fix(pip): set --no-binary=:all: if possible (#1740)

This reduces the chances of having pip install binary packages as
indirect dependencies.

Partial fix for #1473

charmcraft/utils/package.py

@@ -103,21 +103,25 @@ def get_pip_command(
     binary_packages = get_pypi_packages(binary_deps)
     requirements_packages = get_requirements_file_package_names(*requirements_files)
     all_packages = charm_packages | binary_packages | requirements_packages
-    source_only_packages = sorted(
-        get_package_names(all_packages) - get_package_names(binary_packages)
-    )
-
     non_requirements_packages = sorted(
         exclude_packages(
             set(source_deps) | set(binary_deps),
             excluded=get_package_names(requirements_packages),
         )
     )
 
-    if source_only_packages:
-        no_binary = [f"--no-binary={','.join(source_only_packages)}"]
-    else:
-        no_binary = []
+    if not binary_packages:
+        return [
+            *prefix,
+            "--no-binary=:all:",
+            *(f"--requirement={path}" for path in requirements_files),
+            *non_requirements_packages,
+        ]
+
+    source_only_packages = sorted(
+        get_package_names(all_packages) - get_package_names(binary_packages)
+    )
+    no_binary = [f"--no-binary={','.join(source_only_packages)}"] if source_only_packages else ()
 
     return [
         *prefix,

tests/unit/utils/test_package.py

@@ -109,6 +109,8 @@ def test_get_requirements_file_package_names(tmp_path, file_contents, expected):
             "--no-binary=abc,ghi",
             ["ghi", "jkl"],
         ),
+        (["abc==1.0.0", "def>=1.2.3"], [], [], "--no-binary=:all:", []),
+        ([], ["abc==1.0.0", "def>=1.2.3"], [], "--no-binary=:all:", ["abc==1.0.0", "def>=1.2.3"]),
     ],
 )
 @pytest.mark.parametrize("prefix", [["/bin/pip"], ["/some/path/to/pip3"], ["pip", "--some-param"]])