add nix-portable --version

[milahu]

nix-portable --version would be useful for installer scripts

nix-portable-install.sh

#!/usr/bin/env bash

# install or update nix-portable
# https://github.com/DavHau/nix-portable

nix_portable_path="$HOME/bin/nix-portable"

bin_dir="$HOME/bin"

if [ -e "$nix_portable_path" ]; then
  if false; then
    # TODO implement
    version_a=$("$nix_portable_path" --version)
  else
    # workaround for "nix-portable --version"
    declare -A version_of_sha256
    # curl -sL https://github.com/DavHau/nix-portable/releases/download/v012/nix-portable-x86_64 | sha256sum -
    version_of_sha256[b409c55904c909ac3aeda3fb1253319f86a89ddd1ba31a5dec33d4a06414c72a]=v012
    # for v in {11..1}; do v0=$(printf %03d $v); echo $(curl -sL https://github.com/DavHau/nix-portable/releases/download/v$v0/nix-portable | sha256sum - | head -c64) v$v0; done
    version_of_sha256[b3f0c14a5756dd6ed45655aa615a074bc2aa9ff6d14f59c174af925f370d465e]=v011
    version_of_sha256[1249a329e9ef14b8564f92f1321e155baee460d23d4295a86944283b13284487]=v010
    version_of_sha256[e371dc77d8cdb4fefacdd2d8abf9b5ce013bb384a2b37def7b96e8dcb0d77790]=v009
    version_of_sha256[51938dc9a72b8aea08aea85278b90b34d65ad8bdb0e85d9e6fcbff222ca85859]=v008
    version_of_sha256[dd2bf333f906fe7f888ac71ae5bff432e8ba2ed86ef5e2de64792ffca568b07a]=v007
    version_of_sha256[5c105c29b8616d28a8625426e5b49969af4c252ac4338ea30ff1648400a14170]=v006
    version_of_sha256[836df3131f9c0a0d1aeb5b11fd8ef5f0e283c85d6443cf27c737fb31219e49d4]=v005
    version_of_sha256[2c8b37f3e785d1adcd175c966cfdcef2934b50b9d62d3c52f3a38c94ef98d175]=v004
    version_of_sha256[43754dd1be4d4f3e7be47722d87871863673c02c338a8498f7dfcdcbb16438f2]=v003
    version_of_sha256[6de46e2c31d537f1d152a4e5066f91474fa5c392490010397379edc824102e37]=v002
    version_of_sha256[ae3f9fa5ddac83c14eb96303816e8f8ea8c5718faccacd74a3ed1f6a694348d6]=v001
    sha256=$(sha256sum "$nix_portable_path" | head -c64)
    version_a="${version_of_sha256[$sha256]}"
    echo "sha256: $sha256 -> version: $version_a"
  fi
else
  version_a=
  mkdir -p "$(dirname "$nix_portable_path")"
fi

version_b=$(
  curl -s -I https://github.com/DavHau/nix-portable/releases/latest |
  grep -i "^location: " | sed 's|.*releases/tag/||' | tr -d $'\r'
)

if [ "$version_a" = "$version_b" ]; then
  echo "keeping nix-portable $version_a"
  exit
else
  echo "updating nix-portable from $version_a to $version_b"
fi

# append version to filename
nix_portable_version_path="$nix_portable_path.$version_b"

url="https://github.com/DavHau/nix-portable/releases/"
url+="download/$version_b/nix-portable-$(uname -m)"

echo "fetching $url"
echo "writing $nix_portable_version_path"

curl -L "$url" >"$nix_portable_version_path"

chmod +x "$nix_portable_version_path"

ln -s -f "$nix_portable_version_path" "$nix_portable_path"

for n in nix nix-shell nix-build; do
  ln -s -f -r "$nix_portable_version_path" "$bin_dir/$n"
done

currently this fails with

$ nix-portable --version
bwrap: execvp /home/user/.nix-portable/nix/store/j823gnvpxh1fjibycmldrspkk3pgivwp-nix-2.20.6/bin/--version: No such file or directory

draft

if [ $# != 0 ] && [ "${0##*/}" = "nix-portable" ] && [ "$1" = "--version" ]; then
  echo v012
  exit
fi