Repository: jupyterhub/repo2docker (language: python)

Issue:
Jupyterhub 3, separate Python kernel env from notebook/jupyterlab env
This is an experimental PR to add JupyterHub 3.0.0 for all Python versions by separating the kernel environment from the notebook/lab environment. This is already done for Python 2.7, and this PR extends it to all Python versions so we don't have to worry about compatibility between JupyerLab/JupyterHub and the kernel environments.

I've no idea how usable this will be in practice....

- Closes https://github.com/jupyterhub/repo2docker/issues/741
- Closes https://github.com/jupyterhub/repo2docker/issues/1195
- Closes https://github.com/jupyterhub/repo2docker/issues/956


Discussion / hints:
Practically there are several problems:
- `environment.yml` and `requirements.txt` modify the kernel environment, this means you can't modify the notebook/JupyterLab environment by installing extensions in these files.
  - Interestingly there's support for using a `requirements3.txt` file to install packages into the notebook/lab environment. The `3` in the name originates from when this was implemented for Python 2 only, and an additional package file was needed for notebook/lab running under Python 3:
  - https://github.com/jupyterhub/repo2docker/blob/e0d5b9bb63a7908b4edd9e6b6d5ca51d47fd9aaf/repo2docker/buildpacks/python/__init__.py#L48-L53
  - `requirements3.txt` is not documented, though it's been in the codebase more or less forever https://github.com/jupyterhub/repo2docker/commit/d77bcb4ecd6f20319f68f9522de60d77ca893375
- Some tests fail because they're now run in the wrong environment
- Some tests fail because they try to enable a Jupyter extension, but can't because the extension is installed in the kernel environment

These can be worked around, but given the impact we need to decide our overall approach. If we decide on seperate kernel and notebook environments for everything we'll probably need to introduce something like `environment-notebook.yml` `requirements-notebook.txt` (or continue using `requirements3.txt` though the name is misleading).

An alternative quick fix is to only put Python 3.5 and 3.6 into seperate kernel environments, so the shared notebook/kernel environment is kept for Python 3.7+. However at some point JupyterLab will drop Python 3.7 and we'll be faced with the same problem.
There are some tricky issues with separating the server env from the kernel env, especially involving things like widgets that include both a kernel and frontend component. For that reason, I don't think we should have separate envs by default, or even in most cases.

Separating the envs solve a lot of problems for us on mybinder.org, because we want to control some aspects of the server env, but don't care much about the kernel env, but this is in conflict with the folks who use binder to e.g. demo prototype JupyterLab features, widgets, UI extensions, etc., which must be in the server env.

I _do_ think better support for separation of the server and kernel env will let us be more proactive in upgrading the server env, e.g. having the kernel-only env for 'less supported' runtime versions. We already do this for py2, but I think it would be appropriate to be doing the same with 3.5 and 3.6 - i.e. saying you can still get a 3.6 _kernel_, but we can't keep supporting a 3.6 _server_. That would mean folks sticking to old Python for a UI demo will break sooner than folks sticking to old Python for kernel-only behavior, which I think reflects the reality of targeting those two areas.

But even doing that, folks with older kernels will not have working widgets (eventually, if not immediately) because the versions won't match.

That would mean generalizing the 'separate kernel from notebook' behavior a bit beyond py2 (and applying it to Python <=3.6 from now on), but still not doing it by default.

What do folks think?
A third option, though it's a lot more work: split jupyterhub-singleuser into a separate package, and add support for older python versions?
Yeah, I think we'll probably split jupyterhub-singleuser out _someday_, but I think the development is still too tightly integrated with hub at this point.

Yet another option is to keep the older versions as single envs, but explicitly exclude `jupyterhub-singleuser` from the older versions (or pin older versions). The freeze machinery does already have the infrastructure for different versions to have different base envs, I believe. This same issue is going to come up eventually for old Pythons for every package, not just jupyterhub-singleuser.

Fix patch:
diff --git a/repo2docker/buildpacks/conda/__init__.py b/repo2docker/buildpacks/conda/__init__.py
index 66aff037a..9a3c97be2 100644
--- a/repo2docker/buildpacks/conda/__init__.py
+++ b/repo2docker/buildpacks/conda/__init__.py
@@ -1,10 +1,12 @@
 """BuildPack for conda environments"""
 import os
 import re
+import warnings
 from collections.abc import Mapping
 
 from ruamel.yaml import YAML
 
+from ...semver import parse_version as V
 from ...utils import is_local_pip_requirement
 from .._r_base import rstudio_base_scripts
 from ..base import BaseImage
@@ -98,7 +100,7 @@ def get_path(self):
         """
         path = super().get_path()
         path.insert(0, "${CONDA_DIR}/bin")
-        if self.py2:
+        if self.separate_kernel_env:
             path.insert(0, "${KERNEL_PYTHON_PREFIX}/bin")
         path.insert(0, "${NB_PYTHON_PREFIX}/bin")
         # This is at the end of $PATH, for backwards compat reasons
@@ -172,20 +174,24 @@ def get_build_script_files(self):
         frozen_name = f"environment-{self._conda_platform()}.lock"
         pip_frozen_name = "requirements.txt"
         if py_version:
-            if self.python_version == "2.7":
-                if "linux-64" != self._conda_platform():
+            conda_platform = self._conda_platform()
+            if self.separate_kernel_env:
+                self.log.warning(
+                    f"User-requested packages for legacy Python version {py_version} will be installed in a separate kernel environment.\n"
+                )
+                lockfile_name = f"environment.py-{py_version}-{conda_platform}.lock"
+                if not os.path.exists(os.path.join(HERE, lockfile_name)):
                     raise ValueError(
-                        f"Python version 2.7 {self._conda_platform()} is not supported!"
+                        f"Python version {py_version} on {conda_platform} is not supported!"
                     )
-
-                # python 2 goes in a different env
                 files[
-                    "conda/environment.py-2.7-linux-64.lock"
+                    f"conda/{lockfile_name}"
                 ] = self._kernel_environment_file = "/tmp/env/kernel-environment.lock"
-                # additional pip requirements for kernel env
-                if os.path.exists(os.path.join(HERE, "requirements.py-2.7.txt")):
+
+                requirements_file_name = f"requirements.py-{py_version}.pip"
+                if os.path.exists(os.path.join(HERE, requirements_file_name)):
                     files[
-                        "conda/requirements.py-2.7.txt"
+                        f"conda/{requirements_file_name}"
                     ] = (
                         self._kernel_requirements_file
                     ) = "/tmp/env/kernel-requirements.txt"
@@ -333,8 +339,26 @@ def uses_r(self):
     @property
     def py2(self):
         """Am I building a Python 2 kernel environment?"""
+        warnings.warn(
+            "CondaBuildPack.py2 is deprecated in 2023.2. Use CondaBuildPack.separate_kernel_env.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
         return self.python_version and self.python_version.split(".")[0] == "2"
 
+    # Python versions _older_ than this get a separate kernel env
+    kernel_env_cutoff_version = "3.7"
+
+    @property
+    def separate_kernel_env(self):
+        """Whether the kernel should be installed into a separate env from the server
+
+        Applies to older versions of Python that aren't kept up-to-date
+        """
+        return self.python_version and V(self.python_version) < V(
+            self.kernel_env_cutoff_version
+        )
+
     def get_preassemble_script_files(self):
         """preassembly only requires environment.yml
 
