Try installing pre-releases of only direct requirements

.github/workflows/main.yml

@@ -60,14 +60,26 @@ jobs:
     continue-on-error: true
     steps:
     - uses: actions/checkout@v2
+    - run: git fetch --prune --unshallow
     - uses: actions/setup-python@v2
       with:
         python-version: 3.8.x
+    - uses: actions/cache@v1
+      with:
+        path: ~/.cache/pip
+        key: pip-ubuntu-latest-py3.8-${{ hashFiles('Pipfile.lock') }}
+        restore-keys: |
+          pip-ubuntu-latest-py3.8-${{ hashFiles('Pipfile.lock') }}
+          pip-ubuntu-latest-py3.8-
+    - uses: actions/cache@v1
+      with:
+        path: ~/.local/share/virtualenvs
+        key: virtualenvs-ubuntu-latest-py3.8-${{ hashFiles('Pipfile.lock') }}
+        restore-keys: |
+          virtualenvs-ubuntu-latest-py3.8-${{ hashFiles('Pipfile.lock') }}
+          virtualenvs-ubuntu-latest-py3.8-
     - run: pip install -U -I --pre pipenv pip
-    - run: pipenv lock --dev --pre --requirements | awk -F= '{ print $1 }' >requirements-unlocked.txt
-    - run: pipenv run pip install --pre -r requirements-unlocked.txt
-    - run: pipenv run pip freeze
-    - run: rm -vf requirements-unlocked.txt
+    - run: make deps-prerelease
     - run: make fmt
     - run: make lint
     - run: pipenv run python setup.py --version

.gitignore

@@ -9,6 +9,7 @@
 /.idea/
 /.jupyter/
 /.local/
+/.pipenv-requires
 /build/
 /dist/
 /node_modules/

Makefile

@@ -65,6 +65,10 @@ fmt-3.5: .fmt-unsupported
 	@echo ERROR: This python version cannot run the fmting tools
 	@exit 1
 
+.PHONY: deps-prerelease
+deps-prerelease:
+	pipenv run ./scripts/install-deps-prerelease
+
 deps-%:
 	$(RUNNER) 'pipenv run ./scripts/install-deps'
 

scripts/install-deps

@@ -1,18 +1,23 @@
 #!/usr/bin/env bash
 set -o errexit
 set -o pipefail
-set -o xtrace
 
-case "${PYTHON_VERSION}" in
-2* | 3.5*)
-  pipenv install --skip-lock
-  pipenv run pip install \
-    pytest \
-    pytest-cov \
-    'coverage[toml]' \
-    setuptools_scm
-  ;;
-*)
-  pipenv install --dev
-  ;;
-esac
+main() {
+  set -o xtrace
+
+  case "${PYTHON_VERSION}" in
+  2* | 3.5*)
+    pipenv install --skip-lock
+    pipenv run pip install \
+      pytest \
+      pytest-cov \
+      'coverage[toml]' \
+      setuptools_scm
+    ;;
+  *)
+    pipenv install --dev
+    ;;
+  esac
+}
+
+main "${@}"

scripts/install-deps-prerelease

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+set -o errexit
+set -o pipefail
+
+main() {
+  set -o xtrace
+
+  local top
+  top="$(git rev-parse --show-toplevel)"
+
+  local pipenv_requires="${top}/.pipenv-requires"
+
+  pipenv install --dev
+  _print_pipfile_packages >"${pipenv_requires}"
+  pipenv run pip install -U --pre -r "${pipenv_requires}"
+  rm -f "${pipenv_requires}"
+}
+
+_print_pipfile_packages() {
+  pipenv run python <<PYTHON
+import toml
+
+for package in toml.load(open("${top}/Pipfile")).get("packages").keys():
+    print(package)
+PYTHON
+}
+
+main "${@}"

setup.cfg

@@ -20,6 +20,9 @@ install_requires =
     click>=7.0.0
 setup_requires =
     setuptools
+    setuptools_scm>=3.4
+    toml
+    wheel
 packages = rsconnect
 python_requires = >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*
 zip_safe = true