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-rw-r--r--pkgs/populate/default.nix24
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)}
''