With latest conda-forge repodata, install both boost and gazebo results in pypy being installed, differently from conda

[traversaro]

With the latest conda-forge data, mamba and conda are giving a different resolution when trying to install both boost and gazebo. In particular, mamba tries to install pypy, that typically it is not a great choice as default Python unless the user explicitly asked for it.

(test) root@4442114f7f41:/# mamba install boost gazebo

                  __    __    __    __
                 /  \  /  \  /  \  /  \
                /    \/    \/    \/    \
███████████████/  /██/  /██/  /██/  /████████████████████████
              /  / \   / \   / \   / \  \____
             /  /   \_/   \_/   \_/   \    o \__,
            / _/                       \_____/  `
            |/
        ███╗   ███╗ █████╗ ███╗   ███╗██████╗  █████╗
        ████╗ ████║██╔══██╗████╗ ████║██╔══██╗██╔══██╗
        ██╔████╔██║███████║██╔████╔██║██████╔╝███████║
        ██║╚██╔╝██║██╔══██║██║╚██╔╝██║██╔══██╗██╔══██║
        ██║ ╚═╝ ██║██║  ██║██║ ╚═╝ ██║██████╔╝██║  ██║
        ╚═╝     ╚═╝╚═╝  ╚═╝╚═╝     ╚═╝╚═════╝ ╚═╝  ╚═╝

        mamba (0.13.0) supported by @QuantStack

        GitHub:  https://github.com/mamba-org/mamba
        Twitter: https://twitter.com/QuantStack

█████████████████████████████████████████████████████████████


Looking for: ['boost', 'gazebo']

conda-forge/linux-64     [====================] (00m:00s) No change
conda-forge/noarch       [====================] (00m:03s) Done
Transaction

  Prefix: /root/miniforge3/envs/test

  Updating specs:

   - boost
   - gazebo


  Package                         Version  Build                Channel                    Size
─────────────────────────────────────────────────────────────────────────────────────────────────
  Install:
─────────────────────────────────────────────────────────────────────────────────────────────────

