195 lines
7 KiB
Bash
Executable file
195 lines
7 KiB
Bash
Executable file
# 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="$stateHome/nix"
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declare -gr hmStatePath="$stateHome/home-manager"
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declare -r hmGcrootsDir="$hmStatePath/gcroots"
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declare -r globalNixStateDir="${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 hmDataPath="${XDG_DATA_HOME:-$HOME/.local/share}/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="$globalGcrootsDir/current-home"
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declare greatestGenNum
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greatestGenNum=$( \
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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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_iVerbose "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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# Helper used to list content of a `nix profile` profile.
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function nixProfileList() {
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# We attempt to use `--json` first (added in Nix 2.17). Otherwise attempt to
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# parse the legacy output format.
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{
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nix profile list --json 2>/dev/null \
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| jq -r --arg name "$1" '.elements[].storePaths[] | select(endswith($name))'
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} || {
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nix profile list \
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| { grep "$1\$" || test $? = 1; } \
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| cut -d ' ' -f 4
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}
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}
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# Helper used to remove a package from a Nix profile. Supports both `nix-env`
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# and `nix profile`.
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function nixProfileRemove() {
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# We don't use `cfg.profileDirectory` here because it defaults to
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# `/etc/profiles/per-user/<user>` which is constructed by NixOS or
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# nix-darwin and won't require uninstalling `home-manager-path`.
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if [[ -e $HOME/.nix-profile/manifest.json \
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|| -e ${XDG_STATE_HOME:-$HOME/.local/state}/nix/profile/manifest.json ]] ; then
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nixProfileList "$1" | xargs -rt $DRY_RUN_CMD nix profile remove $VERBOSE_ARG
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else
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if nix-env -q | grep -q "^$1$"; then
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run --quiet nix-env -e "$1"
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fi
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fi
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}
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function checkUsername() {
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local expectedUser="$1"
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if [[ "$USER" != "$expectedUser" ]]; then
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_iError 'Error: USER is set to "%s" but we expect "%s"' "$USER" "$expectedUser"
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exit 1
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fi
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}
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function checkHomeDirectory() {
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local expectedHome="$1"
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if ! [[ $HOME -ef $expectedHome ]]; then
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_iError 'Error: HOME is set to "%s" but we expect "%s"' "$HOME" "$expectedHome"
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exit 1
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fi
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}
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# Note, the VERBOSE_ECHO variable is deprecated and should not be used inside
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# the Home Manager project. It is provided here for backwards compatibility.
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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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_iVerbose "Sanity checking Nix"
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nix-build --quiet --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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# Note, the DRY_RUN_CMD and DRY_RUN_NULL variables are deprecated and should not
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# be used inside the Home Manager project. They are provided here for backwards
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# compatibility.
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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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_iVerbose "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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_iVerbose "Activation variables:"
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if [[ -v oldGenNum ]] ; then
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verboseEcho " oldGenNum=$oldGenNum"
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verboseEcho " oldGenPath=$oldGenPath"
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else
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verboseEcho " oldGenNum undefined (first run?)"
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verboseEcho " oldGenPath undefined (first run?)"
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fi
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verboseEcho " newGenPath=$newGenPath"
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verboseEcho " newGenNum=$newGenNum"
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verboseEcho " genProfilePath=$genProfilePath"
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verboseEcho " newGenGcPath=$newGenGcPath"
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verboseEcho " legacyGenGcPath=$legacyGenGcPath"
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