Manage data files stored outside source tree
Use this module to unambiguously reference data files stored outside the source tree and fetch them at build time from arbitrary local and remote content-addressed locations. Functions provided by this module recognize arguments with the syntax DATA{<name>}
as references to external data, replace them with full paths to local copies of those data, and create build rules to fetch and update the local copies.
For example:
include(ExternalData) set(ExternalData_URL_TEMPLATES "file:///local/%(algo)/%(hash)" "file:////host/share/%(algo)/%(hash)" "http://data.org/%(algo)/%(hash)") ExternalData_Add_Test(MyData NAME MyTest COMMAND MyExe DATA{MyInput.png} ) ExternalData_Add_Target(MyData)
When test MyTest
runs the DATA{MyInput.png}
argument will be replaced by the full path to a real instance of the data file MyInput.png
on disk. If the source tree contains a content link such as MyInput.png.md5
then the MyData
target creates a real MyInput.png
in the build tree.
ExternalData_Expand_Arguments
The ExternalData_Expand_Arguments
function evaluates DATA{}
references in its arguments and constructs a new list of arguments:
ExternalData_Expand_Arguments( <target> # Name of data management target <outVar> # Output variable [args...] # Input arguments, DATA{} allowed )
It replaces each DATA{}
reference in an argument with the full path of a real data file on disk that will exist after the <target>
builds.
ExternalData_Add_Test
The ExternalData_Add_Test
function wraps around the CMake add_test()
command but supports DATA{}
references in its arguments:
ExternalData_Add_Test( <target> # Name of data management target ... # Arguments of add_test(), DATA{} allowed )
It passes its arguments through ExternalData_Expand_Arguments
and then invokes the add_test()
command using the results.
ExternalData_Add_Target
The ExternalData_Add_Target
function creates a custom target to manage local instances of data files stored externally:
ExternalData_Add_Target( <target> # Name of data management target )
It creates custom commands in the target as necessary to make data files available for each DATA{}
reference previously evaluated by other functions provided by this module. Data files may be fetched from one of the URL templates specified in the ExternalData_URL_TEMPLATES
variable, or may be found locally in one of the paths specified in the ExternalData_OBJECT_STORES
variable.
Typically only one target is needed to manage all external data within a project. Call this function once at the end of configuration after all data references have been processed.
The following variables configure behavior. They should be set before calling any of the functions provided by this module.
ExternalData_BINARY_ROOT
The ExternalData_BINARY_ROOT
variable may be set to the directory to hold the real data files named by expanded DATA{}
references. The default is CMAKE_BINARY_DIR
. The directory layout will mirror that of content links under ExternalData_SOURCE_ROOT
.
ExternalData_CUSTOM_SCRIPT_<key>
Specify a full path to a .cmake
custom fetch script identified by <key>
in entries of the ExternalData_URL_TEMPLATES
list. See Custom Fetch Scripts.
ExternalData_LINK_CONTENT
The ExternalData_LINK_CONTENT
variable may be set to the name of a supported hash algorithm to enable automatic conversion of real data files referenced by the DATA{}
syntax into content links. For each such <file>
a content link named <file><ext>
is created. The original file is renamed to the form .ExternalData_<algo>_<hash>
to stage it for future transmission to one of the locations in the list of URL templates (by means outside the scope of this module). The data fetch rule created for the content link will use the staged object if it cannot be found using any URL template.
ExternalData_NO_SYMLINKS
The real data files named by expanded DATA{}
references may be made available under ExternalData_BINARY_ROOT
using symbolic links on some platforms. The ExternalData_NO_SYMLINKS
variable may be set to disable use of symbolic links and enable use of copies instead.
ExternalData_OBJECT_STORES
The ExternalData_OBJECT_STORES
variable may be set to a list of local directories that store objects using the layout <dir>/%(algo)/%(hash)
. These directories will be searched first for a needed object. If the object is not available in any store then it will be fetched remotely using the URL templates and added to the first local store listed. If no stores are specified the default is a location inside the build tree.
ExternalData_SERIES_PARSE
ExternalData_SERIES_PARSE_PREFIX
ExternalData_SERIES_PARSE_NUMBER
ExternalData_SERIES_PARSE_SUFFIX
ExternalData_SERIES_MATCH
ExternalData_SOURCE_ROOT
The ExternalData_SOURCE_ROOT
variable may be set to the highest source directory containing any path named by a DATA{}
reference. The default is CMAKE_SOURCE_DIR
. ExternalData_SOURCE_ROOT
and CMAKE_SOURCE_DIR
must refer to directories within a single source distribution (e.g. they come together in one tarball).
ExternalData_TIMEOUT_ABSOLUTE
The ExternalData_TIMEOUT_ABSOLUTE
variable sets the download absolute timeout, in seconds, with a default of 300
seconds. Set to 0
to disable enforcement.
ExternalData_TIMEOUT_INACTIVITY
The ExternalData_TIMEOUT_INACTIVITY
variable sets the download inactivity timeout, in seconds, with a default of 60
seconds. Set to 0
to disable enforcement.
ExternalData_URL_ALGO_<algo>_<key>
Specify a custom URL component to be substituted for URL template placeholders of the form %(algo:<key>)
, where <key>
is a valid C identifier, when fetching an object referenced via hash algorithm <algo>
. If not defined, the default URL component is just <algo>
for any <key>
.
