Checklist
What happened?
The fmt feedstock in conda-forge has a downstream test to ensure mamba keeps working;
test:
commands:
- [...]
downstreams:
- libmambapyIn conda-forge/fmt-feedstock#72, with conda-build 26.7, I'm getting the error
TEST START: /home/conda/feedstock_root/build_artifacts/pkg_cache/libmambapy-2.8.1-py314hd8b5600_0.conda
WARNING: Copying package to conda-build croot. No packages otherwise alongside yours will be available unless you specify -c local. To avoid this warning, your package must reside in a channel structure with platform-subfolders. See more info on what a valid channel is at https://conda.io/docs/user-guide/tasks/create-custom-channels.html
Traceback (most recent call last):
File "/opt/conda/lib/python3.12/site-packages/conda_build/render.py", line 1082, in render_recipe
m = MetaData(str(recipe), config=config)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/conda/lib/python3.12/site-packages/conda_build/metadata.py", line 1215, in __init__
self._meta_path = find_recipe(path)
^^^^^^^^^^^^^^^^^
File "/opt/conda/lib/python3.12/site-packages/conda_build/utils.py", line 1339, in find_recipe
raise OSError(
OSError: No meta files (meta.yaml, meta.yml, conda.yaml, conda.yml) found in /tmp/tmpaily2afa/info/recipe
Going back to conda-build 26.5 makes the recipe passing again
Conda Info
Details
++ conda info
active environment : base
active env location : /opt/conda
shell level : 1
user config file : /home/conda/.condarc
populated config files : /opt/conda/.condarc
/opt/conda/condarc.d/anaconda-auth.yml
/home/conda/.condarc
conda version : 26.7.0
conda-build version : 26.5.0
python version : 3.12.13.final.0
solver : libmamba (default)
virtual packages : __archspec=1=icelake
__conda=26.7.0=0
__glibc=2.39=0
__linux=6.17.0=0
__unix=0=0
base environment : /opt/conda (writable)
conda av data dir : /opt/conda/etc/conda
conda av metadata url : None
channel URLs : https://conda.anaconda.org/conda-forge/linux-64
https://conda.anaconda.org/conda-forge/noarch
package cache : /home/conda/feedstock_root/build_artifacts/pkg_cache
/opt/conda/pkgs
notices cache : /home/conda/.cache/conda/notices
envs directories : /opt/conda/envs
/home/conda/.conda/envs
temporary directory : /tmp
platform : linux-64
user-agent : conda/26.7.0 requests/2.34.2 CPython/3.12.13 Linux/6.17.0-1020-azure almalinux/10.2 glibc/2.39 solver/libmamba conda-libmamba-solver/26.7.0 libmambapy/2.8.1
UID:GID : 1001:1001
netrc file : None
offline mode : FalseConda Config
Details
++ conda config --env --show-sources
==> /opt/conda/.condarc <==
add_pip_as_python_dependency: False
auto_update_conda: False
aggressive_update_packages:
- ca-certificates
- certifi
channel_priority: strict
channels:
- conda-forge
show_channel_urls: True
conda_build:
pkg_format: 2
zstd_compression_level: 19
==> /opt/conda/condarc.d/anaconda-auth.yml <==
channel_settings:
- channel: https://repo.anaconda.cloud/*
auth: anaconda-auth
==> /home/conda/.condarc <==
