57 lines
1.9 KiB
Bash
Executable file
57 lines
1.9 KiB
Bash
Executable file
#!/usr/bin/env bash
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set -euo pipefail
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# Read the arguments input into an array, so it can be added to a command line.
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IFS=" " read -r -a arguments <<<"${INPUT_ARGUMENTS:-}"
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with_nix_develop() {
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nix develop --ignore-environment "${arguments[@]}" --command "$@"
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}
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contains() {
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grep "$1" --silent <<<"$2"
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}
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# Add all environment variables except for PATH to GITHUB_ENV.
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while IFS='=' read -r -d '' n v; do
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if [ "$n" == "PATH" ]; then
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continue
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fi
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# Skip if the variable is already in the environment with the same
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# value (treating unset and the empty string as identical states)
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if [ "${!n:-}" == "$v" ]; then
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continue
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fi
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if (("$(wc -l <<<"$v")" > 1)); then
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delimiter=$(openssl rand -base64 18)
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if contains "$delimiter" "$v"; then
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echo "Environment variable $n contains randomly generated string $delimiter, file an issue and buy a lottery ticket."
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exit 1
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fi
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printf "%s<<%s\n%s%s\n" "$n" "$delimiter" "$v" "$delimiter" >>"${GITHUB_ENV:-/dev/stderr}"
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continue
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fi
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printf "%s=%s\n" "$n" "$v" >>"${GITHUB_ENV:-/dev/stderr}"
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done < <(with_nix_develop env -0)
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# Read the nix environment's $PATH into an array
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IFS=":" read -r -a nix_path_array <<<"$(with_nix_develop bash -c "echo \$PATH")"
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# Iterate over the PATH array in reverse
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#
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# Why in reverse? Appending a directory to $GITHUB_PATH causes that directory
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# to be _prepended_ to $PATH in subsequent steps, so if we append in
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# first-to-last order, the result will be in last-to-first order. Order in
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# PATH elements is significant, since it determines lookup order, thus we
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# preserve their order by reversing them before they are reversed again.
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for ((i = ${#nix_path_array[@]} - 1; i >= 0; i--)); do
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nix_path_entry="${nix_path_array[$i]}"
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if contains "$nix_path_entry" "$PATH"; then
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continue
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fi
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if ! [ -d "$nix_path_entry" ]; then
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continue
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fi
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echo "$nix_path_entry" >>"${GITHUB_PATH:-/dev/stderr}"
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done
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