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-rw-r--r--pkgs/tools/archivers/7zz/default.nix2
-rw-r--r--pkgs/tools/archivers/7zz/setup-hook.sh5
2 files changed, 7 insertions, 0 deletions
diff --git a/pkgs/tools/archivers/7zz/default.nix b/pkgs/tools/archivers/7zz/default.nix
index 48b072b0cf4b..a10283dc59f8 100644
--- a/pkgs/tools/archivers/7zz/default.nix
+++ b/pkgs/tools/archivers/7zz/default.nix
@@ -99,6 +99,8 @@ stdenv.mkDerivation (finalAttrs: {
 
   nativeBuildInputs = lib.optionals useUasm [ uasm ];
 
+  setupHook = ./setup-hook.sh;
+
   enableParallelBuilding = true;
 
   preBuild = "cd CPP/7zip/Bundles/Alone2";
diff --git a/pkgs/tools/archivers/7zz/setup-hook.sh b/pkgs/tools/archivers/7zz/setup-hook.sh
new file mode 100644
index 000000000000..97f2cc8a7694
--- /dev/null
+++ b/pkgs/tools/archivers/7zz/setup-hook.sh
@@ -0,0 +1,5 @@
+unpackCmdHooks+=(_tryUnpackDmg)
+_tryUnpackDmg() {
+    if ! [[ "$curSrc" =~ \.dmg$ ]]; then return 1; fi
+    7zz x "$curSrc"
+}