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FileNotFoundError: [WinError 206] The filename or extension is too long #5122

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2 tasks done
Tracked by #13575
jacobwilliams opened this issue Dec 20, 2023 · 2 comments · May be fixed by #5185
Open
2 tasks done
Tracked by #13575

FileNotFoundError: [WinError 206] The filename or extension is too long #5122

jacobwilliams opened this issue Dec 20, 2023 · 2 comments · May be fixed by #5185
Labels
source::community catch-all for issues filed by community members type::bug describes erroneous operation, use severity::* to classify the type

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@jacobwilliams
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jacobwilliams commented Dec 20, 2023 •
edited by beeankha

Checklist

  • I added a descriptive title
  • I searched open reports and couldn't find a duplicate

What happened?

When running conda build for my package on Windows, I sometimes get this:

Fixing permissions
Traceback (most recent call last):
  File "\build\env\Scripts\conda-build-script.py", line 10, in <module>
    sys.exit(main())
  File "\build\env\lib\site-packages\conda_build\cli\main_build.py", line 495, in main
    execute(sys.argv[1:])
  File "\build\env\lib\site-packages\conda_build\cli\main_build.py", line 475, in execute
    outputs = api.build(
  File "\build\env\lib\site-packages\conda_build\api.py", line 180, in build
    return build_tree(
  File "\build\env\lib\site-packages\conda_build\build.py", line 3097, in build_tree
    packages_from_this = build(metadata, stats,
  File "\build\env\lib\site-packages\conda_build\build.py", line 2369, in build
    newly_built_packages = bundlers[pkg_type](output_d, m, env, stats)
  File "\build\env\lib\site-packages\conda_build\build.py", line 1671, in bundle_conda
    output['checksums'] = create_info_files(metadata, replacements, files, prefix=metadata.config.host_prefix)
  File "\build\env\lib\site-packages\conda_build\build.py", line 1284, in create_info_files
    files_with_prefix = get_files_with_prefix(m, replacements, files, prefix)
  File "\build\env\lib\site-packages\conda_build\build.py", line 948, in get_files_with_prefix
    pfx_matches = have_regex_files([f[2] for f in files_with_prefix], prefix=prefix,
  File "\build\env\lib\site-packages\conda_build\build.py", line 525, in have_regex_files
    match_records_rg = regex_files_rg(files, prefix, tag,
  File "\build\env\lib\site-packages\conda_build\build.py", line 323, in regex_files_rg
    raise e
  File "\build\env\lib\site-packages\conda_build\build.py", line 316, in regex_files_rg
    matches = subprocess.check_output(args, shell=False).rstrip(b'\n').split(b'\n')
  File "\build\env\lib\subprocess.py", line 424, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "\build\env\lib\subprocess.py", line 505, in run
    with Popen(*popenargs, **kwargs) as process:
  File "\build\env\lib\subprocess.py", line 951, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "\build\env\lib\subprocess.py", line 1420, in _execute_child
    hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
FileNotFoundError: [WinError 206] The filename or extension is too long

Sometimes rebooting the computer make it work, but not always. On the theory that i have file names that are too long, I shortened some of them, and that made it work for a while, but now it doesn't work anymore. It seems somewhat random. My package is huge and has many files. I've had this problem for the last several versions of conda and conda-build that I have tried.

Any ideas or suggestions? Seems like a Windows-specific issue (the same package builds fine on Linux and Mac).

Conda Info

active environment : base
    active env location : C:\Desktop\blah\build\env
            shell level : 1
       user config file : C:\.condarc
 populated config files :
          conda version : 23.7.4
    conda-build version : 3.23.3
         python version : 3.10.13.final.0
       virtual packages : __archspec=1=x86_64
                          __cuda=11.0=0
                          __win=0=0
       base environment : C:\Desktop\blah\build\env  (writable)
      conda av data dir : C:\Desktop\blah\build\env\etc\conda
  conda av metadata url : None
           channel URLs : https://repo.anaconda.com/pkgs/main/win-64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/r/win-64
                          https://repo.anaconda.com/pkgs/r/noarch
                          https://repo.anaconda.com/pkgs/msys2/win-64
                          https://repo.anaconda.com/pkgs/msys2/noarch
          package cache : C:\Desktop\blah\build\env\pkgs
                          C:\.conda\pkgs
                          C:\AppData\Local\conda\conda\pkgs
       envs directories : C:\Desktop\blah\build\env\envs
                          C:\.conda\envs
                          C:\AppData\Local\conda\conda\envs
               platform : win-64
             user-agent : conda/23.7.4 requests/2.31.0 CPython/3.10.13 Windows/10 Windows/10.0.19045
          administrator : False
             netrc file : None
           offline mode : False

