diff --git a/pkgs/build-support/fetchbzr/builder.sh b/pkgs/build-support/fetchbzr/builder.sh
index 380642a5e681..991864719a07 100644
--- a/pkgs/build-support/fetchbzr/builder.sh
+++ b/pkgs/build-support/fetchbzr/builder.sh
@@ -5,4 +5,4 @@ echo "exporting \`$url' (revision $rev) into \`$out'"
 
 # Perform a lightweight checkout so that we don't end up importing
 # all the repository's history.
-BZR_LOG=/dev/null bzr -Ossl.cert_reqs=none export -r "$rev" --format=dir "$out" "$url"
+XDG_CACHE_HOME="$TMPDIR" BRZ_LOG=/dev/null bzr -Ossl.cert_reqs=none export -r "$rev" --format=dir "$out" "$url"
diff --git a/pkgs/development/python-modules/breezy/Cargo.lock b/pkgs/development/python-modules/breezy/Cargo.lock
new file mode 100644
index 000000000000..7333bfe40f31
--- /dev/null
+++ b/pkgs/development/python-modules/breezy/Cargo.lock
@@ -0,0 +1,311 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "aho-corasick"
+version = "0.7.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cc936419f96fa211c1b9166887b38e5e40b19958e5b895be7c1f93adec7071ac"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "autocfg"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
+
+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
+[[package]]
+name = "breezy"
+version = "3.3.2"
+dependencies = [
+ "pyo3",
+]
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "indoc"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "47741a8bc60fb26eb8d6e0238bbb26d8575ff623fdc97b1a2c00c050b9684ed8"
+dependencies = [
+ "indoc-impl",
+ "proc-macro-hack",
+]
+
+[[package]]
+name = "indoc-impl"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce046d161f000fffde5f432a0d034d0341dc152643b2598ed5bfce44c4f3a8f0"
+dependencies = [
+ "proc-macro-hack",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "unindent",
+]
+
+[[package]]
+name = "instant"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a5bbe824c507c5da5956355e86a746d82e0e1464f65d862cc5e71da70e94b2c"
+dependencies = [
+ "cfg-if",
+]
+
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
+[[package]]
+name = "libc"
+version = "0.2.139"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "201de327520df007757c1f0adce6e827fe8562fbc28bfd9c15571c66ca1f5f79"
+
+[[package]]
+name = "lock_api"
+version = "0.4.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "435011366fe56583b16cf956f9df0095b405b82d76425bc8981c0e22e60ec4df"
+dependencies = [
+ "autocfg",
+ "scopeguard",
+]
+
+[[package]]
+name = "memchr"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
+
+[[package]]
+name = "once_cell"
+version = "1.17.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
+
+[[package]]
+name = "parking_lot"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7d17b78036a60663b797adeaee46f5c9dfebb86948d1255007a1d6be0271ff99"
+dependencies = [
+ "instant",
+ "lock_api",
+ "parking_lot_core",
+]
+
+[[package]]
+name = "parking_lot_core"
+version = "0.8.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "60a2cfe6f0ad2bfc16aefa463b497d5c7a5ecd44a23efa72aa342d90177356dc"
+dependencies = [
+ "cfg-if",
+ "instant",
+ "libc",
+ "redox_syscall",
+ "smallvec",
+ "winapi",
+]
+
+[[package]]
+name = "paste"
+version = "0.1.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "45ca20c77d80be666aef2b45486da86238fabe33e38306bd3118fe4af33fa880"
+dependencies = [
+ "paste-impl",
+ "proc-macro-hack",
+]
+
+[[package]]
+name = "paste-impl"
+version = "0.1.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d95a7db200b97ef370c8e6de0088252f7e0dfff7d047a28528e47456c0fc98b6"
+dependencies = [
+ "proc-macro-hack",
+]
+
+[[package]]
+name = "proc-macro-hack"
+version = "0.5.20+deprecated"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc375e1527247fe1a97d8b7156678dfe7c1af2fc075c9a4db3690ecd2a148068"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.51"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d727cae5b39d21da60fa540906919ad737832fe0b1c165da3a34d6548c849d6"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "pyo3"
+version = "0.15.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d41d50a7271e08c7c8a54cd24af5d62f73ee3a6f6a314215281ebdec421d5752"
+dependencies = [
+ "cfg-if",
+ "indoc",
+ "libc",
+ "parking_lot",
+ "paste",
+ "pyo3-build-config",
+ "pyo3-macros",
+ "unindent",
+]
+
+[[package]]
+name = "pyo3-build-config"
+version = "0.15.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "779239fc40b8e18bc8416d3a37d280ca9b9fb04bda54b98037bb6748595c2410"
+dependencies = [
+ "once_cell",
+]
+
+[[package]]
+name = "pyo3-macros"
+version = "0.15.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "00b247e8c664be87998d8628e86f282c25066165f1f8dda66100c48202fdb93a"
+dependencies = [
+ "pyo3-macros-backend",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "pyo3-macros-backend"
+version = "0.15.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a8c2812c412e00e641d99eeb79dd478317d981d938aa60325dfa7157b607095"
+dependencies = [
+ "proc-macro2",
+ "pyo3-build-config",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8856d8364d252a14d474036ea1358d63c9e6965c8e5c1885c18f73d70bff9c7b"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "redox_syscall"
+version = "0.2.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fb5a58c1855b4b6819d59012155603f0b22ad30cad752600aadfcb695265519a"
+dependencies = [
+ "bitflags",
+]
+
+[[package]]
+name = "regex"
+version = "1.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "48aaa5748ba571fb95cd2c85c09f629215d3a6ece942baa100950af03a34f733"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "456c603be3e8d448b072f410900c09faf164fbce2d480456f50eea6e25f9c848"
+
+[[package]]
+name = "rio-py"
+version = "3.3.2"
+dependencies = [
+ "lazy_static",
+ "pyo3",
+ "regex",
+]
+
+[[package]]
+name = "scopeguard"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
+
+[[package]]
+name = "smallvec"
+version = "1.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
+
+[[package]]
+name = "syn"
+version = "1.0.109"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "84a22b9f218b40614adcb3f4ff08b703773ad44fa9423e4e0d346d5db86e4ebc"
+
+[[package]]
+name = "unindent"
+version = "0.1.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e1766d682d402817b5ac4490b3c3002d91dfa0d22812f341609f97b08757359c"
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/pkgs/development/python-modules/breezy/default.nix b/pkgs/development/python-modules/breezy/default.nix
index c8104f1b2376..6d27908dd84f 100644
--- a/pkgs/development/python-modules/breezy/default.nix
+++ b/pkgs/development/python-modules/breezy/default.nix
@@ -1,57 +1,122 @@
 { lib
+, stdenv
 , buildPythonPackage
 , fetchPypi
 , configobj
-, patiencediff
+, cython
+, dulwich
 , fastbencode
 , fastimport
-, dulwich
+, libiconv
+, merge3
+, patiencediff
+, pyyaml
+, urllib3
+, breezy
 , launchpadlib
 , testtools
 , pythonOlder
 , installShellFiles
+, rustPlatform
+, setuptools-gettext
+, setuptools-rust
+, testers
 }:
 