pkgs_dirs:
- /home/conda/feedstock_root/build_artifacts/pkg_cache
- /opt/conda/pkgs
solver: libmamba
conda-build:
root-dir: /home/conda/feedstock_root/build_artifacts
==> envvars <==
allow_softlinks: False
bld_path: /home/conda/feedstock_root/build_artifactsConda list
Details
++ conda list --show-channel-urls
# packages in environment at /opt/conda:
#
# Name Version Build Channel
_libgcc_mutex 0.1 conda_forge conda-forge
_openmp_mutex 4.5 20_gnu conda-forge
_python_abi3_support 1.0 hd8ed1ab_3 conda-forge
anaconda-auth 0.15.1 pyhd8ed1ab_0 conda-forge
anaconda-cli-base 0.8.2 pyhc364b38_0 conda-forge
anaconda-client 1.14.1 pyhcf101f3_0 conda-forge
annotated-doc 0.0.5 pyhcf101f3_0 conda-forge
annotated-types 0.8.0 pyhd8ed1ab_0 conda-forge
anyio 4.14.2 pyhcf101f3_0 conda-forge
archspec 0.2.5 pyhd8ed1ab_0 conda-forge
attrs 26.1.0 pyhcf101f3_0 conda-forge
backports 1.0 pyhd8ed1ab_5 conda-forge
backports.tarfile 1.2.0 pyhcf101f3_2 conda-forge
backports.zstd 1.6.0 py312h90b7ffd_0 conda-forge
beautifulsoup4 4.15.0 pyha770c72_0 conda-forge
boltons 26.1.0 pyhd8ed1ab_0 conda-forge
brotli-python 1.2.0 py312hdb49522_1 conda-forge
bzip2 1.0.8 hda65f42_10 conda-forge
c-ares 1.34.8 hb03c661_0 conda-forge
ca-certificates 2026.7.22 hbd8a1cb_0 conda-forge
cached-property 1.5.2 hd8ed1ab_2 conda-forge
cached_property 1.5.2 pyha770c72_2 conda-forge
certifi 2026.7.22 pyhd8ed1ab_0 conda-forge
cffi 2.1.1 py312h460c074_0 conda-forge
chardet 7.4.3 pyhcf101f3_0 conda-forge
charset-normalizer 3.4.9 pyhd8ed1ab_0 conda-forge
click 8.4.2 pyhc90fa1f_0 conda-forge
colorama 0.4.6 pyhd8ed1ab_1 conda-forge
conda 26.7.0 py312h20c3967_0 conda-forge
conda-build 26.5.0 pyh31ec981_0 conda-forge
conda-env 2.6.0 1 conda-forge
conda-forge-ci-setup 4.26.1 py312hef7310e_100 conda-forge
conda-forge-metadata 0.16.1 pyhcf101f3_0 conda-forge
conda-index 0.12.1 pyhd8ed1ab_0 conda-forge
conda-libmamba-solver 26.7.0 pyhcf101f3_0 conda-forge
conda-lockfiles 0.2.1 pyhd8ed1ab_0 conda-forge
conda-oci-mirror 0.2.3 pyhd8ed1ab_1 conda-forge
conda-package-handling 2.5.0 pyhcf101f3_0 conda-forge
conda-package-streaming 0.13.0 pyhd8ed1ab_0 conda-forge
conda-pypi 0.11.0 py312h20c3967_1 conda-forge
conda-rattler-solver 0.1.1 pyhcf101f3_0 conda-forge
conda-self 0.2.1 pyhd8ed1ab_0 conda-forge
cpp-expected 1.3.1 h171cf75_0 conda-forge
cpython 3.12.13 py312hd8ed1ab_0 conda-forge
cryptography 50.0.0 py312ha4b625e_0 conda-forge
dbus 1.16.2 h24cb091_1 conda-forge
defusedxml 0.7.1 pyhd8ed1ab_0 conda-forge
deprecated 1.3.1 pyhd8ed1ab_1 conda-forge
distro 1.9.0 pyhd8ed1ab_1 conda-forge
evalidate 2.0.5 pyhe01879c_0 conda-forge
exceptiongroup 1.3.1 pyhd8ed1ab_0 conda-forge
filelock 3.32.2 pyhd8ed1ab_0 conda-forge
fmt 12.1.0 hff5e90c_0 conda-forge
frozendict 2.4.7 pyh851646a_2 conda-forge
git 2.55.0 pl5321h5685339_1 conda-forge
h11 0.16.0 pyhcf101f3_1 conda-forge
h2 4.4.1 pyhcf101f3_0 conda-forge
hpack 4.2.0 pyhd8ed1ab_0 conda-forge
httpcore 1.0.9 pyh29332c3_0 conda-forge
