel/config.
 type FS struct {
 	sysfs    *fs.FS
 	configfs *fs.FS
@@ -46,7 +44,7 @@ type FS struct {
 // NewFS returns a new configfs mounted under the given mount point. It will
 // error and return empty FS if the mount point can't be read. For the ease of
 // use, an empty string parameter configfsMountPoint will call internal fs for
-// the default sys path as /sys/kernel/config
+// the default sys path as /sys/kernel/config.
 func NewFS(sysfsPath string, configfsMountPoint string) (FS, error) {
 	if strings.TrimSpace(sysfsPath) == "" {
 		sysfsPath = fs.DefaultSysMountPoint
@@ -65,12 +63,12 @@ func NewFS(sysfsPath string, configfsMountPoint string) (FS, error) {
 	return FS{&sysfs, &configfs}, nil
 }
 
-// helper function to get configfs path
+// Path is a helper function to get configfs path.
 func (fs FS) Path(p ...string) string {
 	return fs.configfs.Path(p...)
 }
 
-// ISCSIStats getting iscsi runtime information
+// ISCSIStats getting iscsi runtime information.
 func (fs FS) ISCSIStats() ([]*Stats, error) {
 	matches, err := filepath.Glob(fs.configfs.Path(iqnGlob))
 	if err != nil {
@@ -90,15 +88,15 @@ func (fs FS) ISCSIStats() ([]*Stats, error) {
 	return stats, nil
 }
 
-// TPGT struct for sys target portal group tag info
+// TPGT struct for sys target portal group tag info.
 type TPGT struct {
 	Name     string // name of the tpgt group
 	TpgtPath string // file path of tpgt
 	IsEnable bool   // is the tpgt enable
 	Luns     []LUN  // the Luns that tpgt has
 }
 
-// LUN struct for sys logical unit number info
+// LUN struct for sys logical unit number info.
 type LUN struct {
 	Name       string // name of the lun
 	LunPath    string // file path of the lun
@@ -107,37 +105,37 @@ type LUN struct {
 	TypeNumber string // place holder for number of the device
 }
 
-// FILEIO struct for backstore info
+// FILEIO struct for backstore info.
 type FILEIO struct {
 	Name       string // name of the fileio
 	Fnumber    string // number related to the backstore
 	ObjectName string // place holder for object in iscsi object
 	Filename   string // link to the actual file being export
 }
 
-// IBLOCK struct for backstore info
+// IBLOCK struct for backstore info.
 type IBLOCK struct {
 	Name       string // name of the iblock
 	Bnumber    string // number related to the backstore
 	ObjectName string // place holder for object in iscsi object
 	Iblock     string // link to the actual block being export
 }
 
-// RBD struct for backstore info
+// RBD struct for backstore info.
 type RBD struct {
 	Name    string // name of the rbd
 	Rnumber string // number related to the backstore
 	Pool    string // place holder for the rbd pool
 	Image   string // place holder for the rbd image
 }
 
-// RDMCP struct for backstore info
+// RDMCP struct for backstore info.
 type RDMCP struct {
 	Name       string // name of the rdm_cp
 	ObjectName string // place holder for object name
 }
 
-// Stats struct for all targets info
+// Stats struct for all targets info.
 type Stats struct {
 	Name     string
 	Tpgt     []TPGT

loadavg.go

@@ -21,7 +21,7 @@ import (
 	"github.com/prometheus/procfs/internal/util"
 )
 
-// LoadAvg represents an entry in /proc/loadavg
+// LoadAvg represents an entry in /proc/loadavg.
 type LoadAvg struct {
 	Load1  float64
 	Load5  float64