Add "pmbootstrap build --no-depends" (!1769)

Aborts the build if any dependencies would have to be build first. This
is useful for build.postmarketos.org, because we want to build exactly
one package in one build job. If dependencies would need to be built, we
made a mistake earlier, and not aborting the build makes it harder to
find that orginal mistake.

pmb/build/_package.py

@@ -140,13 +140,22 @@ def build_depends(args, apkbuild, arch, strict):
     logging.verbose(pkgname + ": build/install dependencies: " +
                     ", ".join(depends))
 
-    # Build them
+    # --no-depends: check for binary packages
     depends_built = []
-    for depend in depends:
-        if package(args, depend, arch, strict=strict):
-            depends_built += [depend]
-    logging.verbose(pkgname + ": build dependencies: done, built: " +
-                    ", ".join(depends_built))
+    if "no_depends" in args and args.no_depends:
+        for depend in depends:
+            if not pmb.parse.apkindex.package(args, depend, arch, False):
+                raise RuntimeError("Missing binary package for dependency '" +
+                                   depend + "' of '" + pkgname + "', but"
+                                   " pmbootstrap won't build any depends since"
+                                   " it was started with --no-depends.")
+    else:
+        # Build the dependencies
+        for depend in depends:
+            if package(args, depend, arch, strict=strict):
+                depends_built += [depend]
+        logging.verbose(pkgname + ": build dependencies: done, built: " +
+                        ", ".join(depends_built))
 
     return (depends, depends_built)
 

pmb/parse/arguments.py

@@ -496,6 +496,9 @@ def arguments():
                        " you don't need to build and install the kernel. But it"
                        " is incompatible with how Alpine's abuild handles it.",
                        dest="ignore_depends")
+    build.add_argument("-n", "--no-depends", action="store_true",
+                       help="never build dependencies, abort instead",
+                       dest="no_depends")
     build.add_argument("--envkernel", action="store_true",
                        help="Create an apk package from the build output of"
                        " a kernel compiled with envkernel.sh.")

test/test_build_package.py

@@ -174,6 +174,26 @@ def test_build_depends(args, monkeypatch):
     assert func(args, apkbuild, "armhf", False) == (["a", "b"], ["a", "b"])
 
 
+def test_build_depends_no_binary_error(args, monkeypatch):
+    # Shortcut and fake apkbuild
+    func = pmb.build._package.build_depends
+    apkbuild = {"pkgname": "test", "depends": ["some-invalid-package-here"],
+                "makedepends": [], "checkdepends": [], "subpackages": [],
+                "options": []}
+
+    # pmbootstrap build --no-depends
+    args.no_depends = True
+
+    # Missing binary package error
+    with pytest.raises(RuntimeError) as e:
+        func(args, apkbuild, "armhf", True)
+    assert str(e.value).startswith("Missing binary package for dependency")
+
+    # All depends exist
+    apkbuild["depends"] = ["alpine-base"]
+    assert func(args, apkbuild, "armhf", True) == (["alpine-base"], [])
+
+
 def test_is_necessary_warn_depends(args, monkeypatch):
     # Shortcut and fake apkbuild
     func = pmb.build._package.is_necessary_warn_depends