debug-generator: Add unit and drop-in credentials

These allow adding extra units and drop-ins via credentials.

test/TEST-54-CREDS/test.sh

@@ -9,6 +9,19 @@ NSPAWN_CREDS=(
 )
 NSPAWN_ARGUMENTS="${NSPAWN_ARGUMENTS:-} ${NSPAWN_CREDS[*]}"
 
+UNIT_CRED=$(base64 -w 0 <<EOF
+[Service]
+Type=oneshot
+ExecStart=touch /tmp/unit-cred
+EOF
+)
+DROPIN_CRED=$(base64 -w 0 <<EOF
+[Service]
+ExecStart=
+ExecStart=touch /tmp/unit-dropin
+EOF
+)
+
 QEMU_CREDS=(
     "-fw_cfg name=opt/io.systemd.credentials/myqemucredential,string=othervalue"
     "-smbios type=11,value=io.systemd.credential:smbioscredential=magicdata"
@@ -17,6 +30,8 @@ QEMU_CREDS=(
     "-smbios type=11,value=io.systemd.credential.binary:tmpfiles.extra=ZiAvdG1wL3NvdXJjZWRmcm9tY3JlZGVudGlhbCAtIC0gLSAtIHRtcGZpbGVzc2VjcmV0Cg=="
     "-smbios type=11,value=io.systemd.credential.binary:fstab.extra=aW5qZWN0ZWQgL2luamVjdGVkIHRtcGZzIFgtbW91bnQubWtkaXIgMCAwCg=="
     "-smbios type=11,value=io.systemd.credential:getty.ttys.container=idontexist"
+    "-smbios type=11,value=io.systemd.credential.binary:systemd.extra-unit.my-service.service=$UNIT_CRED"
+    "-smbios type=11,value=io.systemd.credential.binary:systemd.unit-dropin.my-service.service=$DROPIN_CRED"
 )
 QEMU_OPTIONS="${QEMU_OPTIONS:-} ${QEMU_CREDS[*]}"
 

test/units/testsuite-54.sh

@@ -200,6 +200,10 @@ elif [ -d /sys/firmware/qemu_fw_cfg/by_name ]; then
     [ "$(cat /tmp/sourcedfromcredential)" = "tmpfilessecret" ]
     [ "$(cat /etc/motd.d/50-provision.conf)" = "hello" ]
     [ "$(cat /etc/issue.d/50-provision.conf)" = "welcome" ]
+
+    # Verify that adding a unit and drop-in via credentials worked
+    systemctl start my-service
+    test -f /tmp/unit-dropin
 else
     echo "qemu_fw_cfg support missing in kernel. Sniff!"
     expected_credential=""