  _libgcc_mutex                       0.1  conda_forge          conda-forge/linux-64     Cached
  _openmp_mutex                       4.5  1_gnu                conda-forge/linux-64     Cached
  alsa-lib                          1.2.3  h516909a_0           conda-forge/linux-64     Cached
  boost                            1.74.0  py36hb4f4ce5_3       conda-forge/linux-64     364 KB
  boost-cpp                        1.74.0  hc6e9bd1_3           conda-forge/linux-64     Cached
  bzip2                             1.0.8  h7f98852_4           conda-forge/linux-64     Cached
  c-ares                           1.17.1  h7f98852_1           conda-forge/linux-64     Cached
  ca-certificates               2021.5.30  ha878542_0           conda-forge/linux-64     Cached
  certifi                       2021.5.30  py36hd000896_0       conda-forge/linux-64     141 KB
  console_bridge                    1.0.1  hc9558a2_0           conda-forge/linux-64     Cached
  cppzmq                            4.7.1  hf7cf922_2           conda-forge/linux-64     Cached
  curl                             7.77.0  hea6ffbf_0           conda-forge/linux-64     Cached
  dbus                             1.13.6  h48d8840_2           conda-forge/linux-64     Cached
  eigen                             3.3.9  h4bd325d_1           conda-forge/linux-64     Cached
  expat                             2.4.1  h9c3ff4c_0           conda-forge/linux-64     Cached
  ffmpeg                            4.3.1  h03821db_2           conda-forge/linux-64      92 MB
  fontconfig                       2.13.1  hba837de_1005        conda-forge/linux-64     Cached
  freeimage                        3.18.0  hadfbfc9_7           conda-forge/linux-64     477 KB
  freetype                         2.10.4  h0708190_1           conda-forge/linux-64     Cached
  gazebo                           11.5.0  h5fc56bc_1           conda-forge/linux-64      63 MB
  gdbm                               1.18  h0a1914f_2           conda-forge/linux-64     Cached
  gettext                        0.19.8.1  h0b5b191_1005        conda-forge/linux-64     Cached
  glib                             2.68.2  h9c3ff4c_2           conda-forge/linux-64     Cached
  glib-tools                       2.68.2  h9c3ff4c_2           conda-forge/linux-64     Cached
  gmp                               6.2.1  h58526e2_0           conda-forge/linux-64     Cached
  gnutls                           3.6.13  h85f3911_1           conda-forge/linux-64     Cached
  gst-plugins-base                 1.18.4  hf529b03_2           conda-forge/linux-64     Cached
  gstreamer                        1.18.4  h76c114f_2           conda-forge/linux-64     Cached
  gts                               0.7.6  h1fc3fae_2           conda-forge/linux-64     388 KB
  icu                                68.1  h58526e2_0           conda-forge/linux-64     Cached
  ilmbase                           2.5.5  h780b84a_0           conda-forge/linux-64     Cached
  jpeg                                 9d  h516909a_0           conda-forge/linux-64     Cached
  jsoncpp                           1.9.4  h4bd325d_2           conda-forge/linux-64     Cached
  jxrlib                              1.1  h516909a_2           conda-forge/linux-64     Cached
  krb5                             1.19.1  hcc1bbae_0           conda-forge/linux-64     Cached
  lame                              3.100  h14c3975_1001        conda-forge/linux-64     498 KB
  lcms2                              2.12  hddcbb42_0           conda-forge/linux-64     Cached
  libblas                           3.9.0  9_openblas           conda-forge/linux-64     Cached
  libcblas                          3.9.0  9_openblas           conda-forge/linux-64     Cached
  libccd                              2.1  he1b5a44_1           conda-forge/linux-64      33 KB
  libclang                         11.1.0  default_ha53f305_1   conda-forge/linux-64     Cached
  libcurl                          7.77.0  h2574ce0_0           conda-forge/linux-64     Cached
  libedit                    3.1.20191231  h46ee950_2           conda-forge/linux-64     Cached
  libev                              4.33  h516909a_1           conda-forge/linux-64     Cached
  libevent                         2.1.10  hcdb4288_3           conda-forge/linux-64     Cached
  libffi                              3.3  h58526e2_2           conda-forge/linux-64     Cached
  libgcc-ng                         9.3.0  h2828fa1_19          conda-forge/linux-64     Cached
  libgfortran-ng                    9.3.0  hff62375_19          conda-forge/linux-64     Cached
  libgfortran5                      9.3.0  hff62375_19          conda-forge/linux-64     Cached
  libglib                          2.68.2  h3e27bee_2           conda-forge/linux-64     Cached
  libglu                            9.0.0  he1b5a44_1001        conda-forge/linux-64     Cached
  libgomp                           9.3.0  h2828fa1_19          conda-forge/linux-64     Cached
  libiconv                           1.16  h516909a_0           conda-forge/linux-64     Cached
  libignition-cmake2                2.8.0  h9c3ff4c_0           conda-forge/linux-64     Cached
  libignition-common3              3.11.1  h4b9f6df_0           conda-forge/linux-64     Cached
  libignition-fuel-tools4           4.3.0  hf08c594_2           conda-forge/linux-64     Cached
  libignition-math6                 6.8.0  h9c3ff4c_0           conda-forge/linux-64     Cached
  libignition-msgs5                 5.3.0  hc438e01_6           conda-forge/linux-64     Cached
  libignition-tools1                1.2.0  h33ecc0d_0           conda-forge/linux-64       8 KB
  libignition-transport8            8.1.0  h3ef4182_6           conda-forge/linux-64     Cached
  liblapack                         3.9.0  9_openblas           conda-forge/linux-64     Cached
  libllvm11                        11.1.0  hf817b99_2           conda-forge/linux-64     Cached
  libnghttp2                       1.43.0  h812cca2_0           conda-forge/linux-64     Cached
  libogg                            1.3.4  h7f98852_1           conda-forge/linux-64     Cached
  libopenblas                      0.3.15  pthreads_h8fe5266_1  conda-forge/linux-64     Cached
  libopus                           1.3.1  h7f98852_1           conda-forge/linux-64     Cached
  libpng                           1.6.37  hed695b0_2           conda-forge/linux-64     Cached
  libpq                              13.3  hd57d9b9_0           conda-forge/linux-64     Cached
  libprotobuf                      3.15.8  h780b84a_0           conda-forge/linux-64     Cached
  libraw                           0.20.2  h10796ff_1           conda-forge/linux-64     Cached
  libsdformat                       9.3.0  hf765594_3           conda-forge/linux-64     677 KB
  libsodium                        1.0.18  h516909a_1           conda-forge/linux-64     366 KB
  libssh2                           1.9.0  ha56f1ee_6           conda-forge/linux-64     Cached
