initial commit

encrypted-segfault-fix.patch

@@ -0,0 +1,13 @@
+*** ext4magic-fix-segfault-extent-free.patch
+--- a/src/block.c
++++ b/src/block.c
+@@ -699,7 +699,7 @@ errcode_t local_block_iterate3(ext2_fils
+ 		mark_extent_block(fs, (char*) inode.i_block);
+
+ 	extent_errout:
+-		local_ext2fs_extent_free(handle);
++		ext2fs_extent_free(handle);
+ 		ret |= BLOCK_ERROR | BLOCK_ABORT;
+ 		goto errout;
+ 	}
+

ext4magic.nix

@@ -0,0 +1,45 @@
+{ lib, stdenv, fetchurl, fetchpatch, file, libuuid, e2fsprogs, zlib, bzip2, ... }:
+# This and glibc-fix.patch were copied from nixpkgs on 2024/03/16
+# /pkgs/tools/filesystems/ext4magic/default.nix
+# https://github.com/NixOS/nixpkgs/blob/master/pkgs/tools/filesystems/ext4magic/default.nix
+
+stdenv.mkDerivation rec {
+  version = "0.3.2";
+  pname = "ext4magic";
+
+  src = fetchurl {
+    url = "mirror://sourceforge/ext4magic/${pname}-${version}.tar.gz";
+    sha256 = "8d9c6a594f212aecf4eb5410d277caeaea3adc03d35378257dfd017ef20ea115";
+  };
+
+  patches = [
+    (fetchpatch {
+        url = "https://sourceforge.net/p/ext4magic/tickets/10/attachment/ext4magic-0.3.2-i_dir_acl.patch";
+        sha256 = "1accydd8kigid68yir2fbihm3r3x8ws3iyznp25snkx41w6y6x8c";
+    })
+    ./glibc-fix.patch
+    ./encrypted-segfault-fix.patch
+  ];
+
+  buildInputs = [ file libuuid e2fsprogs zlib bzip2 ];
+  installFlags = [ "PREFIX=$(out)" ];
+
+  meta = with lib; {
+    description = "Recover / undelete files from ext3 or ext4 partitions";
+    longDescription = ''
+      ext4magic can recover/undelete files from ext3 or ext4 partitions
+      by retrieving file-information from the filesystem journal.
+
+      If the information in the journal are sufficient, ext4magic can
+      recover the most file types, with original filename, owner and group,
+      file mode bits and also the old atime/mtime stamps.
+
+      It's much more effective and works much better than extundelete.
+    '';
+    homepage = "https://ext4magic.sourceforge.net/ext4magic_en.html";
+    license = licenses.gpl2;
+    platforms = platforms.linux;
+    maintainers = [ maintainers.rkoe ];
+    mainProgram = "ext4magic";
+  };
+}

flake.nix

@@ -0,0 +1,21 @@
+{
+  description = "a patched version of ext4magic that might not segfault on encrypted drives. patch from markusbauer@users.sourceforge.net https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=854497";
+  inputs = {
+    nixpkgs = { url = "github:NixOS/nixpkgs/nixos-unstable"; };
+  };
+
+  outputs = inputs@{ self, nixpkgs, ... }:
+  {
+    packages = let
+      pkgSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+      packagesForEachSystem = f: nixpkgs.lib.genAttrs pkgSystems (system: f {
+        pkgs = import nixpkgs { inherit system; };
+      });
+    in packagesForEachSystem ({ pkgs }:
+      let
+        ext4magic = import ./ext4magic.nix pkgs; # needed to add `, ...` to the imported module's param list so it would be ok with the presence of other params like `system`
+      in {
+        default = ext4magic;
+      });
+  };
+}

glibc-fix.patch

@@ -0,0 +1,12 @@
+diff --git a/src/recover.c b/src/recover.c
+index 41b4aee..30b5d8f 100644
+--- a/src/recover.c
++++ b/src/recover.c
+@@ -24,6 +24,7 @@
+ #include <errno.h>
+ #include <fcntl.h>
+ #include <utime.h>
++#include <sys/sysmacros.h>
+
+ #ifndef O_LARGEFILE
+ #define O_LARGEFILE 0