libpod: Move volume_internal_linux.go to volume_internal_common.go

[NO NEW TESTS NEEDED]

Signed-off-by: Doug Rabson <dfr@rabson.org>

1 files changed, 0 insertions, 194 deletions

diff --git a/libpod/volume_internal_linux.go b/libpod/volume_internal_linux.go
deleted file mode 100644
index 440bceec3..000000000
--- a/libpod/volume_internal_linux.go
+++ /dev/null
@@ -1,194 +0,0 @@
-//go:build linux
-// +build linux
-
-package libpod
-
-import (
-	"errors"
-	"fmt"
-	"os/exec"
-	"strings"
-
-	"github.com/containers/podman/v4/libpod/define"
-	pluginapi "github.com/docker/go-plugins-helpers/volume"
-	"github.com/sirupsen/logrus"
-	"golang.org/x/sys/unix"
-)
-
-// This is a pseudo-container ID to use when requesting a mount or unmount from
-// the volume plugins.
-// This is the shas256 of the string "placeholder\n".
-const pseudoCtrID = "2f73349cfc4630255319c6c8dfc1b46a8996ace9d14d8e07563b165915918ec2"
-
-// mount mounts the volume if necessary.
-// A mount is necessary if a volume has any options set.
-// If a mount is necessary, v.state.MountCount will be incremented.
-// If it was 0 when the increment occurred, the volume will be mounted on the
-// host. Otherwise, we assume it is already mounted.
-// Must be done while the volume is locked.
-// Is a no-op on volumes that do not require a mount (as defined by
-// volumeNeedsMount()).
-func (v *Volume) mount() error {
-	if !v.needsMount() {
-		return nil
-	}
-
-	// Update the volume from the DB to get an accurate mount counter.
-	if err := v.update(); err != nil {
-		return err
-	}
-
-	// If the count is non-zero, the volume is already mounted.
-	// Nothing to do.
-	if v.state.MountCount > 0 {
-		v.state.MountCount++
-		logrus.Debugf("Volume %s mount count now at %d", v.Name(), v.state.MountCount)
-		return v.save()
-	}
-
-	// Volume plugins implement their own mount counter, based on the ID of
-	// the mounting container. But we already have one, and honestly I trust
-	// ours more. So hardcode container ID to something reasonable, and use
-	// the same one for everything.
-	if v.UsesVolumeDriver() {
-		if v.plugin == nil {
-			return fmt.Errorf("volume plugin %s (needed by volume %s) missing: %w", v.Driver(), v.Name(), define.ErrMissingPlugin)
-		}
-
-		req := new(pluginapi.MountRequest)
-		req.Name = v.Name()
-		req.ID = pseudoCtrID
-		mountPoint, err := v.plugin.MountVolume(req)
-		if err != nil {
-			return err
-		}
-
-		v.state.MountCount++
-		v.state.MountPoint = mountPoint
-		return v.save()
-	} else if v.config.Driver == define.VolumeDriverImage {
-		mountPoint, err := v.runtime.storageService.MountContainerImage(v.config.StorageID)
-		if err != nil {
-			return fmt.Errorf("mounting volume %s image failed: %w", v.Name(), err)
-		}
-
-		v.state.MountCount++
-		v.state.MountPoint = mountPoint
-		return v.save()
-	}
-
-	volDevice := v.config.Options["device"]
-	volType := v.config.Options["type"]
-	volOptions := v.config.Options["o"]
-
-	// Some filesystems (tmpfs) don't have a device, but we still need to
-	// give the kernel something.
-	if volDevice == "" && volType != "" {
-		volDevice = volType
-	}
-
-	// We need to use the actual mount command.
-	// Convincing unix.Mount to use the same semantics as the mount command
-	// itself seems prohibitively difficult.
-	// TODO: might want to cache this path in the runtime?
-	mountPath, err := exec.LookPath("mount")
-	if err != nil {
-		return fmt.Errorf("locating 'mount' binary: %w", err)
-	}
-	mountArgs := []string{}
-	if volOptions != "" {
-		mountArgs = append(mountArgs, "-o", volOptions)
-	}
-	switch volType {
-	case "":
-	case "bind":
-		mountArgs = append(mountArgs, "-o", volType)
-	default:
-		mountArgs = append(mountArgs, "-t", volType)
-	}
-
-	mountArgs = append(mountArgs, volDevice, v.config.MountPoint)
-	mountCmd := exec.Command(mountPath, mountArgs...)
-
-	logrus.Debugf("Running mount command: %s %s", mountPath, strings.Join(mountArgs, " "))
-	if output, err := mountCmd.CombinedOutput(); err != nil {
-		logrus.Debugf("Mount %v failed with %v", mountCmd, err)
-		return errors.New(string(output))
-	}
-
-	logrus.Debugf("Mounted volume %s", v.Name())
-
-	// Increment the mount counter
-	v.state.MountCount++
-	logrus.Debugf("Volume %s mount count now at %d", v.Name(), v.state.MountCount)
-	return v.save()
-}
-
-// unmount unmounts the volume if necessary.
-// Unmounting a volume that is not mounted is a no-op.
-// Unmounting a volume that does not require a mount is a no-op.
-// The volume must be locked for this to occur.
-// The mount counter will be decremented if non-zero. If the counter reaches 0,
-// the volume will really be unmounted, as no further containers are using the
-// volume.
-// If force is set, the volume will be unmounted regardless of mount counter.
-func (v *Volume) unmount(force bool) error {
-	if !v.needsMount() {
-		return nil
-	}
-
-	// Update the volume from the DB to get an accurate mount counter.
-	if err := v.update(); err != nil {
-		return err
-	}
-
-	if v.state.MountCount == 0 {
-		logrus.Debugf("Volume %s already unmounted", v.Name())
-		return nil
-	}
-
-	if !force {
-		v.state.MountCount--
-	} else {
-		v.state.MountCount = 0
-	}
-
-	logrus.Debugf("Volume %s mount count now at %d", v.Name(), v.state.MountCount)
-
-	if v.state.MountCount == 0 {
-		if v.UsesVolumeDriver() {
-			if v.plugin == nil {
-				return fmt.Errorf("volume plugin %s (needed by volume %s) missing: %w", v.Driver(), v.Name(), define.ErrMissingPlugin)
-			}
-
-			req := new(pluginapi.UnmountRequest)
-			req.Name = v.Name()
-			req.ID = pseudoCtrID
-			if err := v.plugin.UnmountVolume(req); err != nil {
-				return err
-			}
-
-			v.state.MountPoint = ""
-			return v.save()
-		} else if v.config.Driver == define.VolumeDriverImage {
-			if _, err := v.runtime.storageService.UnmountContainerImage(v.config.StorageID, force); err != nil {
-				return fmt.Errorf("unmounting volume %s image: %w", v.Name(), err)
-			}
-
-			v.state.MountPoint = ""
-			return v.save()
-		}
-
-		// Unmount the volume
-		if err := unix.Unmount(v.config.MountPoint, unix.MNT_DETACH); err != nil {
-			if err == unix.EINVAL {
-				// Ignore EINVAL - the mount no longer exists.
-				return nil
-			}
-			return fmt.Errorf("unmounting volume %s: %w", v.Name(), err)
-		}
-		logrus.Debugf("Unmounted volume %s", v.Name())
-	}
-
-	return v.save()
-}