go.mod, vendor: update (#3358)

* go.mod, vendor: remove unnecessary dependencies

Commands:
1. go mod tidy
2. go mod vendor

* go.mod, vendor: update cloud.google.com/go

Commands:
1. go get -u cloud.google.com/go
2. go mod tidy
3. go mod vendor

* go.mod, vendor: update cloud.google.com/*

Commands:
1. go get -u cloud.google.com/storage cloud.google.com/logging
2. go mod tidy
3. go mod vendor

* go.mod, .golangci.yml, vendor: update *lint*

Commands:
1. go get -u golang.org/x/tools github.com/golangci/golangci-lint@v1.47.0
2. go mod tidy
3. go mod vendor
4. edit .golangci.yml to suppress new errors (resolved in the same PR later)

* all: fix lint errors

hash.go: copy() recommended by gosimple
parse.go: ent is never nil
verifier.go: signal.Notify() with unbuffered channel is bad. Have no idea why.

* .golangci.yml: adjust godot rules

check-all is deprecated, but still work
if you're hesitating too - I'll remove this commit

1 files changed, 89 insertions, 0 deletions

diff --git a/vendor/github.com/prometheus/procfs/swaps.go b/vendor/github.com/prometheus/procfs/swaps.go
new file mode 100644
index 000000000..15edc2212
--- /dev/null
+++ b/vendor/github.com/prometheus/procfs/swaps.go
@@ -0,0 +1,89 @@
+// Copyright 2019 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package procfs
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/prometheus/procfs/internal/util"
+)
+
+// Swap represents an entry in /proc/swaps.
+type Swap struct {
+	Filename string
+	Type     string
+	Size     int
+	Used     int
+	Priority int
+}
+
+// Swaps returns a slice of all configured swap devices on the system.
+func (fs FS) Swaps() ([]*Swap, error) {
+	data, err := util.ReadFileNoStat(fs.proc.Path("swaps"))
+	if err != nil {
+		return nil, err
+	}
+	return parseSwaps(data)
+}
+
+func parseSwaps(info []byte) ([]*Swap, error) {
+	swaps := []*Swap{}
+	scanner := bufio.NewScanner(bytes.NewReader(info))
+	scanner.Scan() // ignore header line
+	for scanner.Scan() {
+		swapString := scanner.Text()
+		parsedSwap, err := parseSwapString(swapString)
+		if err != nil {
+			return nil, err
+		}
+		swaps = append(swaps, parsedSwap)
+	}
+
+	err := scanner.Err()
+	return swaps, err
+}
+
+func parseSwapString(swapString string) (*Swap, error) {
+	var err error
+
+	swapFields := strings.Fields(swapString)
+	swapLength := len(swapFields)
+	if swapLength < 5 {
+		return nil, fmt.Errorf("too few fields in swap string: %s", swapString)
+	}
+
+	swap := &Swap{
+		Filename: swapFields[0],
+		Type:     swapFields[1],
+	}
+
+	swap.Size, err = strconv.Atoi(swapFields[2])
+	if err != nil {
+		return nil, fmt.Errorf("invalid swap size: %s", swapFields[2])
+	}
+	swap.Used, err = strconv.Atoi(swapFields[3])
+	if err != nil {
+		return nil, fmt.Errorf("invalid swap used: %s", swapFields[3])
+	}
+	swap.Priority, err = strconv.Atoi(swapFields[4])
+	if err != nil {
+		return nil, fmt.Errorf("invalid swap priority: %s", swapFields[4])
+	}
+
+	return swap, nil
+}