Enable --device directory as src device

Enables --device accepte directory path as source device. Add the devices under the source directory to the destination directory.

complete card test criteria: https://jira.coreos.com/browse/RUN-497
related podman issue: containers/podman#2380

Signed-off-by: Qi Wang <qiwan@redhat.com>

cmd/buildah/bud.go

@@ -273,7 +273,7 @@ func budCmd(c *cobra.Command, inputArgs []string, iopts budResults) error {
 		if err != nil {
 			return err
 		}
-		devices = append(devices, dev)
+		devices = append(devices, dev...)
 	}
 
 	options := imagebuildah.BuildOptions{

cmd/buildah/from.go

@@ -218,7 +218,7 @@ func fromCmd(c *cobra.Command, args []string, iopts fromReply) error {
 		if err != nil {
 			return err
 		}
-		devices = append(devices, dev)
+		devices = append(devices, dev...)
 	}
 
 	options := buildah.BuilderOptions{

docs/buildah-bud.md

@@ -176,7 +176,7 @@ value can be entered.  The password is entered without echo.
 
 **--device**=*device*
 
-Add a host device to the container. The format is `<device-on-host>[:<device-on-container>][:<permissions>]` (e.g. --device=/dev/sdc:/dev/xvdc:rwm)
+Add a host device or devices under a directory to the container. The format is `<device-on-host>[:<device-on-container>][:<permissions>]` (e.g. --device=/dev/sdc:/dev/xvdc:rwm)
 
 **--disable-compression, -D**
 Don't compress filesystem layers when building the image unless it is required

docs/buildah-from.md

@@ -173,7 +173,7 @@ value can be entered.  The password is entered without echo.
 
 **--device**=*device*
 
-Add a host device to the container. The format is `<device-on-host>[:<device-on-container>][:<permissions>]` (e.g. --device=/dev/sdc:/dev/xvdc:rwm)
+Add a host device or devices under a directory to the container. The format is `<device-on-host>[:<device-on-container>][:<permissions>]` (e.g. --device=/dev/sdc:/dev/xvdc:rwm)
 
 **--dns**=[]
 

pkg/parse/parse_test.go

@@ -74,17 +74,22 @@ func TestDeviceFromPath(t *testing.T) {
 	// Path is valid
 	dev, err := DeviceFromPath("/dev/null")
 	assert.NoError(t, err)
-	assert.Equal(t, dev.Major, int64(1))
-	assert.Equal(t, dev.Minor, int64(3))
-	assert.Equal(t, dev.Permissions, "rwm")
-	assert.Equal(t, dev.Uid, uint32(0))
-	assert.Equal(t, dev.Gid, uint32(0))
+	assert.Equal(t, len(dev), 1)
+	assert.Equal(t, dev[0].Major, int64(1))
+	assert.Equal(t, dev[0].Minor, int64(3))
+	assert.Equal(t, dev[0].Permissions, "rwm")
+	assert.Equal(t, dev[0].Uid, uint32(0))
+	assert.Equal(t, dev[0].Gid, uint32(0))
 
 	// Path does not exists
 	_, err = DeviceFromPath("/dev/BOGUS")
 	assert.Error(t, err)
 
-	// Path exists but is not a device
+	// Path is a directory of devices
 	_, err = DeviceFromPath("/dev/pts")
+	assert.NoError(t, err)
+
+	// path of directory has no device
+	_, err = DeviceFromPath("/etc/passwd")
 	assert.Error(t, err)
 }

pkg/parse/parse_unix.go

@@ -4,6 +4,8 @@ package parse
 
 import (
 	"fmt"
+	"os"
+	"path/filepath"
 
 	"github.com/containers/buildah/pkg/unshare"
 	"github.com/opencontainers/runc/libcontainer/configs"
@@ -24,18 +26,40 @@ func getDefaultProcessLimits() []string {
 	return defaultLimits
 }
 
-func DeviceFromPath(device string) (configs.Device, error) {
+func DeviceFromPath(device string) ([]configs.Device, error) {
+	var devs []configs.Device
 	src, dst, permissions, err := Device(device)
 	if err != nil {
-		return configs.Device{}, err
+		return nil, err
 	}
 	if unshare.IsRootless() {
-		return configs.Device{}, errors.Errorf("Renaming device %s to %s is not a supported in rootless containers", src, dst)
+		return nil, errors.Errorf("Renaming device %s to %s is not a supported in rootless containers", src, dst)
 	}
-	dev, err := devices.DeviceFromPath(src, permissions)
+	srcInfo, err := os.Stat(src)
 	if err != nil {
-		return configs.Device{}, errors.Wrapf(err, "%s is not a valid device", src)
+		return nil, errors.Wrapf(err, "error getting info of source device %s", src)
 	}
-	dev.Path = dst
-	return *dev, nil
+
+	if !srcInfo.IsDir() {
+
+		dev, err := devices.DeviceFromPath(src, permissions)
+		if err != nil {
+			return nil, errors.Wrapf(err, "%s is not a valid device", src)
+		}
+		dev.Path = dst
+		devs = append(devs, *dev)
+		return devs, nil
+	}
+
+	// If source device is a directory
+	srcDevices, err := devices.GetDevices(src)
+	if err != nil {
+		return nil, errors.Wrapf(err, "error getting source devices from directory %s", src)
+	}
+	for _, d := range srcDevices {
+		d.Path = filepath.Join(dst, filepath.Base(d.Path))
+		d.Permissions = permissions
+		devs = append(devs, *d)
+	}
+	return devs, nil
 }

tests/bud.bats

@@ -1690,6 +1690,18 @@ load helpers
   run_buildah bud --signature-policy ${TESTSDIR}/policy.json --squash ${TESTSDIR}/bud/layers-squash
 }
 
+@test "bud with additional directory of devices" {
+  target=alpine-image
+  mkdir ${TESTSDIR}/foo
+  mknod ${TESTSDIR}/foo/null c 1 3
+  run_buildah bud --signature-policy ${TESTSDIR}/policy.json --device ${TESTSDIR}/foo:/dev/fuse --device /dev/fuse -t ${target} -f ${TESTSDIR}/bud/device/Dockerfile ${TESTSDIR}/bud/device
+  [ "${status}" -eq 0 ]
+  expect_output --substring "null"
+
+  buildah rmi ${target}
+  rm -rf ${TESTSDIR}/foo
+}
+
 @test "bud with additional device" {
   target=alpine-image
   run_buildah bud --signature-policy ${TESTSDIR}/policy.json --device /dev/fuse -t ${target} -f ${TESTSDIR}/bud/device/Dockerfile ${TESTSDIR}/bud/device
@@ -1793,7 +1805,7 @@ load helpers
   echo "$output"
   expect_output --substring "abc.txt"
 
-  rm ${TESTSDIR}/bud/use-args/abc.txt 
+  rm ${TESTSDIR}/bud/use-args/abc.txt
   buildah rm --all
   buildah rmi --all --force
 }