conan install
$ conan install [-h] [-g GENERATOR] [-if INSTALL_FOLDER] [-m [MANIFESTS]]
[-mi [MANIFESTS_INTERACTIVE]] [-v [VERIFY]]
[--no-imports] [--build-require] [-j JSON] [-b [BUILD]]
[-r REMOTE] [-u] [-l LOCKFILE]
[--lockfile-out LOCKFILE_OUT] [-e ENV_HOST]
[-e:b ENV_BUILD] [-e:h ENV_HOST] [-o OPTIONS_HOST]
[-o:b OPTIONS_BUILD] [-o:h OPTIONS_HOST]
[-pr PROFILE_HOST] [-pr:b PROFILE_BUILD]
[-pr:h PROFILE_HOST] [-s SETTINGS_HOST]
[-s:b SETTINGS_BUILD] [-s:h SETTINGS_HOST]
[-c CONF_HOST] [-c:b CONF_BUILD] [-c:h CONF_HOST]
[--lockfile-node-id LOCKFILE_NODE_ID]
[--require-override REQUIRE_OVERRIDE]
path_or_reference [reference]
Installs the requirements specified in a recipe (conanfile.py or conanfile.txt).
It can also be used to install a concrete package specifying a reference. If any requirement is not found in the local cache, it will retrieve the recipe from a remote, looking for it sequentially in the configured remotes. When the recipes have been downloaded it will try to download a binary package matching the specified settings, only from the remote from which the recipe was retrieved. If no binary package is found, it can be built from sources using the ‘–build’ option. When the package is installed, Conan will write the files for the specified generators.
positional arguments:
path_or_reference Path to a folder containing a recipe (conanfile.py or
conanfile.txt) or to a recipe file. e.g.,
./my_project/conanfile.txt. It could also be a
reference
reference Reference for the conanfile path of the first
argument: user/channel, version@user/channel or
pkg/version@user/channel(if name or version declared
in conanfile.py, they should match)
optional arguments:
-h, --help show this help message and exit
-g GENERATOR, --generator GENERATOR
Generators to use
-if INSTALL_FOLDER, --install-folder INSTALL_FOLDER
Use this directory as the directory where to put the
generatorfiles. e.g., conaninfo/conanbuildinfo.txt
-m [MANIFESTS], --manifests [MANIFESTS]
Install dependencies manifests in folder for later
verify. Default folder is .conan_manifests, but can be
changed
-mi [MANIFESTS_INTERACTIVE], --manifests-interactive [MANIFESTS_INTERACTIVE]
Install dependencies manifests in folder for later
verify, asking user for confirmation. Default folder
is .conan_manifests, but can be changed
-v [VERIFY], --verify [VERIFY]
Verify dependencies manifests against stored ones
--no-imports Install specified packages but avoid running imports
--build-require The provided reference is a build-require
-j JSON, --json JSON Path to a json file where the install information will
be written
-b [BUILD], --build [BUILD]
Optional, specify which packages to build from source.
Combining multiple '--build' options on one command
line is allowed. For dependencies, the optional
'build_policy' attribute in their conanfile.py takes
precedence over the command line parameter. Possible
parameters: --build Force build for all packages, do
not use binary packages. --build=never Disallow build
for all packages, use binary packages or fail if a
binary package is not found. Cannot be combined with
other '--build' options. --build=missing Build
packages from source whose binary package is not
found. --build=outdated Build packages from source
whose binary package was not generated from the latest
recipe or is not found. --build=cascade Build packages
from source that have at least one dependency being
built from source. --build=[pattern] Build packages
from source whose package reference matches the
pattern. The pattern uses 'fnmatch' style wildcards.
--build=![pattern] Excluded packages, which will not
be built from the source, whose package reference
matches the pattern. The pattern uses 'fnmatch' style
wildcards. Default behavior: If you omit the '--build'
option, the 'build_policy' attribute in conanfile.py
will be used if it exists, otherwise the behavior is
like '--build=never'.