 buildPythonPackage rec {
   pname = "breezy";
-  version = "3.2.2";
+  version = "3.3.2";
+  format = "pyproject";
 
   disabled = pythonOlder "3.5";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "sha256-GHpuRSCN0F2BdQc2cgyDcQz0gJT1R+xAgcVxJZVZpNU=";
+    sha256 = "sha256-TqaUn8uwdrl4VFsJn6xoq6011voYmd7vT2uCo9uiV8E=";
   };
 
-  nativeBuildInputs = [ installShellFiles ];
+  cargoDeps = rustPlatform.importCargoLock {
+    lockFile = ./Cargo.lock;
+  };
+
+  postPatch = ''
+    ln -s ${./Cargo.lock} Cargo.lock
+  '';
+
+  cargoHash = "sha256-xYZh/evNp036/wRlNWWUYeD2EkleM+OeY4qbYMCE00I=";
+
+  nativeBuildInputs = [
+    cython
+    installShellFiles
+    rustPlatform.cargoSetupHook
+    rustPlatform.rust.cargo
+    rustPlatform.rust.rustc
+    setuptools-gettext
+    setuptools-rust
+  ];
+
+  buildInputs = lib.optionals stdenv.isDarwin [ libiconv ];
 
   propagatedBuildInputs = [
     configobj
-    fastbencode
-    patiencediff
-    fastimport
     dulwich
-    launchpadlib
+    fastbencode
+    merge3
+    patiencediff
+    pyyaml
+    urllib3
+  ] ++ passthru.optional-dependencies.launchpad
+    ++ passthru.optional-dependencies.fastimport;
+
+  nativeCheckInputs = [
+    testtools
   ];
 