@@ -352,7 +376,11 @@ def get_env_scripts(self):
         """Return series of build-steps specific to this source repository."""
         scripts = []
         environment_yml = self.binder_path("environment.yml")
-        env_prefix = "${KERNEL_PYTHON_PREFIX}" if self.py2 else "${NB_PYTHON_PREFIX}"
+        env_prefix = (
+            "${KERNEL_PYTHON_PREFIX}"
+            if self.separate_kernel_env
+            else "${NB_PYTHON_PREFIX}"
+        )
         if os.path.exists(environment_yml):
             # TODO: when using micromamba, we call $MAMBA_EXE install -p ...
             # whereas mamba/conda need `env update -p ...` when it's an env.yaml file
diff --git a/repo2docker/buildpacks/conda/environment-linux-64.lock b/repo2docker/buildpacks/conda/environment-linux-64.lock
index 84f3a5bc9..c185ab8bb 100644
--- a/repo2docker/buildpacks/conda/environment-linux-64.lock
+++ b/repo2docker/buildpacks/conda/environment-linux-64.lock
@@ -1,42 +1,34 @@
 # AUTO GENERATED FROM environment.py-3.7.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2023-01-23 11:59:03 UTC
+# Frozen on 2023-02-03 12:33:27 UTC
 # Generated by conda-lock.
 # platform: linux-64
-# input_hash: 3b780a798011d21422fbbea52f1c94325fc806c944f506d41d0bdf397b93c604
+# input_hash: 56d66ed1f6b5535bd09b3fb8546cc5bdb3cea65aa2ed89ffaf52424a63c739aa
 @EXPLICIT
 https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2#d7c89558ba9fa0495403155b64376d81
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-https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.39-hcc3a1bd_1.conda#737be0d34c22d24432049ab7a3214de4
+https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.40-h41732ed_0.conda#7aca3059a1729aa76c597603f10b0dd3
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-https://conda.anaconda.org/conda-forge/linux-64/libev-4.33-h516909a_1.tar.bz2#6f8720dff19e17ce5d48cfe7f3d2f0a3
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-https://conda.anaconda.org/conda-forge/linux-64/openssl-3.0.7-h0b41bf4_1.conda#7adaac6ff98219bcb99b45e408b80f4e
+https://conda.anaconda.org/conda-forge/linux-64/openssl-3.0.7-h0b41bf4_2.conda#45758f4ece9c8b7b5f99328bd5caae51
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-https://conda.anaconda.org/conda-forge/linux-64/libedit-3.1.20191231-he28a2e2_2.tar.bz2#4d331e44109e3f0e19b4cb8f9b82f3e1
-https://conda.anaconda.org/conda-forge/linux-64/libnghttp2-1.51.0-hff17c54_0.conda#dd682f0b6d65e75b2bc868fc8e93d87e
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-https://conda.anaconda.org/conda-forge/linux-64/krb5-1.20.1-h81ceb04_0.conda#89a41adce7106749573d883b2f657d78
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-https://conda.anaconda.org/conda-forge/linux-64/libcurl-7.87.0-hdc1c0ab_0.conda#bc302fa1cf8eda15c60f669b7524a320
 https://conda.anaconda.org/conda-forge/linux-64/python-3.7.12-hf930737_100_cpython.tar.bz2#416558a6f46b7a1fa8db7d0e98aff56a
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@@ -64,11 +56,10 @@ https://conda.anaconda.org/conda-forge/noarch/pandocfilters-1.5.0-pyhd8ed1ab_0.t
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-https://conda.anaconda.org/conda-forge/noarch/prometheus_client-0.15.0-pyhd8ed1ab_0.tar.bz2#b260ed41427dbbe70537b3030c643b2e
+https://conda.anaconda.org/conda-forge/noarch/prometheus_client-0.16.0-pyhd8ed1ab_0.conda#8efaddc1c8b8ce262c4d1a7c6571c799
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-https://conda.anaconda.org/conda-forge/linux-64/pycurl-7.45.1-py37he47804d_2.tar.bz2#0526f65c005f87b012a11f6204fb8052
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@@ -78,24 +69,24 @@ https://conda.anaconda.org/conda-forge/noarch/pytz-2022.7.1-pyhd8ed1ab_0.conda#f
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-https://conda.anaconda.org/conda-forge/noarch/setuptools-66.1.1-pyhd8ed1ab_0.conda#9467d520d1457018e055bbbfdf9b7567
+https://conda.anaconda.org/conda-forge/noarch/setuptools-67.1.0-pyhd8ed1ab_0.conda#845dae446df791b5e1a3eaa6454640c1
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-https://conda.anaconda.org/conda-forge/noarch/traitlets-5.8.1-pyhd8ed1ab_0.conda#ef5179bcc6a9acc23b12ac92936e05ab
+https://conda.anaconda.org/conda-forge/noarch/traitlets-5.9.0-pyhd8ed1ab_0.conda#d0b4f5c87cd35ac3fb3d47b223263a64
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+https://conda.anaconda.org/conda-forge/noarch/websocket-client-1.5.0-pyhd8ed1ab_0.conda#6df990e93f39e91a3f45d4d885404d56
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-https://conda.anaconda.org/conda-forge/noarch/zipp-3.11.0-pyhd8ed1ab_0.conda#09b5b885341697137879a4f039a9e5a1
+https://conda.anaconda.org/conda-forge/noarch/zipp-3.12.0-pyhd8ed1ab_0.conda#edc3568566cc48335f0b5d86d40fdbb9
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+https://conda.anaconda.org/conda-forge/noarch/beautifulsoup4-4.11.2-pyha770c72_0.conda#88b59f6989f0ed5ab3433af0b82555e1
+https://conda.anaconda.org/conda-forge/noarch/bleach-6.0.0-pyhd8ed1ab_0.conda#d48b143d01385872a88ef8417e96c30e
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@@ -104,7 +95,7 @@ https://conda.anaconda.org/conda-forge/noarch/jinja2-3.1.2-pyhd8ed1ab_1.tar.bz2#
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diff --git a/repo2docker/buildpacks/conda/environment-linux-aarch64.lock b/repo2docker/buildpacks/conda/environment-linux-aarch64.lock
index ed64b223c..a922aef01 100644
--- a/repo2docker/buildpacks/conda/environment-linux-aarch64.lock
+++ b/repo2docker/buildpacks/conda/environment-linux-aarch64.lock
@@ -1,41 +1,33 @@
 # AUTO GENERATED FROM environment.py-3.7.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2023-01-23 12:00:09 UTC
+# Frozen on 2023-02-03 12:33:35 UTC
 # Generated by conda-lock.
 # platform: linux-aarch64
-# input_hash: 0a4a7f1713025e05325e2cb2a1336c042deaeb35413c3a951b07a3c8e06390a6
+# input_hash: 5d827030b8550a7c54b1799a2f8975f8c422c8cd7f555193fcd4912380c6d3cb
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+https://conda.anaconda.org/conda-forge/noarch/prometheus_client-0.16.0-pyhd8ed1ab_0.conda#8efaddc1c8b8ce262c4d1a7c6571c799
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diff --git a/repo2docker/buildpacks/conda/environment.py-3.10-linux-64.lock b/repo2docker/buildpacks/conda/environment.py-3.10-linux-64.lock
index 7e92bdc0d..a934da5e8 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.10-linux-64.lock
+++ b/repo2docker/buildpacks/conda/environment.py-3.10-linux-64.lock
@@ -1,12 +1,12 @@
 # AUTO GENERATED FROM environment.py-3.10.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2023-01-23 12:08:19 UTC
+# Frozen on 2023-02-03 12:34:24 UTC
 # Generated by conda-lock.
 # platform: linux-64
-# input_hash: a3c35e1cf5cf3f900f8a304aa0b72221317c0c98cea5f5f807e9f50a631a6799
+# input_hash: 9fd16b0f6d64e86a62e326694b74a429aef5dd7b227a96b4f0e2425851e4e016
 @EXPLICIT
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@@ -25,20 +22,16 @@ https://conda.anaconda.org/conda-forge/linux-64/libuuid-2.32.1-h7f98852_1000.tar
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-https://conda.anaconda.org/conda-forge/linux-64/openssl-3.0.7-h0b41bf4_1.conda#7adaac6ff98219bcb99b45e408b80f4e
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@@ -46,18 +39,17 @@ https://conda.anaconda.org/conda-forge/noarch/backports-1.0-pyhd8ed1ab_3.conda#5
