diff options
| -rw-r--r-- | pkgs/populate/default.nix | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/pkgs/populate/default.nix b/pkgs/populate/default.nix index 23ee020..ad70d2e 100644 --- a/pkgs/populate/default.nix +++ b/pkgs/populate/default.nix @@ -20,6 +20,26 @@ let fi ''; + do-backup = { target }: let + sentinelFile = "${target.path}/.populate"; + in + shell' target /* sh */ '' + if ! test -d ${quote sentinelFile}; then + >&2 printf 'error" sentinel file is not a directory: %s\n' ${quote ( + optionalString (!isLocalTarget target) "${target.host}:" + + sentinelFile + )} + exit 1 + fi + rsync >&2 \ + -aAXF \ + --delete \ + --exclude /.populate \ + --link-dest=${quote target.path} \ + ${target.path}/ \ + ${target.path}/.populate/backup/ + ''; + pop.derivation = target: source: shell' target /* sh */ '' nix-build -E ${quote source.text} -o ${quote target.path} >&2 ''; @@ -162,9 +182,11 @@ let in -{ force ? false, source, target }: writeDash "populate.${target.host}" '' +{ backup ? false, force ? false, source, target }: +writeDash "populate.${target.host}" '' set -efu ${check { inherit force target; }} set -x + ${optionalString backup (do-backup { inherit target; })} ${concatStringsSep "\n" (mapAttrsToList (populate target) source)} '' |