Conda Config

==> cmd_line <==
debug: False
json: False

Conda list

conda list 
# Name                    Version                   Build  Channel
astunparse                1.6.3              pyhd8ed1ab_0    conda-forge
atomicwrites              1.4.1              pyhd8ed1ab_0    conda-forge
attrs                     23.1.0             pyh71513ae_1    conda-forge
aws-c-auth                0.7.0                h6f3c987_2    conda-forge
aws-c-cal                 0.6.0                h6ba3258_0    conda-forge
aws-c-common              0.8.23               hcfcfb64_0    conda-forge
aws-c-compression         0.2.17               h420beca_1    conda-forge
aws-c-event-stream        0.3.1                had47b81_1    conda-forge
aws-c-http                0.7.11               h72ba615_0    conda-forge
aws-c-io                  0.13.28              ha35c040_0    conda-forge
aws-c-mqtt                0.8.14               h4941efa_2    conda-forge
aws-c-s3                  0.3.13               he04eaa7_2    conda-forge
aws-c-sdkutils            0.1.11               h420beca_1    conda-forge
aws-checksums             0.1.16               h420beca_1    conda-forge
aws-crt-cpp               0.20.3               h247a981_4    conda-forge
aws-sdk-cpp               1.10.57             h1a0519f_17    conda-forge
beautifulsoup4            4.12.2             pyha770c72_0    conda-forge
blis                      0.9.0                hcfcfb64_1    conda-forge
bokeh                     2.4.3              pyhd8ed1ab_3    conda-forge
boltons                   23.0.0             pyhd8ed1ab_0    conda-forge
boost-cpp                 1.78.0               h9f4b32c_4    conda-forge
brotli                    1.0.9                hcfcfb64_9    conda-forge
brotli-bin                1.0.9                hcfcfb64_9    conda-forge
brotli-python             1.0.9           py310h00ffb61_9    conda-forge
build                     0.7.0              pyhd8ed1ab_0    conda-forge
bzip2                     1.0.8                hcfcfb64_5    conda-forge
c-ares                    1.24.0               hcfcfb64_0    conda-forge
ca-certificates           2023.11.17           h56e8100_0    conda-forge
cached-property           1.5.2                hd8ed1ab_1    conda-forge
cached_property           1.5.2              pyha770c72_1    conda-forge
cairo                     1.16.0            hd694305_1014    conda-forge
certifi                   2023.11.17         pyhd8ed1ab_0    conda-forge
cffi                      1.16.0          py310h8d17308_0    conda-forge
chardet                   5.2.0           py310h5588dad_1    conda-forge
charset-normalizer        3.3.2              pyhd8ed1ab_0    conda-forge
click                     8.1.3           win_pyhd8ed1ab_2    conda-forge
cloudpickle               3.0.0              pyhd8ed1ab_0    conda-forge
collada-dom               2.5.0                hcb3fdb8_5    conda-forge
colorama                  0.4.6              pyhd8ed1ab_0    conda-forge
conda                     23.7.4          py310h5588dad_0    conda-forge
conda-build               3.23.3          py310h5588dad_1    conda-forge
conda-package-handling    2.2.0              pyh38be061_0    conda-forge
conda-package-streaming   0.9.0              pyhd8ed1ab_0    conda-forge
conda-verify              3.1.1           py310h5588dad_1006    conda-forge
coverage                  7.2.1           py310h8d17308_0    conda-forge
cryptography              41.0.7          py310hb1f9477_1    conda-forge
cycler                    0.12.1             pyhd8ed1ab_0    conda-forge
cyclonedx-bom             3.11.0             pyhd8ed1ab_0    conda-forge
cyclonedx-python-lib      3.1.5              pyhd8ed1ab_0    conda-forge
cytoolz                   0.12.2          py310h8d17308_1    conda-forge
dask                      2023.3.2           pyhd8ed1ab_0    conda-forge
dask-core                 2023.3.2           pyhd8ed1ab_0    conda-forge
dask-jobqueue             0.8.1              pyhd8ed1ab_0    conda-forge
distributed               2023.3.2.1         pyhd8ed1ab_0    conda-forge
dpcpp-cpp-rt              2023.0.0         h63175ca_25922    conda-forge
expat                     2.5.0                h63175ca_1    conda-forge
f90nml                    1.3.1              pyhd8ed1ab_0    conda-forge
fastnml                   2.0.0              pyhd8ed1ab_0    conda-forge
ffmpeg                    4.3.1                ha925a31_0    conda-forge
filelock                  3.13.1             pyhd8ed1ab_0    conda-forge
font-ttf-dejavu-sans-mono 2.37                 hab24e00_0    conda-forge
font-ttf-inconsolata      3.000                h77eed37_0    conda-forge
font-ttf-source-code-pro  2.038                h77eed37_0    conda-forge
font-ttf-ubuntu           0.83                 h77eed37_1    conda-forge
fontconfig                2.14.2               hbde0cde_0    conda-forge
fonts-conda-ecosystem     1                             0    conda-forge