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+https://conda.anaconda.org/conda-forge/linux-64/debugpy-1.6.6-py310heca2aa9_0.conda#1235d03bc69ce4633b802a91ba58b3dd
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@@ -67,7 +59,7 @@ https://conda.anaconda.org/conda-forge/noarch/pandocfilters-1.5.0-pyhd8ed1ab_0.t
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+https://conda.anaconda.org/conda-forge/noarch/prometheus_client-0.16.0-pyhd8ed1ab_0.conda#8efaddc1c8b8ce262c4d1a7c6571c799
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diff --git a/repo2docker/buildpacks/conda/environment.py-3.10-linux-aarch64.lock b/repo2docker/buildpacks/conda/environment.py-3.10-linux-aarch64.lock
index a9c2ef413..3bc2523a4 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.10-linux-aarch64.lock
+++ b/repo2docker/buildpacks/conda/environment.py-3.10-linux-aarch64.lock
@@ -1,11 +1,11 @@
 # AUTO GENERATED FROM environment.py-3.10.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2023-01-23 12:09:22 UTC
+# Frozen on 2023-02-03 12:34:31 UTC
 # Generated by conda-lock.
 # platform: linux-aarch64
-# input_hash: 1d93d4ce5d477d06c8dfeffbc518efe25e14cb1cdb318f4a421b8392b591d068
+# input_hash: c039d9a57d204f210d3832a8744df6e5ed536030655439a29ff883148f704b60
 @EXPLICIT
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+https://conda.anaconda.org/conda-forge/linux-aarch64/ld_impl_linux-aarch64-2.40-h2d8c526_0.conda#16246d69e945d0b1969a6099e7c5d457
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+https://conda.anaconda.org/conda-forge/linux-aarch64/python-3.10.9-ha43d526_0_cpython.conda#24478dd738f2d557efe2a4fc6a248eb3
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diff --git a/repo2docker/buildpacks/conda/environment.py-3.10.yml b/repo2docker/buildpacks/conda/environment.py-3.10.yml
index c6500cee7..afe9cfb21 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.10.yml
+++ b/repo2docker/buildpacks/conda/environment.py-3.10.yml
@@ -1,5 +1,5 @@
 # AUTO GENERATED FROM environment.yml, DO NOT MANUALLY MODIFY
-# Generated on 2023-01-23 12:08:19 UTC
+# Generated on 2023-02-03 12:34:24 UTC
 channels:
 - conda-forge
 dependencies:
@@ -10,6 +10,6 @@ dependencies:
 - jupyter-offlinenotebook==0.2.2
 - jupyter-resource-usage==0.7.0
 - jupyterlab==3.4.8
-- jupyterhub-singleuser==1.5.0
+- jupyterhub-singleuser==3.1.1
 - notebook==6.4.12
 - nteract_on_jupyter==2.1.3
diff --git a/repo2docker/buildpacks/conda/environment.py-3.11-linux-64.lock b/repo2docker/buildpacks/conda/environment.py-3.11-linux-64.lock
new file mode 100644
index 000000000..61cabcfae
--- /dev/null
+++ b/repo2docker/buildpacks/conda/environment.py-3.11-linux-64.lock
@@ -0,0 +1,150 @@
+# AUTO GENERATED FROM environment.py-3.11.yml, DO NOT MANUALLY MODIFY
+# Frozen on 2023-02-03 12:31:38 UTC
+# Generated by conda-lock.
+# platform: linux-64
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diff --git a/repo2docker/buildpacks/conda/environment.py-3.11-linux-aarch64.lock b/repo2docker/buildpacks/conda/environment.py-3.11-linux-aarch64.lock
new file mode 100644
index 000000000..4fd942f4c
--- /dev/null
+++ b/repo2docker/buildpacks/conda/environment.py-3.11-linux-aarch64.lock
@@ -0,0 +1,149 @@
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new file mode 100644
index 000000000..9e7cbfbfe
--- /dev/null
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diff --git a/repo2docker/buildpacks/conda/environment.py-3.11.yml b/repo2docker/buildpacks/conda/environment.py-3.11.yml
new file mode 100644
index 000000000..7c49ec704
--- /dev/null
+++ b/repo2docker/buildpacks/conda/environment.py-3.11.yml
@@ -0,0 +1,15 @@
+# AUTO GENERATED FROM environment.yml, DO NOT MANUALLY MODIFY
+# Generated on 2023-02-03 12:31:38 UTC
+channels:
+- conda-forge
+dependencies:
+- python=3.11.*
+- nodejs=18
+- pip
+- ipywidgets==8.0.2
+- jupyter-offlinenotebook==0.2.2
+- jupyter-resource-usage==0.7.0
+- jupyterlab==3.4.8
+- jupyterhub-singleuser==3.1.1
+- notebook==6.4.12
+- nteract_on_jupyter==2.1.3
diff --git a/repo2docker/buildpacks/conda/environment.py-3.7-linux-64.lock b/repo2docker/buildpacks/conda/environment.py-3.7-linux-64.lock
index 84f3a5bc9..c185ab8bb 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.7-linux-64.lock
+++ b/repo2docker/buildpacks/conda/environment.py-3.7-linux-64.lock
@@ -1,42 +1,34 @@
 # AUTO GENERATED FROM environment.py-3.7.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2023-01-23 11:59:03 UTC
+# Frozen on 2023-02-03 12:33:27 UTC
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@@ -78,24 +69,24 @@ https://conda.anaconda.org/conda-forge/noarch/pytz-2022.7.1-pyhd8ed1ab_0.conda#f
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diff --git a/repo2docker/buildpacks/conda/environment.py-3.7-linux-aarch64.lock b/repo2docker/buildpacks/conda/environment.py-3.7-linux-aarch64.lock
index ed64b223c..a922aef01 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.7-linux-aarch64.lock
+++ b/repo2docker/buildpacks/conda/environment.py-3.7-linux-aarch64.lock
@@ -1,41 +1,33 @@
 # AUTO GENERATED FROM environment.py-3.7.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2023-01-23 12:00:09 UTC
+# Frozen on 2023-02-03 12:33:35 UTC
 # Generated by conda-lock.
 # platform: linux-aarch64
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+# input_hash: 5d827030b8550a7c54b1799a2f8975f8c422c8cd7f555193fcd4912380c6d3cb
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-https://conda.anaconda.org/conda-forge/linux-aarch64/krb5-1.20.1-h113d92e_0.conda#c0ac34c76019d6ebfef2d47a5687459c
 https://conda.anaconda.org/conda-forge/linux-aarch64/nodejs-18.12.1-h928fb59_0.tar.bz2#b0ff8fc996c6e50ac2b3e1a5dcc14d34
 https://conda.anaconda.org/conda-forge/linux-aarch64/sqlite-3.40.0-h69ca7e5_0.tar.bz2#ef70a4737971a336d0dbb8913280e5ce
-https://conda.anaconda.org/conda-forge/linux-aarch64/libcurl-7.87.0-h6ad7c7a_0.conda#6e8310f3e0b523e64faa9012d4151ff0
 https://conda.anaconda.org/conda-forge/linux-aarch64/python-3.7.12-h47f6e27_100_cpython.tar.bz2#d7b2c7500aa702c992c285854bef95a7
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@@ -63,11 +55,10 @@ https://conda.anaconda.org/conda-forge/noarch/pandocfilters-1.5.0-pyhd8ed1ab_0.t
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-https://conda.anaconda.org/conda-forge/noarch/prometheus_client-0.15.0-pyhd8ed1ab_0.tar.bz2#b260ed41427dbbe70537b3030c643b2e
+https://conda.anaconda.org/conda-forge/noarch/prometheus_client-0.16.0-pyhd8ed1ab_0.conda#8efaddc1c8b8ce262c4d1a7c6571c799
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-https://conda.anaconda.org/conda-forge/linux-aarch64/pycurl-7.45.1-py37h9038dd2_2.tar.bz2#e017fb5d3b231c363955854e8421a7b4
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 https://conda.anaconda.org/conda-forge/linux-aarch64/pyrsistent-0.18.1-py37heeccf27_1.tar.bz2#604a4c0f1fa79c503cc56d85b0e4af30
 https://conda.anaconda.org/conda-forge/linux-aarch64/pysocks-1.7.1-py37hd9ded2f_5.tar.bz2#83a3d8c5b531c55e9241adc3d4e23373
@@ -77,24 +68,24 @@ https://conda.anaconda.org/conda-forge/noarch/pytz-2022.7.1-pyhd8ed1ab_0.conda#f
 https://conda.anaconda.org/conda-forge/linux-aarch64/pyzmq-24.0.1-py37h7cb28e0_0.tar.bz2#97e6c8c18201d08a2eb5f87ce28cb55e
 https://conda.anaconda.org/conda-forge/linux-aarch64/ruamel.yaml.clib-0.2.6-py37h795501a_1.tar.bz2#65038418d32470b70045205dd1bd7579