  libstdcxx-ng                      9.3.0  h6de172a_19          conda-forge/linux-64     Cached
  libtar                           1.2.20  h7f98852_1002        conda-forge/linux-64     Cached
  libtiff                           4.2.0  hbd63e13_2           conda-forge/linux-64     Cached
  libuuid                          2.32.1  h14c3975_1000        conda-forge/linux-64     Cached
  libvorbis                         1.3.7  he1b5a44_0           conda-forge/linux-64     287 KB
  libwebp-base                      1.2.0  h7f98852_2           conda-forge/linux-64     Cached
  libxcb                             1.13  h7f98852_1003        conda-forge/linux-64     Cached
  libxkbcommon                      1.0.3  he3ba5ed_0           conda-forge/linux-64     Cached
  libxml2                          2.9.12  h72842e0_0           conda-forge/linux-64     Cached
  libzip                            1.7.3  he9f05b3_0           conda-forge/linux-64     120 KB
  lz4-c                             1.9.3  h9c3ff4c_0           conda-forge/linux-64     Cached
  mysql-common                     8.0.23  ha770c72_2           conda-forge/linux-64     Cached
  mysql-libs                       8.0.23  h935591d_2           conda-forge/linux-64     Cached
  ncurses                             6.2  h58526e2_4           conda-forge/linux-64     Cached
  nettle                              3.6  he412f7d_0           conda-forge/linux-64     Cached
  nspr                               4.30  h9c3ff4c_0           conda-forge/linux-64     Cached
  nss                                3.66  hb5efdd6_0           conda-forge/linux-64     Cached
  numpy                            1.19.5  py36h7e87304_1       conda-forge/linux-64       5 MB
  ogre                            1.10.12  hf655ca9_7           conda-forge/linux-64     Cached
  openexr                           2.5.5  hf817b99_0           conda-forge/linux-64     Cached
  openh264                          2.1.1  h8b12597_0           conda-forge/linux-64       1 MB
  openjpeg                          2.4.0  hb52868f_1           conda-forge/linux-64     Cached
  openssl                          1.1.1k  h7f98852_0           conda-forge/linux-64     Cached
  pcre                               8.44  he1b5a44_0           conda-forge/linux-64     Cached
  pip                              21.1.2  pyhd8ed1ab_0         conda-forge/noarch       Cached
  protobuf                         3.15.8  py36ha03b18c_0       conda-forge/linux-64     352 KB
  pthread-stubs                       0.4  h14c3975_1001        conda-forge/linux-64     Cached
  pugixml                          1.11.4  h9c3ff4c_0           conda-forge/linux-64     Cached
  pypy3.6                           7.3.3  he1ebe50_3           conda-forge/linux-64      31 MB
  python                           3.6.12  4_73_pypy            conda-forge/linux-64       5 KB
  python_abi                          3.6  1_pypy36_pp73        conda-forge/linux-64       4 KB
  qt                               5.12.9  hda022c4_4           conda-forge/linux-64     Cached
  qwt                               6.1.6  h7ec6b3e_0           conda-forge/linux-64     Cached
  readline                            8.1  h46c0cb4_0           conda-forge/linux-64     Cached
  ruby                              2.7.2  he592edb_3           conda-forge/linux-64     Cached
  sdl2                             2.0.12  h58526e2_1           conda-forge/linux-64       1 MB
  setuptools                       49.6.0  py36hd000896_3       conda-forge/linux-64     901 KB
  six                              1.16.0  pyh6c4a22f_0         conda-forge/noarch       Cached
  sqlite                           3.35.5  h74cdb3f_0           conda-forge/linux-64     Cached
  swig                              4.0.2  hd3c618e_2           conda-forge/linux-64     Cached
  tbb                              2020.2  h4bd325d_4           conda-forge/linux-64     Cached
  tbb-devel                        2020.2  h4bd325d_4           conda-forge/linux-64     Cached
  tinyxml                           2.6.2  h4bd325d_2           conda-forge/linux-64     Cached
  tinyxml2                          8.0.0  he1b5a44_1           conda-forge/linux-64     Cached
  tk                               8.6.10  hed695b0_1           conda-forge/linux-64       3 MB
  urdfdom                           2.3.3  h4bd325d_1           conda-forge/linux-64     Cached
  urdfdom_headers                   1.0.5  hc9558a2_2           conda-forge/linux-64     Cached
  wheel                            0.36.2  pyhd3deb0d_0         conda-forge/noarch       Cached
  x264                     1!152.20180806  h14c3975_0           conda-forge/linux-64     Cached
  xorg-fixesproto                     5.0  h14c3975_1002        conda-forge/linux-64       8 KB
  xorg-kbproto                      1.0.7  h14c3975_1002        conda-forge/linux-64      26 KB
  xorg-libice                      1.0.10  h516909a_0           conda-forge/linux-64     Cached
  xorg-libsm                        1.2.3  h4937e3b_1000        conda-forge/linux-64      25 KB
  xorg-libx11                      1.6.12  h516909a_0           conda-forge/linux-64     917 KB
  xorg-libxau                       1.0.9  h14c3975_0           conda-forge/linux-64     Cached
  xorg-libxaw                      1.0.14  h7f98852_0           conda-forge/linux-64     Cached
  xorg-libxdmcp                     1.1.3  h516909a_0           conda-forge/linux-64      18 KB
  xorg-libxext                      1.3.4  h516909a_0           conda-forge/linux-64     Cached
  xorg-libxfixes                    5.0.3  h14c3975_1004        conda-forge/linux-64      17 KB
  xorg-libxmu                       1.1.3  h516909a_0           conda-forge/linux-64     Cached
  xorg-libxpm                      3.5.13  h516909a_0           conda-forge/linux-64     Cached
  xorg-libxrender                  0.9.10  h14c3975_1002        conda-forge/linux-64      31 KB
  xorg-libxt                        1.1.5  h516909a_1003        conda-forge/linux-64     Cached
  xorg-renderproto                 0.11.1  h14c3975_1002        conda-forge/linux-64     Cached
  xorg-xextproto                    7.3.0  h14c3975_1002        conda-forge/linux-64     Cached
  xorg-xproto                      7.0.31  h14c3975_1007        conda-forge/linux-64      72 KB
  xz                                5.2.5  h516909a_1           conda-forge/linux-64     Cached
  yaml                              0.2.5  h516909a_0           conda-forge/linux-64     Cached
  zeromq                            4.3.4  h9c3ff4c_0           conda-forge/linux-64     Cached
  zlib                             1.2.11  h516909a_1010        conda-forge/linux-64     Cached
  zstd                              1.4.9  ha95c52a_0           conda-forge/linux-64     Cached
  zziplib                         0.13.69  hed695b0_1           conda-forge/linux-64     Cached