fonts-conda-forge         1                             0    conda-forge
fonttools                 4.47.0          py310h8d17308_0    conda-forge
fortran_rt                2023.0.0            intel_25922    intel
freetype                  2.12.1               hdaf720e_2    conda-forge
fribidi                   1.0.10               h8d14728_0    conda-forge
fsspec                    2023.12.2          pyhca7485f_0    conda-forge
future                    0.18.3             pyhd8ed1ab_0    conda-forge
getopt-win32              0.1                  hcfcfb64_1    conda-forge
gettext                   0.21.1               h5728263_0    conda-forge
glib                      2.78.3               h12be248_0    conda-forge
glib-tools                2.78.3               h12be248_0    conda-forge
glob2                     0.7                        py_0    conda-forge
graphite2                 1.3.13                     1000    conda-forge
graphviz                  2.50.0               had6c3a3_3    conda-forge
gst-plugins-base          1.22.7               h001b923_1    conda-forge
gstreamer                 1.22.7               hb4038d2_1    conda-forge
gts                       0.7.6                h6b5321d_4    conda-forge
h5py                      3.7.0           nompi_py310hae7a582_102    conda-forge
harfbuzz                  6.0.0                he256f1b_0    conda-forge
hdf5                      1.12.2          nompi_h57737ce_101    conda-forge
icc_rt                    2023.0.0            intel_25922    intel
icu                       70.1                 h0e60522_0    conda-forge
idna                      3.6                pyhd8ed1ab_0    conda-forge
importlib-metadata        7.0.0              pyha770c72_0    conda-forge
importlib_metadata        7.0.0                hd8ed1ab_0    conda-forge
iniconfig                 2.0.0              pyhd8ed1ab_0    conda-forge
intel-cmplr-lib-rt        2023.0.0         h12be248_25922    conda-forge
intel-cmplr-lic-rt        2023.0.0         h57928b3_25922    conda-forge
intel-fortran-rt          2023.0.0         hcfcfb64_25922    conda-forge
intel-opencl-rt           2023.0.0         h927a3ec_25922    conda-forge
intel-openmp              2023.0.0            intel_25922    intel
jedi                      0.18.1             pyhd8ed1ab_2    conda-forge
jinja2                    3.1.2              pyhd8ed1ab_1    conda-forge
jpeg                      9e                   h8ffe710_2    conda-forge
jsonpatch                 1.33               pyhd8ed1ab_0    conda-forge
jsonpointer               2.4             py310h5588dad_3    conda-forge
khronos-opencl-icd-loader 2023.04.17           h64bf75a_0    conda-forge
kiwisolver                1.4.5           py310h232114e_1    conda-forge
krb5                      1.20.1               heb0366b_0    conda-forge
lcms2                     2.12                 h2a16943_0    conda-forge
lerc                      3.0                  h0e60522_0    conda-forge
libabseil                 20230125.3      cxx17_h63175ca_0    conda-forge
libaec                    1.1.2                h63175ca_1    conda-forge
libarchive                3.6.2                h27c7867_0    conda-forge
libarrow                  12.0.1           h0578746_5_cpu    conda-forge
libblas                   3.9.0             20_win64_blis    conda-forge
libbrotlicommon           1.0.9                hcfcfb64_9    conda-forge
libbrotlidec              1.0.9                hcfcfb64_9    conda-forge
libbrotlienc              1.0.9                hcfcfb64_9    conda-forge
libcblas                  3.9.0             20_win64_blis    conda-forge
libclang                  15.0.7          default_h77d9078_3    conda-forge
libclang13                15.0.7          default_h77d9078_3    conda-forge
libcrc32c                 1.1.2                h0e60522_0    conda-forge
libcurl                   8.1.2                h68f0423_0    conda-forge
libdeflate                1.10                 h8ffe710_0    conda-forge
libevent                  2.1.12               h3671451_1    conda-forge
libexpat                  2.5.0                h63175ca_1    conda-forge
libffi                    3.4.2                h8ffe710_5    conda-forge
libgd                     2.3.3                h891f43f_3    conda-forge
libglib                   2.78.3               h16e383f_0    conda-forge
libgoogle-cloud           2.12.0               hbc1b25b_1    conda-forge
libgrpc                   1.56.2               hea2d5f7_1    conda-forge
libhwloc                  2.9.1                h51c2c0f_0    conda-forge
libiconv                  1.17                 hcfcfb64_2    conda-forge
libjpeg-turbo             2.1.4                hcfcfb64_0    conda-forge
liblapack                 3.9.0           5_hd5c7e75_netlib    conda-forge
liblief                   0.12.3               h63175ca_0    conda-forge
libogg                    1.3.4                h8ffe710_1    conda-forge
