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home-manager/modules/lib-bash/activation-init.sh
Robert Helgesson 1b8bf5c327
home-manager: avoid stray error message
Failure to create the global profiles directory is not actually an
error since we can recover. Therefore, avoid printing the mkdir error
message.
2023-03-19 23:32:23 +01:00

131 lines
4.7 KiB
Bash

# Moves the existing profile from /nix to ~ to match changed behavior in Nix
# 2.14. See https://github.com/NixOS/nix/pull/5226.
#
# Note, this function is intentionally unused for now. There remains a few open
# questions about backwards compatibility and support from
# `nix-collect-garbage`.
function migrateProfile() {
declare -r stateHome="${XDG_STATE_HOME:-$HOME/.local/state}"
declare -r hmStateDir="$stateHome/home-manager"
declare -r nixStateDir="${NIX_STATE_DIR:-/nix/var/nix}"
declare -r newProfilesDir="$hmStateDir/profiles"
declare -r oldProfilesDir="$nixStateDir/profiles/per-user/$USER"
if [[ ! -d $newProfilesDir ]]; then
_i 'Migrating profiles from %s to %s' "$oldProfilesDir" "$newProfilesDir"
mkdir -p "$newProfilesDir"
for p in "$oldProfilesDir"/home-manager-*; do
declare -r name="${p##*/}"
nix-store --realise "$p" --add-root "$newProfilesDir/$name" > /dev/null
done
cp -P "$oldProfilesDir/home-manager" "$newProfilesDir"
fi
rm "$oldProfilesDir"/home-manager-*
}
function setupVars() {
declare -r nixStateDir="${NIX_STATE_DIR:-/nix/var/nix}"
declare -r globalProfilesDir="$nixStateDir/profiles/per-user/$USER"
declare -r globalGcrootsDir="$nixStateDir/gcroots/per-user/$USER"
declare -r stateHome="${XDG_STATE_HOME:-$HOME/.local/state}"
declare -r hmStateDir="$stateHome/home-manager"
declare -r hmGcrootsDir="$hmStateDir/gcroots"
# If the global profiles path exists or we can create it, then place the HM
# profile there. Otherwise place it in the HM data directory. We prefer to
# use the global location since it makes it visible to
# `nix-collect-garbage`.
#
# In the future we may perform a one-shot migration to the new location.
#
# shellcheck disable=2174
if [[ -d "$globalProfilesDir" ]] || mkdir -m 0755 -p "$globalProfilesDir" 2>/dev/null; then
declare -r hmProfilesDir="$globalProfilesDir"
else
declare -r hmProfilesDir="$hmStateDir/profiles"
mkdir -m 0755 -p "$hmProfilesDir"
fi
declare -gr genProfilePath="$hmProfilesDir/home-manager"
declare -gr newGenPath="@GENERATION_DIR@";
declare -gr newGenGcPath="$hmGcrootsDir/current-home"
declare -gr legacyGenGcPath="$globalGcrootsDir/current-home"
declare greatestGenNum
greatestGenNum=$( \
nix-env --list-generations --profile "$genProfilePath" \
| tail -1 \
| sed -E 's/ *([[:digit:]]+) .*/\1/')
if [[ -n $greatestGenNum ]] ; then
declare -gr oldGenNum=$greatestGenNum
declare -gr newGenNum=$((oldGenNum + 1))
else
declare -gr newGenNum=1
fi
if [[ -e $genProfilePath ]] ; then
declare -g oldGenPath
oldGenPath="$(readlink -e "$genProfilePath")"
fi
$VERBOSE_RUN _i "Sanity checking oldGenNum and oldGenPath"
if [[ -v oldGenNum && ! -v oldGenPath
|| ! -v oldGenNum && -v oldGenPath ]]; then
_i $'The previous generation number and path are in conflict! These\nmust be either both empty or both set but are now set to\n\n \'%s\' and \'%s\'\n\nIf you don\'t mind losing previous profile generations then\nthe easiest solution is probably to run\n\n rm %s/home-manager*\n rm %s/current-home\n\nand trying home-manager switch again. Good luck!' \
"${oldGenNum:-}" "${oldGenPath:-}" \
"$hmProfilesDir" "$hmGcrootsDir"
exit 1
fi
}
if [[ -v VERBOSE ]]; then
export VERBOSE_ECHO=echo
export VERBOSE_ARG="--verbose"
export VERBOSE_RUN=""
else
export VERBOSE_ECHO=true
export VERBOSE_ARG=""
export VERBOSE_RUN=true
fi
_i "Starting Home Manager activation"
# Verify that we can connect to the Nix store and/or daemon. This will
# also create the necessary directories in profiles and gcroots.
$VERBOSE_RUN _i "Sanity checking Nix"
nix-build --expr '{}' --no-out-link
setupVars
if [[ -v DRY_RUN ]] ; then
_i "This is a dry run"
export DRY_RUN_CMD=echo
export DRY_RUN_NULL=/dev/stdout
else
$VERBOSE_RUN _i "This is a live run"
export DRY_RUN_CMD=""
export DRY_RUN_NULL=/dev/null
fi
if [[ -v VERBOSE ]]; then
_i 'Using Nix version: %s' "$(nix-env --version)"
fi
$VERBOSE_RUN _i "Activation variables:"
if [[ -v oldGenNum ]] ; then
$VERBOSE_ECHO " oldGenNum=$oldGenNum"
$VERBOSE_ECHO " oldGenPath=$oldGenPath"
else
$VERBOSE_ECHO " oldGenNum undefined (first run?)"
$VERBOSE_ECHO " oldGenPath undefined (first run?)"
fi
$VERBOSE_ECHO " newGenPath=$newGenPath"
$VERBOSE_ECHO " newGenNum=$newGenNum"
$VERBOSE_ECHO " genProfilePath=$genProfilePath"
$VERBOSE_ECHO " newGenGcPath=$newGenGcPath"
$VERBOSE_ECHO " legacyGenGcPath=$legacyGenGcPath"