conan graph

$ conan graph [-h] {update-lock,build-order,lock} ...

Generates and manipulates lock files.

positional arguments:
                        sub-command help
    update-lock         merge two lockfiles
    build-order         Returns build-order
    lock                create a lockfile

optional arguments:
  -h, --help            show this help message and exit

conan graph update-lock

$ conan graph update-lock [-h] old_lockfile new_lockfile

Updates the old_lockfile file with the contents of the new_lockfiles.

positional arguments:
  old_lockfile  path to previous lockfile
  new_lockfile  path to modified lockfile

optional arguments:
  -h, --help    show this help message and exit

Only the packages in new_lockfile marked as “modified” will be processed. If a node in old_lockfile is already modified and an incompatible (different binary ID, different revision) updated is attempted, it will raise an error. The updated nodes will keep the “modified” flag when updated in old_lockfile

This command is useful for distributed or concurrent builds of different packages in the same dependency graph locked by the same lockfile. When one package is rebuilt it will modify the package reference, and will be marked as “modified”. The way of integrating the information of package builds into the main lockfile is this command.


Integrate the information of building a “pkgb” package using a lockfile (and modified in the folder pkgb_temp) in the main lockfile:

$ conan graph update-lock release/conan.lock pkgb_temp/release/conan.lock

conan graph build-order

$ conan graph build-order [-h] [-b [BUILD]] [--json JSON] lockfile

Given a lockfile, compute which packages and in which order they should be built, as mandated by the binary ID (package_id()) definitions and the --build argument, which is the same as conan create|install

positional arguments:
  lockfile              lockfile folder

optional arguments:
  -h, --help            show this help message and exit
  -b [BUILD], --build [BUILD]
                        nodes to build
  --json JSON           generate output file in json format

The result is a list of lists, containing tuples. Each tuple contains 2 elements, the first is a UUID of the node of the graph. It is unique and ensures a way to address exactly one node, even if there are nodes with the same reference (it is possible for example to have different build_requires with the same name and version, but different configuration)

conan graph lock

conan graph lock [-h] [-l LOCKFILE] [-b [BUILD]] [-e ENV] [-o OPTIONS]
                        [-pr PROFILE] [-r REMOTE] [-s SETTINGS] [-u]
positional arguments:
  path_or_reference     Path to a folder containing a recipe ( or
                        conanfile.txt) or to a recipe file. e.g.,
                        ./my_project/conanfile.txt. It could also be a

optional arguments:
  -h, --help            show this help message and exit
  -l LOCKFILE, --lockfile LOCKFILE
                        Path to lockfile to be created. If not specified
                        'conan.lock' will be created in current folder
  -b [BUILD], --build [BUILD]
                        Packages to build from source
  -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

This command is similar to conan install or conan info, but with a few differences:

  • It doesn’t need to retrieve binaries, it will only compute what is necessary to do, according to the --build argument and rules

  • Even when --build values are specified, packages will not be built from sources. It will just compute, as a “dry-run” what would happen in an equivalent conan install