Bump github.com/containers/storage from 1.23.2 to 1.23.4

Bumps [github.com/containers/storage](https://github.com/containers/storage) from 1.23.2 to 1.23.4.
- [Release notes](https://github.com/containers/storage/releases)
- [Changelog](https://github.com/containers/storage/blob/master/docs/containers-storage-changes.md)
- [Commits](https://github.com/containers/storage/compare/v1.23.2...v1.23.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

vendor/github.com/moby/sys/mountinfo/LICENSE

@@ -0,0 +1,202 @@
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vendor/github.com/moby/sys/mountinfo/go.mod

@@ -0,0 +1,3 @@
+module github.com/moby/sys/mountinfo
+
+go 1.14

vendor/github.com/moby/sys/mountinfo/mountinfo.go

@@ -0,0 +1,67 @@
+package mountinfo
+
+import "io"
+
+// GetMounts retrieves a list of mounts for the current running process,
+// with an optional filter applied (use nil for no filter).
+func GetMounts(f FilterFunc) ([]*Info, error) {
+	return parseMountTable(f)
+}
+
+// GetMountsFromReader retrieves a list of mounts from the
+// reader provided, with an optional filter applied (use nil
+// for no filter). This can be useful in tests or benchmarks
+// that provide a fake mountinfo data.
+func GetMountsFromReader(reader io.Reader, f FilterFunc) ([]*Info, error) {
+	return parseInfoFile(reader, f)
+}
+
+// Mounted determines if a specified mountpoint has been mounted.
+// On Linux it looks at /proc/self/mountinfo.
+func Mounted(mountpoint string) (bool, error) {
+	entries, err := GetMounts(SingleEntryFilter(mountpoint))
+	if err != nil {
+		return false, err
+	}
+
+	return len(entries) > 0, nil
+}
+
+// Info reveals information about a particular mounted filesystem. This
+// struct is populated from the content in the /proc/<pid>/mountinfo file.
+type Info struct {
+	// ID is a unique identifier of the mount (may be reused after umount).
+	ID int
+
+	// Parent indicates the ID of the mount parent (or of self for the top of the
+	// mount tree).
+	Parent int
+
+	// Major indicates one half of the device ID which identifies the device class.
+	Major int
+
+	// Minor indicates one half of the device ID which identifies a specific
+	// instance of device.
+	Minor int
+
+	// Root of the mount within the filesystem.
+	Root string
+
+	// Mountpoint indicates the mount point relative to the process's root.
+	Mountpoint string
+
+	// Opts represents mount-specific options.
+	Opts string
+
+	// Optional represents optional fields.
+	Optional string
+
+	// Fstype indicates the type of filesystem, such as EXT3.
+	Fstype string
+
+	// Source indicates filesystem specific information or "none".
+	Source string
+
+	// VfsOpts represents per super block options.
+	VfsOpts string
+}

vendor/github.com/moby/sys/mountinfo/mountinfo_filters.go

@@ -0,0 +1,58 @@
+package mountinfo
+
+import "strings"
+
+// FilterFunc is a type defining a callback function for GetMount(),
+// used to filter out mountinfo entries we're not interested in,
+// and/or stop further processing if we found what we wanted.
+//
+// It takes a pointer to the Info struct (not fully populated,
+// currently only Mountpoint, Fstype, Source, and (on Linux)
+// VfsOpts are filled in), and returns two booleans:
+//
+//  - skip: true if the entry should be skipped
+//  - stop: true if parsing should be stopped after the entry
+type FilterFunc func(*Info) (skip, stop bool)
+
+// PrefixFilter discards all entries whose mount points
+// do not start with a specific prefix
+func PrefixFilter(prefix string) FilterFunc {
+	return func(m *Info) (bool, bool) {
+		skip := !strings.HasPrefix(m.Mountpoint, prefix)
+		return skip, false
+	}
+}
+
+// SingleEntryFilter looks for a specific entry
+func SingleEntryFilter(mp string) FilterFunc {
+	return func(m *Info) (bool, bool) {
+		if m.Mountpoint == mp {
+			return false, true // don't skip, stop now
+		}
+		return true, false // skip, keep going
+	}
+}
+
+// ParentsFilter returns all entries whose mount points
+// can be parents of a path specified, discarding others.
+//
+// For example, given `/var/lib/docker/something`, entries
+// like `/var/lib/docker`, `/var` and `/` are returned.
+func ParentsFilter(path string) FilterFunc {
+	return func(m *Info) (bool, bool) {
+		skip := !strings.HasPrefix(path, m.Mountpoint)
+		return skip, false
+	}
+}
+
+// FstypeFilter returns all entries that match provided fstype(s).
+func FstypeFilter(fstype ...string) FilterFunc {
+	return func(m *Info) (bool, bool) {
+		for _, t := range fstype {
+			if m.Fstype == t {
+				return false, false // don't skeep, keep going
+			}
+		}
+		return true, false // skip, keep going
+	}
+}

