enable building a source package by name and version

If a package is specified by name, it is downloaded inside the chroot
using the embedded deb-src uris. sbuild implements this natively,
pbuilder does not implement this yet, but there is #988419 and
mmdebstrap can make it work.

1 files changed, 14 insertions, 2 deletions

diff --git a/mdbp/mmdebstrap.py b/mdbp/mmdebstrap.py
index 62d3195..0a7dba4 100644
--- a/mdbp/mmdebstrap.py
+++ b/mdbp/mmdebstrap.py
@@ -3,6 +3,7 @@
 """mdbp backend using mmdebstrap"""
 
 import argparse
+import contextlib
 import ctypes
 import ctypes.util
 import functools
@@ -67,10 +68,20 @@ def hook_main(buildjsonfilename: str, chrootname: str) -> None:
     if "dscpath" in build["input"]:
         dscpath = fullbuildpath.parent / \
                 pathlib.PurePath(build["input"]["dscpath"]).name
-    else:
+    elif "dscuri" in build["input"]:
         dscpath = download_dsc(build["input"], fullbuildpath.parent)
     priv_drop(["chown", "-R", "build:build", "."],
                chroot=chroot, chdir=buildpath.parent)
+    apt_get = ["apt-get", "--yes", "-oAPT::Keep-Downloaded-Packages=false"]
+    if "sourcename" in build["input"]:
+        sourcename = build["input"]["sourcename"]
+        with contextlib.suppress(KeyError):
+            sourcename += "=" + build["input"]["version"]
+        priv_drop([*apt_get, "--only-source", "--download-only", "source",
+                   sourcename],
+                  chroot=chroot, chdir=buildpath.parent, setuid="build")
+        [dscpath] = fullbuildpath.parent.glob(build["input"]["sourcename"] +
+                                              "_*.dsc")
     priv_drop(["dpkg-source", "--no-check", "--extract", dscpath.name,
                buildpath.name],
               setuid="build", chroot=chroot, chdir=buildpath.parent)
@@ -78,7 +89,6 @@ def hook_main(buildjsonfilename: str, chrootname: str) -> None:
         path.unlink()
     hostarch = build.get("hostarch") or build.get("buildarch") or \
             native_architecture()
-    apt_get = ["apt-get", "--yes", "-oAPT::Keep-Downloaded-Packages=false"]
     cmd = [*apt_get, "build-dep", "--host-architecture", hostarch,
            *dict(any=["--arch-only"],
                  all=["--indep-only"]).get(build.get("type"), ()),
@@ -182,6 +192,8 @@ def main() -> None:
         build["distribution"],
         "/dev/null",
         args.mirror,
+        *(["deb-src %s %s main" % (args.mirror, build["distribution"])]
+          if "sourcename" in build["input"] else ()),
         *build.get("extrarepositories", ()),
     ]
     proc = subprocess.Popen(cmd,