[PATCH v9 11/14] iotests: add script_initialize

[John Snow <jsnow@redhat.com>]

Like script_main, but doesn't require a single point of entry.
Replace all existing initialization sections with this drop-in replacement.

This brings debug support to all existing script-style iotests.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
 tests/qemu-iotests/149        |  3 +-
 tests/qemu-iotests/194        |  4 +-
 tests/qemu-iotests/202        |  4 +-
 tests/qemu-iotests/203        |  4 +-
 tests/qemu-iotests/206        |  2 +-
 tests/qemu-iotests/207        |  6 ++-
 tests/qemu-iotests/208        |  2 +-
 tests/qemu-iotests/209        |  2 +-
 tests/qemu-iotests/210        |  6 ++-
 tests/qemu-iotests/211        |  6 ++-
 tests/qemu-iotests/212        |  6 ++-
 tests/qemu-iotests/213        |  6 ++-
 tests/qemu-iotests/216        |  4 +-
 tests/qemu-iotests/218        |  2 +-
 tests/qemu-iotests/219        |  2 +-
 tests/qemu-iotests/222        |  7 ++--
 tests/qemu-iotests/224        |  4 +-
 tests/qemu-iotests/228        |  6 ++-
 tests/qemu-iotests/234        |  4 +-
 tests/qemu-iotests/235        |  4 +-
 tests/qemu-iotests/236        |  2 +-
 tests/qemu-iotests/237        |  2 +-
 tests/qemu-iotests/238        |  2 +
 tests/qemu-iotests/242        |  2 +-
 tests/qemu-iotests/246        |  2 +-
 tests/qemu-iotests/248        |  2 +-
 tests/qemu-iotests/254        |  2 +-
 tests/qemu-iotests/255        |  2 +-
 tests/qemu-iotests/256        |  2 +-
 tests/qemu-iotests/258        |  7 ++--
 tests/qemu-iotests/260        |  4 +-
 tests/qemu-iotests/262        |  4 +-
 tests/qemu-iotests/264        |  4 +-
 tests/qemu-iotests/277        |  2 +
 tests/qemu-iotests/280        |  8 ++--
 tests/qemu-iotests/283        |  4 +-
 tests/qemu-iotests/iotests.py | 75 +++++++++++++++++++++++------------
 37 files changed, 129 insertions(+), 81 deletions(-)

diff --git a/tests/qemu-iotests/149 b/tests/qemu-iotests/149
index b4a21bf7b7..852768f80a 100755
--- a/tests/qemu-iotests/149
+++ b/tests/qemu-iotests/149
@@ -382,8 +382,7 @@ def test_once(config, qemu_img=False):
 
 
 # Obviously we only work with the luks image format
-iotests.verify_image_format(supported_fmts=['luks'])
-iotests.verify_platform()
+iotests.script_initialize(supported_fmts=['luks'])
 
 # We need sudo in order to run cryptsetup to create
 # dm-crypt devices. This is safe to use on any
diff --git a/tests/qemu-iotests/194 b/tests/qemu-iotests/194
index 9dc1bd3510..8b1f720af4 100755
--- a/tests/qemu-iotests/194
+++ b/tests/qemu-iotests/194
@@ -21,8 +21,8 @@
 
 import iotests
 
-iotests.verify_image_format(supported_fmts=['qcow2', 'qed', 'raw'])
-iotests.verify_platform(['linux'])
+iotests.script_initialize(supported_fmts=['qcow2', 'qed', 'raw'],
+                          supported_platforms=['linux'])
 
 with iotests.FilePath('source.img') as source_img_path, \
      iotests.FilePath('dest.img') as dest_img_path, \
diff --git a/tests/qemu-iotests/202 b/tests/qemu-iotests/202
index 920a8683ef..e3900a44d1 100755
--- a/tests/qemu-iotests/202
+++ b/tests/qemu-iotests/202
@@ -24,8 +24,8 @@
 
 import iotests
 
-iotests.verify_image_format(supported_fmts=['qcow2'])
-iotests.verify_platform(['linux'])
+iotests.script_initialize(supported_fmts=['qcow2'],
+                          supported_platforms=['linux'])
 