 https://conda.anaconda.org/conda-forge/noarch/send2trash-1.8.0-pyhd8ed1ab_0.tar.bz2#edab14119efe85c3bf131ad747e9005c
-https://conda.anaconda.org/conda-forge/noarch/setuptools-66.1.1-pyhd8ed1ab_0.conda#9467d520d1457018e055bbbfdf9b7567
+https://conda.anaconda.org/conda-forge/noarch/setuptools-67.1.0-pyhd8ed1ab_0.conda#845dae446df791b5e1a3eaa6454640c1
 https://conda.anaconda.org/conda-forge/noarch/six-1.16.0-pyh6c4a22f_0.tar.bz2#e5f25f8dbc060e9a8d912e432202afc2
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-https://conda.anaconda.org/conda-forge/noarch/traitlets-5.8.1-pyhd8ed1ab_0.conda#ef5179bcc6a9acc23b12ac92936e05ab
+https://conda.anaconda.org/conda-forge/noarch/traitlets-5.9.0-pyhd8ed1ab_0.conda#d0b4f5c87cd35ac3fb3d47b223263a64
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-https://conda.anaconda.org/conda-forge/noarch/websocket-client-1.4.2-pyhd8ed1ab_0.tar.bz2#5309fca1777cfdd2d7ab582edb8cc41a
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-https://conda.anaconda.org/conda-forge/noarch/zipp-3.11.0-pyhd8ed1ab_0.conda#09b5b885341697137879a4f039a9e5a1
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-https://conda.anaconda.org/conda-forge/noarch/beautifulsoup4-4.11.1-pyha770c72_0.tar.bz2#eeec8814bd97b2681f708bb127478d7d
-https://conda.anaconda.org/conda-forge/noarch/bleach-5.0.1-pyhd8ed1ab_0.tar.bz2#1f5151d37e4a2b1137f81c89a3a769f2
+https://conda.anaconda.org/conda-forge/noarch/beautifulsoup4-4.11.2-pyha770c72_0.conda#88b59f6989f0ed5ab3433af0b82555e1
+https://conda.anaconda.org/conda-forge/noarch/bleach-6.0.0-pyhd8ed1ab_0.conda#d48b143d01385872a88ef8417e96c30e
 https://conda.anaconda.org/conda-forge/linux-aarch64/cffi-1.15.1-py37h828e148_1.tar.bz2#50a7437124b0618862af25f390dc259f
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 https://conda.anaconda.org/conda-forge/noarch/importlib_resources-5.10.2-pyhd8ed1ab_0.conda#de76905f801c22fc43e624058574eab3
@@ -103,7 +94,7 @@ https://conda.anaconda.org/conda-forge/noarch/jinja2-3.1.2-pyhd8ed1ab_1.tar.bz2#
 https://conda.anaconda.org/conda-forge/linux-aarch64/jupyter_core-4.11.1-py37hfd236b0_0.tar.bz2#7d39f788ccc3fb1cc4f099122cb6a9ca
 https://conda.anaconda.org/conda-forge/noarch/matplotlib-inline-0.1.6-pyhd8ed1ab_0.tar.bz2#b21613793fcc81d944c76c9f2864a7de
 https://conda.anaconda.org/conda-forge/noarch/pexpect-4.8.0-pyh1a96a4e_2.tar.bz2#330448ce4403cc74990ac07c555942a1
-https://conda.anaconda.org/conda-forge/noarch/pip-22.3.1-pyhd8ed1ab_0.tar.bz2#da66f2851b9836d3a7c5190082a45f7d
+https://conda.anaconda.org/conda-forge/noarch/pip-23.0-pyhd8ed1ab_0.conda#85b35999162ec95f9f999bac15279c02
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@@ -130,19 +121,19 @@ https://conda.anaconda.org/conda-forge/linux-aarch64/ipython-7.33.0-py37hd9ded2f
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-https://conda.anaconda.org/conda-forge/noarch/nbconvert-core-7.2.8-pyhd8ed1ab_0.conda#252899fe1f90aeb0c3391ff32a5035f1
+https://conda.anaconda.org/conda-forge/noarch/nbconvert-core-7.2.9-pyhd8ed1ab_0.conda#a9e1826152e79416db71c51b0d3af28c
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 https://conda.anaconda.org/conda-forge/noarch/jupyterlab_server-2.19.0-pyhd8ed1ab_0.conda#9dc0706ec2f8e13b7a0db9d6a19051ff
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-https://conda.anaconda.org/conda-forge/noarch/nbclassic-0.4.8-pyhd8ed1ab_0.tar.bz2#f4f150f83ed90a1b833e6081bbf38257
+https://conda.anaconda.org/conda-forge/noarch/nbclassic-0.5.1-pyhd8ed1ab_0.conda#cf832e3d48ef22528c676ed6e4b4085a
 https://conda.anaconda.org/conda-forge/noarch/notebook-6.4.12-pyha770c72_0.tar.bz2#77fc67c5bbea44fd41e8bbe2ac82d1ad
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-https://conda.anaconda.org/conda-forge/linux-aarch64/jupyterhub-singleuser-1.5.0-py37hd9ded2f_1.tar.bz2#b4835a25344591dd4c538c66736c7b95
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 https://conda.anaconda.org/conda-forge/noarch/nteract_on_jupyter-2.1.3-py_0.tar.bz2#1430ccd983ae6b161e2fbf4377965f7a
+https://conda.anaconda.org/conda-forge/noarch/jupyterhub-singleuser-3.1.1-pyh2a2186d_0.conda#6d0a3394efe9ff7c0ad1ed03a6ca3720
diff --git a/repo2docker/buildpacks/conda/environment.py-3.7.yml b/repo2docker/buildpacks/conda/environment.py-3.7.yml
index a0afd3d70..d20195340 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.7.yml
+++ b/repo2docker/buildpacks/conda/environment.py-3.7.yml
@@ -1,5 +1,5 @@
 # AUTO GENERATED FROM environment.yml, DO NOT MANUALLY MODIFY
-# Generated on 2023-01-23 11:59:03 UTC
+# Generated on 2023-02-03 12:33:27 UTC
 channels:
 - conda-forge
 dependencies:
@@ -10,6 +10,6 @@ dependencies:
 - jupyter-offlinenotebook==0.2.2
 - jupyter-resource-usage==0.7.0
 - jupyterlab==3.4.8
-- jupyterhub-singleuser==1.5.0
+- jupyterhub-singleuser==3.1.1
 - notebook==6.4.12
 - nteract_on_jupyter==2.1.3
diff --git a/repo2docker/buildpacks/conda/environment.py-3.8-linux-64.lock b/repo2docker/buildpacks/conda/environment.py-3.8-linux-64.lock
index 72bc5afb5..c1c0ff49f 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.8-linux-64.lock
+++ b/repo2docker/buildpacks/conda/environment.py-3.8-linux-64.lock
@@ -1,22 +1,19 @@
 # AUTO GENERATED FROM environment.py-3.8.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2023-01-23 12:02:13 UTC
+# Frozen on 2023-02-03 12:32:57 UTC
 # Generated by conda-lock.
 # platform: linux-64
-# input_hash: 3ee9f169b42eac9c4b87b9717811f649e435daf083090ac5504090183c941cce
+# input_hash: 2fe7881a5392503fd6a9f83c6e0faba6d5cc08834c94af8545dde81cf2a35991
 @EXPLICIT
 https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2#d7c89558ba9fa0495403155b64376d81
 https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2022.12.7-ha878542_0.conda#ff9f73d45c4a07d6f424495288a26080
-https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.39-hcc3a1bd_1.conda#737be0d34c22d24432049ab7a3214de4
+https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.40-h41732ed_0.conda#7aca3059a1729aa76c597603f10b0dd3
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 https://conda.anaconda.org/conda-forge/linux-64/icu-70.1-h27087fc_0.tar.bz2#87473a15119779e021c314249d4b4aed
-https://conda.anaconda.org/conda-forge/linux-64/keyutils-1.6.1-h166bdaf_0.tar.bz2#30186d27e2c9fa62b45fb1476b7200e3
-https://conda.anaconda.org/conda-forge/linux-64/libev-4.33-h516909a_1.tar.bz2#6f8720dff19e17ce5d48cfe7f3d2f0a3
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@@ -24,20 +21,16 @@ https://conda.anaconda.org/conda-forge/linux-64/libuuid-2.32.1-h7f98852_1000.tar
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 https://conda.anaconda.org/conda-forge/linux-64/ncurses-6.3-h27087fc_1.tar.bz2#4acfc691e64342b9dae57cf2adc63238
-https://conda.anaconda.org/conda-forge/linux-64/openssl-3.0.7-h0b41bf4_1.conda#7adaac6ff98219bcb99b45e408b80f4e
+https://conda.anaconda.org/conda-forge/linux-64/openssl-3.0.7-h0b41bf4_2.conda#45758f4ece9c8b7b5f99328bd5caae51
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-https://conda.anaconda.org/conda-forge/linux-64/libedit-3.1.20191231-he28a2e2_2.tar.bz2#4d331e44109e3f0e19b4cb8f9b82f3e1
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diff --git a/repo2docker/buildpacks/conda/environment.py-3.8-linux-aarch64.lock b/repo2docker/buildpacks/conda/environment.py-3.8-linux-aarch64.lock
