Fuse filesystem that returns symlinks to executables based on the PATH of the requesting process. This is useful to execute shebangs on NixOS that assume hard coded locations in locations like /bin or /usr/bin etc.
$ ls -l /usr/bin/{bash,python}
lr----x--t 0 root 1 Jan 1970 /usr/bin/bash -> /nix/store/j37555sj2w3xsql3f8qrwbaim7pv67hg-bash-interactive-4.4-p23/bin/bash
lr----x--t 0 root 1 Jan 1970 /usr/bin/python -> /home/joerg/.nix-profile/bin/python
$ cat > foo.py <<EOF
#!/usr/bin/python
print("hello world")
EOF
$ chmod +x ./foo.py
$ ./foo.py
hello worldChoose one of the following methods:
niv (Current recommendation)
First add it to niv:
$ niv add Mic92/envfsThen add the following to your configuration.nix in the imports list:
{
imports = [ "${(import ./nix/sources.nix).envfs}/modules/envfs.nix" ];
}As root run:
$ nix-channel --add https://github.com/Mic92/envfs/archive/main.tar.gz envfs
$ nix-channel --updateThen add the following to your configuration.nix in the imports list:
{
imports = [ <envfs/modules/envfs.nix> ];
}Add the following to your configuration.nix:
{
imports = [ "${builtins.fetchTarball "https://github.com/Mic92/envfs/archive/main.tar.gz"}/modules/envfs.nix" ];
}or with pinning:
{
imports = let
# replace this with an actual commit id or tag
commit = "f2783a8ef91624b375a3cf665c3af4ac60b7c278";
in [
"${builtins.fetchTarball {
url = "https://github.com/Mic92/envfs/archive/${commit}.tar.gz";
# replace this with an actual hash
sha256 = "0000000000000000000000000000000000000000000000000000";
}}/modules/envfs.nix"
];
}If you use experimental nix flakes support:
{
inputs.envfs.url = "github:Mic92/envfs";
inputs.envfs.inputs.nixpkgs.follows = "nixpkgs";
outputs = { self, nixpkgs, envfs }: {
# change `yourhostname` to your actual hostname
nixosConfigurations.yourhostname = nixpkgs.lib.nixosSystem {
# change to your system:
system = "x86_64-linux";
modules = [
./configuration.nix
envfs.nixosModules.envfs
];
};
};
}$ nix-build
$ sudo ./result/bin/envfs /usr/bin
$ mount --bind /usr/bin /bin
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