you can use docker to get linux on mac
cargo is rust though, it’s going to be the same tool on mac/linux
In that case a git checkout Cargo.lock should do help recover that. If that wouldn’t help the git data was probably damaged.
This is severely outdated. Have you tried rustup update?
I meant so I can use Nix
yes I’ve tried that, buutt… rustup default nightly worked
cargo --version
cargo 1.52.0-nightly (572e20153 2021-02-24)
however, still get:
cargo install --path crates/holochain
**Installing** holochain v0.0.100 (/Users/Zeek/holochain/crates/holochain)
**Updating** git repository `https://github.com/holochain/lmdb-rs.git`
**Updating** git repository `https://github.com/holochain/rkv.git`
**Updating** git repository `https://github.com/neonphog/tokio_safe_block_on.git`
**Updating** crates.io index
**Compiling** libc v0.2.86
**Compiling** proc-macro2 v1.0.24
**Compiling** syn v1.0.60
**Compiling** serde_derive v1.0.123
**error** **: linking with `cc` failed: exit code: 1**
**=** **note** : xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
**error** **: aborting due to previous error**
**error** **:** could not compile `serde_derive`
To learn more, run the command again with --verbose.
**warning** **:** build failed, waiting for other jobs to finish...
**error** **:** failed to compile `holochain v0.0.100 (/Users/Zeek/holochain/crates/holochain)`, intermediate artifacts can be found at `/Users/Zeek/holochain/target`
Caused by:
build failed
oh I see, that’s a good start 
however we don’t require nightly so you could do rustup install stable && rustup default stable && rustup uninstall nightly
Stating that I’m not an expert on macOS is a strong understatement, however I believe @thedavidmeister already pointed out the solution for the missing xcrun here:
I’m glad to see something worked eventually.
Can you summarize here recommendations for this, based on your experience now, for future-readers?
Nix was unable to install due to error about unencrypted / read-only something weird. I had both Xcode and rust/cargo installed from redux but old versions that had trouble updating
Solution Summary
decided to use cargo method instead of Nix https://doc.rust-lang.org/cargo/getting-started/installation.html
make sure to sudo xcode-select --reset https://ma.ttias.be/mac-os-xcrun-error-invalid-active-developer-path-missing-xcrun/
also rustup update and if that does not work
then regular instructions:
git clone https://github.com/holochain/holochain
cd holochain
cargo install --path crates/holochain
should work! (might have to close and reopen terminal)
if you get:
"
Caused by:
failed to parse lock file at: /Users/username/holochain/Cargo.lock
Caused by:
invalid serialized PackageId for key package.dependencies
"
then use
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