  Summary:

  Install: 145 packages

  Total download: 203 MB

─────────────────────────────────────────────────────────────────────────────────────────────────

Confirm changes: [Y/n]

conda (test) root@4442114f7f41:/# conda install boost gazebo
Collecting package metadata (current_repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: failed with repodata from current_repodata.json, will retry with next repodata source.
Collecting package metadata (repodata.json): done
Solving environment: done

## Package Plan ##

  environment location: /root/miniforge3/envs/test

  added / updated specs:
    - boost
    - gazebo


The following packages will be downloaded:

    package                    |            build
    ---------------------------|-----------------
    libignition-fuel-tools4-4.3.0|       hf08c594_2         264 KB  conda-forge
    xorg-kbproto-1.0.7         |    h7f98852_1002          27 KB  conda-forge
    ------------------------------------------------------------
                                           Total:         290 KB

The following NEW packages will be INSTALLED:

  _libgcc_mutex      conda-forge/linux-64::_libgcc_mutex-0.1-conda_forge
  _openmp_mutex      conda-forge/linux-64::_openmp_mutex-4.5-1_gnu
  alsa-lib           conda-forge/linux-64::alsa-lib-1.2.3-h516909a_0
  assimp             conda-forge/linux-64::assimp-5.0.1-hedfc422_5
  atk-1.0            conda-forge/linux-64::atk-1.0-2.36.0-h3371d22_4
  boost              conda-forge/linux-64::boost-1.74.0-py39h5472131_3
  boost-cpp          conda-forge/linux-64::boost-cpp-1.74.0-hc6e9bd1_3
  bullet-cpp         conda-forge/linux-64::bullet-cpp-3.09-hde0f152_2
  bzip2              conda-forge/linux-64::bzip2-1.0.8-h7f98852_4
  c-ares             conda-forge/linux-64::c-ares-1.17.1-h7f98852_1
  ca-certificates    conda-forge/linux-64::ca-certificates-2021.5.30-ha878542_0
  cairo              conda-forge/linux-64::cairo-1.16.0-h6cf1ce9_1008
  certifi            conda-forge/linux-64::certifi-2021.5.30-py39hf3d152e_0
  cfitsio            conda-forge/linux-64::cfitsio-3.470-hb418390_7
  console_bridge     conda-forge/linux-64::console_bridge-1.0.1-h4bd325d_0
  cppzmq             conda-forge/linux-64::cppzmq-4.7.1-hf7cf922_2
  curl               conda-forge/linux-64::curl-7.77.0-hea6ffbf_0
  dartsim            conda-forge/linux-64::dartsim-6.10.1-h53b96f2_0
  dbus               conda-forge/linux-64::dbus-1.13.6-h48d8840_2
  eigen              conda-forge/linux-64::eigen-3.3.9-h4bd325d_1
  expat              conda-forge/linux-64::expat-2.4.1-h9c3ff4c_0
  fcl                conda-forge/linux-64::fcl-0.6.1-h2cbc392_3
  ffmpeg             conda-forge/linux-64::ffmpeg-4.3.1-hca11adc_2
  flann              conda-forge/linux-64::flann-1.9.1-h2e58136_1008
  font-ttf-dejavu-s~ conda-forge/noarch::font-ttf-dejavu-sans-mono-2.37-hab24e00_0
  font-ttf-inconsol~ conda-forge/noarch::font-ttf-inconsolata-3.000-h77eed37_0
  font-ttf-source-c~ conda-forge/noarch::font-ttf-source-code-pro-2.038-h77eed37_0
  font-ttf-ubuntu    conda-forge/noarch::font-ttf-ubuntu-0.83-hab24e00_0
  fontconfig         conda-forge/linux-64::fontconfig-2.13.1-hba837de_1005
  fonts-conda-ecosy~ conda-forge/noarch::fonts-conda-ecosystem-1-0
  fonts-conda-forge  conda-forge/noarch::fonts-conda-forge-1-0
  freeglut           conda-forge/linux-64::freeglut-3.2.1-h9c3ff4c_2
  freeimage          conda-forge/linux-64::freeimage-3.18.0-h88c329d_7
  freetype           conda-forge/linux-64::freetype-2.10.4-h0708190_1
  freexl             conda-forge/linux-64::freexl-1.0.6-h7f98852_0
  fribidi            conda-forge/linux-64::fribidi-1.0.10-h36c2ea0_0
  gazebo             conda-forge/linux-64::gazebo-11.5.1-haa37ec6_2
  gdbm               conda-forge/linux-64::gdbm-1.18-h0a1914f_2
  gdk-pixbuf         conda-forge/linux-64::gdk-pixbuf-2.42.6-h04a7f16_0