libpng                    1.6.39               h19919ed_0    conda-forge
libprotobuf               4.23.3               h1975477_1    conda-forge
libsqlite                 3.44.2               hcfcfb64_0    conda-forge
libssh2                   1.11.0               h7dfc565_0    conda-forge
libthrift                 0.18.1               h06f6336_2    conda-forge
libtiff                   4.3.0                hc4061b1_4    conda-forge
libutf8proc               2.8.0                h82a8f57_0    conda-forge
libvorbis                 1.3.7                h0e60522_0    conda-forge
libwebp                   1.3.2                hcfcfb64_1    conda-forge
libwebp-base              1.3.2                hcfcfb64_0    conda-forge
libxcb                    1.15                 hcd874cb_0    conda-forge
libxml2                   2.10.4               hc3477c8_0    conda-forge
libxslt                   1.1.37               h0192164_0    conda-forge
libzlib                   1.2.13               hcfcfb64_5    conda-forge
llvm-openmp               17.0.6               h91493d7_0    conda-forge
locket                    1.0.0              pyhd8ed1ab_0    conda-forge
lz4                       4.3.2           py310hbbb2075_1    conda-forge
lz4-c                     1.9.4                hcfcfb64_0    conda-forge
lzo                       2.10              he774522_1000    conda-forge
m2-msys2-runtime          2.5.0.17080.65c939c               3    conda-forge
m2-patch                  2.7.5                         2    conda-forge
m2w64-gcc-libgfortran     5.3.0                         6    conda-forge
m2w64-gcc-libs            5.3.0                         7    conda-forge
m2w64-gcc-libs-core       5.3.0                         7    conda-forge
m2w64-gmp                 6.1.0                         2    conda-forge
m2w64-libwinpthread-git   5.0.0.4634.697f757               2    conda-forge
markdown                  3.4.1              pyhd8ed1ab_0    conda-forge
markupsafe                2.1.3           py310h8d17308_1    conda-forge
matplotlib-base           3.5.1           py310h79a7439_0    conda-forge
menuinst                  1.4.20          py310h00ffb61_0    conda-forge
mkl                       2023.0.0            intel_25930    intel
msgpack-python            1.0.5           py310h232114e_1    conda-forge
msys2-conda-epoch         20160418                      1    conda-forge
munkres                   1.1.4              pyh9f0ad1d_0    conda-forge
networkx                  3.0                pyhd8ed1ab_0    conda-forge
nodejs                    18.12.1              h57928b3_0    conda-forge
numpy                     1.22.1          py310hcae7c84_0    conda-forge
olefile                   0.47               pyhd8ed1ab_0    conda-forge
openjpeg                  2.5.0                hb211442_0    conda-forge
openscenegraph            3.6.5               h145966f_13    conda-forge
openssl                   3.2.0                hcfcfb64_1    conda-forge
orc                       1.9.0                hf2b8f0d_1    conda-forge
packageurl-python         0.13.1             pyhd8ed1ab_0    conda-forge
packaging                 23.2               pyhd8ed1ab_0    conda-forge
pandas                    1.4.0           py310hf5e1058_0    conda-forge
pango                     1.50.14              hdffb7b3_0    conda-forge
parso                     0.8.3              pyhd8ed1ab_0    conda-forge
partd                     1.4.1              pyhd8ed1ab_0    conda-forge
pcre                      8.45                 h0e60522_0    conda-forge
pcre2                     10.42                h17e33f8_0    conda-forge
pdoc                      13.0.0             pyhd8ed1ab_0    conda-forge
pep517                    0.13.0             pyhd8ed1ab_0    conda-forge
pillow                    8.4.0           py310h22f3323_0    conda-forge
pip                       23.3.2             pyhd8ed1ab_0    conda-forge
pip-requirements-parser   32.0.1             pyhd8ed1ab_0    conda-forge
pixman                    0.42.2               h63175ca_0    conda-forge
pkginfo                   1.9.6              pyhd8ed1ab_0    conda-forge
platformdirs              4.1.0              pyhd8ed1ab_0    conda-forge
pluggy                    1.3.0              pyhd8ed1ab_0    conda-forge
pooch                     1.8.0              pyhd8ed1ab_0    conda-forge
psutil                    5.9.0           py310he2412df_1    conda-forge
pthread-stubs             0.4               hcd874cb_1001    conda-forge
pthreads-win32            2.9.1                hfa6e2cd_3    conda-forge
py                        1.11.0             pyh6c4a22f_0    conda-forge
py-lief                   0.12.3          py310h00ffb61_0    conda-forge
pyarrow                   12.0.1          py310hd1a9178_5_cpu    conda-forge
pycosat                   0.6.6           py310h8d17308_0    conda-forge
