Update Dockerfile (ALPINE_VERSION=3.12.0 & install mercurial) + remove mercurial from install_requires

Dockerfile

@@ -1,7 +1,7 @@
-ARG ALPINE_VERSION=3.9.4
+ARG ALPINE_VERSION=3.12.0
 FROM alpine:${ALPINE_VERSION}
 
-RUN apk add --no-cache git python3 python3-dev
+RUN apk add --no-cache git python3 python3-dev py-pip
 
 # build wheels in first image
 ADD . /tmp/src
@@ -15,8 +15,12 @@ RUN mkdir /tmp/wheelhouse \
 
 FROM alpine:${ALPINE_VERSION}
 
-# install python, git, bash
-RUN apk add --no-cache git git-lfs python3 bash docker
+# install python, git, bash, mercurial
+RUN apk add --no-cache git git-lfs python3 py-pip bash docker mercurial
+
+# install and activate the evolve and topic Mercurial extensions
+RUN pip3 install hg-evolve --user --no-cache-dir
+RUN mkdir -p /etc/mercurial/hgrc.d && echo -e "[extensions]\nevolve =\ntopic =\n" >  /etc/mercurial/hgrc.d/evolve.rc
 
 # install repo2docker
 COPY --from=0 /tmp/wheelhouse /tmp/wheelhouse

repo2docker/contentproviders/mercurial.py

@@ -4,16 +4,6 @@ from .base import ContentProvider, ContentProviderException
 from ..utils import execute_cmd
 
 
-hg_config = [
-    "--config",
-    "extensions.hggit=!",
-    "--config",
-    "extensions.evolve=",
-    "--config",
-    "extensions.topic=",
-]
-
-
 class Mercurial(ContentProvider):
     """Provide contents of a remote Mercurial repository."""
 
@@ -22,7 +12,8 @@ class Mercurial(ContentProvider):
             return None
         try:
             subprocess.check_output(
-                ["hg", "identify", source] + hg_config, stderr=subprocess.DEVNULL,
+                ["hg", "identify", source, "--config", "extensions.hggit=!"],
+                stderr=subprocess.DEVNULL,
             )
         except subprocess.CalledProcessError:
             return None
@@ -36,7 +27,6 @@ class Mercurial(ContentProvider):
         # make a clone of the remote repository
         try:
             cmd = ["hg", "clone", repo, output_dir]
-            cmd.extend(hg_config)
             if ref is not None:
                 # don't update so the clone will include an empty working
                 # directory, the given ref will be updated out later
@@ -55,7 +45,7 @@ class Mercurial(ContentProvider):
         if ref is not None:
             try:
                 for line in execute_cmd(
-                    ["hg", "update", "--clean", ref] + hg_config,
+                    ["hg", "update", "--clean", ref],
                     cwd=output_dir,
                     capture=yield_output,
                 ):
@@ -67,7 +57,6 @@ class Mercurial(ContentProvider):
                 raise ValueError("Failed to update to ref {}".format(ref))
 
         cmd = ["hg", "identify", "-i"]
-        cmd.extend(hg_config)
         sha1 = subprocess.Popen(cmd, stdout=subprocess.PIPE, cwd=output_dir)
         self._node_id = sha1.stdout.read().decode().strip()
 

setup.py

@@ -55,8 +55,6 @@ setup(
         "ruamel.yaml>=0.15",
         "toml",
         "semver",
-        "mercurial>=5.2",
-        "hg-evolve>=10.0",
     ],
     python_requires=">=3.6",
     author="Project Jupyter Contributors",