home-manager: use nix-env to list generations

Using the `nix-env` command is far more robust. It also has the
benefit that if the per-user `profiles` and `gcroots` directories do
not exist then they will be created with the correct permissions.

Because of the second point this commit also removes the `mkdir` step
of the installation instructions.

PR #1239
Closes #474, #948, #1091

(cherry picked from commit 9ec9f004e1)
This commit is contained in:
Robert Helgesson 2020-05-16 18:09:09 +02:00
parent a378bccd60
commit 25ddbf4824
No known key found for this signature in database
GPG key ID: 36BDAA14C2797E89
4 changed files with 24 additions and 50 deletions

View file

@ -4,9 +4,6 @@ os:
- linux
- osx
before_script:
- mkdir -m 0755 -p /nix/var/nix/{profiles,gcroots}/per-user/$USER
script:
- ./format -c
- nix-shell . -A install

View file

@ -46,21 +46,12 @@ Installation
Currently the easiest way to install Home Manager is as follows:
1. Make sure you have a working Nix installation. If you are not
using NixOS then you may here have to run
```console
$ mkdir -m 0755 -p /nix/var/nix/{profiles,gcroots}/per-user/$USER
```
since Home Manager uses these directories to manage your profile
generations. On NixOS these should already be available.
Also make sure that your user is able to build and install Nix
packages. For example, you should be able to successfully run a
command like `nix-instantiate '<nixpkgs>' -A hello` without having
to switch to the root user. For a multi-user install of Nix this
means that your user must be covered by the
1. Make sure you have a working Nix installation. Specifically, make
sure that your user is able to build and install Nix packages. For
example, you should be able to successfully run a command like
`nix-instantiate '<nixpkgs>' -A hello` without having to switch to
the root user. For a multi-user install of Nix this means that
your user must be covered by the
[`allowed-users`][nixAllowedUsers] Nix option. On NixOS you can
control this option using the
[`nix.allowedUsers`][nixosAllowedUsers] system option.

View file

@ -44,22 +44,12 @@
<orderedlist>
<listitem>
<para>
Make sure you have a working Nix installation. If you are not using NixOS
then it may be necessary to run
</para>
<screen>
<prompt>$</prompt> <userinput>mkdir -m 0755 -p /nix/var/nix/{profiles,gcroots}/per-user/$USER</userinput>
</screen>
<para>
since Home Manager uses these directories to manage your profile
generations. On NixOS these should already be available.
</para>
<para>
Also make sure that your user is able to build and install Nix packages.
For example, you should be able to successfully run a command like
<literal>nix-instantiate '&lt;nixpkgs&gt;' -A hello</literal> without
having to switch to the root user. For a multi-user install of Nix this
means that your user must be covered by the
Make sure you have a working Nix installation. Specifically, make
sure that your user is able to build and install Nix packages.
For example, you should be able to successfully run a command
like <literal>nix-instantiate '&lt;nixpkgs&gt;' -A hello</literal>
without having to switch to the root user. For a multi-user
install of Nix this means that your user must be covered by the
<link xlink:href="https://nixos.org/nix/manual/#conf-allowed-users"><literal>allowed-users</literal></link>
Nix option. On NixOS you can control this option using the
<link xlink:href="https://nixos.org/nixos/manual/options.html#opt-nix.allowedUsers"><literal>nix.allowedUsers</literal></link>

View file

@ -3,13 +3,16 @@
function setupVars() {
local profilesPath="/nix/var/nix/profiles/per-user/$USER"
local gcPath="/nix/var/nix/gcroots/per-user/$USER"
local greatestGenNum
genProfilePath="$profilesPath/home-manager"
newGenPath="@GENERATION_DIR@";
newGenGcPath="$gcPath/current-home"
local greatestGenNum
greatestGenNum=$( \
find "$profilesPath" -name 'home-manager-*-link' \
| sed 's/^.*-\([0-9]*\)-link$/\1/' \
| sort -rn \
| head -1)
nix-env --list-generations --profile "$genProfilePath" \
| tail -1 \
| sed -E 's/ *([[:digit:]]+) .*/\1/')
if [[ -n $greatestGenNum ]] ; then
oldGenNum=$greatestGenNum
@ -18,15 +21,15 @@ function setupVars() {
newGenNum=1
fi
if [[ -e $gcPath/current-home ]] ; then
oldGenPath="$(readlink -e "$gcPath/current-home")"
if [[ -e $profilesPath/home-manager ]] ; then
oldGenPath="$(readlink -e "$profilesPath/home-manager")"
fi
$VERBOSE_ECHO "Sanity checking oldGenNum and oldGenPath"
if [[ -v oldGenNum && ! -v oldGenPath
|| ! -v oldGenNum && -v oldGenPath ]]; then
errorEcho "Invalid profile number and GC root values! These must be"
errorEcho "either both empty or both set but are now set to"
errorEcho "Invalid profile number and current profile values! These"
errorEcho "must be either both empty or both set but are now set to"
errorEcho " '${oldGenNum:-}' and '${oldGenPath:-}'"
errorEcho "If you don't mind losing previous profile generations then"
errorEcho "the easiest solution is probably to run"
@ -35,12 +38,6 @@ function setupVars() {
errorEcho "and trying home-manager switch again. Good luck!"
exit 1
fi
genProfilePath="$profilesPath/home-manager"
newGenPath="@GENERATION_DIR@";
newGenProfilePath="$profilesPath/home-manager-$newGenNum-link"
newGenGcPath="$gcPath/current-home"
}
if [[ -v VERBOSE ]]; then
@ -78,6 +75,5 @@ else
fi
$VERBOSE_ECHO " newGenPath=$newGenPath"
$VERBOSE_ECHO " newGenNum=$newGenNum"
$VERBOSE_ECHO " newGenProfilePath=$newGenProfilePath"
$VERBOSE_ECHO " newGenGcPath=$newGenGcPath"
$VERBOSE_ECHO " genProfilePath=$genProfilePath"