  geos               conda-forge/linux-64::geos-3.9.1-h9c3ff4c_2
  geotiff            conda-forge/linux-64::geotiff-1.6.0-hcf90da6_5
  gettext            conda-forge/linux-64::gettext-0.19.8.1-h0b5b191_1005
  giflib             conda-forge/linux-64::giflib-5.2.1-h36c2ea0_2
  glib               conda-forge/linux-64::glib-2.68.2-h9c3ff4c_2
  glib-tools         conda-forge/linux-64::glib-tools-2.68.2-h9c3ff4c_2
  gmp                conda-forge/linux-64::gmp-6.2.1-h58526e2_0
  gnutls             conda-forge/linux-64::gnutls-3.6.13-h85f3911_1
  graphite2          conda-forge/linux-64::graphite2-1.3.13-h58526e2_1001
  graphviz           conda-forge/linux-64::graphviz-2.47.2-h85b4f2f_0
  gst-plugins-base   conda-forge/linux-64::gst-plugins-base-1.18.4-hf529b03_2
  gstreamer          conda-forge/linux-64::gstreamer-1.18.4-h76c114f_2
  gtk2               conda-forge/linux-64::gtk2-2.24.33-h539f30e_1
  gts                conda-forge/linux-64::gts-0.7.6-h64030ff_2
  harfbuzz           conda-forge/linux-64::harfbuzz-2.8.1-h83ec7ef_0
  hdf4               conda-forge/linux-64::hdf4-4.2.15-h10796ff_3
  hdf5               conda-forge/linux-64::hdf5-1.10.6-nompi_h6a2412b_1114
  icu                conda-forge/linux-64::icu-68.1-h58526e2_0
  ilmbase            conda-forge/linux-64::ilmbase-2.5.5-h780b84a_0
  jpeg               conda-forge/linux-64::jpeg-9d-h36c2ea0_0
  json-c             conda-forge/linux-64::json-c-0.15-h98cffda_0
  jsoncpp            conda-forge/linux-64::jsoncpp-1.9.4-h4bd325d_2
  jxrlib             conda-forge/linux-64::jxrlib-1.1-h7f98852_2
  kealib             conda-forge/linux-64::kealib-1.4.14-hcc255d8_2
  krb5               conda-forge/linux-64::krb5-1.19.1-hcc1bbae_0
  lame               conda-forge/linux-64::lame-3.100-h7f98852_1001
  lcms2              conda-forge/linux-64::lcms2-2.12-hddcbb42_0
  ld_impl_linux-64   conda-forge/linux-64::ld_impl_linux-64-2.35.1-hea4e1c9_2
  libblas            conda-forge/linux-64::libblas-3.9.0-9_openblas
  libcblas           conda-forge/linux-64::libcblas-3.9.0-9_openblas
  libccd             conda-forge/linux-64::libccd-2.1-h9c3ff4c_1
  libclang           conda-forge/linux-64::libclang-11.1.0-default_ha53f305_1
  libcurl            conda-forge/linux-64::libcurl-7.77.0-h2574ce0_0
  libdap4            conda-forge/linux-64::libdap4-3.20.6-hd7c4107_2
  libedit            conda-forge/linux-64::libedit-3.1.20191231-he28a2e2_2
  libev              conda-forge/linux-64::libev-4.33-h516909a_1
  libevent           conda-forge/linux-64::libevent-2.1.10-hcdb4288_3
  libffi             conda-forge/linux-64::libffi-3.3-h58526e2_2
  libgcc-ng          conda-forge/linux-64::libgcc-ng-9.3.0-h2828fa1_19
  libgd              conda-forge/linux-64::libgd-2.3.2-h78a0170_0
  libgdal            conda-forge/linux-64::libgdal-3.3.0-h679344c_1
  libgfortran-ng     conda-forge/linux-64::libgfortran-ng-9.3.0-hff62375_19
  libgfortran5       conda-forge/linux-64::libgfortran5-9.3.0-hff62375_19
  libglib            conda-forge/linux-64::libglib-2.68.2-h3e27bee_2
  libglu             conda-forge/linux-64::libglu-9.0.0-he1b5a44_1001
  libgomp            conda-forge/linux-64::libgomp-9.3.0-h2828fa1_19
  libiconv           conda-forge/linux-64::libiconv-1.16-h516909a_0
  libignition-cmake2 conda-forge/linux-64::libignition-cmake2-2.8.0-h9c3ff4c_0
  libignition-commo~ conda-forge/linux-64::libignition-common3-3.11.1-h4b9f6df_0
  libignition-fuel-~ conda-forge/linux-64::libignition-fuel-tools4-4.3.0-hf08c594_2
  libignition-math6  conda-forge/linux-64::libignition-math6-6.8.0-h9c3ff4c_0
  libignition-msgs5  conda-forge/linux-64::libignition-msgs5-5.3.0-hc438e01_6
  libignition-tools1 conda-forge/linux-64::libignition-tools1-1.2.0-h21f569a_0
  libignition-trans~ conda-forge/linux-64::libignition-transport8-8.1.0-h3ef4182_6
