diff options
Diffstat (limited to 'vendor/github.com/prometheus/procfs/sysfs/fs.go')
-rw-r--r-- | vendor/github.com/prometheus/procfs/sysfs/fs.go | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/vendor/github.com/prometheus/procfs/sysfs/fs.go b/vendor/github.com/prometheus/procfs/sysfs/fs.go new file mode 100644 index 000000000..8e8380083 --- /dev/null +++ b/vendor/github.com/prometheus/procfs/sysfs/fs.go @@ -0,0 +1,82 @@ +// Copyright 2017 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 sysfs + +import ( + "fmt" + "os" + "path/filepath" + + "github.com/prometheus/procfs/xfs" +) + +// FS represents the pseudo-filesystem sys, which provides an interface to +// kernel data structures. +type FS string + +// DefaultMountPoint is the common mount point of the sys filesystem. +const DefaultMountPoint = "/sys" + +// NewFS returns a new FS mounted under the given mountPoint. It will error +// if the mount point can't be read. +func NewFS(mountPoint string) (FS, error) { + info, err := os.Stat(mountPoint) + if err != nil { + return "", fmt.Errorf("could not read %s: %s", mountPoint, err) + } + if !info.IsDir() { + return "", fmt.Errorf("mount point %s is not a directory", mountPoint) + } + + return FS(mountPoint), nil +} + +// Path returns the path of the given subsystem relative to the sys root. +func (fs FS) Path(p ...string) string { + return filepath.Join(append([]string{string(fs)}, p...)...) +} + +// XFSStats retrieves XFS filesystem runtime statistics for each mounted XFS +// filesystem. Only available on kernel 4.4+. On older kernels, an empty +// slice of *xfs.Stats will be returned. +func (fs FS) XFSStats() ([]*xfs.Stats, error) { + matches, err := filepath.Glob(fs.Path("fs/xfs/*/stats/stats")) + if err != nil { + return nil, err + } + + stats := make([]*xfs.Stats, 0, len(matches)) + for _, m := range matches { + f, err := os.Open(m) + if err != nil { + return nil, err + } + + // "*" used in glob above indicates the name of the filesystem. + name := filepath.Base(filepath.Dir(filepath.Dir(m))) + + // File must be closed after parsing, regardless of success or + // failure. Defer is not used because of the loop. + s, err := xfs.ParseStats(f) + _ = f.Close() + if err != nil { + return nil, err + } + + s.Name = name + stats = append(stats, s) + } + + return stats, nil +} |