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add info about MacOS Catalina workaround 

Signed-off-by: Jakub Sokołowski <jakub@status.im>
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Jakub Sokołowski 2019-10-15 19:00:59 +02:00
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nix/README.md
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@ -22,3 +22,30 @@ make shell TARGET_OS=android
This way your shell and all other nix commands should run in a setup that is tailored towards Android development.
For valid values you can check the [`nix/platform.nix`](/nix/platform.nix) file.
# Known Issues
## MacOS 10.15 "Catalina"
There is an unsolved issue with the root(`/`) file system in `10.15` being read-only:
https://github.com/NixOS/nix/issues/2925
Our current recommended workaround is putting `/nix` under `/opt/nix` and symlinking it via `/etc/synthetic.conf`:
```bash
sudo mkdir /opt/nix
sudo chown ${USER} /opt/nix
sudo sh -c "echo 'nix\t/opt/nix' >> /etc/synthetic.conf"
reboot
```
After the system reboots you should see the `/nix` symlink in place:
```
% ls -l /nix
lrwxr-xr-x 1 root wheel 8 Oct 11 13:53 /nix -> /opt/nix
```
In order to be able to use Nix with a symlinked `/nix` you need to include this in your shell:
```bash
export NIX_IGNORE_SYMLINK_STORE=1
```
Add it to your `.bashrc` or any other shell config file.
__NOTE__: Your old `/nix` directory will end up in `/Users/Shared/Relocated Items/Security/nix` after OS upgrade.