conan lock create¶
$ conan lock create -h
Migration: Successfully updated settings.yml
Migration: Successfully updated cppstd_compat.py
Migration: Successfully updated profile.py
usage: conan lock create [-h] [-v [V]] [-cc CORE_CONF] [--name NAME]
[--version VERSION] [--user USER] [--channel CHANNEL]
[--requires REQUIRES] [--tool-requires TOOL_REQUIRES]
[-b BUILD] [-r REMOTE | -nr] [-u [UPDATE]]
[-pr PROFILE] [-pr:b PROFILE_BUILD]
[-pr:h PROFILE_HOST] [-pr:a PROFILE_ALL] [-o OPTIONS]
[-o:b OPTIONS_BUILD] [-o:h OPTIONS_HOST]
[-o:a OPTIONS_ALL] [-s SETTINGS]
[-s:b SETTINGS_BUILD] [-s:h SETTINGS_HOST]
[-s:a SETTINGS_ALL] [-c CONF] [-c:b CONF_BUILD]
[-c:h CONF_HOST] [-c:a CONF_ALL] [-l LOCKFILE]
[--lockfile-partial] [--lockfile-out LOCKFILE_OUT]
[--lockfile-clean]
[--lockfile-overrides LOCKFILE_OVERRIDES]
[--build-require]
[path]
Create a lockfile from a conanfile or a reference.
positional arguments:
path Path to a folder containing a recipe (conanfile.py or
conanfile.txt) or to a recipe file. e.g.,
./my_project/conanfile.txt.
options:
-h, --help show this help message and exit
-v [V] Level of detail of the output. Valid options from less
verbose to more verbose: -vquiet, -verror, -vwarning,
-vnotice, -vstatus, -v or -vverbose, -vv or -vdebug,
-vvv or -vtrace
-cc CORE_CONF, --core-conf CORE_CONF
Global configuration for Conan
--name NAME Provide a package name if not specified in conanfile
--version VERSION Provide a package version if not specified in
conanfile
--user USER Provide a user if not specified in conanfile
--channel CHANNEL Provide a channel if not specified in conanfile
--requires REQUIRES Directly provide requires instead of a conanfile
--tool-requires TOOL_REQUIRES
Directly provide tool-requires instead of a conanfile
-b BUILD, --build BUILD
Optional, specify which packages to build from source.
Combining multiple '--build' options on one command
line is allowed. Possible values: --build="*" Force
build from source for all packages. --build=never
Disallow build for all packages, use binary packages
or fail if a binary package is not found, it cannot be
combined with other '--build' options. --build=missing
Build packages from source whose binary package 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.
--build=missing:[pattern] Build from source if a
compatible binary does not exist, only for packages
matching pattern.
-r REMOTE, --remote REMOTE
Look in the specified remote or remotes server
-nr, --no-remote Do not use remote, resolve exclusively in the cache
-u [UPDATE], --update [UPDATE]
Will install newer versions and/or revisions in the
local cache for the given reference, or all in case no
argument is supplied. 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.
-pr PROFILE, --profile PROFILE
Apply the specified profile. By default, or if
specifying -pr:h (--profile:host), it applies to the
host context. Use -pr:b (--profile:build) to specify
the build context, or -pr:a (--profile:all) to specify
both contexts at once
-pr:b PROFILE_BUILD, --profile:build PROFILE_BUILD
-pr:h PROFILE_HOST, --profile:host PROFILE_HOST
-pr:a PROFILE_ALL, --profile:all PROFILE_ALL
-o OPTIONS, --options OPTIONS
Apply the specified options. By default, or if
specifying -o:h (--options:host), it applies to the
host context. Use -o:b (--options:build) to specify
the build context, or -o:a (--options:all) to specify
both contexts at once. Example: -o pkg:with_qt=true
-o:b OPTIONS_BUILD, --options:build OPTIONS_BUILD
-o:h OPTIONS_HOST, --options:host OPTIONS_HOST
-o:a OPTIONS_ALL, --options:all OPTIONS_ALL
-s SETTINGS, --settings SETTINGS
Apply the specified settings. By default, or if
specifying -s:h (--settings:host), it applies to the
host context. Use -s:b (--settings:build) to specify
the build context, or -s:a (--settings:all) to specify
both contexts at once. Example: -s compiler=gcc
-s:b SETTINGS_BUILD, --settings:build SETTINGS_BUILD
-s:h SETTINGS_HOST, --settings:host SETTINGS_HOST
-s:a SETTINGS_ALL, --settings:all SETTINGS_ALL
-c CONF, --conf CONF Apply the specified conf. By default, or if specifying
-c:h (--conf:host), it applies to the host context.