  libkml             conda-forge/linux-64::libkml-1.3.0-h238a007_1013
  liblapack          conda-forge/linux-64::liblapack-3.9.0-9_openblas
  libllvm11          conda-forge/linux-64::libllvm11-11.1.0-hf817b99_2
  libnetcdf          conda-forge/linux-64::libnetcdf-4.8.0-nompi_hcd642e3_103
  libnghttp2         conda-forge/linux-64::libnghttp2-1.43.0-h812cca2_0
  libode             conda-forge/linux-64::libode-0.16.2-he80948d_6
  libogg             conda-forge/linux-64::libogg-1.3.4-h7f98852_1
  libopenblas        conda-forge/linux-64::libopenblas-0.3.15-pthreads_h8fe5266_1
  libopus            conda-forge/linux-64::libopus-1.3.1-h7f98852_1
  libpng             conda-forge/linux-64::libpng-1.6.37-h21135ba_2
  libpq              conda-forge/linux-64::libpq-13.3-hd57d9b9_0
  libprotobuf        conda-forge/linux-64::libprotobuf-3.15.8-h780b84a_0
  libraw             conda-forge/linux-64::libraw-0.20.2-h10796ff_1
  librsvg            conda-forge/linux-64::librsvg-2.50.5-hc3c00ef_0
  librttopo          conda-forge/linux-64::librttopo-1.1.0-h1185371_6
  libsdformat        conda-forge/linux-64::libsdformat-9.3.0-hefbcfa8_3
  libsodium          conda-forge/linux-64::libsodium-1.0.18-h36c2ea0_1
  libspatialite      conda-forge/linux-64::libspatialite-5.0.1-h20cb978_4
  libssh2            conda-forge/linux-64::libssh2-1.9.0-ha56f1ee_6
  libstdcxx-ng       conda-forge/linux-64::libstdcxx-ng-9.3.0-h6de172a_19
  libtar             conda-forge/linux-64::libtar-1.2.20-h7f98852_1002
  libtiff            conda-forge/linux-64::libtiff-4.2.0-hbd63e13_2
  libtool            conda-forge/linux-64::libtool-2.4.6-h58526e2_1007
  libusb             conda-forge/linux-64::libusb-1.0.24-h18f079d_4
  libuuid            conda-forge/linux-64::libuuid-2.32.1-h7f98852_1000
  libvorbis          conda-forge/linux-64::libvorbis-1.3.7-h9c3ff4c_0
  libwebp            conda-forge/linux-64::libwebp-1.2.0-h3452ae3_0
  libwebp-base       conda-forge/linux-64::libwebp-base-1.2.0-h7f98852_2
  libxcb             conda-forge/linux-64::libxcb-1.13-h7f98852_1003
  libxkbcommon       conda-forge/linux-64::libxkbcommon-1.0.3-he3ba5ed_0
  libxml2            conda-forge/linux-64::libxml2-2.9.12-h72842e0_0
  libzip             conda-forge/linux-64::libzip-1.7.3-h4de3113_0
  lz4-c              conda-forge/linux-64::lz4-c-1.9.3-h9c3ff4c_0
  mysql-common       conda-forge/linux-64::mysql-common-8.0.23-ha770c72_2
  mysql-libs         conda-forge/linux-64::mysql-libs-8.0.23-h935591d_2
  ncurses            conda-forge/linux-64::ncurses-6.2-h58526e2_4
  nettle             conda-forge/linux-64::nettle-3.6-he412f7d_0
  nspr               conda-forge/linux-64::nspr-4.30-h9c3ff4c_0
  nss                conda-forge/linux-64::nss-3.66-hb5efdd6_0
  numpy              conda-forge/linux-64::numpy-1.20.3-py39hdbf815f_1
  octomap            conda-forge/linux-64::octomap-1.9.7-h4bd325d_0
  ogre               conda-forge/linux-64::ogre-1.10.12-hf655ca9_7
  openal-soft        conda-forge/linux-64::openal-soft-1.20.1-hc9558a2_0
  openexr            conda-forge/linux-64::openexr-2.5.5-hf817b99_0
  openh264           conda-forge/linux-64::openh264-2.1.1-h780b84a_0
  openjpeg           conda-forge/linux-64::openjpeg-2.4.0-hb52868f_1
  openssl            conda-forge/linux-64::openssl-1.1.1k-h7f98852_0
  pango              conda-forge/linux-64::pango-1.48.5-hb8ff022_0
  patchelf           conda-forge/linux-64::patchelf-0.11-he1b5a44_0
  pcre               conda-forge/linux-64::pcre-8.44-he1b5a44_0
  pip                conda-forge/noarch::pip-21.1.2-pyhd8ed1ab_0
  pixman             conda-forge/linux-64::pixman-0.40.0-h36c2ea0_0
  poppler            conda-forge/linux-64::poppler-21.03.0-h93df280_0
  poppler-data       conda-forge/noarch::poppler-data-0.4.10-0
  postgresql         conda-forge/linux-64::postgresql-13.3-h2510834_0
