Bump github.com/containers/common from 0.23.0 to 0.24.0

Bumps [github.com/containers/common](https://github.com/containers/common) from 0.23.0 to 0.24.0.
- [Release notes](https://github.com/containers/common/releases)
- [Commits](https://github.com/containers/common/compare/v0.23.0...v0.24.0)

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

go.mod

@@ -3,7 +3,7 @@ module github.com/containers/skopeo
 go 1.12
 
 require (
-	github.com/containers/common v0.23.0
+	github.com/containers/common v0.24.0
 	github.com/containers/image/v5 v5.6.0
 	github.com/containers/ocicrypt v1.0.3
 	github.com/containers/storage v1.23.5

go.sum

@@ -39,8 +39,8 @@ github.com/containerd/fifo v0.0.0-20190226154929-a9fb20d87448/go.mod h1:ODA38xgv
 github.com/containerd/go-runc v0.0.0-20180907222934-5a6d9f37cfa3/go.mod h1:IV7qH3hrUgRmyYrtgEeGWJfWbgcHL9CSRruz2Vqcph0=
 github.com/containerd/ttrpc v0.0.0-20190828154514-0e0f228740de/go.mod h1:PvCDdDGpgqzQIzDW1TphrGLssLDZp2GuS+X5DkEJB8o=
 github.com/containerd/typeurl v0.0.0-20180627222232-a93fcdb778cd/go.mod h1:Cm3kwCdlkCfMSHURc+r6fwoGH6/F1hH3S4sg0rLFWPc=
-github.com/containers/common v0.23.0 h1:+g4mI3wUYSzOtoWU9TNVoV4K52/aN6JEz0qs1YdPEe8=
-github.com/containers/common v0.23.0/go.mod h1:E56/N0beWGf+lrrJX32atuo2hkjzHwSC8n1vCG+TAR0=
+github.com/containers/common v0.24.0 h1:5C03ROzmRvZCyooNJVkZ4Q8T2d04g+VVyPMQ428XC4Y=
+github.com/containers/common v0.24.0/go.mod h1:BFRo6uRh1TbkZgR2oYTILxc2BNZTBtBffa9xtu881QI=
 github.com/containers/image/v5 v5.6.0 h1:r4AqIX4NO/X7OJkqX574zITV3fq0ZPn0pSlLsxWF6ww=
 github.com/containers/image/v5 v5.6.0/go.mod h1:iUSWo3SOLqJo0CkZkKrHxqR6YWqrT98mkXFpE0MceE8=
 github.com/containers/libtrust v0.0.0-20190913040956-14b96171aa3b h1:Q8ePgVfHDplZ7U33NwHZkrVELsZP5fYj9pM5WBZB2GE=

vendor/github.com/containers/common/pkg/capabilities/capabilities.go

@@ -0,0 +1,156 @@
+package capabilities
+
+// Copyright 2013-2018 Docker, Inc.
+
+// NOTE: this package has been copied from github.com/docker/docker but been
+//       changed significantly to fit the needs of libpod.
+
+import (
+	"strings"
+
+	"github.com/pkg/errors"
+	"github.com/syndtr/gocapability/capability"
+)
+
+var (
+	// Used internally and populated during init().
+	capabilityList []string
+
+	// ErrUnknownCapability is thrown when an unknown capability is processed.
+	ErrUnknownCapability = errors.New("unknown capability")
+
+	// ContainerImageLabels - label can indicate the required
+	// capabilities required by containers to run the container image.
+	ContainerImageLabels = []string{"io.containers.capabilities"}
+)
+
+// All is a special value used to add/drop all known capababilities.
+// Useful on the CLI for `--cap-add=all` etc.
+const All = "ALL"
+
+func init() {
+	last := capability.CAP_LAST_CAP
+	// hack for RHEL6 which has no /proc/sys/kernel/cap_last_cap
+	if last == capability.Cap(63) {
+		last = capability.CAP_BLOCK_SUSPEND
+	}
+	for _, cap := range capability.List() {
+		if cap > last {
+			continue
+		}
+		capabilityList = append(capabilityList, "CAP_"+strings.ToUpper(cap.String()))
+	}
+}
+
+// stringInSlice determines if a string is in a string slice, returns bool
+func stringInSlice(s string, sl []string) bool {
+	for _, i := range sl {
+		if i == s {
+			return true
+		}
+	}
+	return false
+}
+
+// AllCapabilities returns all known capabilities.
+func AllCapabilities() []string {
+	return capabilityList
+}
+
+// NormalizeCapabilities normalizes caps by adding a "CAP_" prefix (if not yet
+// present).
+func NormalizeCapabilities(caps []string) ([]string, error) {
+	normalized := make([]string, len(caps))
+	for i, c := range caps {
+		c = strings.ToUpper(c)
+		if c == All {
+			normalized = append(normalized, c)
+			continue
+		}
+		if !strings.HasPrefix(c, "CAP_") {
+			c = "CAP_" + c
+		}
+		if !stringInSlice(c, capabilityList) {
+			return nil, errors.Wrapf(ErrUnknownCapability, "%q", c)
+		}
+		normalized[i] = c
+	}
+	return normalized, nil
+}
+
+// ValidateCapabilities validates if caps only contains valid capabilities.
+func ValidateCapabilities(caps []string) error {
+	for _, c := range caps {
+		if !stringInSlice(c, capabilityList) {
+			return errors.Wrapf(ErrUnknownCapability, "%q", c)
+		}
+	}
+	return nil
+}
+
+// MergeCapabilities computes a set of capabilities by adding capapbitilities
+// to or dropping them from base.
+//
+// Note that:
+// "ALL" in capAdd adds returns known capabilities
+// "All" in capDrop returns only the capabilities specified in capAdd
+func MergeCapabilities(base, adds, drops []string) ([]string, error) {
+	var caps []string
+
+	// Normalize the base capabilities
+	base, err := NormalizeCapabilities(base)
+	if err != nil {
+		return nil, err
+	}
+	if len(adds) == 0 && len(drops) == 0 {
+		// Nothing to tweak; we're done
+		return base, nil
+	}
+	capDrop, err := NormalizeCapabilities(drops)
+	if err != nil {
+		return nil, err
+	}
+	capAdd, err := NormalizeCapabilities(adds)
+	if err != nil {
+		return nil, err
+	}
+
+	if stringInSlice(All, capDrop) {
+		// "Drop" all capabilities; return what's in capAdd instead
+		return capAdd, nil
+	}
+
+	if stringInSlice(All, capAdd) {
+		// "Add" all capabilities;
+		return capabilityList, nil
+	}
+
+	for _, add := range capAdd {
+		if stringInSlice(add, capDrop) {
+			return nil, errors.Errorf("capability %q cannot be dropped and added", add)
+		}
+	}
+
+	for _, drop := range capDrop {
+		if stringInSlice(drop, capAdd) {
+			return nil, errors.Errorf("capability %q cannot be dropped and added", drop)
+		}
+	}
+
+	// Drop any capabilities in capDrop that are in base
+	for _, cap := range base {
+		if stringInSlice(cap, capDrop) {
+			continue
+		}
+		caps = append(caps, cap)
+	}
+
+	// Add any capabilities in capAdd that are not in base
+	for _, cap := range capAdd {
+		if stringInSlice(cap, base) {
+			continue
+		}
+		caps = append(caps, cap)
+	}
+	return caps, nil
+}