index cbaa1dc10..1a65698b4 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.8-linux-aarch64.lock
+++ b/repo2docker/buildpacks/conda/environment.py-3.8-linux-aarch64.lock
@@ -1,11 +1,11 @@
 # AUTO GENERATED FROM environment.py-3.8.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2023-01-23 12:03:18 UTC
+# Frozen on 2023-02-03 12:33:06 UTC
 # Generated by conda-lock.
 # platform: linux-aarch64
-# input_hash: ee16c54e01819e63190fba74576e2d110a2657abfb395e71346210349b48c082
+# input_hash: 49ac68894a6f3d26b7563dc8c14578743db85f571df2b05b7ed977c7084b8f35
 @EXPLICIT
 https://conda.anaconda.org/conda-forge/linux-aarch64/ca-certificates-2022.12.7-h4fd8a4c_0.conda#2450fbcaf65634e0d071e47e2b8487b4
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+https://conda.anaconda.org/conda-forge/linux-aarch64/ld_impl_linux-aarch64-2.40-h2d8c526_0.conda#16246d69e945d0b1969a6099e7c5d457
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@@ -13,10 +13,7 @@ https://conda.anaconda.org/conda-forge/linux-aarch64/python_abi-3.8-3_cp38.conda
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+https://conda.anaconda.org/conda-forge/linux-aarch64/debugpy-1.6.6-py38h31bd7b8_0.conda#32cbc6059d9bffdfad75f8ace0dbdbe8
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@@ -65,7 +57,7 @@ https://conda.anaconda.org/conda-forge/noarch/pandocfilters-1.5.0-pyhd8ed1ab_0.t
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+https://conda.anaconda.org/conda-forge/noarch/prometheus_client-0.16.0-pyhd8ed1ab_0.conda#8efaddc1c8b8ce262c4d1a7c6571c799
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@@ -79,25 +71,25 @@ https://conda.anaconda.org/conda-forge/noarch/pytz-2022.7.1-pyhd8ed1ab_0.conda#f
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+https://conda.anaconda.org/conda-forge/noarch/jupyterhub-singleuser-3.1.1-pyh2a2186d_0.conda#6d0a3394efe9ff7c0ad1ed03a6ca3720
diff --git a/repo2docker/buildpacks/conda/environment.py-3.8.yml b/repo2docker/buildpacks/conda/environment.py-3.8.yml
index eaf5fc906..48a2a0df0 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.8.yml
+++ b/repo2docker/buildpacks/conda/environment.py-3.8.yml
@@ -1,5 +1,5 @@
 # AUTO GENERATED FROM environment.yml, DO NOT MANUALLY MODIFY
-# Generated on 2023-01-23 12:02:13 UTC
+# Generated on 2023-02-03 12:32:57 UTC
 channels:
 - conda-forge
 dependencies:
@@ -10,6 +10,6 @@ dependencies:
 - jupyter-offlinenotebook==0.2.2
 - jupyter-resource-usage==0.7.0
 - jupyterlab==3.4.8
-- jupyterhub-singleuser==1.5.0
+- jupyterhub-singleuser==3.1.1
 - notebook==6.4.12
 - nteract_on_jupyter==2.1.3
diff --git a/repo2docker/buildpacks/conda/environment.py-3.9-linux-64.lock b/repo2docker/buildpacks/conda/environment.py-3.9-linux-64.lock
index 6fc15bb25..5d7d29c63 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.9-linux-64.lock
+++ b/repo2docker/buildpacks/conda/environment.py-3.9-linux-64.lock
@@ -1,12 +1,12 @@
 # AUTO GENERATED FROM environment.py-3.9.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2023-01-23 12:05:17 UTC
+# Frozen on 2023-02-03 12:34:00 UTC
 # Generated by conda-lock.
 # platform: linux-64
-# input_hash: 3e8d6c21102d42dc26862fa21fbba8f868f97a08b274d8fb41d88a36b73e8c77
+# input_hash: 579c1dd71f26268bb3c6470a6fbedf23ee639f53ae70be703248160e72e6ccdf
 @EXPLICIT
 https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2#d7c89558ba9fa0495403155b64376d81
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-https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.39-hcc3a1bd_1.conda#737be0d34c22d24432049ab7a3214de4
+https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.40-h41732ed_0.conda#7aca3059a1729aa76c597603f10b0dd3
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@@ -14,10 +14,7 @@ https://conda.anaconda.org/conda-forge/linux-64/libgomp-12.2.0-h65d4601_19.tar.b
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-https://conda.anaconda.org/conda-forge/linux-64/keyutils-1.6.1-h166bdaf_0.tar.bz2#30186d27e2c9fa62b45fb1476b7200e3
-https://conda.anaconda.org/conda-forge/linux-64/libev-4.33-h516909a_1.tar.bz2#6f8720dff19e17ce5d48cfe7f3d2f0a3
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@@ -25,20 +22,16 @@ https://conda.anaconda.org/conda-forge/linux-64/libuuid-2.32.1-h7f98852_1000.tar
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 https://conda.anaconda.org/conda-forge/linux-64/ncurses-6.3-h27087fc_1.tar.bz2#4acfc691e64342b9dae57cf2adc63238
-https://conda.anaconda.org/conda-forge/linux-64/openssl-3.0.7-h0b41bf4_1.conda#7adaac6ff98219bcb99b45e408b80f4e
+https://conda.anaconda.org/conda-forge/linux-64/openssl-3.0.7-h0b41bf4_2.conda#45758f4ece9c8b7b5f99328bd5caae51
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-https://conda.anaconda.org/conda-forge/linux-64/libedit-3.1.20191231-he28a2e2_2.tar.bz2#4d331e44109e3f0e19b4cb8f9b82f3e1
-https://conda.anaconda.org/conda-forge/linux-64/libnghttp2-1.51.0-hff17c54_0.conda#dd682f0b6d65e75b2bc868fc8e93d87e
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-https://conda.anaconda.org/conda-forge/linux-64/krb5-1.20.1-h81ceb04_0.conda#89a41adce7106749573d883b2f657d78
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-https://conda.anaconda.org/conda-forge/linux-64/python-3.9.15-hba424b6_0_cpython.conda#7b9485fce17fac2dd4aca6117a9936c2
+https://conda.anaconda.org/conda-forge/linux-64/python-3.9.16-h2782a2a_0_cpython.conda#95c9b7c96a7fd7342e0c9d0a917b8f78
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@@ -46,18 +39,17 @@ https://conda.anaconda.org/conda-forge/noarch/backports-1.0-pyhd8ed1ab_3.conda#5
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-https://conda.anaconda.org/conda-forge/linux-64/debugpy-1.6.5-py39h227be39_0.conda#d45eb68cec77b0baaa689273604ad457
+https://conda.anaconda.org/conda-forge/linux-64/debugpy-1.6.6-py39h227be39_0.conda#bfd2d6f572201394387edcadc4a08888
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diff --git a/repo2docker/buildpacks/conda/environment.py-3.9-linux-aarch64.lock b/repo2docker/buildpacks/conda/environment.py-3.9-linux-aarch64.lock
index e85cb05bd..451fc4321 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.9-linux-aarch64.lock
+++ b/repo2docker/buildpacks/conda/environment.py-3.9-linux-aarch64.lock
@@ -1,11 +1,11 @@
 # AUTO GENERATED FROM environment.py-3.9.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2023-01-23 12:06:23 UTC
+# Frozen on 2023-02-03 12:34:07 UTC
 # Generated by conda-lock.
 # platform: linux-aarch64
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+# input_hash: 5d969695d1fb1e159afd55142ca58e173ba124b10a7223b9f8686786800aef5e
 @EXPLICIT
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+https://conda.anaconda.org/conda-forge/linux-aarch64/jupyter_core-5.2.0-py39h4420490_0.conda#0febdd95c4b1080857f066ff497ba3c1
 https://conda.anaconda.org/conda-forge/noarch/jupyter_telemetry-0.1.0-pyhd8ed1ab_1.tar.bz2#bb9ebdb6d5aa2622484aff1faceee181
 https://conda.anaconda.org/conda-forge/noarch/oauthlib-3.2.2-pyhd8ed1ab_0.tar.bz2#8f882b197fd9c4941a787926baea4868
 https://conda.anaconda.org/conda-forge/noarch/prompt-toolkit-3.0.36-pyha770c72_0.conda#4d79ec192e0bfd530a254006d123b9a6
 https://conda.anaconda.org/conda-forge/noarch/pyopenssl-23.0.0-pyhd8ed1ab_0.conda#d41957700e83bbb925928764cb7f8878
 https://conda.anaconda.org/conda-forge/noarch/certipy-0.1.3-py_0.tar.bz2#23486713ef5712923e7c57cae609b22e
