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Use git-select, frighteningly, from curl; rewrite sparse checkout installation to be limited to the subshell.
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‎README.md‎

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@@ -42,21 +42,18 @@ cd fe
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python3 ./setup.py install
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```
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From [GitHub](https://github.com) using a sparse checkout:
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From [GitHub](https://github.com) using a temporary installation scoped to a subshell:
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```bash
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TARGET="$(pwd)/py-packages"
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export PYTHONPATH="$PYTHONPATH:$TARGET"
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(set -e
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BRANCH=v1.3
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git clone --origin=pypg-frontend --branch=$BRANCH \
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--sparse --filter=blob:none --no-checkout --depth=1 \
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https://github.com/python-postgres/fe.git "$TARGET"
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cd "$TARGET"
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git sparse-checkout set --no-cone postgresql
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git switch $BRANCH
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)
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unset TARGET
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(PYTMPPKG="$(mktemp -d)"
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export PYTHONPATH="$PYTHONPATH:$PYTMPPKG"
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curl -s https://raw.githubusercontent.com/jwp/git-select/main/git-select.py | \
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python3 /dev/stdin \
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https://github.com/python-postgres/fe master "postgresql/./$PYTMPPKG/"
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python3 -c "import postgresql.project as pj; print(); print('py-postgresql:', pj.version)"
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export pg_console="postgresql.bin.pg_python"
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echo ': python3 -m $pg_console'
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$SHELL)
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```
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### Basic Usage

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