httpx 0.28.1 pyhd8ed1ab_0 conda-forge
hyperframe 6.1.0 pyhd8ed1ab_0 conda-forge
icu 78.3 h54a6638_2 conda-forge
idna 3.18 pyhcf101f3_0 conda-forge
importlib-metadata 9.0.0 pyhcf101f3_0 conda-forge
importlib_resources 7.1.0 pyhd8ed1ab_0 conda-forge
jaraco.classes 3.4.0 pyhcf101f3_3 conda-forge
jaraco.context 6.1.2 pyhcf101f3_0 conda-forge
jaraco.functools 4.6.0 pyhcf101f3_0 conda-forge
jeepney 0.9.0 pyhd8ed1ab_0 conda-forge
jinja2 3.1.6 pyhcf101f3_1 conda-forge
joblib 1.5.3 pyhd8ed1ab_0 conda-forge
jq 1.8.2 h280c20c_0 conda-forge
jsonpatch 1.33 pyhd8ed1ab_1 conda-forge
jsonpointer 3.1.1 pyhcf101f3_0 conda-forge
jsonschema 4.26.0 pyhcf101f3_0 conda-forge
jsonschema-specifications 2025.9.1 pyhcf101f3_0 conda-forge
jupyter_core 5.9.1 pyhc90fa1f_0 conda-forge
keyring 25.7.0 pyha804496_0 conda-forge
keyutils 1.6.3 hb9d3cd8_0 conda-forge
krb5 1.22.2 hbde042b_1 conda-forge
lcms2 2.19.1 h0c24ade_1 conda-forge
ld_impl_linux-64 2.46.1 default_hbd61a6d_102 conda-forge
lerc 4.2.0 hdb68285_0 conda-forge
libarchive 3.8.9 gpl_hc2c16d8_100 conda-forge
libcurl 8.21.0 heca4667_4 conda-forge
libdeflate 1.25 h17f619e_0 conda-forge
libedit 3.1.20250104 pl5321h7949ede_0 conda-forge
libev 4.33 hd590300_2 conda-forge
libexpat 2.8.1 hecca717_1 conda-forge
libffi 3.5.2 h3435931_0 conda-forge
libfreetype 2.14.3 ha770c72_1 conda-forge
libfreetype6 2.14.3 h73754d4_1 conda-forge
libgcc 16.1.0 ha9f2e26_1 conda-forge
libgcc-ng 16.1.0 h69a702a_1 conda-forge
libglib 2.88.3 h0d30a3d_0 conda-forge
libgomp 16.1.0 he0feb66_1 conda-forge
libiconv 1.18 h3b78370_2 conda-forge
libjpeg-turbo 3.2.0 hb03c661_1 conda-forge
liblief 0.17.6 hecca717_0 conda-forge
liblzma 5.8.3 hb03c661_0 conda-forge
liblzma-devel 5.8.3 hb03c661_0 conda-forge
libmamba 2.8.1 hd28c85e_0 conda-forge
libmamba-spdlog 2.8.1 h9b73f26_0 conda-forge
libmambapy 2.8.1 py312h1025cc7_0 conda-forge
libmsgpack-c 6.1.0 h54a6638_6 conda-forge
libnghttp2 1.68.1 h877daf1_0 conda-forge
libnsl 2.0.1 hb9d3cd8_1 conda-forge
libpng 1.6.58 h421ea60_0 conda-forge
libpsl 0.23.0 hf670292_0 conda-forge
libsodium 1.0.22 h280c20c_1 conda-forge
libsolv 0.7.39 h9463b59_0 conda-forge
libsqlite 3.53.4 hf4e2dac_0 conda-forge
libssh2 1.11.1 hcf80075_0 conda-forge
libstdcxx 16.1.0 h934c35e_1 conda-forge
libstdcxx-ng 16.1.0 hdf11a46_1 conda-forge
libtiff 4.7.2 h9d88235_0 conda-forge
libuuid 2.42.2 h5347b49_0 conda-forge
libwebp-base 1.6.0 hd42ef1d_0 conda-forge
libxcb 1.17.0 h8a09558_0 conda-forge
libxcrypt 4.4.38 h280c20c_0 conda-forge
libxml2 2.15.3 h49c6c72_0 conda-forge
libxml2-16 2.15.3 hca6bf5a_0 conda-forge
libzlib 1.3.2 h25fd6f3_3 conda-forge
lz4-c 1.10.0 h5888daf_1 conda-forge
lzo 2.10 h280c20c_1002 conda-forge
mamba 2.8.1 h73a5c8a_0 conda-forge
markdown-it-py 4.2.0 pyhd8ed1ab_0 conda-forge
markupsafe 3.0.3 py312h8a5da7c_1 conda-forge
mbedtls 3.6.3.1 h5888daf_0 conda-forge
mdurl 0.1.2 pyhd8ed1ab_1 conda-forge
menuinst 2.5.2 py312h20c3967_0 conda-forge
more-itertools 11.1.0 pyhcf101f3_0 conda-forge
