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guix: Update documentation for time-machine 

Wait a minute, doc. Are you telling me you built a time machine... Out
of a functional package manager?
This commit is contained in:
Carl Dong 2020-01-27 16:38:34 -05:00
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contrib/guix/README.md
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@ -62,15 +62,16 @@ Likewise, to perform a bootstrapped build (takes even longer):
export ADDITIONAL_GUIX_ENVIRONMENT_FLAGS='--bootstrap --no-substitutes'
```
### Using the right Guix
### Using a version of Guix with `guix time-machine` capabilities
Once Guix is installed, deploy our patched version into your current Guix
profile. The changes there are slowly being upstreamed.
> Note: This entire section can be skipped if you are already using a version of
> Guix that has [the `guix time-machine` command][guix/time-machine].
Once Guix is installed, if it doesn't have the `guix time-machine` command, pull
the latest `guix`.
```sh
guix pull --url=https://github.com/dongcarl/guix.git \
--commit=82c77e52b8b46e0a3aad2cb12307c2e30547deec \
--max-jobs=4 # change accordingly
guix pull --max-jobs=4 # change number of jobs accordingly
```
Make sure that you are using your current profile. (You are prompted to do this
@ -80,9 +81,6 @@ at the end of the `guix pull`)
export PATH="${HOME}/.config/guix/current/bin${PATH:+:}$PATH"
```
> Note: There is ongoing work to eliminate this entire section using Guix
> [inferiors][guix/inferiors] and [channels][guix/channels].
## Usage
### As a Development Environment
@ -224,6 +222,7 @@ repository and will likely put one up soon.
[guix/substitute-server-auth]: https://www.gnu.org/software/guix/manual/en/html_node/Substitute-Server-Authorization.html
[guix/inferiors]: https://www.gnu.org/software/guix/manual/en/html_node/Inferiors.html
[guix/channels]: https://www.gnu.org/software/guix/manual/en/html_node/Channels.html
[guix/time-machine]: https://guix.gnu.org/manual/en/html_node/Invoking-guix-time_002dmachine.html
[debian/guix-package]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=850644
[fanquake/guix-docker]: https://github.com/fanquake/core-review/tree/master/guix