Skip satisfied dependencies during installation

news/3057.feature.rst

@@ -0,0 +1 @@
+``pipenv install`` and ``pipenv sync`` will no longer attempt to install satisfied dependencies during installation.

pipenv/core.py

@@ -735,6 +735,9 @@ def batch_install(deps_list, procs, failed_deps_queue,
 
     deps_to_install = deps_list[:]
     deps_to_install.extend(sequential_deps)
+    deps_to_install = [
+        dep for dep in deps_to_install if not project.environment.is_satisfied(dep)
+    ]
     sequential_dep_names = [d.name for d in sequential_deps]
 
     deps_list_bar = progress.bar(

pipenv/environment.py

@@ -19,12 +19,14 @@
 import pipenv
 
 from .vendor.cached_property import cached_property
+from .vendor.packaging.utils import canonicalize_name
 from .vendor import vistir
 
 from .utils import normalize_path, make_posix
 
 
 BASE_WORKING_SET = pkg_resources.WorkingSet(sys.path)
+# TODO: Unittests for this class
 
 
 class Environment(object):
@@ -712,6 +714,33 @@ def is_installed(self, pkgname):
 
         return any(d for d in self.get_distributions() if d.project_name == pkgname)
 
+    def is_satisfied(self, req):
+        match = next(
+            iter(
+                d for d in self.get_distributions()
+                if canonicalize_name(d.project_name) == req.normalized_name
+            ), None
+        )
+        if match is not None:
+            if req.editable and req.line_instance.is_local and self.find_egg(match):
+                requested_path = req.line_instance.path
+                return requested_path and vistir.compat.samefile(requested_path, match.location)
+            elif match.has_metadata("direct_url.json"):
+                direct_url_metadata = json.loads(match.get_metadata("direct_url.json"))
+                commit_id = direct_url_metadata.get("vcs_info", {}).get("commit_id", "")
+                vcs_type = direct_url_metadata.get("vcs_info", {}).get("vcs", "")
+                _, pipfile_part = req.as_pipfile().popitem()
+                return (
+                    vcs_type == req.vcs and commit_id == req.commit_hash
+                    and direct_url_metadata["url"] == pipfile_part[req.vcs]
+                )
+            elif req.line_instance.specifiers is not None:
+                return req.line_instance.specifiers.contains(
+                    match.version, prereleases=True
+                )
+            return True
+        return False
+
     def run(self, cmd, cwd=os.curdir):
         """Run a command with :class:`~subprocess.Popen` in the context of the environment
 

tasks/vendoring/patches/vendor/vistir-imports.patch

@@ -15,30 +15,32 @@ diff --git a/pipenv/vendor/vistir/compat.py b/pipenv/vendor/vistir/compat.py
 index b5904bc7..a44aafbe 100644
 --- a/pipenv/vendor/vistir/compat.py
 +++ b/pipenv/vendor/vistir/compat.py
-@@ -43,7 +43,7 @@ __all__ = [
+@@ -55,7 +55,7 @@ __all__ = [
  if sys.version_info >= (3, 5):  # pragma: no cover
      from pathlib import Path
  else:  # pragma: no cover
 -    from pathlib2 import Path
 +    from pipenv.vendor.pathlib2 import Path
 
- if six.PY3:  # pragma: no cover
+ if sys.version_info >= (3, 4):  # pragma: no cover
      # Only Python 3.4+ is supported
-@@ -53,14 +53,14 @@ if six.PY3:  # pragma: no cover
-     from weakref import finalize
+@@ -85,8 +85,8 @@ if sys.version_info >= (3, 4):  # pragma: no cover
+
  else:  # pragma: no cover
      # Only Python 2.7 is supported
 -    from backports.functools_lru_cache import lru_cache
-+    from pipenv.vendor.backports.functools_lru_cache import lru_cache
-     from .backports.functools import partialmethod  # type: ignore
 -    from backports.shutil_get_terminal_size import get_terminal_size
++    from pipenv.vendor.backports.functools_lru_cache import lru_cache
 +    from pipenv.vendor.backports.shutil_get_terminal_size import get_terminal_size
+     from .backports.functools import partialmethod  # type: ignore
      from .backports.surrogateescape import register_surrogateescape
+     from collections import (
+@@ -110,7 +110,7 @@ else:  # pragma: no cover
 
      register_surrogateescape()
      NamedTemporaryFile = _NamedTemporaryFile
 -    from backports.weakref import finalize  # type: ignore
 +    from pipenv.vendor.backports.weakref import finalize  # type: ignore
 
- try:
-     # Introduced Python 3.5
+     try:
+         from os.path import samefile