mirror of
https://github.com/nix-community/home-manager
synced 2024-06-30 18:38:31 +02:00
f69816489d
Specifically, if the global per-user profiles path do not exist and we cannot create it during the activation, then place our profile in the Home Manager data directory. We prefer to use the global location, though, since it makes it visible to `nix-collect-garbage`. This is intended to improve compatibility with Nix version 2.14 and later, which no longer creates the per-user directories. Also, use the Home Manager data directory to manage the gcroot for the current generation. It does not have to sit in the global per-user gcroots directory since it should never be eligible for GC.
132 lines
4.7 KiB
Bash
132 lines
4.7 KiB
Bash
# 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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function migrateProfile() {
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declare -r stateHome="${XDG_STATE_HOME:-$HOME/.local/state}"
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declare -r hmStateDir="$stateHome/home-manager"
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declare -r nixStateDir="${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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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" "$newProfilesDir"
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fi
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rm "$oldProfilesDir"/home-manager-*
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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="$hmStateDir/gcroots"
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# If the global profiles path exists or we can create it, then place the HM
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# profile there. Otherwise place it in the HM data directory. We prefer to
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# use the global location since it makes it visible to
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# `nix-collect-garbage`.
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#
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# In the future we may perform a one-shot migration to the new location.
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#
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# shellcheck disable=2174
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if [[ -d "$globalProfilesDir" ]] || mkdir -m 0755 -p "$globalProfilesDir"; then
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declare -r hmProfilesDir="$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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fi
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declare -gr genProfilePath="$hmProfilesDir/home-manager"
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declare -gr newGenPath="@GENERATION_DIR@";
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declare -gr newGenGcPath="$hmGcrootsDir/current-home"
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declare -gr legacyGenGcPath="$globalGcrootsDir/current-home"
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declare greatestGenNum
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greatestGenNum=$( \
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nix-env --list-generations --profile "$genProfilePath" \
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| tail -1 \
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| sed -E 's/ *([[:digit:]]+) .*/\1/')
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if [[ -n $greatestGenNum ]] ; then
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declare -gr oldGenNum=$greatestGenNum
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declare -gr newGenNum=$((oldGenNum + 1))
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else
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declare -gr newGenNum=1
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fi
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if [[ -e $genProfilePath ]] ; then
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declare -g oldGenPath
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oldGenPath="$(readlink -e "$genProfilePath")"
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fi
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$VERBOSE_RUN _i "Sanity checking oldGenNum and oldGenPath"
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if [[ -v oldGenNum && ! -v oldGenPath
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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" "$hmGcrootsDir"
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exit 1
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fi
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}
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if [[ -v VERBOSE ]]; then
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export VERBOSE_ECHO=echo
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export VERBOSE_ARG="--verbose"
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export VERBOSE_RUN=""
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else
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export VERBOSE_ECHO=true
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export VERBOSE_ARG=""
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export VERBOSE_RUN=true
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fi
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_i "Starting Home Manager activation"
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# Verify that we can connect to the Nix store and/or daemon. This will
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# also create the necessary directories in profiles and gcroots.
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$VERBOSE_RUN _i "Sanity checking Nix"
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nix-build --expr '{}' --no-out-link
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setupVars
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if [[ -v DRY_RUN ]] ; then
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_i "This is a dry run"
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export DRY_RUN_CMD=echo
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export DRY_RUN_NULL=/dev/stdout
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else
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$VERBOSE_RUN _i "This is a live run"
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export DRY_RUN_CMD=""
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export DRY_RUN_NULL=/dev/null
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fi
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if [[ -v VERBOSE ]]; then
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_i 'Using Nix version: %s' "$(nix-env --version)"
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fi
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$VERBOSE_RUN _i "Activation variables:"
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if [[ -v oldGenNum ]] ; then
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$VERBOSE_ECHO " oldGenNum=$oldGenNum"
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$VERBOSE_ECHO " oldGenPath=$oldGenPath"
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else
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$VERBOSE_ECHO " oldGenNum undefined (first run?)"
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$VERBOSE_ECHO " oldGenPath undefined (first run?)"
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fi
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$VERBOSE_ECHO " newGenPath=$newGenPath"
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$VERBOSE_ECHO " newGenNum=$newGenNum"
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$VERBOSE_ECHO " genProfilePath=$genProfilePath"
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$VERBOSE_ECHO " newGenGcPath=$newGenGcPath"
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$VERBOSE_ECHO " legacyGenGcPath=$legacyGenGcPath"
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