-https://conda.anaconda.org/conda-forge/noarch/ipython-8.8.0-pyh41d4057_0.conda#788c234d910ad9f37174d1845c1a52c7
-https://conda.anaconda.org/conda-forge/noarch/jupyter_client-7.4.9-pyhd8ed1ab_0.conda#5cbf9a31a19d4ef9103adb7d71fd45fd
+https://conda.anaconda.org/conda-forge/noarch/ipython-8.9.0-pyh41d4057_0.conda#399217b9b00e59e990585576eeca3dde
+https://conda.anaconda.org/conda-forge/noarch/jupyter_client-8.0.2-pyhd8ed1ab_0.conda#cbb8d182b6053ce14b5fe60ef1e36fbb
 https://conda.anaconda.org/conda-forge/noarch/nbformat-5.7.3-pyhd8ed1ab_0.conda#9714111cb6c7dbbc9a9f34de205c2f29
 https://conda.anaconda.org/conda-forge/noarch/urllib3-1.26.14-pyhd8ed1ab_0.conda#01f33ad2e0aaf6b5ba4add50dad5ad29
-https://conda.anaconda.org/conda-forge/noarch/ipykernel-6.20.2-pyh210e3f2_0.conda#41b586f0826282574ab35a0087019bb6
+https://conda.anaconda.org/conda-forge/noarch/ipykernel-6.21.1-pyh210e3f2_0.conda#225e7869419b8bcae5d3165eba50204d
 https://conda.anaconda.org/conda-forge/noarch/nbclient-0.7.2-pyhd8ed1ab_0.conda#6c7b0d75b66a220274bb5a28c23197f2
 https://conda.anaconda.org/conda-forge/noarch/requests-2.28.2-pyhd8ed1ab_0.conda#11d178fc55199482ee48d6812ea83983
 https://conda.anaconda.org/conda-forge/noarch/ipywidgets-8.0.2-pyhd8ed1ab_1.tar.bz2#81b7f46918555bf911ad2ba2f3259094
-https://conda.anaconda.org/conda-forge/linux-aarch64/jupyterhub-base-1.5.0-py39ha65689a_1.tar.bz2#4a9725abb86dbd756dc201db57022055
-https://conda.anaconda.org/conda-forge/noarch/nbconvert-core-7.2.8-pyhd8ed1ab_0.conda#252899fe1f90aeb0c3391ff32a5035f1
+https://conda.anaconda.org/conda-forge/noarch/jupyterhub-base-3.1.1-pyh2a2186d_0.conda#78fc5dfd4577a7ba172fa65eb64b6afb
+https://conda.anaconda.org/conda-forge/noarch/nbconvert-core-7.2.9-pyhd8ed1ab_0.conda#a9e1826152e79416db71c51b0d3af28c
 https://conda.anaconda.org/conda-forge/noarch/jupyter_server-1.23.5-pyhd8ed1ab_0.conda#e3ae1d46749f48a1875b560fca41cb0c
-https://conda.anaconda.org/conda-forge/noarch/nbconvert-pandoc-7.2.8-pyhd8ed1ab_0.conda#701b0db88fe192e1685de29b8ca0840e
+https://conda.anaconda.org/conda-forge/noarch/nbconvert-pandoc-7.2.9-pyhd8ed1ab_0.conda#4a8dc94c7c2f3736dc4b91ec345d5b4b
 https://conda.anaconda.org/conda-forge/noarch/jupyter-resource-usage-0.7.0-pyhd8ed1ab_0.conda#c57567d49d926826b1f852712ac8acfa
 https://conda.anaconda.org/conda-forge/noarch/jupyterlab_server-2.19.0-pyhd8ed1ab_0.conda#9dc0706ec2f8e13b7a0db9d6a19051ff
-https://conda.anaconda.org/conda-forge/noarch/nbconvert-7.2.8-pyhd8ed1ab_0.conda#8b5cb7073f66beef0d7161406fdb6e8b
+https://conda.anaconda.org/conda-forge/noarch/nbconvert-7.2.9-pyhd8ed1ab_0.conda#523aaa3affb003ab0e68dbc24c9027f4
 https://conda.anaconda.org/conda-forge/noarch/notebook-shim-0.2.2-pyhd8ed1ab_0.tar.bz2#40be846cd4e78672a40e43db9dae753c
-https://conda.anaconda.org/conda-forge/noarch/nbclassic-0.4.8-pyhd8ed1ab_0.tar.bz2#f4f150f83ed90a1b833e6081bbf38257
+https://conda.anaconda.org/conda-forge/noarch/nbclassic-0.5.1-pyhd8ed1ab_0.conda#cf832e3d48ef22528c676ed6e4b4085a
 https://conda.anaconda.org/conda-forge/noarch/notebook-6.4.12-pyha770c72_0.tar.bz2#77fc67c5bbea44fd41e8bbe2ac82d1ad
 https://conda.anaconda.org/conda-forge/noarch/jupyter-offlinenotebook-0.2.2-pyh1d7be83_0.tar.bz2#fe55056ce4bc4bd4953ba440270735fb
-https://conda.anaconda.org/conda-forge/linux-aarch64/jupyterhub-singleuser-1.5.0-py39ha65689a_1.tar.bz2#428f24f44794a428a875ee08be6eee31
 https://conda.anaconda.org/conda-forge/noarch/jupyterlab-3.4.8-pyhd8ed1ab_0.tar.bz2#6fbf13b0e8a6fa24bbae91205e8ce467
 https://conda.anaconda.org/conda-forge/noarch/nteract_on_jupyter-2.1.3-py_0.tar.bz2#1430ccd983ae6b161e2fbf4377965f7a
+https://conda.anaconda.org/conda-forge/noarch/jupyterhub-singleuser-3.1.1-pyh2a2186d_0.conda#6d0a3394efe9ff7c0ad1ed03a6ca3720
diff --git a/repo2docker/buildpacks/conda/environment.py-3.9.yml b/repo2docker/buildpacks/conda/environment.py-3.9.yml
index 14f7f0cb4..852d7eba5 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.9.yml
+++ b/repo2docker/buildpacks/conda/environment.py-3.9.yml
@@ -1,5 +1,5 @@
 # AUTO GENERATED FROM environment.yml, DO NOT MANUALLY MODIFY
-# Generated on 2023-01-23 12:05:17 UTC
+# Generated on 2023-02-03 12:34:00 UTC
 channels:
 - conda-forge
 dependencies:
@@ -10,6 +10,6 @@ dependencies:
 - jupyter-offlinenotebook==0.2.2
 - jupyter-resource-usage==0.7.0
 - jupyterlab==3.4.8
-- jupyterhub-singleuser==1.5.0
+- jupyterhub-singleuser==3.1.1
 - notebook==6.4.12
 - nteract_on_jupyter==2.1.3
diff --git a/repo2docker/buildpacks/conda/environment.yml b/repo2docker/buildpacks/conda/environment.yml
index 3245f58c0..c34a43d83 100644
--- a/repo2docker/buildpacks/conda/environment.yml
+++ b/repo2docker/buildpacks/conda/environment.yml
@@ -8,6 +8,6 @@ dependencies:
   - jupyter-offlinenotebook==0.2.2
   - jupyter-resource-usage==0.7.0
   - jupyterlab==3.4.8
-  - jupyterhub-singleuser==1.5.0
+  - jupyterhub-singleuser==3.1.1
   - notebook==6.4.12
   - nteract_on_jupyter==2.1.3
diff --git a/repo2docker/buildpacks/conda/freeze.py b/repo2docker/buildpacks/conda/freeze.py
index e800b714e..b464fcc21 100755
--- a/repo2docker/buildpacks/conda/freeze.py
+++ b/repo2docker/buildpacks/conda/freeze.py
@@ -117,7 +117,7 @@ def set_python(py_env_file, py):
         "py",
         nargs="*",
         help="Python version(s) to update and freeze",
-        default=("3.7", "3.8", "3.9", "3.10"),
+        default=("3.7", "3.8", "3.9", "3.10", "3.11"),
     )
     parser.add_argument(
         "platform",
diff --git a/repo2docker/buildpacks/conda/requirements.py-3.5.pip b/repo2docker/buildpacks/conda/requirements.py-3.5.pip
deleted file mode 100644
index 416274ad2..000000000
--- a/repo2docker/buildpacks/conda/requirements.py-3.5.pip
+++ /dev/null
@@ -1,17 +0,0 @@
-# pip-installed packages for Python 3.5
-# these should only be packages
-# whose versions are too new to have builds available for Python 3.5
-alembic==1.0.3
-async-generator==1.10
-chardet==3.0.4
-idna==2.7
-jupyterhub==0.9.4
-mako==1.0.7
-notebook==5.7.8
-nteract-on-jupyter==1.9.6
-pamela==0.3.0
-python-editor==1.0.3
-python-oauth2==1.1.0
-requests==2.20.1
-sqlalchemy==1.2.14
-urllib3==1.24.1
diff --git a/repo2docker/buildpacks/julia/julia_require.py b/repo2docker/buildpacks/julia/julia_require.py
index b3b8cecf2..ad3f5448d 100644
--- a/repo2docker/buildpacks/julia/julia_require.py
+++ b/repo2docker/buildpacks/julia/julia_require.py
@@ -82,6 +82,14 @@ def get_build_env(self):
         else:
             julia_arch = "x86_64"
             julia_arch_short = "x64"
+
+        if V(self.julia_version) < V("0.7"):
+            # IJulia with Julia 0.6 isn't compatible with more recent jupyter-core
+            # point it to the one in the kernel env
+            # I _think_ this is only relevant during installation
+            jupyter = "${KERNEL_PYTHON_PREFIX}/bin/jupyter"
+        else:
+            jupyter = "${NB_PYTHON_PREFIX}/bin/jupyter"
         return super().get_build_env() + [
             ("JULIA_PATH", "${APP_BASE}/julia"),
             ("JULIA_HOME", "${JULIA_PATH}/bin"),  # julia <= 0.6
@@ -91,7 +99,7 @@ def get_build_env(self):
             ("JULIA_VERSION", self.julia_version),
             ("JULIA_ARCH", julia_arch),
             ("JULIA_ARCH_SHORT", julia_arch_short),
-            ("JUPYTER", "${NB_PYTHON_PREFIX}/bin/jupyter"),
+            ("JUPYTER", jupyter),
         ]
 
