refine dangling filter

By proxy by vendoring containers/common.  Previously, a "dangling" image
was an untagged image; just a described in the Docker docs.  The
definition of dangling has now been refined to an untagged image without
children to be compatible with Docker.

Signed-off-by: Valentin Rothberg <[email protected]>

go.mod

@@ -41,3 +41,5 @@ require (
 )
 
 replace github.com/sirupsen/logrus => github.com/sirupsen/logrus v1.4.2
+
+replace github.com/containers/common => github.com/vrothberg/common v0.0.3-0.20210720072730-d0521b9dc993

go.sum

@@ -224,8 +224,6 @@ github.com/containernetworking/cni v0.8.1 h1:7zpDnQ3T3s4ucOuJ/ZCLrYBxzkg0AELFfII
 github.com/containernetworking/cni v0.8.1/go.mod h1:LGwApLUm2FpoOfxTDEeq8T9ipbpZ61X79hmU3w8FmsY=
 github.com/containernetworking/plugins v0.8.6/go.mod h1:qnw5mN19D8fIwkqW7oHHYDHVlzhJpcY6TQxn/fUyDDM=
 github.com/containernetworking/plugins v0.9.1/go.mod h1:xP/idU2ldlzN6m4p5LmGiwRDjeJr6FLK6vuiUwoH7P8=
-github.com/containers/common v0.40.2-0.20210707094508-0a4a1906d4b2 h1:2ApmOS9jSnJXuSOkZNEAZ7j0/9i8zjoi67b/UpUjPxY=
-github.com/containers/common v0.40.2-0.20210707094508-0a4a1906d4b2/go.mod h1:thow5Jn7O+rP01njI9COQ16L9g/KQ1LcMcYqP2NhYCU=
 github.com/containers/image/v5 v5.13.2 h1:AgYunV/9d2fRkrmo23wH2MkqeHolFd6oQCkK+1PpuFA=
 github.com/containers/image/v5 v5.13.2/go.mod h1:GkWursKDlDcUIT7L7vZf70tADvZCk/Ga0wgS0MuF0ag=
 github.com/containers/libtrust v0.0.0-20190913040956-14b96171aa3b h1:Q8ePgVfHDplZ7U33NwHZkrVELsZP5fYj9pM5WBZB2GE=
@@ -236,7 +234,6 @@ github.com/containers/ocicrypt v1.1.1/go.mod h1:Dm55fwWm1YZAjYRaJ94z2mfZikIyIN4B
 github.com/containers/ocicrypt v1.1.2 h1:Ez+GAMP/4GLix5Ywo/fL7O0nY771gsBIigiqUm1aXz0=
 github.com/containers/ocicrypt v1.1.2/go.mod h1:Dm55fwWm1YZAjYRaJ94z2mfZikIyIN4B0oB3dj3jFxY=
 github.com/containers/storage v1.32.2/go.mod h1:YIBxxjfXZTi04Ah49sh1uSGfmT1V89+I5i3deRobzQo=
-github.com/containers/storage v1.32.5/go.mod h1:8/DVVDqniaUlUV0D0q7cEnXK6Bs2uU3FPqNZVPumwEs=
 github.com/containers/storage v1.32.6 h1:NqdFRewXO/PYPjgCAScoigZc5QUA21yapSEj6kqD8cw=
 github.com/containers/storage v1.32.6/go.mod h1:mdB+b89p+jU8zpzLTVXA0gWMmIo0WrkfGMh1R8O2IQw=
 github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
@@ -611,7 +608,6 @@ github.com/onsi/ginkgo v1.10.1/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+
 github.com/onsi/ginkgo v1.10.3/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
 github.com/onsi/ginkgo v1.11.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
 github.com/onsi/ginkgo v1.12.1/go.mod h1:zj2OWP4+oCPe1qIXoGWkgMRwljMUYCdkwsT2108oapk=
-github.com/onsi/ginkgo v1.16.2/go.mod h1:CObGmKUOKaSC0RjmoAK7tKyn4Azo5P2IWuoMnvwxz1E=
