conan.conf

The typical location of the conan.conf file is the directory ~/.conan/:

[log]
run_to_output = True        # environment CONAN_LOG_RUN_TO_OUTPUT
run_to_file = False         # environment CONAN_LOG_RUN_TO_FILE
level = critical            # environment CONAN_LOGGING_LEVEL
# trace_file =              # environment CONAN_TRACE_FILE
print_run_commands = False  # environment CONAN_PRINT_RUN_COMMANDS

[general]
default_profile = default
compression_level = 9                 # environment CONAN_COMPRESSION_LEVEL
sysrequires_sudo = True               # environment CONAN_SYSREQUIRES_SUDO
request_timeout = 60                  # environment CONAN_REQUEST_TIMEOUT (seconds)
default_package_id_mode = semver_direct_mode # environment CONAN_DEFAULT_PACKAGE_ID_MODE
# retry = 2                           # environment CONAN_RETRY
# retry_wait = 5                      # environment CONAN_RETRY_WAIT (seconds)
# sysrequires_mode = enabled          # environment CONAN_SYSREQUIRES_MODE (allowed modes enabled/verify/disabled)
# vs_installation_preference = Enterprise, Professional, Community, BuildTools # environment CONAN_VS_INSTALLATION_PREFERENCE
# verbose_traceback = False           # environment CONAN_VERBOSE_TRACEBACK
# error_on_override = False           # environment CONAN_ERROR_ON_OVERRIDE
# bash_path = ""                      # environment CONAN_BASH_PATH (only windows)
# read_only_cache = True              # environment CONAN_READ_ONLY_CACHE
# cache_no_locks = True               # environment CONAN_CACHE_NO_LOCKS
# user_home_short = your_path         # environment CONAN_USER_HOME_SHORT
# use_always_short_paths = False      # environment CONAN_USE_ALWAYS_SHORT_PATHS
# skip_vs_projects_upgrade = False    # environment CONAN_SKIP_VS_PROJECTS_UPGRADE
# non_interactive = False             # environment CONAN_NON_INTERACTIVE
# skip_broken_symlinks_check = False  # enviornment CONAN_SKIP_BROKEN_SYMLINKS_CHECK

# conan_make_program = make           # environment CONAN_MAKE_PROGRAM (overrides the make program used in AutoToolsBuildEnvironment.make)
# conan_cmake_program = cmake         # environment CONAN_CMAKE_PROGRAM (overrides the make program used in CMake.cmake_program)

# cmake_generator                     # environment CONAN_CMAKE_GENERATOR
# https://vtk.org/Wiki/CMake_Cross_Compiling
# cmake_generator_platform            # environment CONAN_CMAKE_GENERATOR_PLATFORM
# cmake_toolchain_file                # environment CONAN_CMAKE_TOOLCHAIN_FILE
# cmake_system_name                   # environment CONAN_CMAKE_SYSTEM_NAME
# cmake_system_version                # environment CONAN_CMAKE_SYSTEM_VERSION
# cmake_system_processor              # environment CONAN_CMAKE_SYSTEM_PROCESSOR
# cmake_find_root_path                # environment CONAN_CMAKE_FIND_ROOT_PATH
# cmake_find_root_path_mode_program   # environment CONAN_CMAKE_FIND_ROOT_PATH_MODE_PROGRAM
# cmake_find_root_path_mode_library   # environment CONAN_CMAKE_FIND_ROOT_PATH_MODE_LIBRARY
# cmake_find_root_path_mode_include   # environment CONAN_CMAKE_FIND_ROOT_PATH_MODE_INCLUDE

# msbuild_verbosity = minimal         # environment CONAN_MSBUILD_VERBOSITY

# cpu_count = 1             # environment CONAN_CPU_COUNT

# Change the default location for building test packages to a temporary folder
# which is deleted after the test.
# temp_test_folder = True             # environment CONAN_TEMP_TEST_FOLDER

# cacert_path                         # environment CONAN_CACERT_PATH

[storage]
# This is the default path, but you can write your own. It must be an absolute path or a
# path beginning with "~" (if the environment var CONAN_USER_HOME is specified, this directory, even
# with "~/", will be relative to the conan user home, not to the system user home)
path = ./data