-  nativeCheckInputs = [ testtools ];
-
-  # There is a conflict with their `lazy_import` and plugin tests
+  # multiple failures on sandbox
   doCheck = false;
 
-  # symlink for bazaar compatibility
+  checkPhase = ''
+    runHook preCheck
+
+    HOME=$TMPDIR $out/bin/brz --no-plugins selftest
+
+    runHook postCheck
+  '';
+
   postInstall = ''
+    wrapProgram $out/bin/brz --prefix PYTHONPATH : "$PYTHONPATH"
+
+    # symlink for bazaar compatibility
     ln -s "$out/bin/brz" "$out/bin/bzr"
 
     installShellCompletion --cmd brz --bash contrib/bash/brz
   '';
 
-  pythonImportsCheck = [ "breezy" ];
+  pythonImportsCheck = [
+    "breezy"
+    "breezy.bzr.rio"
+  ];
+
+  passthru = {
+    tests.version = testers.testVersion {
+      package = breezy;
+      command = "HOME=$TMPDIR brz --version";
+    };
+    optional-dependencies = {
+      launchpad = [
+        launchpadlib
+      ];
+      fastimport = [
+        fastimport
+      ];
+    };
+  };
 
   meta = with lib; {
     description = "Friendly distributed version control system";
     homepage = "https://www.breezy-vcs.org/";
     license = licenses.gpl2Only;
     maintainers = [ maintainers.marsam ];
+    mainProgram = "brz";
   };
 }
diff --git a/pkgs/development/python-modules/merge3/default.nix b/pkgs/development/python-modules/merge3/default.nix
new file mode 100644
index 000000000000..e16a73eee3df
--- /dev/null
+++ b/pkgs/development/python-modules/merge3/default.nix
@@ -0,0 +1,35 @@
+{ lib
+, buildPythonPackage
+, pythonOlder
+, fetchPypi
+, setuptools
+}:
+
+buildPythonPackage rec {
+  pname = "merge3";
+  version = "0.0.13";
+
+  format = "pyproject";
+
+  disabled = pythonOlder "3.7";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "8abda1d2d49776323d23d09bfdd80d943a57d43d28d6152ffd2c87956a9b6b54";
+  };
+
+  nativeBuildInputs = [
+    setuptools
+  ];
+
+  pythonImportsCheck = [
+    "merge3"
+  ];
+
+  meta = with lib; {
+    description = "Python implementation of 3-way merge";
+    homepage = "https://github.com/breezy-team/merge3";
+    license = licenses.gpl2Plus;
+    maintainers = with maintainers; [ marsam ];
+  };
+}
diff --git a/pkgs/development/python-modules/setuptools-gettext/default.nix b/pkgs/development/python-modules/setuptools-gettext/default.nix
index f8b5d45bbc7f..882eb6d4599b 100644
--- a/pkgs/development/python-modules/setuptools-gettext/default.nix
+++ b/pkgs/development/python-modules/setuptools-gettext/default.nix
@@ -7,7 +7,7 @@
 
 buildPythonPackage rec {
   pname = "setuptools-gettext";
-  version = "0.1.1";
+  version = "0.1.3";
   format = "setuptools";
 
   disabled = pythonOlder "3.7";
@@ -16,7 +16,7 @@ buildPythonPackage rec {
     owner = "breezy-team";
     repo = "setuptools-gettext";
     rev = "refs/tags/v${version}";
-    hash = "sha256-MifsEuWNTEDJa9RfIbM/EDMJg0cmHXX6oJxNskKEbY4=";
+    hash = "sha256-pTjYdezNBFeLCh6cbC+YtHxQB4zrZAFTCjjNQffbHhc=";
   };
 
   propagatedBuildInputs = [
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index cef51d98405e..259f5de93347 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -5870,6 +5870,8 @@ self: super: with self; {
     python3Packages = self;
   });
 
+  merge3 = callPackage ../development/python-modules/merge3 { };
+
   mergedb = callPackage ../development/python-modules/mergedb { };
 
   mergedeep = callPackage ../development/python-modules/mergedeep { };