test-50-dissect: move minimal image setup to common setup function

So that it can be re-used for other tests by simply setting
TEST_INSTALL_VERITY_MINIMAL=1 in test.sh, without having to
replicate the setup commands.

test/TEST-50-DISSECT/test.sh

@@ -5,11 +5,10 @@ set -e
 TEST_DESCRIPTION="test systemd-dissect"
 IMAGE_NAME="dissect"
 TEST_NO_NSPAWN=1
+TEST_INSTALL_VERITY_MINIMAL=1
 
 . $TEST_BASE_DIR/test-functions
 
-command -v mksquashfs >/dev/null 2>&1 || exit 0
-command -v veritysetup >/dev/null 2>&1 || exit 0
 command -v sfdisk >/dev/null 2>&1 || exit 0
 
 # Need loop devices for systemd-dissect
@@ -21,23 +20,7 @@ test_append_files() {
         install_dmevent
         generate_module_dependencies
         inst_binary losetup
-
-        BASICTOOLS=(
-            bash
-            cat
-            mount
-        )
-        oldinitdir=$initdir
-        export initdir=$TESTDIR/minimal
-        mkdir -p $initdir/usr/lib $initdir/etc
-        setup_basic_dirs
-        install_basic_tools
-        cp $os_release $initdir/usr/lib/os-release
-        ln -s ../usr/lib/os-release $initdir/etc/os-release
-        echo MARKER=1 >> $initdir/usr/lib/os-release
-        mksquashfs $initdir $oldinitdir/usr/share/minimal.raw
-        veritysetup format $oldinitdir/usr/share/minimal.raw $oldinitdir/usr/share/minimal.verity | grep '^Root hash:' | cut -f2 | tr -d '\n' > $oldinitdir/usr/share/minimal.roothash
-        export initdir=$oldinitdir
+        install_verity_minimal
     )
 }
 

test/test-functions

@@ -462,6 +462,53 @@ run_nspawn() {
     return 0
 }
 
+# Build two very minimal root images, with two units, one is the same and one is different across them
+install_verity_minimal() {
+    if [ -e $initdir/usr/share/minimal.raw ]; then
+        return
+    fi
+    if ! command -v mksquashfs >/dev/null 2>&1; then
+        dfatal "mksquashfs not found"
+        exit 1
+    fi
+    if ! command -v veritysetup >/dev/null 2>&1; then
+        dfatal "veritysetup not found"
+        exit 1
+    fi
+    (
+        BASICTOOLS=(
+            bash
+            cat
+            mount
+            sleep
+        )
+        oldinitdir=$initdir
+        rm -rfv $TESTDIR/minimal
+        export initdir=$TESTDIR/minimal
+        mkdir -p $initdir/usr/lib/systemd/system $initdir/etc
+        setup_basic_dirs
+        install_basic_tools
+        cp $os_release $initdir/usr/lib/os-release
+        ln -s ../usr/lib/os-release $initdir/etc/os-release
+        touch $initdir/etc/machine-id $initdir/etc/resolv.conf
+        echo MARKER=1 >> $initdir/usr/lib/os-release
+        echo -e "[Service]\nExecStartPre=cat /usr/lib/os-release\nExecStart=sleep 120" > $initdir/usr/lib/systemd/system/app0.service
+        cp $initdir/usr/lib/systemd/system/app0.service $initdir/usr/lib/systemd/system/app0-foo.service
+
+        mksquashfs $initdir $oldinitdir/usr/share/minimal_0.raw
+        veritysetup format $oldinitdir/usr/share/minimal_0.raw $oldinitdir/usr/share/minimal_0.verity | \
+            grep '^Root hash:' | cut -f2 | tr -d '\n' > $oldinitdir/usr/share/minimal_0.roothash
+
+        sed -i "s/MARKER=1/MARKER=2/g" $initdir/usr/lib/os-release
+        rm $initdir/usr/lib/systemd/system/app0-foo.service
+        cp $initdir/usr/lib/systemd/system/app0.service $initdir/usr/lib/systemd/system/app0-bar.service
+
+        mksquashfs $initdir $oldinitdir/usr/share/minimal_1.raw
+        veritysetup format $oldinitdir/usr/share/minimal_1.raw $oldinitdir/usr/share/minimal_1.verity | \
+            grep '^Root hash:' | cut -f2 | tr -d '\n' > $oldinitdir/usr/share/minimal_1.roothash
+    )
+}
+
 setup_basic_environment() {
     # create the basic filesystem layout
     setup_basic_dirs
@@ -492,6 +539,9 @@ setup_basic_environment() {
     if [[ "$IS_BUILT_WITH_ASAN" = "yes" ]]; then
         create_asan_wrapper
     fi
+    if [ -n "$TEST_INSTALL_VERITY_MINIMAL" ]; then
+        install_verity_minimal
+    fi
 }
 
 setup_selinux() {

test/units/testsuite-50.sh

@@ -24,8 +24,8 @@ fi
 
 trap cleanup EXIT
 
-cp /usr/share/minimal.* "${image_dir}/"
-image="${image_dir}/minimal"
+cp /usr/share/minimal* "${image_dir}/"
+image="${image_dir}/minimal_0"
 roothash="$(cat ${image}.roothash)"
 
 os_release=$(test -e /etc/os-release && echo /etc/os-release || echo /usr/lib/os-release)