mirror of
https://github.com/nix-community/home-manager
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f82246171b
When a configuration file would be written to an existing file, rather than failing switch (and having the user have to move or delete those files), move the files automatically to a new path. Closes #585
297 lines
10 KiB
Nix
297 lines
10 KiB
Nix
{ pkgs, config, lib, ... }:
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with lib;
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let
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cfg = config.home.file;
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dag = config.lib.dag;
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homeDirectory = config.home.homeDirectory;
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fileType = (import lib/file-type.nix {
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inherit homeDirectory lib pkgs;
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}).fileType;
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sourceStorePath = file:
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let
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sourcePath = toString file.source;
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sourceName = config.lib.strings.storeFileName (baseNameOf sourcePath);
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in
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if builtins.hasContext sourcePath
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then file.source
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else builtins.path { path = file.source; name = sourceName; };
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# A symbolic link whose target path matches this pattern will be
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# considered part of a Home Manager generation.
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homeFilePattern = "${builtins.storeDir}/*-home-manager-files/*";
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in
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{
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options = {
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home.file = mkOption {
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description = "Attribute set of files to link into the user home.";
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default = {};
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type = fileType "<envar>HOME</envar>" homeDirectory;
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};
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home-files = mkOption {
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type = types.package;
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internal = true;
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description = "Package to contain all home files";
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};
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};
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config = {
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# This verifies that the links we are about to create will not
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# overwrite an existing file.
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home.activation.checkLinkTargets = dag.entryBefore ["writeBoundary"] (
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let
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check = pkgs.writeText "check" ''
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. ${./lib-bash/color-echo.sh}
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newGenFiles="$1"
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shift
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for sourcePath in "$@" ; do
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relativePath="''${sourcePath#$newGenFiles/}"
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targetPath="$HOME/$relativePath"
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if [[ -e "$targetPath" \
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&& ! "$(readlink "$targetPath")" == ${homeFilePattern} ]] ; then
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if [[ ! -L "$targetPath" && -n "$HOME_MANAGER_BACKUP_EXT" ]] ; then
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backup="$targetPath.$HOME_MANAGER_BACKUP_EXT"
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if [[ -e "$backup" ]]; then
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errorEcho "Existing file '$backup' would be clobbered by backing up '$targetPath'"
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collision=1
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else
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warnEcho "Existing file '$targetPath' is in the way, will be moved to '$backup'"
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fi
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else
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errorEcho "Existing file '$targetPath' is in the way"
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collision=1
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fi
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fi
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done
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if [[ -v collision ]] ; then
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errorEcho "Please move the above files and try again or use -b <ext> to move automatically."
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exit 1
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fi
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'';
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in
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''
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function checkNewGenCollision() {
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local newGenFiles
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newGenFiles="$(readlink -e "$newGenPath/home-files")"
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find "$newGenFiles" \( -type f -or -type l \) \
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-exec bash ${check} "$newGenFiles" {} +
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}
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checkNewGenCollision || exit 1
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''
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);
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# This activation script will
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#
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# 1. Remove files from the old generation that are not in the new
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# generation.
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#
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# 2. Switch over the Home Manager gcroot and current profile
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# links.
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#
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# 3. Symlink files from the new generation into $HOME.
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#
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# This order is needed to ensure that we always know which links
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# belong to which generation. Specifically, if we're moving from
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# generation A to generation B having sets of home file links FA
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# and FB, respectively then cleaning before linking produces state
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# transitions similar to
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#
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# FA → FA ∩ FB → (FA ∩ FB) ∪ FB = FB
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#
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# and a failure during the intermediate state FA ∩ FB will not
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# result in lost links because this set of links are in both the
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# source and target generation.
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home.activation.linkGeneration = dag.entryAfter ["writeBoundary"] (
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let
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link = pkgs.writeText "link" ''
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newGenFiles="$1"
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shift
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for sourcePath in "$@" ; do
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relativePath="''${sourcePath#$newGenFiles/}"
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targetPath="$HOME/$relativePath"
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if [[ -e "$targetPath" && ! -L "$targetPath" && -n "$HOME_MANAGER_BACKUP_EXT" ]] ; then
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backup="$targetPath.$HOME_MANAGER_BACKUP_EXT"
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$DRY_RUN_CMD mv $VERBOSE_ARG "$targetPath" "$backup" || errorEcho "Moving '$targetPath' failed!"
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fi
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$DRY_RUN_CMD mkdir -p $VERBOSE_ARG "$(dirname "$targetPath")"
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$DRY_RUN_CMD ln -nsf $VERBOSE_ARG "$sourcePath" "$targetPath"
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done
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'';
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cleanup = pkgs.writeText "cleanup" ''
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. ${./lib-bash/color-echo.sh}
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newGenFiles="$1"
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shift 1
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for relativePath in "$@" ; do
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targetPath="$HOME/$relativePath"
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if [[ -e "$newGenFiles/$relativePath" ]] ; then
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$VERBOSE_ECHO "Checking $targetPath: exists"
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elif [[ ! "$(readlink "$targetPath")" == ${homeFilePattern} ]] ; then
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warnEcho "Path '$targetPath' not link into Home Manager generation. Skipping delete."