 with iotests.FilePath('disk0.img') as disk0_img_path, \
      iotests.FilePath('disk1.img') as disk1_img_path, \
diff --git a/tests/qemu-iotests/203 b/tests/qemu-iotests/203
index 49eff5d405..4b4bd3307d 100755
--- a/tests/qemu-iotests/203
+++ b/tests/qemu-iotests/203
@@ -24,8 +24,8 @@
 
 import iotests
 
-iotests.verify_image_format(supported_fmts=['qcow2'])
-iotests.verify_platform(['linux'])
+iotests.script_initialize(supported_fmts=['qcow2'],
+                          supported_platforms=['linux'])
 
 with iotests.FilePath('disk0.img') as disk0_img_path, \
      iotests.FilePath('disk1.img') as disk1_img_path, \
diff --git a/tests/qemu-iotests/206 b/tests/qemu-iotests/206
index e2b50ae24d..f42432a838 100755
--- a/tests/qemu-iotests/206
+++ b/tests/qemu-iotests/206
@@ -23,7 +23,7 @@
 import iotests
 from iotests import imgfmt
 
-iotests.verify_image_format(supported_fmts=['qcow2'])
+iotests.script_initialize(supported_fmts=['qcow2'])
 
 with iotests.FilePath('t.qcow2') as disk_path, \
      iotests.FilePath('t.qcow2.base') as backing_path, \
diff --git a/tests/qemu-iotests/207 b/tests/qemu-iotests/207
index 3d9c1208ca..a6621410da 100755
--- a/tests/qemu-iotests/207
+++ b/tests/qemu-iotests/207
@@ -24,8 +24,10 @@ import iotests
 import subprocess
 import re
 
-iotests.verify_image_format(supported_fmts=['raw'])
-iotests.verify_protocol(supported=['ssh'])
+iotests.script_initialize(
+    supported_fmts=['raw'],
+    supported_protocols=['ssh'],
+)
 
 def filter_hash(qmsg):
     def _filter(key, value):
diff --git a/tests/qemu-iotests/208 b/tests/qemu-iotests/208
index 1c3fc8c7fd..6cb642f821 100755
--- a/tests/qemu-iotests/208
+++ b/tests/qemu-iotests/208
@@ -22,7 +22,7 @@
 
 import iotests
 
-iotests.verify_image_format(supported_fmts=['generic'])
+iotests.script_initialize(supported_fmts=['generic'])
 
 with iotests.FilePath('disk.img') as disk_img_path, \
      iotests.FilePath('disk-snapshot.img') as disk_snapshot_img_path, \
diff --git a/tests/qemu-iotests/209 b/tests/qemu-iotests/209
index 65c1a1e70a..8c804f4a30 100755
--- a/tests/qemu-iotests/209
+++ b/tests/qemu-iotests/209
@@ -22,7 +22,7 @@ import iotests
 from iotests import qemu_img_create, qemu_io, qemu_img_verbose, qemu_nbd, \
                     file_path
 
-iotests.verify_image_format(supported_fmts=['qcow2'])
+iotests.script_initialize(supported_fmts=['qcow2'])
 
 disk = file_path('disk')
 nbd_sock = file_path('nbd-sock', base_dir=iotests.sock_dir)
diff --git a/tests/qemu-iotests/210 b/tests/qemu-iotests/210
index e49896e23d..7bf591f313 100755
--- a/tests/qemu-iotests/210
+++ b/tests/qemu-iotests/210
@@ -23,8 +23,10 @@
 import iotests
 from iotests import imgfmt
 
-iotests.verify_image_format(supported_fmts=['luks'])
-iotests.verify_protocol(supported=['file'])
+iotests.script_initialize(
+    supported_fmts=['luks'],
+    supported_protocols=['file'],
+)
 
 with iotests.FilePath('t.luks') as disk_path, \
      iotests.VM() as vm:
diff --git a/tests/qemu-iotests/211 b/tests/qemu-iotests/211
index 163994d559..4969edb00c 100755
--- a/tests/qemu-iotests/211
+++ b/tests/qemu-iotests/211
@@ -23,8 +23,10 @@
 import iotests
 from iotests import imgfmt
 
-iotests.verify_image_format(supported_fmts=['vdi'])
-iotests.verify_protocol(supported=['file'])
+iotests.script_initialize(
+    supported_fmts=['vdi'],
+    supported_protocols=['file'],
+)
 
 def blockdev_create(vm, options):
     error = vm.blockdev_create(options)
diff --git a/tests/qemu-iotests/212 b/tests/qemu-iotests/212
index 800f92dd84..45d08842bb 100755
--- a/tests/qemu-iotests/212
+++ b/tests/qemu-iotests/212
@@ -23,8 +23,10 @@
 import iotests
 from iotests import imgfmt
 
