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Add capability for snapshotters to declare support for UID remapping

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This allows user namespace support to progress, either by allowing
snapshotters to deal with ownership, or falling back to containerd doing
a recursive chown.

In the future, when snapshotters implement idmap mounts, they should
report the "remap-ids" capability.

Co-authored-by: Rodrigo Campos <rodrigoca@microsoft.com>
Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>
Signed-off-by: David Leadbeater <dgl@dgl.cx>
This commit is contained in:
David Leadbeater
2022-08-19 05:22:44 +00:00
committed by Rodrigo Campos
parent 36f520dc04
commit 31a6449734
14 changed files with 270 additions and 12 deletions
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5
snapshots/snapshotter.go
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@@ -33,6 +33,11 @@ const (
UnpackKeyFormat = UnpackKeyPrefix + "-%s %s"
inheritedLabelsPrefix = "containerd.io/snapshot/"
labelSnapshotRef = "containerd.io/snapshot.ref"
// LabelSnapshotUIDMapping is the label used for UID mappings
LabelSnapshotUIDMapping = "containerd.io/snapshot/uidmapping"
// LabelSnapshotGIDMapping is the label used for GID mappings
LabelSnapshotGIDMapping = "containerd.io/snapshot/gidmapping"
)
// Kind identifies the kind of snapshot.