-r REMOTE, --remote REMOTE
Look in the specified remote server
-u, --update Will check the remote and in case a newer version
and/or revision of the dependencies exists there, it
will install those in the local cache. When using
version ranges, it will install the latest version
that satisfies the range. Also, if using revisions, it
will update to the latest revision for the resolved
version range.
-l LOCKFILE, --lockfile LOCKFILE
Path to a lockfile
--lockfile-out LOCKFILE_OUT
Filename of the updated lockfile
-e ENV_HOST, --env ENV_HOST
Environment variables that will be set during the
package build (host machine). e.g.: -e
CXX=/usr/bin/clang++
-e:b ENV_BUILD, --env:build ENV_BUILD
Environment variables that will be set during the
package build (build machine). e.g.: -e:b
CXX=/usr/bin/clang++
-e:h ENV_HOST, --env:host ENV_HOST
Environment variables that will be set during the
package build (host machine). e.g.: -e:h
CXX=/usr/bin/clang++
-o OPTIONS_HOST, --options OPTIONS_HOST
Define options values (host machine), e.g.: -o
Pkg:with_qt=true
-o:b OPTIONS_BUILD, --options:build OPTIONS_BUILD
Define options values (build machine), e.g.: -o:b
Pkg:with_qt=true
-o:h OPTIONS_HOST, --options:host OPTIONS_HOST
Define options values (host machine), e.g.: -o:h
Pkg:with_qt=true
-pr PROFILE_HOST, --profile PROFILE_HOST
Apply the specified profile to the host machine
-pr:b PROFILE_BUILD, --profile:build PROFILE_BUILD
Apply the specified profile to the build machine
-pr:h PROFILE_HOST, --profile:host PROFILE_HOST
Apply the specified profile to the host machine
-s SETTINGS_HOST, --settings SETTINGS_HOST
Settings to build the package, overwriting the
defaults (host machine). e.g.: -s compiler=gcc
-s:b SETTINGS_BUILD, --settings:build SETTINGS_BUILD
Settings to build the package, overwriting the
defaults (build machine). e.g.: -s:b compiler=gcc
-s:h SETTINGS_HOST, --settings:host SETTINGS_HOST
Settings to build the package, overwriting the
defaults (host machine). e.g.: -s:h compiler=gcc
-c CONF_HOST, --conf CONF_HOST
Configuration to build the package, overwriting the defaults (host machine). e.g.: -c
tools.cmake.cmaketoolchain:generator=Xcode
-c:b CONF_BUILD, --conf:build CONF_BUILD
Configuration to build the package, overwriting the defaults (build machine). e.g.: -c:b
tools.cmake.cmaketoolchain:generator=Xcode
-c:h CONF_HOST, --conf:host CONF_HOST
Configuration to build the package, overwriting the defaults (host machine). e.g.: -c:h
tools.cmake.cmaketoolchain:generator=Xcode
--lockfile-node-id LOCKFILE_NODE_ID
NodeID of the referenced package in the lockfile
--require-override REQUIRE_OVERRIDE
Define a requirement override
conan install executes methods of a conanfile.py in the following order:
config_options()configure()requirements()package_id()package_info()deploy()
Note this describes the process of installing a pre-built binary package. If the package has to be built, conan install --build executes the following:
config_options()configure()requirements()package_id()build_requirements()build_id()system_requirements()source()imports()build()package()package_info()deploy()
Examples
Install a package requirement from a
conanfile.txt, saved in your current directory with one option and setting (other settings will be defaulted as defined in<userhome>/.conan/profiles/default):$ conan install . -o pkg_name:use_debug_mode=on -s compiler=clang
Install the requirements defined in a
conanfile.pyfile in your current directory, with the default settings in default profile<userhome>/.conan/profiles/default, and specifying the version, user and channel (as they might be used in the recipe):class Pkg(ConanFile): name = "mypkg" # see, no version defined! def requirements(self): # this trick allow to depend on packages on your same user/channel self.requires("dep/0.3@%s/%s" % (self.user, self.channel)) def build(self): if self.version == "myversion": # something specific for this version of the package.