vendor/github.com/moby/sys/mountinfo/mountinfo_freebsd.go

@@ -0,0 +1,53 @@
+package mountinfo
+
+/*
+#include <sys/param.h>
+#include <sys/ucred.h>
+#include <sys/mount.h>
+*/
+import "C"
+
+import (
+	"fmt"
+	"reflect"
+	"unsafe"
+)
+
+// parseMountTable returns information about mounted filesystems
+func parseMountTable(filter FilterFunc) ([]*Info, error) {
+	var rawEntries *C.struct_statfs
+
+	count := int(C.getmntinfo(&rawEntries, C.MNT_WAIT))
+	if count == 0 {
+		return nil, fmt.Errorf("Failed to call getmntinfo")
+	}
+
+	var entries []C.struct_statfs
+	header := (*reflect.SliceHeader)(unsafe.Pointer(&entries))
+	header.Cap = count
+	header.Len = count
+	header.Data = uintptr(unsafe.Pointer(rawEntries))
+
+	var out []*Info
+	for _, entry := range entries {
+		var mountinfo Info
+		var skip, stop bool
+		mountinfo.Mountpoint = C.GoString(&entry.f_mntonname[0])
+		mountinfo.Fstype = C.GoString(&entry.f_fstypename[0])
+		mountinfo.Source = C.GoString(&entry.f_mntfromname[0])
+
+		if filter != nil {
+			// filter out entries we're not interested in
+			skip, stop = filter(&mountinfo)
+			if skip {
+				continue
+			}
+		}
+
+		out = append(out, &mountinfo)
+		if stop {
+			break
+		}
+	}
+	return out, nil
+}