Use -c:b (--conf:build) to specify the build context,
or -c:a (--conf:all) to specify both contexts at once.
Example: -c tools.cmake.cmaketoolchain:generator=Xcode
-c:b CONF_BUILD, --conf:build CONF_BUILD
-c:h CONF_HOST, --conf:host CONF_HOST
-c:a CONF_ALL, --conf:all CONF_ALL
-l LOCKFILE, --lockfile LOCKFILE
Path to a lockfile. Use --lockfile="" to avoid
automatic use of existing 'conan.lock' file
--lockfile-partial Do not raise an error if some dependency is not found
in lockfile
--lockfile-out LOCKFILE_OUT
Filename of the updated lockfile
--lockfile-clean Remove unused entries from the lockfile
--lockfile-overrides LOCKFILE_OVERRIDES
Overwrite lockfile overrides
--build-require Whether the provided reference is a build-require
The conan lock create command creates a lockfile for the recipe or reference specified in path or --requires.
This command will compute the dependency graph, evaluate which binaries do exist or need to be built, but it will
not try to install or build from source those binaries. In that regard, it is equivalent to the conan graph info command.
Most of the arguments accepted by this command are the same as conan graph info (and conan install, conan create),
because the conan lock create creates or update a lockfile for a given configuration.
A lockfile can be created from scratch, computing a new dependency graph from a local conanfile, or from
requires, for example for this conanfile.txt:
[requires]
fmt/9.0.0
[tool_requires]
cmake/3.23.5
We can run:
$ conan lock create .
$ cat conan.lock
{
"version": "0.5",
"requires": [
"fmt/9.0.0#ca4ae2047ef0ccd7d2210d8d91bd0e02%1675126491.773"
],
"build_requires": [
"cmake/3.23.5#5f184bc602682bcea668356d75e7563b%1676913225.027"
],
"python_requires": []
}
conan lock create accepts a --lockfile input lockfile (if a conan.lock default one is found, it will
be automatically used), and then it will add new information in the --lockfile-out (by default, also conan.lock).
For example if we change the above conanfile.txt, removing the tool_requires, updating fmt to 9.1.0
and adding a new dependency to zlib/1.2.13:
[requires]
fmt/9.1.0
zlib/1.2.13
[tool_requires]
We will see how conan lock create extends the existing lockfile with the new configuration, but it doesn’t
remove unused versions or packages from it:
$ conan lock create . # will use the existing conan.lock as base, and rewrite it
# use --lockfile and --lockfile-out to change that behavior
$ cat conan.lock
{
"version": "0.5",
"requires": [
"zlib/1.2.13#13c96f538b52e1600c40b88994de240f%1667396813.733",
"fmt/9.1.0#e747928f85b03f48aaf227ff897d9634%1675126490.952",
"fmt/9.0.0#ca4ae2047ef0ccd7d2210d8d91bd0e02%1675126491.773"
],
"build_requires": [
"cmake/3.23.5#5f184bc602682bcea668356d75e7563b%1676913225.027"
],
"python_requires": []
}
This behavior is very important to be able to capture multiple different configurations (Linux/Windows, shared/static, Debug/Release, etc) that might have different dependency graphs. See the lockfiles tutorial, to read more about lockfiles for multiple configurations.
If we want to trim unused versions and packages we can force it with the --lockfile-clean argument:
$ conan lock create . --lockfile-clean
# will use the existing conan.lock as base, and rewrite it, cleaning unused versions
$ cat conan.lock
{
"version": "0.5",
"requires": [
"zlib/1.2.13#13c96f538b52e1600c40b88994de240f%1667396813.733",
"fmt/9.1.0#e747928f85b03f48aaf227ff897d9634%1675126490.952"
],
"build_requires": [],
"python_requires": []
}
See also
The lockfiles tutorial section has more examples and hands on explanations of lockfiles.