$ conan install . myversion@someuser/somechannel
Those values are cached in a file, so later calls to local commands like
conan buildcan find and use this version, user and channel data.Install the opencv/4.1.1@conan/stable reference with its default options and default settings from
<userhome>/.conan/profiles/default:$ conan install opencv/4.1.1@conan/stable
Install the opencv/4.1.1@conan/stable reference updating the recipe and the binary package if new upstream versions are available:
$ conan install opencv/4.1.1@conan/stable --update
build options
Both the conan install and create commands accept --build options to specify
which packages to build from source. Combining multiple --build options on one command
line is allowed, where a package is built from source if at least one of the given build options
selects it for the build. For dependencies, the optional build_policy attribute in their
conanfile.py can override the behavior of the given command line parameters.
Possible values are:
--build: Always build everything from source. Produces a clean re-build of all packages. and transitively dependent packages
--build=never: Conan will not try to build packages when the requested configuration does not match, in which case it will throw an error. This option can not be combined with other --build options.
--build=missing: Conan will try to build packages from source whose binary package was not found in the requested configuration on any of the active remotes or the cache.
--build=outdated: Conan will try to build packages from source whose binary package was not built with the current recipe or when missing the binary package.
--build=cascade: Conan selects packages for the build where at least one of its dependencies is selected for the build. This is useful to rebuild packages that, directly or indirectly, depend on changed packages.
--build=[pattern]: A fnmatch case-sensitive pattern of a package reference or only the package name. Conan will force the build of the packages whose reference matches the given pattern. Several patterns can be specified, chaining multiple options:
e.g., --build=pattern1 --build=pattern2 can be used to specify more than one pattern.
e.g., --build=zlib will match any package named
zlib(same aszlib/*).e.g., --build=z*@conan/stable will match any package starting with
zwithconan/stableas user/channel.
--build=![pattern]: A fnmatch case-sensitive pattern of a package reference or only the package name. Conan will exclude the build of the packages whose reference matches the given pattern. Several patterns can be specified, chaining multiple options:
e.g., --build=!zlib --build Build all packages from source, except for zlib.
e.g., --build=!z* --build Build all packages from source, except for those starting with
z
If you omit the --build option, the build_policy attribute in conanfile.py will be
looked up. If it is set to missing or always, this build option will be used, otherwise the
command will behave like --build=never was set.
env variables
With the -e parameters you can define:
Global environment variables (-e SOME_VAR="SOME_VALUE"). These variables will be defined before the build step in all the packages and will be cleaned after the build execution.
Specific package environment variables (-e zlib:SOME_VAR="SOME_VALUE"). These variables will be defined only in the specified packages (e.g., zlib).
You can specify this variables not only for your direct requires but for any package in the
dependency graph.
If you want to define an environment variable but you want to append the variables declared in your requirements you can use the [] syntax:
$ conan install . -e PATH=[/other/path]
This way the first entry in the PATH variable will be /other/path but the PATH values
declared in the requirements of the project will be appended at the end using the system path
separator.
settings
With the -s parameters you can define:
Global settings (-s compiler="Visual Studio"). Will apply to all the requires.
Specific package settings (-s zlib:compiler="MinGW"). Those settings will be applied only to the specified packages. They accept patterns too, like
-s *@myuser/*:compiler=MinGW, which means that packages that have the username “myuser” will use MinGW as compiler.Experimental: Settings only for the consumer package. (-s &:compiler="MinGW"). If & is specified as the package name it will apply only to the consumer conanfile (.py or .txt). This is a special case because the consumer conanfile might not declare a name so it would be impossible to reference it.
You can specify custom settings not only for your direct requires but for any package in the
dependency graph.
options
With the -o parameters you can only define specific package options.
