diff options
Diffstat (limited to 'vendor/go.uber.org/automaxprocs/internal/cgroups/mountpoint.go')
| -rw-r--r-- | vendor/go.uber.org/automaxprocs/internal/cgroups/mountpoint.go | 171 |
1 files changed, 0 insertions, 171 deletions
diff --git a/vendor/go.uber.org/automaxprocs/internal/cgroups/mountpoint.go b/vendor/go.uber.org/automaxprocs/internal/cgroups/mountpoint.go deleted file mode 100644 index f3877f78a..000000000 --- a/vendor/go.uber.org/automaxprocs/internal/cgroups/mountpoint.go +++ /dev/null @@ -1,171 +0,0 @@ -// Copyright (c) 2017 Uber Technologies, Inc. -// -// Permission is hereby granted, free of charge, to any person obtaining a copy -// of this software and associated documentation files (the "Software"), to deal -// in the Software without restriction, including without limitation the rights -// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell -// copies of the Software, and to permit persons to whom the Software is -// furnished to do so, subject to the following conditions: -// -// The above copyright notice and this permission notice shall be included in -// all copies or substantial portions of the Software. -// -// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR -// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, -// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE -// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER -// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, -// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN -// THE SOFTWARE. - -//go:build linux -// +build linux - -package cgroups - -import ( - "bufio" - "os" - "path/filepath" - "strconv" - "strings" -) - -const ( - _mountInfoSep = " " - _mountInfoOptsSep = "," - _mountInfoOptionalFieldsSep = "-" -) - -const ( - _miFieldIDMountID = iota - _miFieldIDParentID - _miFieldIDDeviceID - _miFieldIDRoot - _miFieldIDMountPoint - _miFieldIDOptions - _miFieldIDOptionalFields - - _miFieldCountFirstHalf -) - -const ( - _miFieldOffsetFSType = iota - _miFieldOffsetMountSource - _miFieldOffsetSuperOptions - - _miFieldCountSecondHalf -) - -const _miFieldCountMin = _miFieldCountFirstHalf + _miFieldCountSecondHalf - -// MountPoint is the data structure for the mount points in -// `/proc/$PID/mountinfo`. See also proc(5) for more information. -type MountPoint struct { - MountID int - ParentID int - DeviceID string - Root string - MountPoint string - Options []string - OptionalFields []string - FSType string - MountSource string - SuperOptions []string -} - -// NewMountPointFromLine parses a line read from `/proc/$PID/mountinfo` and -// returns a new *MountPoint. -func NewMountPointFromLine(line string) (*MountPoint, error) { - fields := strings.Split(line, _mountInfoSep) - - if len(fields) < _miFieldCountMin { - return nil, mountPointFormatInvalidError{line} - } - - mountID, err := strconv.Atoi(fields[_miFieldIDMountID]) - if err != nil { - return nil, err - } - - parentID, err := strconv.Atoi(fields[_miFieldIDParentID]) - if err != nil { - return nil, err - } - - for i, field := range fields[_miFieldIDOptionalFields:] { - if field == _mountInfoOptionalFieldsSep { - // End of optional fields. - fsTypeStart := _miFieldIDOptionalFields + i + 1 - - // Now we know where the optional fields end, split the line again with a - // limit to avoid issues with spaces in super options as present on WSL. - fields = strings.SplitN(line, _mountInfoSep, fsTypeStart+_miFieldCountSecondHalf) - if len(fields) != fsTypeStart+_miFieldCountSecondHalf { - return nil, mountPointFormatInvalidError{line} - } - - miFieldIDFSType := _miFieldOffsetFSType + fsTypeStart - miFieldIDMountSource := _miFieldOffsetMountSource + fsTypeStart - miFieldIDSuperOptions := _miFieldOffsetSuperOptions + fsTypeStart - - return &MountPoint{ - MountID: mountID, - ParentID: parentID, - DeviceID: fields[_miFieldIDDeviceID], - Root: fields[_miFieldIDRoot], - MountPoint: fields[_miFieldIDMountPoint], - Options: strings.Split(fields[_miFieldIDOptions], _mountInfoOptsSep), - OptionalFields: fields[_miFieldIDOptionalFields:(fsTypeStart - 1)], - FSType: fields[miFieldIDFSType], - MountSource: fields[miFieldIDMountSource], - SuperOptions: strings.Split(fields[miFieldIDSuperOptions], _mountInfoOptsSep), - }, nil - } - } - - return nil, mountPointFormatInvalidError{line} -} - -// Translate converts an absolute path inside the *MountPoint's file system to -// the host file system path in the mount namespace the *MountPoint belongs to. -func (mp *MountPoint) Translate(absPath string) (string, error) { - relPath, err := filepath.Rel(mp.Root, absPath) - - if err != nil { - return "", err - } - if relPath == ".." || strings.HasPrefix(relPath, "../") { - return "", pathNotExposedFromMountPointError{ - mountPoint: mp.MountPoint, - root: mp.Root, - path: absPath, - } - } - - return filepath.Join(mp.MountPoint, relPath), nil -} - -// parseMountInfo parses procPathMountInfo (usually at `/proc/$PID/mountinfo`) -// and yields parsed *MountPoint into newMountPoint. -func parseMountInfo(procPathMountInfo string, newMountPoint func(*MountPoint) error) error { - mountInfoFile, err := os.Open(procPathMountInfo) - if err != nil { - return err - } - defer mountInfoFile.Close() - - scanner := bufio.NewScanner(mountInfoFile) - - for scanner.Scan() { - mountPoint, err := NewMountPointFromLine(scanner.Text()) - if err != nil { - return err - } - if err := newMountPoint(mountPoint); err != nil { - return err - } - } - - return scanner.Err() -} |