pycparser                 2.21               pyhd8ed1ab_0    conda-forge
pygments                  2.17.2             pyhd8ed1ab_0    conda-forge
pyopenssl                 23.3.0             pyhd8ed1ab_0    conda-forge
pyparsing                 3.1.1              pyhd8ed1ab_0    conda-forge
pyqtconsole               1.2.2              pyhd8ed1ab_0    conda-forge
pyqtgraph                 0.13.1             pyhd8ed1ab_1    conda-forge
pyshortcuts               1.8.1           py310h5588dad_0    conda-forge
pyside2                   5.15.7          py310h376e08a_0    conda-forge
pysocks                   1.7.1              pyh0701188_6    conda-forge
pytest                    6.2.5           py310h5588dad_3    conda-forge
pytest-qt                 4.0.2              pyhd8ed1ab_0    conda-forge
python                    3.10.13         h4de0772_0_cpython    conda-forge
python-dateutil           2.8.2              pyhd8ed1ab_0    conda-forge
python-libarchive-c       5.0             py310h5588dad_2    conda-forge
python_abi                3.10                    4_cp310    conda-forge
pytz                      2023.3.post1       pyhd8ed1ab_0    conda-forge
pywin32                   303             py310h8d17308_1    conda-forge
pyyaml                    6.0.1           py310h8d17308_1    conda-forge
qt-main                   5.15.8               h720456b_6    conda-forge
qtpy                      2.0.0              pyhd8ed1ab_0    conda-forge
re2                       2023.03.02           hd4eee63_0    conda-forge
requests                  2.31.0             pyhd8ed1ab_0    conda-forge
ripgrep                   14.0.3               h7f3b576_1    conda-forge
ruamel.yaml               0.17.40         py310h8d17308_0    conda-forge
ruamel.yaml.clib          0.2.7           py310h8d17308_2    conda-forge
scipy                     1.10.1          py310h578b7cb_3    conda-forge
setuptools                65.6.3             pyhd8ed1ab_0    conda-forge
six                       1.16.0             pyh6c4a22f_0    conda-forge
snappy                    1.1.10               hfb803bf_0    conda-forge
sortedcontainers          2.4.0              pyhd8ed1ab_0    conda-forge
soupsieve                 2.5                pyhd8ed1ab_1    conda-forge
tabulate                  0.9.0              pyhd8ed1ab_1    conda-forge
tbb                       2021.9.0             h91493d7_0    conda-forge
tblib                     3.0.0              pyhd8ed1ab_0    conda-forge
tk                        8.6.13               h5226925_1    conda-forge
toml                      0.10.2             pyhd8ed1ab_0    conda-forge
tomli                     2.0.1              pyhd8ed1ab_0    conda-forge
toolz                     0.12.0             pyhd8ed1ab_0    conda-forge
tornado                   6.3.3           py310h8d17308_1    conda-forge
tqdm                      4.66.1             pyhd8ed1ab_0    conda-forge
typing_extensions         4.9.0              pyha770c72_0    conda-forge
tzdata                    2023c                h71feb2d_0    conda-forge
ucrt                      10.0.22621.0         h57928b3_0    conda-forge
unicodedata2              15.1.0          py310h8d17308_0    conda-forge
urllib3                   2.1.0              pyhd8ed1ab_0    conda-forge
vc                        14.3                hcf57466_18    conda-forge
vc14_runtime              14.38.33130         h82b7239_18    conda-forge
vs2015_runtime            14.38.33130         hcb4865c_18    conda-forge
wheel                     0.42.0             pyhd8ed1ab_0    conda-forge
win_inet_pton             1.1.0              pyhd8ed1ab_6    conda-forge
xorg-kbproto              1.0.7             hcd874cb_1002    conda-forge
xorg-libice               1.1.1                hcd874cb_0    conda-forge
xorg-libsm                1.2.4                hcd874cb_0    conda-forge
xorg-libx11               1.8.7                hefa74cf_0    conda-forge
xorg-libxau               1.0.11               hcd874cb_0    conda-forge
xorg-libxdmcp             1.1.3                hcd874cb_0    conda-forge
xorg-libxext              1.3.4                hcd874cb_2    conda-forge
xorg-libxpm               3.5.17               hcd874cb_0    conda-forge
xorg-libxt                1.3.0                hcd874cb_1    conda-forge
xorg-xextproto            7.3.0             hcd874cb_1003    conda-forge
xorg-xproto               7.0.31            hcd874cb_1007    conda-forge
xz                        5.2.6                h8d14728_0    conda-forge
yaml                      0.2.5                h8ffe710_2    conda-forge
zict                      3.0.0              pyhd8ed1ab_0    conda-forge
zipp                      3.17.0             pyhd8ed1ab_0    conda-forge
zlib                      1.2.13               hcfcfb64_5    conda-forge
zstandard                 0.22.0          py310h0009e47_0    conda-forge
zstd                      1.5.5                h12be248_0    conda-forge

