bea751beb7
Implement Children method for containerd image store which makes the `ancestor` filter work for `docker ps`. Checking if image is a children of other image is implemented by comparing their rootfs diffids because containerd image store doesn't have a concept of image parentship like the graphdriver store. The child is expected to have more layers than the parent and should start with all parent layers. Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
55 lines
1.4 KiB
Go
55 lines
1.4 KiB
Go
package containerd
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import (
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"testing"
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"github.com/opencontainers/go-digest"
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ocispec "github.com/opencontainers/image-spec/specs-go/v1"
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"gotest.tools/v3/assert"
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is "gotest.tools/v3/assert/cmp"
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)
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func TestIsRootfsChildOf(t *testing.T) {
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// Each unique letter is one distinct DiffID
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ab := toRootfs("AB")
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abc := toRootfs("ABC")
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abd := toRootfs("ABD")
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xyz := toRootfs("XYZ")
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xyzab := toRootfs("XYZAB")
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for _, tc := range []struct {
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name string
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parent ocispec.RootFS
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child ocispec.RootFS
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out bool
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}{
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{parent: ab, child: abc, out: true, name: "one additional layer"},
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{parent: xyz, child: xyzab, out: true, name: "two additional layers"},
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{parent: xyz, child: xyz, out: false, name: "parent is not a child of itself"},
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{parent: abc, child: abd, out: false, name: "sibling"},
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{parent: abc, child: xyz, out: false, name: "completely different rootfs, but same length"},
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{parent: abc, child: ab, out: false, name: "child can't be shorter than parent"},
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{parent: ab, child: xyzab, out: false, name: "parent layers appended"},
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} {
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tc := tc
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t.Run(tc.name, func(t *testing.T) {
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out := isRootfsChildOf(tc.child, tc.parent)
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assert.Check(t, is.Equal(out, tc.out))
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})
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}
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}
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func toRootfs(values string) ocispec.RootFS {
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dgsts := []digest.Digest{}
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for _, v := range values {
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vd := digest.FromString(string(v))
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dgsts = append(dgsts, vd)
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}
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return ocispec.RootFS{
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Type: "layers",
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DiffIDs: dgsts,
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}
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}
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