  proj               conda-forge/linux-64::proj-8.0.0-h277dcde_0
  protobuf           conda-forge/linux-64::protobuf-3.15.8-py39he80948d_0
  pthread-stubs      conda-forge/linux-64::pthread-stubs-0.4-h36c2ea0_1001
  pugixml            conda-forge/linux-64::pugixml-1.11.4-h9c3ff4c_0
  python             conda-forge/linux-64::python-3.9.4-hffdb5ce_0_cpython
  python_abi         conda-forge/linux-64::python_abi-3.9-1_cp39
  qt                 conda-forge/linux-64::qt-5.12.9-hda022c4_4
  qwt                conda-forge/linux-64::qwt-6.1.6-h7ec6b3e_0
  readline           conda-forge/linux-64::readline-8.1-h46c0cb4_0
  ruby               conda-forge/linux-64::ruby-2.7.2-he592edb_3
  sdl2               conda-forge/linux-64::sdl2-2.0.12-h9c3ff4c_1
  setuptools         conda-forge/linux-64::setuptools-49.6.0-py39hf3d152e_3
  simbody            conda-forge/linux-64::simbody-3.7-h64f3f5a_2
  six                conda-forge/noarch::six-1.16.0-pyh6c4a22f_0
  sqlite             conda-forge/linux-64::sqlite-3.35.5-h74cdb3f_0
  swig               conda-forge/linux-64::swig-4.0.2-hd3c618e_2
  tbb                conda-forge/linux-64::tbb-2020.2-h4bd325d_4
  tbb-devel          conda-forge/linux-64::tbb-devel-2020.2-h4bd325d_4
  tiledb             conda-forge/linux-64::tiledb-2.2.9-h91fcb0e_0
  tinyxml            conda-forge/linux-64::tinyxml-2.6.2-h4bd325d_2
  tinyxml2           conda-forge/linux-64::tinyxml2-8.0.0-h9c3ff4c_1
  tk                 conda-forge/linux-64::tk-8.6.10-h21135ba_1
  tzcode             conda-forge/linux-64::tzcode-2021a-h7f98852_1
  tzdata             conda-forge/noarch::tzdata-2021a-he74cb21_0
  urdfdom            conda-forge/linux-64::urdfdom-2.3.3-h4bd325d_1
  urdfdom_headers    conda-forge/linux-64::urdfdom_headers-1.0.5-h4bd325d_2
  wheel              conda-forge/noarch::wheel-0.36.2-pyhd3deb0d_0
  x264               conda-forge/linux-64::x264-1!161.3030-h7f98852_0
  xerces-c           conda-forge/linux-64::xerces-c-3.2.3-h9d8b166_2
  xorg-fixesproto    conda-forge/linux-64::xorg-fixesproto-5.0-h7f98852_1002
  xorg-inputproto    conda-forge/linux-64::xorg-inputproto-2.3.2-h7f98852_1002
  xorg-kbproto       conda-forge/linux-64::xorg-kbproto-1.0.7-h7f98852_1002
  xorg-libice        conda-forge/linux-64::xorg-libice-1.0.10-h7f98852_0
  xorg-libsm         conda-forge/linux-64::xorg-libsm-1.2.3-hd9c2040_1000
  xorg-libx11        conda-forge/linux-64::xorg-libx11-1.6.12-h36c2ea0_0
  xorg-libxau        conda-forge/linux-64::xorg-libxau-1.0.9-h7f98852_0
  xorg-libxaw        conda-forge/linux-64::xorg-libxaw-1.0.14-h7f98852_0
  xorg-libxdmcp      conda-forge/linux-64::xorg-libxdmcp-1.1.3-h7f98852_0
  xorg-libxext       conda-forge/linux-64::xorg-libxext-1.3.4-h516909a_0
  xorg-libxfixes     conda-forge/linux-64::xorg-libxfixes-5.0.3-h516909a_1004
  xorg-libxi         conda-forge/linux-64::xorg-libxi-1.7.10-h516909a_0
  xorg-libxmu        conda-forge/linux-64::xorg-libxmu-1.1.3-h516909a_0
  xorg-libxpm        conda-forge/linux-64::xorg-libxpm-3.5.13-h516909a_0
  xorg-libxrender    conda-forge/linux-64::xorg-libxrender-0.9.10-h516909a_1002
  xorg-libxt         conda-forge/linux-64::xorg-libxt-1.1.5-h516909a_1003
  xorg-renderproto   conda-forge/linux-64::xorg-renderproto-0.11.1-h7f98852_1002
  xorg-xextproto     conda-forge/linux-64::xorg-xextproto-7.3.0-h7f98852_1002
  xorg-xproto        conda-forge/linux-64::xorg-xproto-7.0.31-h7f98852_1007
  xz                 conda-forge/linux-64::xz-5.2.5-h516909a_1
  yaml               conda-forge/linux-64::yaml-0.2.5-h516909a_0
  zeromq             conda-forge/linux-64::zeromq-4.3.4-h9c3ff4c_0
  zlib               conda-forge/linux-64::zlib-1.2.11-h516909a_1010
  zstd               conda-forge/linux-64::zstd-1.4.9-ha95c52a_0
  zziplib            conda-forge/linux-64::zziplib-0.13.69-h27826a3_1