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@jacobwilliams jacobwilliams added the type::bug describes erroneous operation, use severity::* to classify the type label Dec 20, 2023
@ForgottenProgramme ForgottenProgramme mentioned this issue Feb 8, 2024
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@travishathaway travishathaway added the source::community catch-all for issues filed by community members label Feb 9, 2024
@adriendelsalle
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I faced the exact same problem when trying to build packages containing many subfolders.
Looks like the issue comes from

conda-build/conda_build/build.py

Lines 355 to 357 in 46dfcf8

file_lists = list(
chunks(prefix_files, (32760 if utils.on_win else 131071) - args_len)
)

In my case, patching with a fixed chunk size of 15000 worked, but it's maybe not optimal to lower the limit each time a user reaches the limit.

Something like:

    file_lists = list(
        chunks(prefix_files, (float(os.environ.get("CONDA_BLD_REGEX_CHUNK_SIZE", 15000)) if utils.on_win else 131071) - args_len)
    )

would be preferable, but I don't know much about the best way to pass a config value to conda-build and there is probably way for improvement here.
I'll open a PR to support this idea!

@adriendelsalle adriendelsalle linked a pull request Feb 15, 2024 that will close this issue
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@jacobwilliams
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I'm curious to know the reason for these magic numbers (32760 & 131071, and now 15000).

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Allow custom chunk size for regex calls on Windows adriendelsalle/conda-build
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@travishathaway @jacobwilliams @adriendelsalle