-iotests.verify_image_format(supported_fmts=['parallels'])
-iotests.verify_protocol(supported=['file'])
+iotests.script_initialize(
+    supported_fmts=['parallels'],
+    supported_protocols=['file'],
+)
 
 with iotests.FilePath('t.parallels') as disk_path, \
      iotests.VM() as vm:
diff --git a/tests/qemu-iotests/213 b/tests/qemu-iotests/213
index 1eee45276a..cf638eb927 100755
--- a/tests/qemu-iotests/213
+++ b/tests/qemu-iotests/213
@@ -23,8 +23,10 @@
 import iotests
 from iotests import imgfmt
 
-iotests.verify_image_format(supported_fmts=['vhdx'])
-iotests.verify_protocol(supported=['file'])
+iotests.script_initialize(
+    supported_fmts=['vhdx'],
+    supported_protocols=['file'],
+)
 
 with iotests.FilePath('t.vhdx') as disk_path, \
      iotests.VM() as vm:
diff --git a/tests/qemu-iotests/216 b/tests/qemu-iotests/216
index 372f042d3e..de11d85b5d 100755
--- a/tests/qemu-iotests/216
+++ b/tests/qemu-iotests/216
@@ -23,8 +23,8 @@ import iotests
 from iotests import log, qemu_img, qemu_io_silent
 
 # Need backing file support
-iotests.verify_image_format(supported_fmts=['qcow2', 'qcow', 'qed', 'vmdk'])
-iotests.verify_platform(['linux'])
+iotests.script_initialize(supported_fmts=['qcow2', 'qcow', 'qed', 'vmdk'],
+                          supported_platforms=['linux'])
 
 log('')
 log('=== Copy-on-read across nodes ===')
diff --git a/tests/qemu-iotests/218 b/tests/qemu-iotests/218
index 1325ba9eaa..5586870456 100755
--- a/tests/qemu-iotests/218
+++ b/tests/qemu-iotests/218
@@ -29,7 +29,7 @@
 import iotests
 from iotests import log, qemu_img, qemu_io_silent
 
-iotests.verify_image_format(supported_fmts=['qcow2', 'raw'])
+iotests.script_initialize(supported_fmts=['qcow2', 'raw'])
 
 
 # Launches the VM, adds two null-co nodes (source and target), and
diff --git a/tests/qemu-iotests/219 b/tests/qemu-iotests/219
index b8774770c4..db272c5249 100755
--- a/tests/qemu-iotests/219
+++ b/tests/qemu-iotests/219
@@ -21,7 +21,7 @@
 
 import iotests
 
-iotests.verify_image_format(supported_fmts=['qcow2'])
+iotests.script_initialize(supported_fmts=['qcow2'])
 
 img_size = 4 * 1024 * 1024
 
diff --git a/tests/qemu-iotests/222 b/tests/qemu-iotests/222
index bf1718e179..6602f6b4ba 100755
--- a/tests/qemu-iotests/222
+++ b/tests/qemu-iotests/222
@@ -24,9 +24,10 @@
 import iotests
 from iotests import log, qemu_img, qemu_io, qemu_io_silent
 
-iotests.verify_platform(['linux'])
-iotests.verify_image_format(supported_fmts=['qcow2', 'qcow', 'qed', 'vmdk',
-                                            'vhdx', 'raw'])
+iotests.script_initialize(
+    supported_fmts=['qcow2', 'qcow', 'qed', 'vmdk', 'vhdx', 'raw'],
+    supported_platforms=['linux'],
+)
 
 patterns = [("0x5d", "0",         "64k"),
             ("0xd5", "1M",        "64k"),
diff --git a/tests/qemu-iotests/224 b/tests/qemu-iotests/224
index e91fb26fd8..81ca1e4898 100755
--- a/tests/qemu-iotests/224
+++ b/tests/qemu-iotests/224
@@ -26,8 +26,8 @@ from iotests import log, qemu_img, qemu_io_silent, filter_qmp_testfiles, \
 import json
 