$ conan install . -o zlib:shared=True
$ conan install . -o zlib:shared=True -o bzip2:option=132
# you can also apply the same options to many packages with wildcards:
$ conan install . -o *:shared=True
Note
You can use profiles files to create predefined sets of settings, options and environment variables.
conf
Warning
This is an experimental feature subject to breaking changes in future releases.
With the -c parameters you can define specific package configurations.
$ conan install . -c tools.microsoft.msbuild:verbosity=Diagnostic
$ conan install . -c tools.microsoft.msbuild:verbosity=Detailed -c tools.build:processes=10
Note
To list all possible configurations available, run conan config list.
See also
You can see more information about configurations in global.conf section.
reference
An optional positional argument, if used the first argument should be a path.
If the reference specifies name and/or version, and they are also declared in the conanfile.py,
they should match, otherwise, an error will be raised.
$ conan install . # OK, user and channel will be None
$ conan install . user/testing # OK
$ conan install . version@user/testing # OK
$ conan install . pkg/version@user/testing # OK
$ conan install pkg/version@user/testing user/channel # Error, first arg is not a path
lockfiles
The install command accepts several arguments related to lockfiles:
--lockfile=<path-to-lockfile>: Theconan install ... --lockfile=path/to/file.lockcommand will provide an input lockfile to the command. Versions, revisions, and other data contained in that lockfile will be respected. If something has changed locally that diverges with respect the locked information in the lockfile, the command will fail.--lockfile-out=<path-to-lockfile>: This argument will define the filename of the resultinginstalloperation. If the input lockfile has not completely locked something, and the install command can, for example, build some dependency from source with the--build=<dep-name>argument, this will provide new data, like a new package revision. This new data can be captured and locked in the output lockfile.--lockfile-node-id=<node-id>: Experimental, subject to breaking changes. In some cases, it is impossible to reference a package in the dependency graph by name or reference, because there might be several instances of it with the same one. This could happen with some special type of requirements, like build-requires or private requires. Providing thenode-id, as defined in the lockfile file, can define without any ambiguity the package in the graph that the command is referencing.
Note
Installation of binaries can be accelerated setting up parallel downloads with the general.parallel_download
experimental configuration in conan.conf.
–build-require
The --build-require, new in Conan 1.37, is experimental. It allows to install the package using the
configuration and settings of the “build” context, as it was a build_require. Lets see it with an example:
We have a mycmake/1.0 package, which bundles cmake executable, and we are cross-compiling from Windows
to Linux, so all the usual install commands will use something like -pr:b=Windows -pr:h=Linux.
At some point we might want to install the build-require to test it, executing it directly in the
terminal, with -build-require it is possible:
$ conan install mycmake/1.0@ --build-require -g virtualenv -pr:b=Windows -pr:h=Linux
# Installs Windows package binary, not the Linux one.
$ source ./activate.sh && mycmake
# This will execute the "mycmake" from the Windows package.
This also works when building a dependency graph, including build-requires, in CI. As the
conan lock build-order command will return a list including the build/host context, it is
possible to use that to add the --build-require to the command, and build build-requires
as necessary without needing to change the profiles at all.
–require-override
Warning
This is an experimental feature subject to breaking changes in future releases.
New from Conan 1.39
The --require-override argument allows to inject an override requirement to the consumer conanfile being called
by this command, that would be equivalent to:
class Pkg(ConanFile):
def requirements(self):
self.requires("zlib/1.3", override=True)
This allows to dynamically test specific versions upstream without requiring editions to conanfiles. Note however this would not be a generally recommended practice for production, it would be better to actually update the conanfiles to explicitly reflect in code which specific versions upstream are being used.
If the consumer conanfile already contains a direct requirement to that dependency, then such version will be directly overwritten,
but no override=True will be added (note that override=True means that the current package does not depend on that
other package).
This feature affects only to regular requires, not to build_requires or python_requires, as those don’t have such
an overriding mechanism, and they are private to their consumer, not propagating downstream nor upstream.