vendor/github.com/moby/sys/mountinfo/mountinfo_linux.go

@@ -0,0 +1,152 @@
+// +build go1.13
+
+package mountinfo
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func parseInfoFile(r io.Reader, filter FilterFunc) ([]*Info, error) {
+	s := bufio.NewScanner(r)
+	out := []*Info{}
+	var err error
+	for s.Scan() {
+		if err = s.Err(); err != nil {
+			return nil, err
+		}
+		/*
+		   See http://man7.org/linux/man-pages/man5/proc.5.html
+
+		   36 35 98:0 /mnt1 /mnt2 rw,noatime master:1 - ext3 /dev/root rw,errors=continue
+		   (1)(2)(3)   (4)   (5)      (6)      (7)   (8) (9)   (10)         (11)
+
+		   (1) mount ID:  unique identifier of the mount (may be reused after umount)
+		   (2) parent ID:  ID of parent (or of self for the top of the mount tree)
+		   (3) major:minor:  value of st_dev for files on filesystem
+		   (4) root:  root of the mount within the filesystem
+		   (5) mount point:  mount point relative to the process's root
+		   (6) mount options:  per mount options
+		   (7) optional fields:  zero or more fields of the form "tag[:value]"
+		   (8) separator:  marks the end of the optional fields
+		   (9) filesystem type:  name of filesystem of the form "type[.subtype]"
+		   (10) mount source:  filesystem specific information or "none"
+		   (11) super options:  per super block options
+
+		   In other words, we have:
+		    * 6 mandatory fields	(1)..(6)
+		    * 0 or more optional fields	(7)
+		    * a separator field		(8)
+		    * 3 mandatory fields	(9)..(11)
+		*/
+
+		text := s.Text()
+		fields := strings.Split(text, " ")
+		numFields := len(fields)
+		if numFields < 10 {
+			// should be at least 10 fields
+			return nil, fmt.Errorf("Parsing '%s' failed: not enough fields (%d)", text, numFields)
+		}
+
+		// separator field
+		sepIdx := numFields - 4
+		// In Linux <= 3.9 mounting a cifs with spaces in a share
+		// name (like "//srv/My Docs") _may_ end up having a space
+		// in the last field of mountinfo (like "unc=//serv/My Docs").
+		// Since kernel 3.10-rc1, cifs option "unc=" is ignored,
+		// so spaces should not appear.
+		//
+		// Check for a separator, and work around the spaces bug
+		for fields[sepIdx] != "-" {
+			sepIdx--
+			if sepIdx == 5 {
+				return nil, fmt.Errorf("Parsing '%s' failed: missing - separator", text)
+			}
+		}
+
+		p := &Info{}
+
+		// Fill in the fields that a filter might check
+		p.Mountpoint, err = strconv.Unquote(`"` + fields[4] + `"`)
+		if err != nil {
+			return nil, fmt.Errorf("Parsing '%s' failed: unable to unquote mount point field: %w", fields[4], err)
+		}
+		p.Fstype = fields[sepIdx+1]
+		p.Source = fields[sepIdx+2]
+		p.VfsOpts = fields[sepIdx+3]
+
+		// Run a filter soon so we can skip parsing/adding entries
+		// the caller is not interested in
+		var skip, stop bool
+		if filter != nil {
+			skip, stop = filter(p)
+			if skip {
+				continue
+			}
+		}
+
+		// Fill in the rest of the fields
+
+		// ignore any numbers parsing errors, as there should not be any
+		p.ID, _ = strconv.Atoi(fields[0])
+		p.Parent, _ = strconv.Atoi(fields[1])
+		mm := strings.Split(fields[2], ":")
+		if len(mm) != 2 {
+			return nil, fmt.Errorf("Parsing '%s' failed: unexpected minor:major pair %s", text, mm)
+		}
+		p.Major, _ = strconv.Atoi(mm[0])
+		p.Minor, _ = strconv.Atoi(mm[1])
+
+		p.Root, err = strconv.Unquote(`"` + fields[3] + `"`)
+		if err != nil {
+			return nil, fmt.Errorf("Parsing '%s' failed: unable to unquote root field: %w", fields[3], err)
+		}
+
+		p.Opts = fields[5]
+
+		// zero or more optional fields
+		switch {
+		case sepIdx == 6:
+			// zero, do nothing
+		case sepIdx == 7:
+			p.Optional = fields[6]
+		default:
+			p.Optional = strings.Join(fields[6:sepIdx-1], " ")
+		}
+
+		out = append(out, p)
+		if stop {
+			break
+		}
+	}
+	return out, nil
+}
+
+// Parse /proc/self/mountinfo because comparing Dev and ino does not work from
+// bind mounts
+func parseMountTable(filter FilterFunc) ([]*Info, error) {
+	f, err := os.Open("/proc/self/mountinfo")
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+
+	return parseInfoFile(f, filter)
+}
+
+// PidMountInfo collects the mounts for a specific process ID. If the process
+// ID is unknown, it is better to use `GetMounts` which will inspect
+// "/proc/self/mountinfo" instead.
+func PidMountInfo(pid int) ([]*Info, error) {
+	f, err := os.Open(fmt.Sprintf("/proc/%d/mountinfo", pid))
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+
+	return parseInfoFile(f, nil)
+}

vendor/github.com/moby/sys/mountinfo/mountinfo_unsupported.go

@@ -0,0 +1,17 @@
+// +build !windows,!linux,!freebsd freebsd,!cgo
+
+package mountinfo
+
+import (
+	"fmt"
+	"io"
+	"runtime"
+)
+
+func parseMountTable(_ FilterFunc) ([]*Info, error) {
+	return nil, fmt.Errorf("mount.parseMountTable is not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
+}
+
+func parseInfoFile(_ io.Reader, f FilterFunc) ([]*Info, error) {
+	return parseMountTable(f)
+}

vendor/github.com/moby/sys/mountinfo/mountinfo_windows.go

@@ -0,0 +1,12 @@
+package mountinfo
+
+import "io"
+
+func parseMountTable(_ FilterFunc) ([]*Info, error) {
+	// Do NOT return an error!
+	return nil, nil
+}
+
+func parseInfoFile(_ io.Reader, f FilterFunc) ([]*Info, error) {
+	return parseMountTable(f)
+}