pbuilder: implement support for build_path

1 files changed, 5 insertions, 2 deletions

diff --git a/mdbp/pbuilder.py b/mdbp/pbuilder.py
index 052dce8..1c1782a 100644
--- a/mdbp/pbuilder.py
+++ b/mdbp/pbuilder.py
@@ -44,8 +44,6 @@ def main() -> None:
     if "bd-uninstallable-explainer" in build:
         raise ValueError("bd-uninstallable-explainer %r not supported" %
                          build["bd-uinstallable-explainer"])
-    if build.get("build_path"):
-        raise ValueError("build_path not supported")
     if build["distribution"] in ("sid", "unstable"):
         basetgz = None
     else:
@@ -80,6 +78,11 @@ def main() -> None:
         cmd.extend(["--loglevel", "E"])
     apt_get = ["apt-get", "-oAPT::Keep-Downloaded-Path=false", "--yes"]
     with contextlib.ExitStack() as stack:
+        if build.get("build_path"):
+            rcfile = stack.enter_context(tempfile.NamedTemporaryFile("w"))
+            rcfile.write("BUILDDIR=%s\n" % shlex.quote(build["build_path"]))
+            rcfile.flush()
+            cmd.extend(["--configfile", rcfile.name])
         hookdir = pathlib.Path(
             stack.enter_context(tempfile.TemporaryDirectory()))
         hook = hookdir / "D50aptupdate"