msgpack-python 1.2.1 py312h0a2e395_1 conda-forge
nbformat 5.10.4 pyhd8ed1ab_1 conda-forge
ncurses 6.6 hdb14827_0 conda-forge
nlohmann_json-abi 3.12.0 h0f90c79_1 conda-forge
oniguruma 6.9.10 hb9d3cd8_0 conda-forge
openjpeg 2.5.4 h55fea9a_0 conda-forge
openssl 3.6.3 h35e630c_0 conda-forge
oras-py 0.1.14 pyhd8ed1ab_0 conda-forge
packaging 26.3 pyhc364b38_0 conda-forge
patch 2.8 hb03c661_1002 conda-forge
patchelf 0.17.2 h58526e2_0 conda-forge
pcre2 10.47 haa7fec5_0 conda-forge
perl 5.32.1 7_hd590300_perl5 conda-forge
pillow 12.3.0 py312h50c33e8_0 conda-forge
pip 26.2 pyh8b19718_0 conda-forge
pixi 0.76.1 ha759004_0 conda-forge
pkce 1.0.3 pyhd8ed1ab_1 conda-forge
pkginfo 1.12.1.2 pyhd8ed1ab_0 conda-forge
platformdirs 4.11.0 pyhcf101f3_0 conda-forge
pluggy 1.6.0 pyhf9edf01_1 conda-forge
psutil 7.2.2 py312h5253ce2_0 conda-forge
pthread-stubs 0.4 hb9d3cd8_1002 conda-forge
py-lief 0.17.6 py312h1289d80_0 conda-forge
py-rattler 0.25.0 py310h70157a2_2 conda-forge
py-rattler-build 0.72.2 py310hb823017_0 conda-forge
pybind11-abi 11 hc364b38_1 conda-forge
pycosat 0.6.6 py312h4c3975b_4 conda-forge
pycparser 3.0 pyhcf101f3_0 conda-forge
pydantic 2.13.4 pyhcf101f3_0 conda-forge
pydantic-core 2.46.4 py312h868fb18_0 conda-forge
pydantic-settings 2.14.2 pyhcf101f3_0 conda-forge
pygithub 2.9.1 pyhd8ed1ab_0 conda-forge
pygments 2.20.0 pyhd8ed1ab_0 conda-forge
pyjwt 2.13.0 pyhcf101f3_0 conda-forge
pynacl 1.6.2 py312hf34ed73_3 conda-forge
pyproject_hooks 1.2.0 pyhd8ed1ab_1 conda-forge
pysocks 1.7.1 pyha55dd90_7 conda-forge
python 3.12.13 hd63d673_0_cpython conda-forge
python-build 1.5.0 pyhc364b38_0 conda-forge
python-dateutil 2.9.0.post0 pyhe01879c_2 conda-forge
python-dotenv 1.2.2 pyhcf101f3_0 conda-forge
python-fastjsonschema 2.22.1 pyhcf101f3_0 conda-forge
python-gil 3.12.13 hd8ed1ab_0 conda-forge
python-installer 1.0.1 pyh332efcf_0 conda-forge
python-libarchive-c 5.3 pyhe01879c_1 conda-forge
python_abi 3.12 8_cp312 conda-forge
pytz 2026.3.post1 pyhcf101f3_0 conda-forge
pyyaml 6.0.3 py312h8a5da7c_1 conda-forge
rattler-build 0.72.2 ha759004_0 conda-forge
rattler-build-conda-compat 1.4.18 pyhd8ed1ab_0 conda-forge
readchar 4.2.2 pyhcf101f3_0 conda-forge
readline 8.3 h853b02a_0 conda-forge
referencing 0.37.0 pyhcf101f3_0 conda-forge
reproc 14.2.7.post0 hb03c661_1 conda-forge
reproc-cpp 14.2.7.post0 hecca717_1 conda-forge
requests 2.34.2 pyhcf101f3_0 conda-forge
requests-toolbelt 1.0.0 pyhd8ed1ab_1 conda-forge
rich 15.0.0 pyhcf101f3_0 conda-forge
ripgrep 15.2.0 hdab8a38_0 conda-forge
rpds-py 2026.6.3 py312h192e038_0 conda-forge
ruamel.yaml 0.18.17 py312h5253ce2_2 conda-forge
ruamel.yaml.clib 0.2.15 py312h5253ce2_1 conda-forge
secretstorage 3.5.0 py312h7900ff3_0 conda-forge
semver 3.0.4 pyhcf101f3_1 conda-forge
setuptools 83.0.0 pyh332efcf_0 conda-forge
shellingham 1.5.4 pyhd8ed1ab_2 conda-forge
shyaml 0.6.2 pyhd3deb0d_0 conda-forge
simdjson 4.6.6 hb700be7_0 conda-forge
six 1.17.0 pyhe01879c_1 conda-forge
sniffio 1.3.1 pyhd8ed1ab_2 conda-forge