 # Need backing file support (for arbitrary backing formats)
-iotests.verify_image_format(supported_fmts=['qcow2', 'qcow', 'qed'])
-iotests.verify_platform(['linux'])
+iotests.script_initialize(supported_fmts=['qcow2', 'qcow', 'qed'],
+                          supported_platforms=['linux'])
 
 
 # There are two variations of this test:
diff --git a/tests/qemu-iotests/228 b/tests/qemu-iotests/228
index 64bc82ee23..da0900fb82 100755
--- a/tests/qemu-iotests/228
+++ b/tests/qemu-iotests/228
@@ -25,8 +25,10 @@ from iotests import log, qemu_img, filter_testfiles, filter_imgfmt, \
         filter_qmp_testfiles, filter_qmp_imgfmt
 
 # Need backing file and change-backing-file support
-iotests.verify_image_format(supported_fmts=['qcow2', 'qed'])
-iotests.verify_platform(['linux'])
+iotests.script_initialize(
+    supported_fmts=['qcow2', 'qed'],
+    supported_platforms=['linux'],
+)
 
 
 def log_node_info(node):
diff --git a/tests/qemu-iotests/234 b/tests/qemu-iotests/234
index 324c1549fd..73c899ddae 100755
--- a/tests/qemu-iotests/234
+++ b/tests/qemu-iotests/234
@@ -23,8 +23,8 @@
 import iotests
 import os
 
-iotests.verify_image_format(supported_fmts=['qcow2'])
-iotests.verify_platform(['linux'])
+iotests.script_initialize(supported_fmts=['qcow2'],
+                          supported_platforms=['linux'])
 
 with iotests.FilePath('img') as img_path, \
      iotests.FilePath('backing') as backing_path, \
diff --git a/tests/qemu-iotests/235 b/tests/qemu-iotests/235
index 760826128e..d1b10ac36b 100755
--- a/tests/qemu-iotests/235
+++ b/tests/qemu-iotests/235
@@ -27,6 +27,8 @@ sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'python'))
 
 from qemu.machine import QEMUMachine
 
+iotests.script_initialize(supported_fmts=['qcow2'])
+
 # Note:
 # This test was added to check that mirror dead-lock was fixed (see previous
 # commit before this test addition).
@@ -40,8 +42,6 @@ from qemu.machine import QEMUMachine
 
 size = 1 * 1024 * 1024 * 1024
 
-iotests.verify_image_format(supported_fmts=['qcow2'])
-
 disk = file_path('disk')
 
 # prepare source image
diff --git a/tests/qemu-iotests/236 b/tests/qemu-iotests/236
index 8ce927a16c..6f5cee2444 100755
--- a/tests/qemu-iotests/236
+++ b/tests/qemu-iotests/236
@@ -22,7 +22,7 @@
 import iotests
 from iotests import log
 
-iotests.verify_image_format(supported_fmts=['generic'])
+iotests.script_initialize(supported_fmts=['generic'])
 size = 64 * 1024 * 1024
 granularity = 64 * 1024
 
diff --git a/tests/qemu-iotests/237 b/tests/qemu-iotests/237
index 50ba364a3e..5b21ad3509 100755
--- a/tests/qemu-iotests/237
+++ b/tests/qemu-iotests/237
@@ -24,7 +24,7 @@ import math
 import iotests
 from iotests import imgfmt
 
-iotests.verify_image_format(supported_fmts=['vmdk'])
+iotests.script_initialize(supported_fmts=['vmdk'])
 
 with iotests.FilePath('t.vmdk') as disk_path, \
      iotests.FilePath('t.vmdk.1') as extent1_path, \
diff --git a/tests/qemu-iotests/238 b/tests/qemu-iotests/238
index d4e060228c..b8fcf15a1f 100755
--- a/tests/qemu-iotests/238
+++ b/tests/qemu-iotests/238
@@ -23,6 +23,8 @@ import os
 import iotests
 from iotests import log
 
+iotests.script_initialize()
+
 virtio_scsi_device = iotests.get_virtio_scsi_device()
 
 vm = iotests.VM()
diff --git a/tests/qemu-iotests/242 b/tests/qemu-iotests/242
index 97617876bc..64f1bd95e4 100755
--- a/tests/qemu-iotests/242
+++ b/tests/qemu-iotests/242
@@ -24,7 +24,7 @@ import struct
 from iotests import qemu_img_create, qemu_io, qemu_img_pipe, \
     file_path, img_info_log, log, filter_qemu_io
 