ExternalData_URL_TEMPLATES
The ExternalData_URL_TEMPLATES
may be set to provide a list of URL templates using the placeholders %(algo)
and %(hash)
in each template. Data fetch rules try each URL template in order by substituting the hash algorithm name for %(algo)
and the hash value for %(hash)
. Alternatively one may use %(algo:<key>)
with ExternalData_URL_ALGO_<algo>_<key>
variables to gain more flexibility in remote URLs.
The DATA{}
syntax is literal and the <name>
is a full or relative path within the source tree. The source tree must contain either a real data file at <name>
or a “content link” at <name><ext>
containing a hash of the real file using a hash algorithm corresponding to <ext>
. For example, the argument DATA{img.png}
may be satisfied by either a real img.png
file in the current source directory or a img.png.md5
file containing its MD5 sum.
Multiple content links of the same name with different hash algorithms are supported (e.g. img.png.sha256
and img.png.sha1
) so long as they all correspond to the same real file. This allows objects to be fetched from sources indexed by different hash algorithms.
The DATA{}
syntax can be told to fetch a file series using the form DATA{<name>,:}
, where the :
is literal. If the source tree contains a group of files or content links named like a series then a reference to one member adds rules to fetch all of them. Although all members of a series are fetched, only the file originally named by the DATA{}
argument is substituted for it. The default configuration recognizes file series names ending with #.ext
, _#.ext
, .#.ext
, or -#.ext
where #
is a sequence of decimal digits and .ext
is any single extension. Configure it with a regex that parses <number>
and <suffix>
parts from the end of <name>
:
ExternalData_SERIES_PARSE = regex of the form (<number>)(<suffix>)$
For more complicated cases set:
ExternalData_SERIES_PARSE = regex with at least two () groups ExternalData_SERIES_PARSE_PREFIX = <prefix> regex group number, if any ExternalData_SERIES_PARSE_NUMBER = <number> regex group number ExternalData_SERIES_PARSE_SUFFIX = <suffix> regex group number
Configure series number matching with a regex that matches the <number>
part of series members named <prefix><number><suffix>
:
ExternalData_SERIES_MATCH = regex matching <number> in all series members
Note that the <suffix>
of a series does not include a hash-algorithm extension.
The DATA{}
syntax can alternatively match files associated with the named file and contained in the same directory. Associated files may be specified by options using the syntax DATA{<name>,<opt1>,<opt2>,...}
. Each option may specify one file by name or specify a regular expression to match file names using the syntax REGEX:<regex>
. For example, the arguments:
DATA{MyData/MyInput.mhd,MyInput.img} # File pair DATA{MyData/MyFrames00.png,REGEX:MyFrames[0-9]+\\.png} # Series
will pass MyInput.mha
and MyFrames00.png
on the command line but ensure that the associated files are present next to them.
The DATA{}
syntax may reference a directory using a trailing slash and a list of associated files. The form DATA{<name>/,<opt1>,<opt2>,...}
adds rules to fetch any files in the directory that match one of the associated file options. For example, the argument DATA{MyDataDir/,REGEX:.*}
will pass the full path to a MyDataDir
directory on the command line and ensure that the directory contains files corresponding to every file or content link in the MyDataDir
source directory. In order to match associated files in subdirectories, specify a RECURSE:
option, e.g. DATA{MyDataDir/,RECURSE:,REGEX:.*}
.
The following hash algorithms are supported:
%(algo) <ext> Description ------- ----- ----------- MD5 .md5 Message-Digest Algorithm 5, RFC 1321 SHA1 .sha1 US Secure Hash Algorithm 1, RFC 3174 SHA224 .sha224 US Secure Hash Algorithms, RFC 4634 SHA256 .sha256 US Secure Hash Algorithms, RFC 4634 SHA384 .sha384 US Secure Hash Algorithms, RFC 4634 SHA512 .sha512 US Secure Hash Algorithms, RFC 4634 SHA3_224 .sha3-224 Keccak SHA-3 SHA3_256 .sha3-256 Keccak SHA-3 SHA3_384 .sha3-384 Keccak SHA-3 SHA3_512 .sha3-512 Keccak SHA-3
Note that the hashes are used only for unique data identification and download verification.
When a data file must be fetched from one of the URL templates specified in the ExternalData_URL_TEMPLATES
variable, it is normally downloaded using the file(DOWNLOAD)
command. One may specify usage of a custom fetch script by using a URL template of the form ExternalDataCustomScript://<key>/<loc>
. The <key>
must be a C identifier, and the <loc>
must contain the %(algo)
and %(hash)
placeholders. A variable corresponding to the key, ExternalData_CUSTOM_SCRIPT_<key>
, must be set to the full path to a .cmake
script file. The script will be included to perform the actual fetch, and provided with the following variables:
ExternalData_CUSTOM_LOCATION
When a custom fetch script is loaded, this variable is set to the location part of the URL, which will contain the substituted hash algorithm name and content hash value.
ExternalData_CUSTOM_FILE
When a custom fetch script is loaded, this variable is set to the full path to a file in which the script must store the fetched content. The name of the file is unspecified and should not be interpreted in any way.
The custom fetch script is expected to store fetched content in the file or set a variable:
ExternalData_CUSTOM_ERROR
When a custom fetch script fails to fetch the requested content, it must set this variable to a short one-line message describing the reason for failure.
© 2000–2020 Kitware, Inc. and Contributors
Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/module/ExternalData.html