soupsieve 2.9.1 pyhd8ed1ab_0 conda-forge
spdlog 1.17.0 hab81395_1 conda-forge
su-exec 0.2 h166bdaf_1003 conda-forge
tini 0.19.0 h166bdaf_1 conda-forge
tk 8.6.13 noxft_hd70dff1_3 conda-forge
tomli 2.4.1 pyhcf101f3_0 conda-forge
tomli-w 1.2.0 pyhd8ed1ab_0 conda-forge
tomlkit 0.15.1 pyhcf101f3_0 conda-forge
tqdm 4.70.0 pyh8f84b5b_0 conda-forge
traitlets 5.16.1 pyhcf101f3_0 conda-forge
truststore 0.10.4 pyhcf101f3_0 conda-forge
typer 0.27.1 pyhcf101f3_0 conda-forge
typing-extensions 4.16.0 h69aa097_0 conda-forge
typing-inspection 0.4.2 pyhcf101f3_2 conda-forge
typing_extensions 4.16.0 pyhcf101f3_0 conda-forge
tzdata 2026c h151e31d_0 conda-forge
unearth 0.18.2 pyhd8ed1ab_0 conda-forge
urllib3 2.7.0 pyhd8ed1ab_0 conda-forge
wheel 0.47.0 pyhd8ed1ab_0 conda-forge
wrapt 2.3.0 py312h4c3975b_0 conda-forge
xorg-libxau 1.0.12 hb03c661_1 conda-forge
xorg-libxdmcp 1.1.5 hb03c661_1 conda-forge
xz 5.8.3 ha02ee65_0 conda-forge
xz-gpl-tools 5.8.3 ha02ee65_0 conda-forge
xz-tools 5.8.3 hb03c661_0 conda-forge
yaml 0.2.5 h280c20c_3 conda-forge
yaml-cpp 0.8.0 h59595ed_0 conda-forge
zipp 4.1.0 pyhcf101f3_0 conda-forge
zlib-ng 2.3.3 hceb46e0_1 conda-forge
zstandard 0.25.0 py312h5253ce2_1 conda-forge
zstd 1.5.7 hb78ec9c_6 conda-forge
Additional Context
Happens on all platforms (which already have a libmamba build compatible with fmt 12.1; the riscv build passed, because it doesn't).
Checklist
What happened?
The fmt feedstock in conda-forge has a downstream test to ensure mamba keeps working;
In conda-forge/fmt-feedstock#72, with conda-build 26.7, I'm getting the error
Going back to conda-build 26.5 makes the recipe passing again
Conda Info
Details
++ conda info active environment : base active env location : /opt/conda shell level : 1 user config file : /home/conda/.condarc populated config files : /opt/conda/.condarc /opt/conda/condarc.d/anaconda-auth.yml /home/conda/.condarc conda version : 26.7.0 conda-build version : 26.5.0 python version : 3.12.13.final.0 solver : libmamba (default) virtual packages : __archspec=1=icelake __conda=26.7.0=0 __glibc=2.39=0 __linux=6.17.0=0 __unix=0=0 base environment : /opt/conda (writable) conda av data dir : /opt/conda/etc/conda conda av metadata url : None channel URLs : https://conda.anaconda.org/conda-forge/linux-64 https://conda.anaconda.org/conda-forge/noarch package cache : /home/conda/feedstock_root/build_artifacts/pkg_cache /opt/conda/pkgs notices cache : /home/conda/.cache/conda/notices envs directories : /opt/conda/envs /home/conda/.conda/envs temporary directory : /tmp platform : linux-64 user-agent : conda/26.7.0 requests/2.34.2 CPython/3.12.13 Linux/6.17.0-1020-azure almalinux/10.2 glibc/2.39 solver/libmamba conda-libmamba-solver/26.7.0 libmambapy/2.8.1 UID:GID : 1001:1001 netrc file : None offline mode : FalseConda Config
Details
Conda list
Details
Additional Context
Happens on all platforms (which already have a libmamba build compatible with fmt 12.1; the riscv build passed, because it doesn't).