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home-manager: add backup overwrite option

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When using the backupFileExtension option, if the backup file exists,
the activation process fails. This adds an option to instead overwrite
the old backup instead of failing.
This commit is contained in:
saygo-png 2025-09-24 22:11:51 +02:00 • committed by Austin Horstman
parent 7500458e85
commit 004753ae6b
5 changed files with 21 additions and 8 deletions
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3
modules/files.nix
View file

@ -149,6 +149,9 @@ in
if [[ -e "$targetPath" && ! -L "$targetPath" && -n "$HOME_MANAGER_BACKUP_EXT" ]] ; then
# The target exists, back it up
backup="$targetPath.$HOME_MANAGER_BACKUP_EXT"
if [[ -e "$backup" && -n "$HOME_MANAGER_BACKUP_OVERWRITE" ]]; then
run rm $VERBOSE_ARG "$backup"
fi
run mv $VERBOSE_ARG "$targetPath" "$backup" || errorEcho "Moving '$targetPath' failed!"
fi

4
modules/files/check-link-targets.sh
View file

@ -33,8 +33,10 @@ for sourcePath in "$@" ; do
elif [[ ! -L "$targetPath" && -n "$HOME_MANAGER_BACKUP_EXT" ]] ; then
# Next, try to move the file to a backup location if configured and possible
backup="$targetPath.$HOME_MANAGER_BACKUP_EXT"
if [[ -e "$backup" ]]; then
if [[ -e "$backup" && -z "$HOME_MANAGER_BACKUP_OVERWRITE" ]] ; then
collisionErrors+=("Existing file '$backup' would be clobbered by backing up '$targetPath'")
elif [[ -e "$backup" && -n "$HOME_MANAGER_BACKUP_OVERWRITE" ]] ; then
warnEcho "Existing file '$targetPath' is in the way of '$sourcePath' and '$backup' exists. Backup will be clobbered due to HOME_MANAGER_BACKUP_OVERWRITE=1"
else
warnEcho "Existing file '$targetPath' is in the way of '$sourcePath', will be moved to '$backup'"
fi

1
nix-darwin/default.nix
View file

@ -28,6 +28,7 @@ in
${lib.optionalString (
cfg.backupFileExtension != null
) "export HOME_MANAGER_BACKUP_EXT=${lib.escapeShellArg cfg.backupFileExtension}"}
${lib.optionalString cfg.overwriteBackup "export HOME_MANAGER_BACKUP_OVERWRITE=1"}
${lib.optionalString cfg.verbose "export VERBOSE=1"}
exec ${usercfg.home.activationPackage}/activate --driver-version ${driverVersion} >&2
''}

4
nixos/common.nix
View file

@ -91,6 +91,10 @@ in
'';
};
overwriteBackup = mkEnableOption ''
forced overwriting of existing backup files when using `backupFileExtension`
'';
extraSpecialArgs = mkOption {
type = types.attrs;
default = { };

17
nixos/default.nix
View file

@ -7,15 +7,18 @@
}:
let
inherit (lib) mkIf;
cfg = config.home-manager;
serviceEnvironment =
lib.optionalAttrs (cfg.backupFileExtension != null) {
HOME_MANAGER_BACKUP_EXT = cfg.backupFileExtension;
}
// lib.optionalAttrs cfg.verbose { VERBOSE = "1"; };
serviceEnvironment = lib.mkMerge [
(mkIf cfg.verbose { VERBOSE = "1"; })
(mkIf (cfg.backupFileExtension != null) {
HOME_MANAGER_BACKUP_EXT = cfg.backupFileExtension;
})
(mkIf cfg.overwriteBackup { HOME_MANAGER_BACKUP_OVERWRITE = "1"; })
];
in
{
imports = [ ./common.nix ];
@ -41,7 +44,7 @@ in
];
};
}
(lib.mkIf (cfg.users != { }) {
(mkIf (cfg.users != { }) {
systemd.services = lib.mapAttrs' (
_: usercfg:
let