[PATCH 1/5] iotests: explicitly pass source/build dir to 'check' command

["Daniel P. Berrangé" <berrange@redhat.com>]

The 'check' script has some rather dubious logic whereby it assumes
that if invoked as a symlink, then it is running from a separate
source tree and build tree, otherwise it assumes the current working
directory is a combined source and build tree.

This doesn't work if you want to invoke the 'check' script using
its full source tree path while still using a split source and build
tree layout. This would be a typical situation with meson if you ask
it to find the 'check' script path using files('check').

Rather than trying to make the logic more magical, add support for
explicitly passing the dirs using --source-dir and --build-dir. If
either is omitted the current logic is maintained.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 tests/qemu-iotests/check      |  8 +++++++-
 tests/qemu-iotests/testenv.py | 17 +++++++++++++----
 2 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/tests/qemu-iotests/check b/tests/qemu-iotests/check
index 9bdda1394e..806abc21d6 100755
--- a/tests/qemu-iotests/check
+++ b/tests/qemu-iotests/check
@@ -113,6 +113,10 @@ def make_argparser() -> argparse.ArgumentParser:
                        'middle of the process.')
     g_sel.add_argument('tests', metavar='TEST_FILES', nargs='*',
                        help='tests to run, or "--" followed by a command')
+    g_sel.add_argument('--build-dir', default=None,
+                       help='Path to iotests build directory')
+    g_sel.add_argument('--source-dir', default=None,
+                       help='Path to iotests build directory')
 
     return p
 
@@ -124,7 +128,9 @@ if __name__ == '__main__':
                   aiomode=args.aiomode, cachemode=args.cachemode,
                   imgopts=args.imgopts, misalign=args.misalign,
                   debug=args.debug, valgrind=args.valgrind,
-                  gdb=args.gdb, qprint=args.print)
+                  gdb=args.gdb, qprint=args.print,
+                  source_dir=args.source_dir,
+                  build_dir=args.build_dir)
 
     if len(sys.argv) > 1 and sys.argv[-len(args.tests)-1] == '--':
         if not args.tests:
diff --git a/tests/qemu-iotests/testenv.py b/tests/qemu-iotests/testenv.py
index a864c74b12..9bf37cd381 100644
--- a/tests/qemu-iotests/testenv.py
+++ b/tests/qemu-iotests/testenv.py
@@ -177,7 +177,9 @@ def __init__(self, imgfmt: str, imgproto: str, aiomode: str,
                  debug: bool = False,
                  valgrind: bool = False,
                  gdb: bool = False,
-                 qprint: bool = False) -> None:
+                 qprint: bool = False,
+                 source_dir: Optional[str] = None,
+                 build_dir: Optional[str] = None) -> None:
         self.imgfmt = imgfmt
         self.imgproto = imgproto
         self.aiomode = aiomode
@@ -213,12 +215,19 @@ def __init__(self, imgfmt: str, imgproto: str, aiomode: str,
 
         if os.path.islink(sys.argv[0]):
             # called from the build tree
-            self.source_iotests = os.path.dirname(os.readlink(sys.argv[0]))
-            self.build_iotests = os.path.dirname(os.path.abspath(sys.argv[0]))
+            self.source_iotests = os.path.dirname(
+                os.readlink(sys.argv[0]))
+            self.build_iotests = os.path.dirname(
+                os.path.abspath(sys.argv[0]))
         else:
             # called from the source tree
             self.source_iotests = os.getcwd()
-            self.build_iotests = self.source_iotests
+            self.build_iotests = os.getcwd()
+
+        if source_dir is not None:
+            self.source_iotests = source_dir
+        if build_dir is not None:
+            self.build_iotests = build_dir
 
         self.build_root = os.path.join(self.build_iotests, '..', '..')
 
-- 
2.39.2