[wolfv]

@traversaro is this a fresh environment with latest libsolv (0.7.19)? I pushed an update to libsolv on Friday which should have resolved this issue. Would be interesting to hear which libsolv version you have.

[wolfv]

For reference, these two PRs are included in the latest libsolv on conda-forge:

• improve conda variant handling openSUSE/libsolv#448
• enable build timestamp maximization openSUSE/libsolv#449

[traversaro]

I was in an hurry when I opened the issue. I am currently in the fields, as soon as I back at the laptop I will provide the full details on the base env.

[wolfv]

Thanks, no worries!

[traversaro]

Yes, it seems that the latest libsolv is used:

(base) root@4442114f7f41:/# conda list
# packages in environment at /root/miniforge3:
#
# Name                    Version                   Build  Channel
_libgcc_mutex             0.1                 conda_forge    conda-forge
_openmp_mutex             4.5                       1_gnu    conda-forge
brotlipy                  0.7.0           py39h3811e60_1001    conda-forge
bzip2                     1.0.8                h7f98852_4    conda-forge
c-ares                    1.17.1               h7f98852_1    conda-forge
ca-certificates           2021.5.30            ha878542_0    conda-forge
certifi                   2021.5.30        py39hf3d152e_0    conda-forge
cffi                      1.14.5           py39he32792d_0    conda-forge
chardet                   4.0.0            py39hf3d152e_1    conda-forge
conda                     4.10.1           py39hf3d152e_0    conda-forge
conda-package-handling    1.7.3            py39h3811e60_0    conda-forge
cryptography              3.4.7            py39hbca0aa6_0    conda-forge
icu                       68.1                 h58526e2_0    conda-forge
idna                      2.10               pyh9f0ad1d_0    conda-forge
krb5                      1.19.1               hcc1bbae_0    conda-forge
ld_impl_linux-64          2.35.1               hea4e1c9_2    conda-forge
libarchive                3.5.1                hccf745f_2    conda-forge
libcurl                   7.77.0               h2574ce0_0    conda-forge
libedit                   3.1.20191231         he28a2e2_2    conda-forge
libev                     4.33                 h516909a_1    conda-forge
libffi                    3.3                  h58526e2_2    conda-forge
libgcc-ng                 9.3.0               h2828fa1_19    conda-forge
libgomp                   9.3.0               h2828fa1_19    conda-forge
libiconv                  1.16                 h516909a_0    conda-forge
libnghttp2                1.43.0               h812cca2_0    conda-forge
libsolv                   0.7.19               h780b84a_1    conda-forge
libssh2                   1.9.0                ha56f1ee_6    conda-forge
libstdcxx-ng              9.3.0               h6de172a_19    conda-forge
libxml2                   2.9.12               h72842e0_0    conda-forge
lz4-c                     1.9.3                h9c3ff4c_0    conda-forge
lzo                       2.10              h516909a_1000    conda-forge
mamba                     0.13.0           py39h951de11_0    conda-forge
ncurses                   6.2                  h58526e2_4    conda-forge
openssl                   1.1.1k               h7f98852_0    conda-forge
pip                       21.1.2             pyhd8ed1ab_0    conda-forge
pycosat                   0.6.3           py39h3811e60_1006    conda-forge
pycparser                 2.20               pyh9f0ad1d_2    conda-forge
pyopenssl                 20.0.1             pyhd8ed1ab_0    conda-forge
pysocks                   1.7.1            py39hf3d152e_3    conda-forge
python                    3.9.4           hffdb5ce_0_cpython    conda-forge
python_abi                3.9                      1_cp39    conda-forge
readline                  8.1                  h46c0cb4_0    conda-forge
reproc                    14.2.1               h36c2ea0_0    conda-forge
reproc-cpp                14.2.1               h58526e2_0    conda-forge
requests                  2.25.1             pyhd3deb0d_0    conda-forge
ruamel_yaml               0.15.80         py39h3811e60_1004    conda-forge
setuptools                49.6.0           py39hf3d152e_3    conda-forge
six                       1.16.0             pyh6c4a22f_0    conda-forge
sqlite                    3.35.5               h74cdb3f_0    conda-forge
tk                        8.6.10               h21135ba_1    conda-forge
tqdm                      4.61.0             pyhd8ed1ab_0    conda-forge
tzdata                    2021a                he74cb21_0    conda-forge
urllib3                   1.26.4             pyhd8ed1ab_0    conda-forge
wheel                     0.36.2             pyhd3deb0d_0    conda-forge
xz                        5.2.5                h516909a_1    conda-forge
yaml                      0.2.5                h516909a_0    conda-forge
zlib                      1.2.11            h516909a_1010    conda-forge
zstd                      1.5.0                ha95c52a_0    conda-forge

[traversaro]

Interestingly, a regular Python 3.8 is installed if the installation command is:

mamba install gazebo boost

[traversaro]

FYI I pinned conda-forge's libsolv to 0.7.18 and the issue does not appear, so it seems to be a regression in conda-forge's libsolv 0.7.19 (possibly related to https://github.com/conda-forge/libsolv-feedstock/pull/49/files ?), see robotology/robotology-superbuild#788 .

[traversaro]

Note that it is also possible that the fact that a non-PyPy Python was installed was never explicitly intentional, and in this case we were a victim of Hyrum's Law.

[wolfv]

@traversaro thanks for letting me know! PyPy comes with a track_feature that should down-weight it in the solution and therefore it shouldn't be picked by default. I'll take a look now... hopefully I can figure out how to fix the regression, sorry about that!

[wolfv]

thanks @traversaro

this issue is currently "fixed" by removing the libsolv package that gave us trouble. I am planning to upload a new one with a new patch that should work better and I tested this specific case with boost + gazebo in the development: openSUSE/libsolv#457

I am thinking about rolling it out today 🤞

[traversaro]

Thanks @wolfv, indeed in robotology/robotology-superbuild#833 we removed the pinnings and everything is working fine for now.