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home-manager: migrate profiles to nix state directory
If the user runs a recent Nix version that places per-user profiles in `$XDG_STATE_DIR/nix/profiles`, then migrate the home-manager profile there. Also clean up `setupVars` a bit.
This commit is contained in:
Robert Helgesson
parent
440faf5ae4
commit
93f5cb2482
4 changed files with 113 additions and 88 deletions
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@ -1,55 +1,61 @@
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# Moves the existing profile from /nix to ~ to match changed behavior in Nix
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# 2.14. See https://github.com/NixOS/nix/pull/5226.
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#
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# Note, this function is intentionally unused for now. There remains a few open
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# questions about backwards compatibility and support from
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# `nix-collect-garbage`.
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# Moves the existing profile from /nix or $XDG_STATE_HOME/home-manager to
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# $XDG_STATE_HOME/nix to match changed behavior in Nix 2.14. See
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# https://github.com/NixOS/nix/pull/5226.
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function migrateProfile() {
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declare -r stateHome="${XDG_STATE_HOME:-$HOME/.local/state}"
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declare -r userNixStateDir="$stateHome/nix"
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declare -r hmStateDir="$stateHome/home-manager"
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declare -r nixStateDir="${NIX_STATE_DIR:-/nix/var/nix}"
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declare -r newProfilesDir="$hmStateDir/profiles"
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declare -r oldProfilesDir="$nixStateDir/profiles/per-user/$USER"
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declare -r globalNixStateDir="${NIX_STATE_DIR:-/nix/var/nix}"
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declare -r globalProfilesDir="$globalNixStateDir/profiles/per-user/$USER"
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if [[ ! -d $newProfilesDir ]]; then
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_i 'Migrating profiles from %s to %s' "$oldProfilesDir" "$newProfilesDir"
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mkdir -p "$newProfilesDir"
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for p in "$oldProfilesDir"/home-manager-*; do
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declare -r name="${p##*/}"
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nix-store --realise "$p" --add-root "$newProfilesDir/$name" > /dev/null
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done
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cp -P "$oldProfilesDir/home-manager" "$newProfilesDir"
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if [[ -e $globalProfilesDir/home-manager ]]; then
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declare -r oldProfilesDir="$globalProfilesDir"
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elif [[ -e $hmStateDir/profiles/home-manager ]]; then
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declare -r oldProfilesDir="$hmStateDir/profiles"
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fi
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rm "$oldProfilesDir"/home-manager-*
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declare -r newProfilesDir="$userNixStateDir/profiles"
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if [[ -v oldProfilesDir && -e $newProfilesDir ]]; then
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if [[ ! -e $newProfilesDir/home-manager ]]; then
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_i 'Migrating profile from %s to %s' "$oldProfilesDir" "$newProfilesDir"
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for p in "$oldProfilesDir"/home-manager-*; do
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declare name="${p##*/}"
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nix-store --realise "$p" --add-root "$newProfilesDir/$name" > /dev/null
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done
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cp -P "$oldProfilesDir/home-manager" "$newProfilesDir"
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fi
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rm "$oldProfilesDir/home-manager" "$oldProfilesDir"/home-manager-*
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fi
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}
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function setupVars() {
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declare -r nixStateDir="${NIX_STATE_DIR:-/nix/var/nix}"
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declare -r globalProfilesDir="$nixStateDir/profiles/per-user/$USER"
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declare -r globalGcrootsDir="$nixStateDir/gcroots/per-user/$USER"
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declare -r stateHome="${XDG_STATE_HOME:-$HOME/.local/state}"
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declare -r hmStateDir="$stateHome/home-manager"
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declare -r hmGcrootsDir="$hmStateDir/gcroots"
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declare -r userNixStateDir="$stateHome/nix"
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declare -r hmGcrootsDir="$stateHome/home-manager/gcroots"
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# If the global profiles path exists or we can create it, then place the HM
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# profile there. Otherwise place it in the HM data directory. We prefer to
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# use the global location since it makes it visible to
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# `nix-collect-garbage`.
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#
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# In the future we may perform a one-shot migration to the new location.
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declare -r globalNixStateDir="${NIX_STATE_DIR:-/nix/var/nix}"
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declare -r globalProfilesDir="$globalNixStateDir/profiles/per-user/$USER"
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declare -r globalGcrootsDir="$globalNixStateDir/gcroots/per-user/$USER"
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# If the user Nix profiles path exists, then place the HM profile there.
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# Otherwise, if the global Nix per-user state directory exists then use
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# that. If neither exists, then we give up.
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#
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# shellcheck disable=2174
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if [[ -d "$globalProfilesDir" ]] || mkdir -m 0755 -p "$globalProfilesDir" 2>/dev/null; then
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declare -r hmProfilesDir="$globalProfilesDir"
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if [[ -d $userNixStateDir/profiles ]]; then
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declare -r profilesDir="$userNixStateDir/profiles"
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elif [[ -d $globalProfilesDir ]]; then
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declare -r profilesDir="$globalProfilesDir"
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else
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declare -r hmProfilesDir="$hmStateDir/profiles"
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mkdir -m 0755 -p "$hmProfilesDir"
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_iError 'Could not find suitable profile directory, tried %s and %s' \
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"$userNixStateDir/profiles" "$globalProfilesDir" >&2
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exit 1
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fi
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declare -gr genProfilePath="$hmProfilesDir/home-manager"
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declare -gr genProfilePath="$profilesDir/home-manager"
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declare -gr newGenPath="@GENERATION_DIR@";
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declare -gr newGenGcPath="$hmGcrootsDir/current-home"
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declare -gr legacyGenGcPath="$globalGcrootsDir/current-home"
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@ -77,7 +83,7 @@ function setupVars() {
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|| ! -v oldGenNum && -v oldGenPath ]]; then
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_i $'The previous generation number and path are in conflict! These\nmust be either both empty or both set but are now set to\n\n \'%s\' and \'%s\'\n\nIf you don\'t mind losing previous profile generations then\nthe easiest solution is probably to run\n\n rm %s/home-manager*\n rm %s/current-home\n\nand trying home-manager switch again. Good luck!' \
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"${oldGenNum:-}" "${oldGenPath:-}" \
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"$hmProfilesDir" "$hmGcrootsDir"
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"$profilesDir" "$hmGcrootsDir"
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exit 1
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fi
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}
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@ -99,6 +105,7 @@ _i "Starting Home Manager activation"
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$VERBOSE_RUN _i "Sanity checking Nix"
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nix-build --expr '{}' --no-out-link
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migrateProfile
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setupVars
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if [[ -v DRY_RUN ]] ; then
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@ -109,7 +116,6 @@ else
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$VERBOSE_RUN _i "This is a live run"
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export DRY_RUN_CMD=""
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export DRY_RUN_NULL=/dev/null
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fi
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if [[ -v VERBOSE ]]; then
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