141 lines
5.1 KiB
Bash
141 lines
5.1 KiB
Bash
# 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="$stateHome/home-manager"
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declare -r globalNixStateDir="${NIX_STATE_DIR:-/nix/var/nix}"
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declare -r globalProfilesDir="$globalNixStateDir/profiles/per-user/$USER"
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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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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 stateHome="${XDG_STATE_HOME:-$HOME/.local/state}"
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declare -r userNixStateDir="$stateHome/nix"
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declare -r hmGcrootsDir="$stateHome/home-manager/gcroots"
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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 $userNixStateDir/profiles ]]; then
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declare -r profilesDir="$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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_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="$profilesDir/home-manager"
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declare -gr newGenPath="@GENERATION_DIR@";
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declare -gr newGenGcPath="$hmGcrootsDir/current-home"
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declare -gr legacyGenGcPath="$globalGcrootsDir/current-home"
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declare greatestGenNum
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greatestGenNum=$( \
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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:-}" "${oldGenPath:-}" \
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"$profilesDir" "$hmGcrootsDir"
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exit 1
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fi
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}
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if [[ -v VERBOSE ]]; then
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export VERBOSE_ECHO=echo
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export VERBOSE_ARG="--verbose"
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export VERBOSE_RUN=""
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else
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export VERBOSE_ECHO=true
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export VERBOSE_ARG=""
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export VERBOSE_RUN=true
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fi
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_i "Starting Home Manager activation"
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# Verify that we can connect to the Nix store and/or daemon. This will
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# also create the necessary directories in profiles and gcroots.
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$VERBOSE_RUN _i "Sanity checking Nix"
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nix-build --expr '{}' --no-out-link
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# Also make sure that the Nix profiles path is created.
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nix-env -q > /dev/null 2>&1 || true
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migrateProfile
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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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