-iotests.verify_image_format(supported_fmts=['qcow2'])
+iotests.script_initialize(supported_fmts=['qcow2'])
 
 disk = file_path('disk')
 chunk = 256 * 1024
diff --git a/tests/qemu-iotests/246 b/tests/qemu-iotests/246
index 59a216a839..58a479cc1f 100755
--- a/tests/qemu-iotests/246
+++ b/tests/qemu-iotests/246
@@ -22,7 +22,7 @@
 import iotests
 from iotests import log
 
-iotests.verify_image_format(supported_fmts=['qcow2'])
+iotests.script_initialize(supported_fmts=['qcow2'])
 size = 64 * 1024 * 1024 * 1024
 gran_small = 32 * 1024
 gran_large = 128 * 1024
diff --git a/tests/qemu-iotests/248 b/tests/qemu-iotests/248
index 68c374692e..18ba03467e 100755
--- a/tests/qemu-iotests/248
+++ b/tests/qemu-iotests/248
@@ -21,7 +21,7 @@
 import iotests
 from iotests import qemu_img_create, qemu_io, file_path, filter_qmp_testfiles
 
-iotests.verify_image_format(supported_fmts=['qcow2'])
+iotests.script_initialize(supported_fmts=['qcow2'])
 
 source, target = file_path('source', 'target')
 size = 5 * 1024 * 1024
diff --git a/tests/qemu-iotests/254 b/tests/qemu-iotests/254
index ee66c986db..150e58be8e 100755
--- a/tests/qemu-iotests/254
+++ b/tests/qemu-iotests/254
@@ -21,7 +21,7 @@
 import iotests
 from iotests import qemu_img_create, file_path, log
 
-iotests.verify_image_format(supported_fmts=['qcow2'])
+iotests.script_initialize(supported_fmts=['qcow2'])
 
 disk, top = file_path('disk', 'top')
 size = 1024 * 1024
diff --git a/tests/qemu-iotests/255 b/tests/qemu-iotests/255
index 4a4818bafb..8f08f741da 100755
--- a/tests/qemu-iotests/255
+++ b/tests/qemu-iotests/255
@@ -23,7 +23,7 @@
 import iotests
 from iotests import imgfmt
 
-iotests.verify_image_format(supported_fmts=['qcow2'])
+iotests.script_initialize(supported_fmts=['qcow2'])
 
 iotests.log('Finishing a commit job with background reads')
 iotests.log('============================================')
diff --git a/tests/qemu-iotests/256 b/tests/qemu-iotests/256
index e34074c83e..db8d6f31cf 100755
--- a/tests/qemu-iotests/256
+++ b/tests/qemu-iotests/256
@@ -23,7 +23,7 @@ import os
 import iotests
 from iotests import log
 
-iotests.verify_image_format(supported_fmts=['qcow2'])
+iotests.script_initialize(supported_fmts=['qcow2'])
 size = 64 * 1024 * 1024
 
 with iotests.FilePath('img0') as img0_path, \
diff --git a/tests/qemu-iotests/258 b/tests/qemu-iotests/258
index 091755a45c..a65151dda6 100755
--- a/tests/qemu-iotests/258
+++ b/tests/qemu-iotests/258
@@ -24,9 +24,10 @@ from iotests import log, qemu_img, qemu_io_silent, \
         filter_qmp_testfiles, filter_qmp_imgfmt
 
 # Need backing file and change-backing-file support
-iotests.verify_image_format(supported_fmts=['qcow2', 'qed'])
-iotests.verify_platform(['linux'])
-
+iotests.script_initialize(
+    supported_fmts=['qcow2', 'qed'],
+    supported_platforms=['linux'],
+)
 
 # Returns a node for blockdev-add
 def node(node_name, path, backing=None, fmt=None, throttle=None):
diff --git a/tests/qemu-iotests/260 b/tests/qemu-iotests/260
index 30c0de380d..804a7addb9 100755
--- a/tests/qemu-iotests/260
+++ b/tests/qemu-iotests/260
@@ -21,7 +21,9 @@
 import iotests
 from iotests import qemu_img_create, file_path, log, filter_qmp_event
 
