mirror of
https://github.com/nix-community/home-manager
synced 2024-11-24 03:59:46 +01:00
37694e9f51
Enabling this flag for a `home.file` entry causes the target to be unconditionally overwritten. The option is not visible in documentation for now and shouldn't be relied on for general use.
321 lines
11 KiB
Nix
321 lines
11 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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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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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 = hm.dag.entryBefore ["writeBoundary"] (
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let
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# Paths that should be forcibly overwritten by Home Manager.
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# Caveat emptor!
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forcedPaths =
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concatMapStringsSep " " (p: ''"$HOME/${p}"'')
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(mapAttrsToList (n: v: v.target)
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(filterAttrs (n: v: v.force) cfg));
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check = pkgs.writeText "check" ''
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. ${./lib-bash/color-echo.sh}
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# A symbolic link whose target path matches this pattern will be
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# considered part of a Home Manager generation.
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homeFilePattern="$(readlink -e "${builtins.storeDir}")/*-home-manager-files/*"
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forcedPaths=(${forcedPaths})
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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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forced=""
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for forcedPath in "''${forcedPaths[@]}"; do
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if [[ $targetPath == $forcedPath* ]]; then
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forced="yeah"
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break
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fi
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done
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if [[ -n $forced ]]; then
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$VERBOSE_ECHO "Skipping collision check for $targetPath"
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elif [[ -e "$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 = hm.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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. ${./lib-bash/color-echo.sh}
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# A symbolic link whose target path matches this pattern will be
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# considered part of a Home Manager generation.
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homeFilePattern="$(readlink -e "${builtins.storeDir}")/*-home-manager-files/*"
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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 nix-env $VERBOSE_ARG --profile "$genProfilePath" --set "$newGenPath"
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$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 $oldGenNum"
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fi
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linkNewGen
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''
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);
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home.activation.checkFilesChanged = hm.dag.entryBefore ["linkGeneration"] (
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''
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declare -A changedFiles
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'' + concatMapStrings (v: ''
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cmp --quiet "${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 = hm.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 $out
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# Needed in case /nix is a symbolic link.
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realOut="$(realpath -m "$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 "$realOut/$relTarget")"
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# Target path must be within $HOME.
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if [[ ! $target == $realOut* ]] ; then
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echo "Error installing file '$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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