     def get_path(self):
diff --git a/repo2docker/buildpacks/pipfile/__init__.py b/repo2docker/buildpacks/pipfile/__init__.py
index f08a1beba..7f8ec53b6 100644
--- a/repo2docker/buildpacks/pipfile/__init__.py
+++ b/repo2docker/buildpacks/pipfile/__init__.py
@@ -113,8 +113,8 @@ def get_assemble_scripts(self):
         # environment.
         assemble_scripts = super().get_assemble_scripts()
 
-        if self.py2:
-            # using Python 2 as a kernel, but Python 3 for the notebook server
+        if self.separate_kernel_env:
+            # using legacy Python (e.g. 2.7) as a kernel
 
             # requirements3.txt allows for packages to be installed to the
             # notebook servers Python environment
diff --git a/repo2docker/buildpacks/python/__init__.py b/repo2docker/buildpacks/python/__init__.py
index 7aa225642..a96a6cabf 100644
--- a/repo2docker/buildpacks/python/__init__.py
+++ b/repo2docker/buildpacks/python/__init__.py
@@ -45,8 +45,8 @@ def _get_pip_scripts(self):
         # whether it's distinct from the notebook or the same.
         pip = "${KERNEL_PYTHON_PREFIX}/bin/pip"
         scripts = []
-        if self.py2:
-            # using python 2 kernel,
+        if self.separate_kernel_env:
+            # using legacy Python kernel
             # requirements3.txt allows installation in the notebook server env
             nb_requirements_file = self.binder_path("requirements3.txt")
             if os.path.exists(nb_requirements_file):