[proxies]
# Empty (or missing) section will try to use system proxies.
# As documented in https://requests.kennethreitz.org/en/latest/user/advanced/#proxies - but see below
# for proxies to specific hosts
# http = http://user:pass@10.10.1.10:3128/
# http = http://10.10.1.10:3128
# https = http://10.10.1.10:1080
# To specify a proxy for a specific host or hosts, use multiple lines each specifying host = proxy-spec
# http =
#   hostname.to.be.proxied.com = http://user:pass@10.10.1.10:3128
# You can skip the proxy for the matching (fnmatch) urls (comma-separated)
# no_proxy_match = *bintray.com*, https://myserver.*

[hooks]  # environment CONAN_HOOKS
attribute_checker

# Default settings now declared in the default profile

Log

The level variable, defaulted to 50 (critical events), declares the LOG level . If you want to show more detailed logging information, set this variable to lower values, as 10 to show debug information, or use the level names as critical, error, warning, info and debug. You can also adjust the environment variable CONAN_LOGGING_LEVEL. The level number is related to the Python Logging Levels.

The print_run_commands, when is 1, Conan will print the executed commands in self.run to the output. You can also adjust the environment variable CONAN_PRINT_RUN_COMMANDS

The run_to_file variable, defaulted to False, will print the output from the self.run executions to the path that the variable specifies. You can also adjust the environment variable CONAN_LOG_RUN_TO_FILE.

The run_to_output variable, defaulted to 1, will print to the stdout the output from the self.run executions in the conanfile. You can also adjust the environment variable CONAN_LOG_RUN_TO_OUTPUT.

The trace_file variable enable extra logging information about your conan command executions. Set it with an absolute path to a file. You can also adjust the environment variable CONAN_TRACE_FILE.

General

The vs_installation_preference variable determines the preference of usage when searching a Visual installation. The order of preference by default is Enterprise, Professional, Community and BuildTools. It can be fixed to just one type of installation like only BuildTools. You can also adjust the environment variable CONAN_VS_INSTALLATION_PREFERENCE.

The verbose_traceback variable will print the complete traceback when an error occurs in a recipe or even in the conan code base, allowing to debug the detected error.

The error_on_override turn the messages related to dependencies overriding into errors. When a downstream package overrides some dependency upstream, if this variable is True then an error will be raised; to bypass these errors those requirements should be declared explicitly with the override keyword.

The bash_path variable is used only in windows to help the tools.run_in_windows_bash() function to locate our Cygwin/MSYS2 bash. Set it with the bash executable path if it’s not in the PATH or you want to use a different one.

The cache_no_locks variable is used to disable locking mechanism of local cache. This is primary used for debugging purposes, and in general it’s not recommended to disable locks otherwise, as it may result in corrupted packages.

The default_package_id_mode changes the way package IDs are computed. By default, if not specified it will be semver_direct_mode, but can change to any value defined in Using package_id() for Package Dependencies.

The cmake_*** variables will declare the corresponding CMake variable when you use the cmake generator and the CMake build tool.

The msbuild_verbosity variable is used only by MSBuild and CMake build helpers. For the CMake build helper, it has an effect only for `Visual Studio` generators. Variable defines verbosity level used by the `msbuild` tool, as documented on MSDN <https://docs.microsoft.com/en-us/visualstudio/msbuild/msbuild-command-line-reference?view=vs-2017>. By default, `minimal verbosity level is used, matching the Visual Studio IDE behavior. Allowed values are (in ascending order): `quiet`, `minimal`, `normal`, `detailed`, `diagnostic`. You can also adjust the environment variable CONAN_MSBUILD_VERBOSITY.

The conan_make_program variable used by CMake and AutotoolsBuildEnvironment build helpers. It overrides a default `make` executable, might be useful in case you need to use a different make (e.g. BSD Make instead of GNU Make, or MinGW Make). Set it with the make executable path if it’s not in the PATH or you want to use a different one.

The conan_cmake_program variable used only by CMake build helper. It overrides a default `cmake` executable, might be useful in case you need to use a CMake wrapper tool (such as scan build). Set it with the cmake executable path if it’s not in the PATH or you want to use a different one.

The cpu_count variable set the number of cores that the tools.cpu_count() will return, by default the number of cores available in your machine. Conan recipes can use the cpu_count() tool to build the library using more than one core.

The retry variable allows to set up the global default value for the number of retries in all commands related to download/upload. User can override the value provided by the variable if the command provides an argument with the same name.

The retry_wait variable allows to set up the global default value for the time (in seconds) to wait until the next retry on failures in all commands related to download/upload. User can override the value provided by the variable if the command provides an argument with the same name.

