nix-bundle.sh

#!/usr/bin/env sh

if [ "$#" -lt 2 ]; then
    cat <<EOF

Usage: $0 TARGET EXECUTABLE

Create a single-file bundle from the nixpkgs attribute "TARGET".
EXECUTABLE should be relative to the TARGET's output path.

The TARGET is either an attribute in nixpkgs, or an absolute path to the
store.

For example:

$ $0 hello /bin/hello
$ ./hello
Hello, world!

EOF

    exit 1
fi

nix_file=$(dirname "$0")/default.nix

target="$1"
shift

extraTargets=
if [ "$#" -gt 1 ]; then
    while [ "$#" -gt 1 ]; do
        extraTargets="$extraTargets $1"
        shift
    done
fi

exec="$1"
shift

bootstrap=nix-bootstrap
if [ "$target" = "nix-bundle" ] || [ "$target" = "nixStable" ] || [ "$target" = "nixUnstable" ] || [ "$target" = "nix" ]; then
    bootstrap=nix-bootstrap-nix
elif [ -n "$extraTargets" ]; then
    bootstrap=nix-bootstrap-path
fi

expr="with import <nixpkgs> {}; with import $nix_file {}; $bootstrap { target = $target; extraTargets = [ $extraTargets ]; run = \"$exec\"; }"

drv=$(nix-instantiate --no-gc-warning -E "$expr")

out=$(nix-store --no-gc-warning --realize "$drv")

if [ -z "$out" ]; then
  >&2 echo "$0 failed. Exiting."
  exit 1
elif [ -t 1 ]; then
  filename=$(basename "$exec")
  echo "Nix bundle created at $filename."
  cp -f "$out" "$filename"
else
  echo "$out"
fi