v2.5.0 mamba installation fails

[thawn]

Trying to install xmlschema-2.5.0 with mamba fails with the following error

critical libmamba Pathname can't be converted from UTF-8 to current locale.
libmamba Error opening for reading "/minimamba/pkgs/xmlschema-2.5.0-pyhd8ed1ab_0/info/index.json": No such file or directory

my locale is en_US.UTF-8
OS: Ubuntu 20.04 (in a singularity container)

version 2.3.0 installed without errors in the same container.

full mamba error message

critical libmamba Pathname can't be converted from UTF-8 to current locale.
error    libmamba Error opening for reading "/minimamba/pkgs/xmlschema-2.5.0-pyhd8ed1ab_0/info/index.json": No such file or directory
error    libmamba Error when extracting package: [json.exception.parse_error.101] parse error at line 1, column 1: syntax error while parsing value - unexpected end of input; expected '[', '{', or a literal
xmlschema-2.5.0-pyhd8ed1ab_0.conda extraction failed
# >>>>>>>>>>>>>>>>>>>>>> ERROR REPORT <<<<<<<<<<<<<<<<<<<<<<
    Traceback (most recent call last):
      File "/minimamba/lib/python3.9/site-packages/conda/exceptions.py", line 1082, in __call__
        return func(*args, **kwargs)
      File "/minimamba/lib/python3.9/site-packages/conda_env/cli/main.py", line 80, in do_call
        exit_code = getattr(module, func_name)(args, parser)
      File "/minimamba/lib/python3.9/site-packages/conda_env/cli/main_create.py", line 142, in execute
        result[installer_type] = installer.install(prefix, pkg_specs, args, env)
      File "/minimamba/lib/python3.9/site-packages/mamba/mamba_env.py", line 148, in mamba_install
        transaction.fetch_extract_packages()
    RuntimeError: Found incorrect download: xmlschema. Aborting
`$ /minimamba/bin//mamba create -p /app/env -f /environment.yml`
  environment variables:
                 CIO_TEST=
  CONDA_AUTO_UPDATE_CONDA=false
               CONDA_ROOT=/minimamba
           CURL_CA_BUNDLE=
          LD_LIBRARY_PATH=/usr/local/nvidia/lib:/usr/local/nvidia/lib64:/.singularity.d/libs
                     PATH=/minimamba/bin/:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbi
                          n:/bin
       REQUESTS_CA_BUNDLE=
            SSL_CERT_FILE=
     active environment : None
       user config file : /root/.condarc
 populated config files : /minimamba/.condarc
          conda version : 4.12.0
    conda-build version : not installed
         python version : 3.9.13.final.0
       virtual packages : __linux=5.10.0=0
                          __glibc=2.31=0
                          __unix=0=0
                          __archspec=1=x86_64
       base environment : /minimamba  (writable)
      conda av data dir : /minimamba/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 : /minimamba/pkgs
                          /root/.conda/pkgs
       envs directories : /minimamba/envs
                          /root/.conda/envs
               platform : linux-64
             user-agent : conda/4.12.0 requests/2.27.1 CPython/3.9.13 Linux/5.10.0-23-amd64 ubuntu/20.04.6 glibc/2.31
                UID:GID : 0:0
             netrc file : None
           offline mode : False

[brunato]

Hi,

seems to be a packaging issue for (mini)mamba (info/index.json is a missing file that not belongs to xmlschema source package and i don't find a reason related to xmlschema source in the error message).

I'll try to reproduce in a similar installation but my advice is to report this also to mamba maintainers.