de0070c4cf
This represents the first step in migrating `home.file` to support
arbitrary absolute paths. This is to allow Home Manager to manage
files anywhere, provided the user has sufficient privileges.
For example, with this change the configuration
home.file."test/one".text = "foo";
home.file."/test/two".text = "foo";
will result in the files "$HOME/test/one" and "/test/two",
respectively. Note, a relative file name will still be relative
`$HOME`.
To allow a reasonable transition between the old and new path handling
we introduce the notion of "generation directory layout version". The
version is simply a file `version` within the generation directory
containing a number indicating the version number.
The version 0 (also implied if the version file is missing) indicates
the legacy layout where managed file paths always are relative
`$HOME`.
Version 1 indicates the new layout where managed file paths are
relative `/`.
101 lines
3.1 KiB
Bash
Executable file
101 lines
3.1 KiB
Bash
Executable file
#!/usr/bin/env bash
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function setupVars() {
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local nixStateDir="${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 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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declare -g newGenLayoutVersion
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if [[ -f $newGenPath/version ]]; then
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newGenLayoutVersion=$(< "$newGenPath/version")
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else
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newGenLayoutVersion=0
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fi
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readonly newGenLayoutVersion
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local greatestGenNum
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greatestGenNum=$( \
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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 $greatestGenNum ]] ; then
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oldGenNum=$greatestGenNum
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newGenNum=$((oldGenNum + 1))
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else
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newGenNum=1
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fi
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if [[ -e $profilesPath/home-manager ]] ; then
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declare -g oldGenPath oldGenLayoutVersion
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oldGenPath="$(readlink -e "$profilesPath/home-manager")"
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if [[ -f $oldGenPath/version ]]; then
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oldGenLayoutVersion=$(< "$oldGenPath/version")
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else
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oldGenLayoutVersion=0
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fi
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readonly oldGenPath oldGenLayoutVersion
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fi
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$VERBOSE_ECHO "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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errorEcho "Invalid profile number and current profile values! These"
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errorEcho "must be either both empty or both set but are now set to"
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errorEcho " '${oldGenNum:-}' and '${oldGenPath:-}'"
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errorEcho "If you don't mind losing previous profile generations then"
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errorEcho "the easiest solution is probably to run"
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errorEcho " rm $profilesPath/home-manager*"
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errorEcho " rm $gcPath/current-home"
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errorEcho "and trying home-manager switch again. Good luck!"
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exit 1
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fi
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}
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if [[ -v VERBOSE ]]; then
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export VERBOSE_ECHO=echo
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export VERBOSE_ARG="--verbose"
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else
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export VERBOSE_ECHO=true
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export VERBOSE_ARG=""
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fi
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echo "Starting home manager activation"
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# Verify that we can connect to the Nix store and/or daemon. This will
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# also create the necessary directories in profiles and gcroots.
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$VERBOSE_ECHO "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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echo "This is a dry run"
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export DRY_RUN_CMD=echo
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else
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$VERBOSE_ECHO "This is a live run"
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export DRY_RUN_CMD=""
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fi
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if [[ -v VERBOSE ]]; then
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echo -n "Using Nix version: "
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nix-env --version
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fi
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$VERBOSE_ECHO "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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