Added bootstrap script for the graphviewer environment

.gitignore

@@ -196,3 +196,5 @@ gradle-app.setting
 attic
 .vscode/launch.json
 .vscode/settings.json
+run-server.sh
+mamba

bootstrap-graphviewer.sh

@@ -0,0 +1,70 @@
+#!/bin/bash
+
+### The following environment variables can be used to adjust processing
+
+# 1. We're downloading and installing micromamba here, if required:
+MAMBA_ROOT_PREFIX=${MAMBA_ROOT_PREFIX:-"$PWD/mamba"}
+
+# 2. The path to the productive python environment:
+PRODUCTION_ENV=${PRODUCTION_ENV:-"$PWD/venv"}
+
+#   if present, use this file to initialize the production environment:
+ENVIRONMENT_FILE=${ENVIRONMENT_FILE:-"environment.yml"}
+
+#   otherwise, just install python in the given version:
+PYTHON_VERSION=${PYTHON_VERSION:-3.10}
+
+# 3. finally, run pip with the following argument to install the project:
+PIP_SPEC="${PIP_SPEC:-.[production]}"
+###
+
+export MAMBA_ROOT_PREFIX PRODUCTION_ENV
+micromamba="$MAMBA_ROOT_PREFIX/bin/micromamba"
+
+echob () {
+  tput bold
+  echo "$@"
+  tput sgr0
+}
+
+if [[ -x "$micromamba" ]]; then
+  echob "Micromamba environment present at $MAMBA_ROOT_PREFIX"
+else
+  echob "Downloading micromamba to $MAMBA_ROOT_PREFIX ..."
+  mkdir "$MAMBA_ROOT_PREFIX" && wget -qO- https://micro.mamba.pm/api/micromamba/linux-64/latest | tar -C "$MAMBA_ROOT_PREFIX" -xj bin/micromamba
+fi
+
+if [[ -r ${ENVIRONMENT_FILE} ]]
+then
+  echob "Found environment.yml, installing its contents to $PRODUCTION_ENV"
+  $micromamba create --no-rc --yes -p "$PRODUCTION_ENV" -f "${ENVIRONMENT_FILE}"
+elif [[ -x "${PRODUCTION_ENV}/bin/python${PYTHON_VERSION}" ]]
+then
+  echob "Python $PYTHON_VERSION is already installed in $PRODUCTION_ENV"
+else
+  echob "Using micromamba to install Python $PYTHON_VERSION to $PRODUCTION_ENV ..."
+  $micromamba create --no-rc --yes -p "$PRODUCTION_ENV" python=3.10 wheel -c conda-forge
+fi
+
+if [[ -n "$PIP_SPEC" ]]
+then
+  echob "Using pip to install the project ($PIP_SPEC) ..."
+  $micromamba --no-rc -p "$PRODUCTION_ENV" run pip install "$PIP_SPEC"
+fi
+
+if [[ ! -r run-server ]]
+then
+  cat > run-server.sh <<EOF
+#!/bin/sh
+cd "$PWD"
+if test -r .env
+then
+    . ./.env
+fi
+exec $PRODUCTION_ENV/bin/gunicorn
+EOF
+  chmod 755 ./run-server.sh
+  echob "You may now want to create an .env file to configure stuff"
+  echob "and run $PWD/run-server.sh to start the server."
+fi
+