tests: add test for shifting support

Signed-off-by: Giuseppe Scrivano <[email protected]>

drivers/overlay/overlay.go

@@ -990,6 +990,9 @@ func (d *Driver) UpdateLayerIDMap(id string, toContainer, toHost *idtools.IDMapp
 
 // SupportsShifting tells whether the driver support shifting of the UIDs/GIDs in an userNS
 func (d *Driver) SupportsShifting() bool {
+	if os.Getenv("_TEST_FORCE_SUPPORT_SHIFTING") == "yes-please" {
+		return true
+	}
 	return d.options.mountProgram != ""
 }
 

tests/helpers.bash

@@ -2,7 +2,7 @@
 
 STORAGE_BINARY=${STORAGE_BINARY:-$(dirname ${BASH_SOURCE})/../containers-storage}
 TESTSDIR=${TESTSDIR:-$(dirname ${BASH_SOURCE})}
-STORAGE_DRIVER=${STORAGE_DRIVER:-vfs}
+STORAGE_DRIVER=${STORAGE_DRIVER:-overlay}
 STORAGE_OPTION=${STORAGE_OPTION:-}
 PATH=$(dirname ${BASH_SOURCE})/..:${PATH}
 

tests/idmaps.bats

@@ -753,3 +753,45 @@ load helpers
 	echo ntops:$ntops
 	[ $ntops -eq 1 ]
 }
+
+@test "idmaps-create-mapped-container-shifting" {
+	case "$STORAGE_DRIVER" in
+	overlay*)
+		;;
+		*)
+	skip "not supported by driver $STORAGE_DRIVER"
+		;;
+	esac
+
+	run storage --debug=false create-layer
+	[ "$status" -eq 0 ]
+	[ "$output" != "" ]
+	layer="$output"
+	# Mount the layer.
+	run storage --debug=false mount $layer
+	[ "$status" -eq 0 ]
+	[ "$output" != "" ]
+	lowermount="$output"
+	# Put a file in the layer.
+	createrandom "$lowermount"/file
+	storage unmount $layer
+
+        imagename=idmappedimage-shifting
+	storage create-image --name=$imagename $layer
+
+	_TEST_FORCE_SUPPORT_SHIFTING=yes-please run storage --debug=false create-container --uidmap 0:1000:1000 --gidmap 0:1000:1000 $imagename
+	echo "$output"
+	[ "$status" -eq 0 ]
+	[ "$output" != "" ]
+
+	container="$output"
+
+	# Mount the container.
+        run storage --debug=false mount $container
+	echo "$output"
+	[ "$status" -eq 0 ]
+        dir="$output"
+        test -e "$(stat -c%u:%g $dir/file)" == "0:0"
+	run storage --debug=false unmount "$container"
+	[ "$status" -eq 0 ]
+}