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else
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$VERBOSE_ECHO "Checking $targetPath: gone (deleting)"
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$DRY_RUN_CMD rm $VERBOSE_ARG "$targetPath"
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# Recursively delete empty parent directories.
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targetDir="$(dirname "$relativePath")"
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if [[ "$targetDir" != "." ]] ; then
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pushd "$HOME" > /dev/null
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# Call rmdir with a relative path excluding $HOME.
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# Otherwise, it might try to delete $HOME and exit
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# with a permission error.
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$DRY_RUN_CMD rmdir $VERBOSE_ARG \
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-p --ignore-fail-on-non-empty \
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"$targetDir"
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popd > /dev/null
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fi
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fi
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done
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'';
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in
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''
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function linkNewGen() {
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echo "Creating home file links in $HOME"
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local newGenFiles
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newGenFiles="$(readlink -e "$newGenPath/home-files")"
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find "$newGenFiles" \( -type f -or -type l \) \
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-exec bash ${link} "$newGenFiles" {} +
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}
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function cleanOldGen() {
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if [[ ! -v oldGenPath ]] ; then
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return
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fi
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echo "Cleaning up orphan links from $HOME"
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local newGenFiles oldGenFiles
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newGenFiles="$(readlink -e "$newGenPath/home-files")"
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oldGenFiles="$(readlink -e "$oldGenPath/home-files")"
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# Apply the cleanup script on each leaf in the old
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# generation. The find command below will print the
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# relative path of the entry.
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find "$oldGenFiles" '(' -type f -or -type l ')' -printf '%P\0' \
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| xargs -0 bash ${cleanup} "$newGenFiles"
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}
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cleanOldGen
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if [[ ! -v oldGenPath || "$oldGenPath" != "$newGenPath" ]] ; then
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echo "Creating profile generation $newGenNum"
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$DRY_RUN_CMD ln -Tsf $VERBOSE_ARG "$newGenPath" "$newGenProfilePath"
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$DRY_RUN_CMD ln -Tsf $VERBOSE_ARG $(basename "$newGenProfilePath") "$genProfilePath"
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$DRY_RUN_CMD ln -Tsf $VERBOSE_ARG "$newGenPath" "$newGenGcPath"
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else
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echo "No change so reusing latest profile generation $oldGenNum"
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fi
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linkNewGen
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''
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);
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home.activation.checkFilesChanged = dag.entryBefore ["linkGeneration"] (
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''
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declare -A changedFiles
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'' + concatMapStrings (v: ''
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cmp --quiet "${sourceStorePath v}" "${homeDirectory}/${v.target}" \
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&& changedFiles["${v.target}"]=0 \
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|| changedFiles["${v.target}"]=1
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'') (filter (v: v.onChange != "") (attrValues cfg))
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);
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home.activation.onFilesChange = dag.entryAfter ["linkGeneration"] (
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concatMapStrings (v: ''
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if [[ ${"$\{changedFiles"}["${v.target}"]} -eq 1 ]]; then
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${v.onChange}
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fi
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'') (filter (v: v.onChange != "") (attrValues cfg))
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);
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# Symlink directories and files that have the right execute bit.
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# Copy files that need their execute bit changed.
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home-files = pkgs.runCommand
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"home-manager-files"
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{
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nativeBuildInputs = [ pkgs.xlibs.lndir ];
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preferLocalBuild = true;
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allowSubstitutes = false;
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}
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(''
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mkdir -p $out
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function insertFile() {
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local source="$1"
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local relTarget="$2"
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local executable="$3"
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local recursive="$4"
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# Figure out the real absolute path to the target.
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local target
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target="$(realpath -m "$out/$relTarget")"
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# Target path must be within $HOME.
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if [[ ! $target == $out* ]] ; then
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echo "Error installing file '$relTarget' outside \$HOME" >&2
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exit 1
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fi
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mkdir -p "$(dirname "$target")"
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if [[ -d $source ]]; then
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if [[ $recursive ]]; then
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mkdir -p "$target"
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lndir -silent "$source" "$target"
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else
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ln -s "$source" "$target"
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fi
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else
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[[ -x $source ]] && isExecutable=1 || isExecutable=""
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# Link the file into the home file directory if possible,
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# i.e., if the executable bit of the source is the same we
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# expect for the target. Otherwise, we copy the file and
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# set the executable bit to the expected value.
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if [[ $executable == inherit || $isExecutable == $executable ]]; then
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ln -s "$source" "$target"
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else
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cp "$source" "$target"
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if [[ $executable == inherit ]]; then
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# Don't change file mode if it should match the source.
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:
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elif [[ $executable ]]; then
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chmod +x "$target"
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else
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chmod -x "$target"
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fi
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fi
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fi
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}
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'' + concatStrings (
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mapAttrsToList (n: v: ''
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insertFile "${sourceStorePath v}" \
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"${v.target}" \
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"${if v.executable == null
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then "inherit"
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else builtins.toString v.executable}" \
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"${builtins.toString v.recursive}"
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'') cfg
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));
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};
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}
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