$ conan info [-h] [--paths] [-bo BUILD_ORDER] [-g GRAPH] [-if INSTALL_FOLDER] [-j [JSON]] [-n ONLY] [--package-filter [PACKAGE_FILTER]] [-db [DRY_BUILD]] [-b [BUILD]] [-e ENV] [-o OPTIONS] [-pr PROFILE] [-r REMOTE] [-s SETTINGS] [-u] path_or_reference
Gets information about the dependency graph of a recipe. It can be used with a recipe or a reference for any existing package in your local cache.
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 optional arguments: -h, --help show this help message and exit --paths Show package paths in local cache -bo BUILD_ORDER, --build-order BUILD_ORDER given a modified reference, return an ordered list to build (CI) -g GRAPH, --graph GRAPH Creates file with project dependencies graph. It will generate a DOT or HTML file depending on the filename extension -if INSTALL_FOLDER, --install-folder INSTALL_FOLDER local folder containing the conaninfo.txt and conanbuildinfo.txt files (from a previous conan install execution). Defaulted to current folder, unless --profile, -s or -o is specified. If you specify both install-folder and any setting/option it will raise an error. -j [JSON], --json [JSON] Path to a joon file where the information will be written -n ONLY, --only ONLY Show only the specified fields: "id", "build_id", "remote", "url", "license", "requires", "update", "required", "date", "author", "None". '--paths' information can also be filtered with options "export_folder", "build_folder", "package_folder", "source_folder". Use '--only None' to show only references. --package-filter [PACKAGE_FILTER] Print information only for packages that match the filter pattern e.g., MyPackage/1.2@user/channel or MyPackage* -db [DRY_BUILD], --dry-build [DRY_BUILD] Apply the --build argument to output the information, as it would be done by the install command -b [BUILD], --build [BUILD] Given a build policy, return an ordered list of packages that would be built from sources during the install command -e ENV, --env ENV Environment variables that will be set during the package build, -e CXX=/usr/bin/clang++ -o OPTIONS, --options OPTIONS Define options values, e.g., -o Pkg:with_qt=true -pr PROFILE, --profile PROFILE Apply the specified profile to the install command -r REMOTE, --remote REMOTE Look in the specified remote server -s SETTINGS, --settings SETTINGS Settings to build the package, overwriting the defaults. e.g., -s compiler=gcc -u, --update Check updates exist from upstream remotes
$ conan info . $ conan info myproject_folder $ conan info myproject_folder/conanfile.py $ conan info Hello/1.0@user/channel
The output will look like:
Dependency/0.1@user/channel ID: 5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9 BuildID: None Remote: None URL: http://... License: MIT Updates: Version not checked Creation date: 2017-10-31 14:45:34 Required by: Hello/1.0@user/channel Hello/1.0@user/channel ID: 5ab84d6acfe1f23c4fa5ab84d6acfe1f23c4fa8 BuildID: None Remote: None URL: http://... License: MIT Updates: Version not checked Required by: Project Requires: Hello0/0.1@user/channel
conan info builds the complete dependency graph, like conan install does. The main difference is that it doesn’t try to install or build the binaries, but the package recipes will be retrieved from remotes if necessary.
It is very important to note, that the info command outputs the dependency graph for a given configuration (settings, options), as the dependency graph can be different for different configurations. Then, the input to the conan info command is the same as conan install, the configuration can be specified directly with settings and options, or using profiles.
Also, if you did a previous conan install with a specific configuration, or maybe different installs with different configurations, you can reuse that information with the --install-folder argument:
$ # dir with a conanfile.txt $ mkdir build_release && cd build_release $ conan install .. --profile=gcc54release $ cd .. && mkdir build_debug && cd build_debug $ conan install .. --profile=gcc54debug $ cd .. $ conan info . --install-folder=build_release > info for the release dependency graph install $ conan info . --install-folder=build_debug > info for the debug dependency graph install
It is possible to use the conan info command to extract useful information for Continuous Integration systems. More precisely, it has the --build-order, -bo option, that will produce a machine-readable output with an ordered list of package references, in the order they should be built. E.g., let’s assume that we have a project that depends on Boost and Poco, which in turn depends on OpenSSL and zlib transitively. So we can query our project with a reference that has changed (most likely due to a git push on that package):
$ conan info . -bo zlib/1.2.11@conan/stable [zlib/1.2.11@conan/stable], [OpenSSL/1.0.2l@conan/stable], [Boost/1.60.0@lasote/stable, Poco/1.7.8p3@pocoproject/stable]
Note the result is a list of lists. When there is more than one element in one of the lists, it means that they are decoupled projects and they can be built in parallel by the CI system.
You can also specify the --build-order=ALL argument, if you want just to compute the whole dependency graph build order
$ conan info . --build-order=ALL > [zlib/1.2.11@conan/stable], [OpenSSL/1.0.2l@conan/stable], [Boost/1.60.0@lasote/stable, Poco/1.7.8p3@pocoproject/stable]
Also you can get a list of nodes that would be built (simulation) in an install command specifying a build policy with the
E.g., if I try to install
Boost/1.60.0@lasote/stable recipe with
--build missing build policy and
arch=x86, which libraries will be built?
$ conan info Boost/1.60.0@lasote/stable --build missing -s arch=x86 bzip2/1.0.6@lasote/stable, zlib/1.2.8@lasote/stable, Boost/1.60.0@lasote/stable
You can generate a graph of your dependencies, in dot or html formats:
$ conan info .. --graph=file.html $ file.html # or open the file, double-click
The generated html output contains links to third party resources, the vis.js library (2 files: vis.min.js, vis.min.css). By default they are retrieved from cloudfare. However, for environments without internet connection, these files could be also used from the local cache and installed with conan config install by putting those files in the root of the configuration folder:
- vis.min.js: Default link to “https://cdnjs.cloudflare.com/ajax/libs/vis/4.18.1/vis.min.js”
- vis.min.css: Default link to “https://cdnjs.cloudflare.com/ajax/libs/vis/4.18.1/vis.min.css”
It is not necessary to modify the generated html file. Conan will automatically use the local paths to the cache files if present, or the internet ones if not.