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https://github.com/nix-community/home-manager
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2f58d0a3de
PR #2833 Co-authored-by: David Arnold <dar@xoe.solutions> Co-authored-by: Florian Franzen <Florian.Franzen@gmail.com>
83 lines
2.7 KiB
Bash
Executable file
83 lines
2.7 KiB
Bash
Executable file
#!/usr/bin/env bash
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function setupVars() {
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local nixStateDir="${NIX_STATE_DIR:-/nix/var/nix}"
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local profilesPath="$nixStateDir/profiles/per-user/$USER"
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local gcPath="$nixStateDir/gcroots/per-user/$USER"
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declare -gr nixProfilePath="$profilesPath/profile"
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declare -gr genProfilePath="$profilesPath/home-manager"
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declare -gr newGenPath="@GENERATION_DIR@";
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declare -gr newGenGcPath="$gcPath/current-home"
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local 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 $profilesPath/home-manager ]] ; then
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oldGenPath="$(readlink -e "$profilesPath/home-manager")"
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declare -gr oldGenPath
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fi
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$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:-}" "${oldGenPath:-}" \
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"$profilesPath" "$gcPath"
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exit 1
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fi
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}
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if [[ -v VERBOSE ]]; then
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export VERBOSE_ECHO=echo
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export VERBOSE_ARG="--verbose"
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export VERBOSE_RUN=""
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else
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export VERBOSE_ECHO=true
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export VERBOSE_ARG=""
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export VERBOSE_RUN=true
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fi
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_i "Starting Home Manager activation"
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# Verify that we can connect to the Nix store and/or daemon. This will
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# also create the necessary directories in profiles and gcroots.
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$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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else
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$VERBOSE_RUN _i "This is a live run"
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export DRY_RUN_CMD=""
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fi
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if [[ -v VERBOSE ]]; then
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_i 'Using Nix version: %s' "$(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 " newGenGcPath=$newGenGcPath"
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$VERBOSE_ECHO " genProfilePath=$genProfilePath"
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