vendor/github.com/containers/common/pkg/completion/completion.go

@@ -1,6 +1,14 @@
 package completion
 
-import "github.com/spf13/cobra"
+import (
+	"bufio"
+	"os"
+	"strings"
+	"unicode"
+
+	"github.com/containers/common/pkg/capabilities"
+	"github.com/spf13/cobra"
+)
 
 // FlagCompletions - hold flag completion functions to be applied later with CompleteCommandFlags()
 type FlagCompletions map[string]func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective)
@@ -24,3 +32,62 @@ func AutocompleteNone(cmd *cobra.Command, args []string, toComplete string) ([]s
 func AutocompleteDefault(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
 	return nil, cobra.ShellCompDirectiveDefault
 }
+
+// AutocompleteCapabilities - Autocomplete linux capabilities options.
+// Used by --cap-add and --cap-drop.
+func AutocompleteCapabilities(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+	caps := capabilities.AllCapabilities()
+
+	// convertCase will convert a string to lowercase only if the user input is lowercase
+	convertCase := func(s string) string { return s }
+	if len(toComplete) > 0 && unicode.IsLower(rune(toComplete[0])) {
+		convertCase = strings.ToLower
+	}
+
+	// offset is used to trim "CAP_" if the user doesn't type CA... or ca...
+	offset := 0
+	if !strings.HasPrefix(toComplete, convertCase("CA")) {
+		// setting the offset to 4 is safe since each cap starts with CAP_
+		offset = 4
+	}
+
+	var completions []string
+	for _, cap := range caps {
+		completions = append(completions, convertCase(cap)[offset:])
+	}
+
+	// add ALL here which is also a valid argument
+	completions = append(completions, convertCase(capabilities.All))
+	return completions, cobra.ShellCompDirectiveNoFileComp
+}
+
+// autocompleteSubIDName - autocomplete the names in /etc/subuid or /etc/subgid
+func autocompleteSubIDName(filename string) ([]string, cobra.ShellCompDirective) {
+	file, err := os.Open(filename)
+	if err != nil {
+		return nil, cobra.ShellCompDirectiveError
+	}
+	defer file.Close()
+
+	var names []string
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		name := strings.SplitN(scanner.Text(), ":", 2)[0]
+		names = append(names, name)
+	}
+	if err = scanner.Err(); err != nil {
+		return nil, cobra.ShellCompDirectiveError
+	}
+
+	return names, cobra.ShellCompDirectiveNoFileComp
+}
+
+// AutocompleteSubgidName - Autocomplete subgidname based on the names in the /etc/subgid file.
+func AutocompleteSubgidName(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+	return autocompleteSubIDName("/etc/subgid")
+}
+
+// AutocompleteSubuidName - Autocomplete subuidname based on the names in the /etc/subuid file.
+func AutocompleteSubuidName(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+	return autocompleteSubIDName("/etc/subuid")
+}

vendor/modules.txt

@@ -35,8 +35,9 @@ github.com/beorn7/perks/quantile
 github.com/containerd/cgroups/stats/v1
 # github.com/containerd/containerd v1.3.2
 github.com/containerd/containerd/errdefs
-# github.com/containers/common v0.23.0
+# github.com/containers/common v0.24.0
 github.com/containers/common/pkg/auth
+github.com/containers/common/pkg/capabilities
 github.com/containers/common/pkg/completion
 github.com/containers/common/pkg/retry
 # github.com/containers/image/v5 v5.6.0