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home-manager: internalize uninstall

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This adds a Boolean option `uninstall`. When enabled this option will
reset side-effecting configurations to their "empty" state. The intent
is that this will cause the activation script to remove all managed
files and packages.

Doing it this way should hopefully be more robust than the previous
solution. It also allows a somewhat more convenient uninstall process
when using Flakes; put `uninstall = true` in your existing
configuration and then do a switch.

Also add simple uninstall test in CI test job.
This commit is contained in:
Robert Helgesson 2024-01-06 00:22:27 +01:00
parent 93e804e7f8
commit 7403ed4980
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GPG key ID: 96E745BD17AA17ED
7 changed files with 118 additions and 77 deletions
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32
modules/lib-bash/activation-init.sh
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@ -34,7 +34,8 @@ function migrateProfile() {
function setupVars() {
declare -r stateHome="${XDG_STATE_HOME:-$HOME/.local/state}"
declare -r userNixStateDir="$stateHome/nix"
declare -r hmGcrootsDir="$stateHome/home-manager/gcroots"
declare -gr hmStatePath="$stateHome/home-manager"
declare -r hmGcrootsDir="$hmStatePath/gcroots"
declare -r globalNixStateDir="${NIX_STATE_DIR:-/nix/var/nix}"
declare -r globalProfilesDir="$globalNixStateDir/profiles/per-user/$USER"
@ -55,6 +56,7 @@ function setupVars() {
exit 1
fi
declare -gr hmDataPath="${XDG_DATA_HOME:-$HOME/.local/share}/home-manager"
declare -gr genProfilePath="$profilesDir/home-manager"
declare -gr newGenPath="@GENERATION_DIR@";
declare -gr newGenGcPath="$hmGcrootsDir/current-home"
@ -88,6 +90,34 @@ function setupVars() {
fi
}
# Helper used to list content of a `nix profile` profile.
function nixProfileList() {
# We attempt to use `--json` first (added in Nix 2.17). Otherwise attempt to
# parse the legacy output format.
{
nix profile list --json 2>/dev/null \
| jq -r --arg name "$1" '.elements[].storePaths[] | select(endswith($name))'
} || {
nix profile list \
| { grep "$1\$" || test $? = 1; } \
| cut -d ' ' -f 4
}
}
# Helper used to remove a package from a Nix profile. Supports both `nix-env`
# and `nix profile`.
function nixProfileRemove() {
# We don't use `cfg.profileDirectory` here because it defaults to
# `/etc/profiles/per-user/<user>` which is constructed by NixOS or
# nix-darwin and won't require uninstalling `home-manager-path`.
if [[ -e $HOME/.nix-profile/manifest.json \
|| -e ${XDG_STATE_HOME:-$HOME/.local/state}/nix/profile/manifest.json ]] ; then
nixProfileList "$1" | xargs -t $DRY_RUN_CMD nix profile remove $VERBOSE_ARG
else
$DRY_RUN_CMD nix-env -e "$1" > $DRY_RUN_NULL 2>&1
fi
}
function checkUsername() {
local expectedUser="$1"