tests/integration: Add tests for idmap mounts with userns

Signed-off-by: Francis Laniel <[email protected]>

tests/integration/idmap.bats

@@ -0,0 +1,149 @@
+#!/usr/bin/env bats
+
+load helpers
+
+function setup() {
+	requires root
+	requires_kernel 5.12
+	requires_idmap_fs /tmp
+
+	setup_debian
+
+	# Prepare source folders for bind mount
+	mkdir -p source-{1,2}/
+	touch source-{1,2}/foo.txt
+
+	# Use other owner for source-2
+	chown 1:1 source-2/foo.txt
+
+	mkdir -p rootfs/{proc,sys,tmp}
+	mkdir -p rootfs/tmp/mount-{1,2}
+	mkdir -p rootfs/mnt/bind-mount-{1,2}
+
+	update_config ' .process.args += ["-c", "stat -c =%u=%g= /tmp/mount-1/foo.txt"]
+		| .mounts += [
+					{
+						"source": "source-1/",
+						"destination": "/tmp/mount-1",
+						"options": ["bind"],
+						"uidMappings": [ {
+						                  "containerID": 0,
+						                  "hostID": 100000,
+						                  "size": 65536
+						                }
+						],
+						"gidMappings": [        {
+						                  "containerID": 0,
+						                  "hostID": 100000,
+						                  "size": 65536
+						                }
+						]
+					}
+				] '
+}
+
+function teardown() {
+	teardown_bundle
+}
+
+@test "simple idmap mount" {
+	runc run test_debian
+	[ "$status" -eq 0 ]
+	[[ "$output" == *"=100000=100000="* ]]
+}
+
+@test "write to an idmap mount" {
+	# We need to change the config to permit UID 0 to write the mount id map.
+	update_config ' .process.args = ["sh", "-c", "touch /tmp/mount-1/bar && stat -c =%u=%g= /tmp/mount-1/bar"]
+		| .mounts |= map((select(.source == "source-1/") | .uidMappings[0].hostID = 0 | .gidMappings[0].hostID = 0) // .)'
+	runc run test_debian
+	[ "$status" -eq 0 ]
+	[[ "$output" == *"=0=0="* ]]
+}
+
+@test "idmap mount with propagation flag" {
+	update_config ' .process.args = ["sh", "-c", "findmnt -o PROPAGATION /tmp/mount-1"]'
+	# Add the shared option to the idmap mount
+	update_config ' .mounts |= map((select(.source == "source-1/") | .options += ["shared"]) // .)'
+
+	runc run test_debian
+	[ "$status" -eq 0 ]
+	[[ "$output" == *"shared"* ]]
+}
+
+@test "idmap mount with bind mount" {
+	update_config '   .mounts += [
+					{
+						"source": "source-2/",
+						"destination": "/tmp/mount-2",
+						"options": ["bind"]
+					}
+				] '
+
+	runc run test_debian
+	[ "$status" -eq 0 ]
+	[[ "$output" == *"=100000=100000="* ]]
+}
+
+@test "two idmap mounts with two bind mounts" {
+	update_config '   .process.args = ["sh", "-c", "stat -c =%u=%g= /tmp/mount-1/foo.txt /tmp/mount-2/foo.txt"]
+			| .mounts += [
+					{
+						"source": "source-1/",
+						"destination": "/mnt/bind-mount-1",
+						"options": ["bind"]
+					},
+					{
+						"source": "source-2/",
+						"destination": "/mnt/bind-mount-2",
+						"options": ["bind"]
+					},
+					{
+						"source": "source-2/",
+						"destination": "/tmp/mount-2",
+						"options": ["bind"],
+						"uidMappings": [ {
+						                  "containerID": 0,
+						                  "hostID": 100000,
+						                  "size": 65536
+						                }
+						],
+						"gidMappings": [        {
+						                  "containerID": 0,
+						                  "hostID": 100000,
+						                  "size": 65536
+						                }
+						]
+					}
+				] '
+
+	runc run test_debian
+	[ "$status" -eq 0 ]
+	[[ "$output" == *"=100000=100000="* ]]
+	# source-2/ is owned by 1:1, so we expect this with the idmap mount too.
+	[[ "$output" == *"=100001=100001="* ]]
+}
+
+@test "idmap mount without gidMappings fails" {
+	update_config ' .mounts |= map((select(.source == "source-1/") | del(.gidMappings) ) // .)'
+
+	runc run test_debian
+	[ "$status" -eq 1 ]
+	[[ "${output}" == *"invalid mount"* ]]
+}
+
+@test "idmap mount without uidMappings fails" {
+	update_config ' .mounts |= map((select(.source == "source-1/") | del(.uidMappings) ) // .)'
+
+	runc run test_debian
+	[ "$status" -eq 1 ]
+	[[ "${output}" == *"invalid mount"* ]]
+}
+
+@test "idmap mount without bind fails" {
+	update_config ' .mounts |= map((select(.source == "source-1/") | .options = [""]) // .)'
+
+	runc run test_debian
+	[ "$status" -eq 1 ]
+	[[ "${output}" == *"invalid mount"* ]]
+}