1 files changed, 67 insertions, 0 deletions
diff --git a/src/debputy/version.py b/src/debputy/version.py
new file mode 100644
index 0000000..de56318
--- /dev/null
+++ b/src/debputy/version.py
@@ -0,0 +1,67 @@
+from typing import Optional, Callable
+
+__version__ = "N/A"
+
+IS_RELEASE_BUILD = False
+
+if __version__ in ("N/A",):
+    import subprocess
+
+    class LazyString:
+        def __init__(self, initializer: Callable[[], str]) -> None:
+            self._initializer = initializer
+            self._value: Optional[str] = None
+
+        def __str__(self) -> str:
+            value = object.__getattribute__(self, "_value")
+            if value is None:
+                value = object.__getattribute__(self, "_initializer")()
+                object.__setattr__(self, "_value", value)
+            return value
+
+        def __getattribute__(self, item):
+            value = str(self)
+            return getattr(value, item)
+
+        def __contains__(self, item):
+            return item in str(self)
+
+    def _initialize_version() -> str:
+        try:
+            devnull: Optional[int] = subprocess.DEVNULL
+        except AttributeError:
+            devnull = None  # Not supported, but not critical
+
+        try:
+            v = (
+                subprocess.check_output(
+                    ["git", "describe", "--tags"],
+                    stderr=devnull,
+                )
+                .strip()
+                .decode("utf-8")
+            )
+        except (subprocess.CalledProcessError, FileNotFoundError):
+            try:
+                v = (
+                    subprocess.check_output(
+                        ["dpkg-parsechangelog", "-SVersion"],
+                        stderr=devnull,
+                    )
+                    .strip()
+                    .decode("utf-8")
+                )
+
+            except (subprocess.CalledProcessError, FileNotFoundError):
+                v = "N/A"
+
+        if v.startswith("debian/"):
+            v = v[7:]
+        return v
+
+    __version__ = LazyString(_initialize_version)
+    IS_RELEASE_BUILD = False
+
+else:
+    # Disregard snapshot versions (gbp dch -S) as "release builds"
+    IS_RELEASE_BUILD = ".gbp" not in __version__