 github.com/onsi/ginkgo v1.16.4 h1:29JGrr5oVBm5ulCWet69zQkzWipVXIol6ygQUe/EzNc=
 github.com/onsi/ginkgo v1.16.4/go.mod h1:dX+/inL/fNMqNlz0e9LfyB9TswhZpCVdJM/Z6Vvnwo0=
 github.com/onsi/gomega v0.0.0-20151007035656-2152b45fa28a/go.mod h1:C1qb7wdrVGGVU+Z6iS04AVkA3Q65CEZX59MT0QO5uiA=
@@ -620,7 +616,6 @@ github.com/onsi/gomega v1.7.0/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1Cpa
 github.com/onsi/gomega v1.7.1/go.mod h1:XdKZgCCFLUoM/7CFJVPcG8C1xQ1AJ0vpAezJrB7JYyY=
 github.com/onsi/gomega v1.10.1/go.mod h1:iN09h71vgCQne3DLsj+A5owkum+a2tYe+TOCB1ybHNo=
 github.com/onsi/gomega v1.10.3/go.mod h1:V9xEwhxec5O8UDM77eCW8vLymOMltsqPVYWrpDsH8xc=
-github.com/onsi/gomega v1.13.0/go.mod h1:lRk9szgn8TxENtWd0Tp4c3wjlRfMTMH27I+3Je41yGY=
 github.com/onsi/gomega v1.14.0 h1:ep6kpPVwmr/nTbklSx2nrLNSIO62DoYAhnPNIMhK8gI=
 github.com/onsi/gomega v1.14.0/go.mod h1:cIuvLEne0aoVhAgh/O6ac0Op8WWw9H6eYCriF+tEHG0=
 github.com/opencontainers/go-digest v0.0.0-20170106003457-a6d0ee40d420/go.mod h1:cMLVZDEM3+U2I4VmLI6N8jQYUd2OVphdqWwCJHrFt2s=
@@ -791,6 +786,8 @@ github.com/vishvananda/netns v0.0.0-20180720170159-13995c7128cc/go.mod h1:ZjcWmF
 github.com/vishvananda/netns v0.0.0-20191106174202-0a2b9b5464df/go.mod h1:JP3t17pCcGlemwknint6hfoeCVQrEMVwxRLRjXpq+BU=
 github.com/vishvananda/netns v0.0.0-20200728191858-db3c7e526aae h1:4hwBBUfQCFe3Cym0ZtKyq7L16eZUtYKs+BaHDN6mAns=
 github.com/vishvananda/netns v0.0.0-20200728191858-db3c7e526aae/go.mod h1:DD4vA1DwXk04H54A1oHXtwZmA0grkVMdPxx/VGLCah0=
+github.com/vrothberg/common v0.0.3-0.20210720072730-d0521b9dc993 h1:O93Pe2k1nQE8u1tcwg4NGK0Dm5V2lYHBJUl++zAb7Do=
+github.com/vrothberg/common v0.0.3-0.20210720072730-d0521b9dc993/go.mod h1:w0CLPB8nH75msgISbE/z8TMIxK9disFsmvFNd2SDid8=
 github.com/willf/bitset v1.1.11-0.20200630133818-d5bec3311243/go.mod h1:RjeCKbqT1RxIR/KWY6phxZiaY1IyutSBfGjNPySAYV4=
 github.com/willf/bitset v1.1.11/go.mod h1:83CECat5yLh5zVOf4P1ErAgKA5UDvKtgyUABdr3+MjI=
 github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f/go.mod h1:N2zxlSyiKSe5eX1tZViRH5QA0qijqEDrYZiPEAiq3wU=

tests/rmi.bats

@@ -155,6 +155,21 @@ load helpers
   expect_output ""
 }
 
+@test "attempt to prune non-dangling empty images" {
+  # Regression test for containers/podman/issues/10832
+  ctxdir=${TESTDIR}/bud
+  mkdir -p $ctxdir
+  cat >$ctxdir/Dockerfile <<EOF
+FROM scratch
+ENV test1=test1
+ENV test2=test2
+EOF
+
+  run_buildah bud -t test $ctxdir
+  run_buildah rmi --prune
+  expect_output "" "no image gets pruned"
+}
+
 @test "use conflicting commands to remove images" {
   _prefetch alpine
   run_buildah from --quiet --pull=false --signature-policy ${TESTSDIR}/policy.json alpine