Test patch:
diff --git a/tests/conda/py35-binder-dir/verify b/tests/conda/py35-binder-dir/verify
index 8bad344de..dc2d9a60d 100755
--- a/tests/conda/py35-binder-dir/verify
+++ b/tests/conda/py35-binder-dir/verify
@@ -1,17 +1,28 @@
 #!/usr/bin/env python
+import os
 import sys
-from subprocess import check_output
+from subprocess import STDOUT, check_output
 
-assert sys.version_info[:2] == (3, 5), sys.version
+assert sys.version_info[:2] == (3, 7), sys.version
 
-out = check_output(["micromamba", "--version"]).decode("utf8").strip()
+
+def sh(cmd, **kwargs):
+    return check_output(cmd, **kwargs).decode("utf8").strip()
+
+
+kernel_python = os.path.join(os.environ["KERNEL_PYTHON_PREFIX"], "bin", "python")
+out = sh([kernel_python, "--version"], stderr=STDOUT)
+v = out.split()[1]
+assert v[:3] == "3.5", out
+
+out = sh(["micromamba", "--version"])
 assert out == "1.1.0", out
 
-out = check_output(["mamba", "--version"]).decode("utf8").strip()
+out = sh(["mamba", "--version"])
 assert (
     out
     == """mamba 1.1.0
 conda 4.13.0"""
 ), out
 
-import numpy
+sh([kernel_python, "-c", "import numpy"])
diff --git a/tests/conda/py36-postBuild/environment.yml b/tests/conda/py36-postBuild/environment.yml
new file mode 100644
index 000000000..c6ce14436
--- /dev/null
+++ b/tests/conda/py36-postBuild/environment.yml
@@ -0,0 +1,3 @@
+dependencies:
+  - python=3.6
+  - numpy
diff --git a/tests/conda/py36-postBuild/postBuild b/tests/conda/py36-postBuild/postBuild
new file mode 100755
index 000000000..cf0db0125
--- /dev/null
+++ b/tests/conda/py36-postBuild/postBuild
@@ -0,0 +1,9 @@
+#!/bin/bash
+set -ex
+
+# mamba/conda installs in kernel env
+mamba install -y make
+
+# note `pip` on path is _not_ the kernel env!
+# is this what we (or users) want?
+pip install pytest
diff --git a/tests/conda/py36-postBuild/verify b/tests/conda/py36-postBuild/verify
new file mode 100755
index 000000000..e576d7ab5
--- /dev/null
+++ b/tests/conda/py36-postBuild/verify
@@ -0,0 +1,3 @@
+#!/bin/bash
+set -ex
+pytest -vs ./verify.py
diff --git a/tests/conda/py36-postBuild/verify.py b/tests/conda/py36-postBuild/verify.py
new file mode 100644
index 000000000..806a5c9a5
--- /dev/null
+++ b/tests/conda/py36-postBuild/verify.py
@@ -0,0 +1,85 @@
+"""
+tests to be run with pytest inside the container
+
+can't be called test_whatever.py because then _host_ pytest will try to run it!
+"""
+
+import json
+import os
+import shutil
+from subprocess import check_output
+
+from pytest import fixture
+
+kernel_prefix = os.environ.get("KERNEL_PYTHON_PREFIX")
+server_prefix = os.environ.get("NB_PYTHON_PREFIX")
+
+
+def json_cmd(cmd):
+    """Run a command and decode its JSON output"""
+    out = check_output(cmd)
+    return json.loads(out.decode("utf8", "replace"))
+
+
+def conda_pkgs(prefix):
+    """Conda package list as a dict"""
+    conda_json = json_cmd(["conda", "list", "--json", "-p", prefix])
+    return {pkg["name"]: pkg for pkg in conda_json}
+
+
+def pip_pkgs(prefix):
+    """Pip package list as a dict"""
+    pip_json = json_cmd([f"{prefix}/bin/pip", "list", "--format=json"])
+    return {pkg["name"]: pkg for pkg in pip_json}
+
+
+@fixture(scope="session")
+def kernel_conda():
+    return conda_pkgs(kernel_prefix)
+
+
+@fixture(scope="session")
+def server_conda():
+    return conda_pkgs(server_prefix)
+
+
+@fixture(scope="session")
+def kernel_pip():
+    return pip_pkgs(kernel_prefix)
+
+
+@fixture(scope="session")
+def server_pip():
+    return pip_pkgs(server_prefix)
+
+
+def test_which_python():
+    # server python comes first. Is this expected?
+    assert shutil.which("python3") == f"{server_prefix}/bin/python3"
+
+
+def test_kernel_env(kernel_conda):
+    assert kernel_prefix != server_prefix
+    kernel_python = kernel_conda["python"]["version"]
+    assert kernel_python[:3] == "3.6"
+    # test environment.yml packages
+    assert "numpy" in kernel_conda
+
+
+def test_server_env(server_conda):
+    # this should be the default version
+    # it will need updating when the default changes
+    assert server_conda["python"]["version"][:3] == "3.7"
+
+
+def test_conda_install(kernel_conda, server_conda):
+    # test that postBuild conda install went in the kernel env
+    assert "make" in kernel_conda
+    assert "make" not in server_conda
+
+
+def test_pip_install(kernel_pip, server_pip):
+    # server env comes first for pip
+    # is this expected?
+    assert "pytest" not in kernel_pip
+    assert "pytest" in server_pip
diff --git a/tests/external/reproductions.repos.yaml b/tests/external/reproductions.repos.yaml
index 74f1085c4..6f9c3459f 100644
--- a/tests/external/reproductions.repos.yaml
+++ b/tests/external/reproductions.repos.yaml
@@ -33,7 +33,7 @@
 # Zenodo record of https://github.com/binder-examples/requirements
 - name: 10.5281/zenodo.3242074
   url: 10.5281/zenodo.3242074
-  verify: python -c 'import matplotlib'
+  verify: /srv/conda/envs/kernel/bin/python -c 'import matplotlib'
 # Test that files in git-lfs are properly cloned
 - name: LFS
   url: https://github.com/binderhub-ci-repos/lfs
diff --git a/tests/pipfile/py36/verify b/tests/pipfile/py36/verify
index f71a6daa8..f54d226ad 100755
--- a/tests/pipfile/py36/verify
+++ b/tests/pipfile/py36/verify
@@ -1,8 +1,8 @@
-#!/usr/bin/env python
+#!/srv/conda/envs/kernel/bin/python
 import sys
 
-import pypi_pkg_test
-import there
-
 print(sys.version_info)
 assert sys.version_info[:2] == (3, 6)
+
+import pypi_pkg_test  # noqa
+import there  # noqa
diff --git a/tests/venv/py35/verify b/tests/venv/py35/verify
index 4abec3090..6475d4f3c 100755
--- a/tests/venv/py35/verify
+++ b/tests/venv/py35/verify
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/srv/conda/envs/kernel/bin/python
 import sys
 
 print(sys.version_info)