-iotests.verify_image_format(supported_fmts=['qcow2'])
+iotests.script_initialize(
+    supported_fmts=['qcow2']
+)
 
 base, top = file_path('base', 'top')
 size = 64 * 1024 * 3
diff --git a/tests/qemu-iotests/262 b/tests/qemu-iotests/262
index 8835dce7be..03af061f94 100755
--- a/tests/qemu-iotests/262
+++ b/tests/qemu-iotests/262
@@ -23,8 +23,8 @@
 import iotests
 import os
 
-iotests.verify_image_format(supported_fmts=['qcow2'])
-iotests.verify_platform(['linux'])
+iotests.script_initialize(supported_fmts=['qcow2'],
+                          supported_platforms=['linux'])
 
 with iotests.FilePath('img') as img_path, \
      iotests.FilePath('mig_fifo') as fifo, \
diff --git a/tests/qemu-iotests/264 b/tests/qemu-iotests/264
index 879123a343..304a7443d7 100755
--- a/tests/qemu-iotests/264
+++ b/tests/qemu-iotests/264
@@ -24,7 +24,9 @@ import iotests
 from iotests import qemu_img_create, qemu_io_silent_check, file_path, \
         qemu_nbd_popen, log
 
-iotests.verify_image_format(supported_fmts=['qcow2'])
+iotests.script_initialize(
+    supported_fmts=['qcow2'],
+)
 
 disk_a, disk_b, nbd_sock = file_path('disk_a', 'disk_b', 'nbd-sock')
 nbd_uri = 'nbd+unix:///?socket=' + nbd_sock
diff --git a/tests/qemu-iotests/277 b/tests/qemu-iotests/277
index 04aa15a3d5..d34f87021f 100755
--- a/tests/qemu-iotests/277
+++ b/tests/qemu-iotests/277
@@ -23,6 +23,8 @@ import subprocess
 import iotests
 from iotests import file_path, log
 
+iotests.script_initialize()
+
 
 nbd_sock, conf_file = file_path('nbd-sock', 'nbd-fault-injector.conf')
 
diff --git a/tests/qemu-iotests/280 b/tests/qemu-iotests/280
index 69288fdd0e..f594bb9ed2 100755
--- a/tests/qemu-iotests/280
+++ b/tests/qemu-iotests/280
@@ -22,9 +22,11 @@
 import iotests
 import os
 
-iotests.verify_image_format(supported_fmts=['qcow2'])
-iotests.verify_protocol(supported=['file'])
-iotests.verify_platform(['linux'])
+iotests.script_initialize(
+    supported_fmts=['qcow2'],
+    supported_protocols=['file'],
+    supported_platforms=['linux'],
+)
 
 with iotests.FilePath('base') as base_path , \
      iotests.FilePath('top') as top_path, \
diff --git a/tests/qemu-iotests/283 b/tests/qemu-iotests/283
index 55b7cff953..e17b953333 100644
--- a/tests/qemu-iotests/283
+++ b/tests/qemu-iotests/283
@@ -21,7 +21,9 @@
 import iotests
 
 # The test is unrelated to formats, restrict it to qcow2 to avoid extra runs
-iotests.verify_image_format(supported_fmts=['qcow2'])
+iotests.script_initialize(
+    supported_fmts=['qcow2'],
+)
 
 size = 1024 * 1024
 
diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 4faee06f14..fbca0f2a40 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -28,7 +28,8 @@
 import struct
 import subprocess
 import sys
-from typing import (Any, Callable, Dict, Iterable, List, Optional, TypeVar)
+from typing import (Any, Callable, Collection, Dict,
+                    Iterable, List, Optional, TypeVar)
 import unittest
 
 # pylint: disable=import-error, wrong-import-position
@@ -1023,12 +1024,11 @@ def verify_protocol(supported=(), unsupported=()):
     if not_sup or (imgproto in unsupported):
         notrun('not suitable for this protocol: %s' % imgproto)
 
-def verify_platform(supported=None, unsupported=None):
-    if unsupported is not None:
-        if any((sys.platform.startswith(x) for x in unsupported)):
-            notrun('not suitable for this OS: %s' % sys.platform)
+def verify_platform(supported=(), unsupported=()):
+    if any((sys.platform.startswith(x) for x in unsupported)):
+        notrun('not suitable for this OS: %s' % sys.platform)
 
