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readme: add basic rollback instructions

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Robert Helgesson 2018-01-27 10:17:42 +01:00
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@ -25,8 +25,8 @@ distributions and NixOS versions.
Also, the `home-manager` tool does not explicitly support rollbacks at
the moment so if your home directory gets messed up you'll have to fix
it yourself (you can attempt to run the activation script for the
desired generation).
it yourself. See the [rollbacks](#rollbacks) section for instructions
on how to manually perform a rollback.
Now when your expectations have been built up and you are eager to try
all this out you can go ahead and read the rest of this text.
@ -186,6 +186,40 @@ examples run
$ man home-configuration.nix
```
Rollbacks
---------
While the `home-manager` tool does not explicitly support rollbacks at
the moment it is relatively easy to perform one manually. The steps to
do so are
1. Run `home-manager generations` to determine which generation you
wish to rollback to:
```console
$ home-manager generations
2018-01-04 11:56 : id 765 -> /nix/store/kahm1rxk77mnvd2l8pfvd4jkkffk5ijk-home-manager-generation
2018-01-03 10:29 : id 764 -> /nix/store/2wsmsliqr5yynqkdyjzb1y57pr5q2lsj-home-manager-generation
2018-01-01 12:21 : id 763 -> /nix/store/mv960kl9chn2lal5q8lnqdp1ygxngcd1-home-manager-generation
2017-12-29 21:03 : id 762 -> /nix/store/6c0k1r03fxckql4vgqcn9ccb616ynb94-home-manager-generation
2017-12-25 18:51 : id 761 -> /nix/store/czc5y6vi1rvnkfv83cs3rn84jarcgsgh-home-manager-generation
```
2. Copy the Nix store path of the generation you chose, e.g.,
/nix/store/mv960kl9chn2lal5q8lnqdp1ygxngcd1-home-manager-generation
for generation 763.
3. Run the `activate` script inside the copied store path:
```console
$ /nix/store/mv960kl9chn2lal5q8lnqdp1ygxngcd1-home-manager-generation/activate
Starting home manager activation
```
Keeping your ~ safe from harm
-----------------------------