The sysrequires_mode variable, defaulted to enabled (allowed modes enabled/verify/disabled) controls whether system packages should be installed into the system via SystemPackageTool helper, typically used in system_requirements(). You can also adjust the environment variable CONAN_SYSREQUIRES_MODE.

The sysrequires_sudo variable, defaulted to True, controls whether sudo is used for installing apt, yum, etc. system packages via SystemPackageTool. You can also adjust the environment variable CONAN_SYSREQUIRES_SUDO.

The request_timeout variable, defaulted to 30 seconds, controls the time after Conan will stop waiting for a response. Timeout is not a time limit on the entire response download; rather, an exception is raised if the server has not issued a response for timeout seconds (more precisely, if no bytes have been received on the underlying socket for timeout seconds). If no timeout is specified explicitly, it do not timeout.

The user_home_short specify the base folder to be used with the short paths feature. If not specified, the packages marked as short_paths will be stored in the C:\.conan (or the current drive letter).

If the variable is set to “None” will disable the short_paths feature in Windows, for modern Windows that enable long paths at the system level.

Setting this variable equal to, or to a subdirectory of, the local conan cache (e.g. ~/.conan) would result in an invalid cache configuration and is therefore disallowed.

The verbose_traceback variable will print the complete traceback when an error occurs in a recipe or even in the conan code base, allowing to debug the detected error.

The cacert_path variable lets the user specify a custom path to the cacert.pem file to use in requests. You can also adjust this value using the environment variable CONAN_CACERT_PATH.

The skip_broken_symlinks_check variable (defaulted to False) allows the existence broken symlinks while creating a package.

Storage

The storage.path variable define the path where all the packages will be stored. By default it is ./data, which is relative to the folder containing this conan.conf file, which by default is the <userhome>/.conan folder. It can start with “~”, and that will be expanded to the current user home folder. If the environment var CONAN_USER_HOME is specified, the “~” will be replaced by the current Conan home (the folder pointed by the CONAN_USER_HOME environment variable).

On Windows:

  • It is recommended to assign it to some unit, e.g. map it to X: in order to avoid hitting the 260 chars path name length limit).
  • Also see the short_paths docs to know more about how to mitigate the limitation of 260 chars path name length limit.
  • It is recommended to disable the Windows indexer or exclude the storage path to avoid problems (busy resources).

Note

If you want to change the default “conan home” (directory where conan.conf file is) you can adjust the environment variable CONAN_USER_HOME.

Proxies

Warning

no_proxy is deprecated in favor of no_proxy_match since Conan 1.16.

If you leave the [proxies] section blank or delete the section, conan will copy the system configured proxies, but if you configured some exclusion rule it won’t work:

[proxies]
# Empty (or missing) section will try to use system proxies.

You can specify http and https proxies as follows. Use the no_proxy_match keyword to specify a list of URLs or patterns that will skip the proxy:

[proxies]
# As documented in https://requests.kennethreitz.org/en/latest/user/advanced/#proxies
http: http://user:pass@10.10.1.10:3128/
http: http://10.10.1.10:3128
https: http://10.10.1.10:1080
http: http://10.10.2.10
    hostname1.to.be.proxied.com = http://user:pass@10.10.3.10
    hostname2.to.be.proxied.com = http://user:pass@10.10.4.10
no_proxy_match: http://url1, http://url2, https://url3*, https://*.custom_domain.*

Use http=None and/or https=None to disable the usage of a proxy.

To nominate a proxy for a specific scheme and host only, add host.to.proxy= in front of the url of the proxy (the host.to.proxy name must exactly match the host name that should be proxied). You can list several host name = proxy pairs on separate indented lines.

You can still specify a default proxy, without a host, which will be used if none of the host names match. If you do not, then the proxy is disabled for non-matching hosts.

If this fails, you might also try to set environment variables:

# linux/osx
$ export HTTP_PROXY="http://10.10.1.10:3128"
$ export HTTPS_PROXY="http://10.10.1.10:1080"

# with user/password
$ export HTTP_PROXY="http://user:pass@10.10.1.10:3128/"
$ export HTTPS_PROXY="http://user:pass@10.10.1.10:3128/"

# windows (note, no quotes here)
$ set HTTP_PROXY=http://10.10.1.10:3128
$ set HTTPS_PROXY=http://10.10.1.10:1080