-    if supported is not None:
+    if supported:
         if not any((sys.platform.startswith(x) for x in supported)):
             notrun('not suitable for this OS: %s' % sys.platform)
 
@@ -1110,7 +1110,18 @@ def func_wrapper(*args, **kwargs):
             return func(*args, **kwargs)
     return func_wrapper
 
-def execute_unittest(output, verbosity, debug):
+def execute_unittest(debug=False):
+    """Executes unittests within the calling module."""
+
+    verbosity = 2 if debug else 1
+
+    if debug:
+        output = sys.stdout
+    else:
+        # We need to filter out the time taken from the output so that
+        # qemu-iotest can reliably diff the results against master output.
+        output = io.StringIO()
+
     runner = unittest.TextTestRunner(stream=output, descriptions=True,
                                      verbosity=verbosity)
     try:
@@ -1118,6 +1129,8 @@ def execute_unittest(output, verbosity, debug):
         # exception
         unittest.main(testRunner=runner)
     finally:
+        # We need to filter out the time taken from the output so that
+        # qemu-iotest can reliably diff the results against master output.
         if not debug:
             out = output.getvalue()
             out = re.sub(r'Ran (\d+) tests? in [\d.]+s', r'Ran \1 tests', out)
@@ -1129,13 +1142,18 @@ def execute_unittest(output, verbosity, debug):
 
             sys.stderr.write(out)
 
-def execute_test(test_function=None,
-                 supported_fmts=(),
-                 supported_platforms=None,
-                 supported_cache_modes=(), supported_aio_modes=(),
-                 unsupported_fmts=(), supported_protocols=(),
-                 unsupported_protocols=()):
-    """Run either unittest or script-style tests."""
+def execute_setup_common(supported_fmts: Collection[str] = (),
+                         supported_platforms: Collection[str] = (),
+                         supported_cache_modes: Collection[str] = (),
+                         supported_aio_modes: Collection[str] = (),
+                         unsupported_fmts: Collection[str] = (),
+                         supported_protocols: Collection[str] = (),
+                         unsupported_protocols: Collection[str] = ()) -> bool:
+    """
+    Perform necessary setup for either script-style or unittest-style tests.
+
+    :return: Bool; Whether or not debug mode has been requested via the CLI.
+    """
 
     # We are using TEST_DIR and QEMU_DEFAULT_MACHINE as proxies to
     # indicate that we're not being run via "check". There may be
@@ -1145,34 +1163,39 @@ def execute_test(test_function=None,
         sys.stderr.write('Please run this test via the "check" script\n')
         sys.exit(os.EX_USAGE)
 
-    debug = '-d' in sys.argv
-    verbosity = 1
     verify_image_format(supported_fmts, unsupported_fmts)
     verify_protocol(supported_protocols, unsupported_protocols)
     verify_platform(supported=supported_platforms)
     verify_cache_mode(supported_cache_modes)
     verify_aio_mode(supported_aio_modes)
 
+    debug = '-d' in sys.argv
     if debug:
-        output = sys.stdout
-        verbosity = 2
         sys.argv.remove('-d')
-    else:
-        # We need to filter out the time taken from the output so that
-        # qemu-iotest can reliably diff the results against master output.
-        output = io.StringIO()
-
     logging.basicConfig(level=(logging.DEBUG if debug else logging.WARN))
 
+    return debug
+
+def execute_test(*args, test_function=None, **kwargs):
+    """Run either unittest or script-style tests."""
+
+    debug = execute_setup_common(*args, **kwargs)
     if not test_function:
-        execute_unittest(output, verbosity, debug)
+        execute_unittest(debug)
     else:
         test_function()
 
+# This is called from script-style iotests without a single point of entry
+def script_initialize(*args, **kwargs):
+    """Initialize script-style tests without running any tests."""
+    execute_setup_common(*args, **kwargs)
+
+# This is called from script-style iotests with a single point of entry
 def script_main(test_function, *args, **kwargs):
     """Run script-style tests outside of the unittest framework"""
-    execute_test(test_function, *args, **kwargs)
+    execute_test(*args, test_function=test_function, **kwargs)
 
+# This is called from unittest style iotests
 def main(*args, **kwargs):
     """Run tests using the unittest framework"""
-    execute_test(None, *args, **kwargs)
+    execute_test(*args, **kwargs)
-- 
2.21.1