A collection of scripts for downloading/uploading and listing data from XNAT repositories.
Xnat-utils is a collection of scripts for conveniently up/downloading and listing data on/from XNAT.
The following converters are required for automatic conversions of downloaded images (using the ‘–convert_to’ and ‘–converter’ options)
Install Python (>=3.4)
macOS ships with it’s own, slightly modified, version of Python, which it uses in some applications/services. For the most part it is okay for general use but in some cases, such as with xnat-utils, the modifications can cause problems. To avoid these I recommend installing an unmodified version of Python for use in your scientific programs using Homebrew (http://brew.sh). To do this first install Homebrew:
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
then install Python with:
brew install python3
If everything has gone well, when you type:
it should come back with:
If it doesn’t or your run into any problems follow the instructions you receive when you run:
Note that these instructions are just recommendations so you don’t have to follow all of them, just the ones that are likely to be related to your problem.
Download the version of Python for Windows using the most appropriate installer for Python (>=3.4), here https://www.python.org/downloads/windows/.
Python is most likely already installed but if it isn’t it is best to install it using your package manager.
Pip is probably already be installed by default with your Python package so check whether it is installed first:
Noting that it should be in /usr/local/bin if you are using Homebrew on macOS.
If pip is not installed you can install it by downloading the following script, https://bootstrap.pypa.io/get-pip.py and:
Install XnatUtils package
The XnatUtils source code can be downloaded (or cloned using git) from https://github.com/MonashBI/xnatutils.git. To install it cd to to the directory you have downloaded and run:
pip3 install xnatutils
If you get permission denied errors and you may need to use sudo, or if you don’t have admin access to the box then you can install it in your user directory with the --user flag.:
pip3 install --user xnatutils
which should install XnatPy for you. If pip is not installed you should can install it with easy_install pip (you may need to use sudo for both these commands).
I have had some difficulty with the installation of progressbar2 as there is a conflict with the progressbar package (they both produce packages called progressbar). In this case it is probably a good idea to install xnat-utils in a virtual environment (https://virtualenv.readthedocs.io/en/latest/).
The first time you use one of the utilities you will be prompted for the address of the server would like to connect to, in addition to your username and password. By default a alias token for these credentials will be stored in a ~/.netrc file with the following format (with permissions set to 600 on the file):
machine <your-server-url> user <your-alias-token> password <your-alias-secret>
If you don’t want these credentials stored, then pass the ‘–no_netrc’ (or ‘-n’) option.
If you have saved your credentials in the ~/.netrc file, subsequent calls won’t require you to provide the server address or username/password until the token expires (if you don’t want deal with expiring tokens you can just save your username/password in the ~/.netrc file instead, however, please be careful with important passwords). To reset the saved credentials provide --server option again with the full server address including the protocol (e.g. ‘https://’) or edit the ~/.netrc file directly.
To connect to an additional XNAT server, provide the new server address via the --server option. Credentials for this server will be saved alongside the credentials for your previously saved servers. If the --server option is not provided the first server in the file will be used. To used the save credentials for a secondary server you only need to provide as of the secondary server address to --server to distinguish it from the other saved servers. For example given the following saved credentials in a ~/.netrc file:
machine xnat.myuni.edu user myusername password mypassword machine xnat-dev.myuni.edu user mydevusername password mydevpassword
$ xnat-ls -s dev MYPROJECT
will be enough to select the development server from the saved credentials list.
Six commands will be installed
- xnat-get - download scans and resources
- xnat-put - upload scans and resources (requires write privileges to project)
- xnat-ls - list projects/subjects/sessions/scans
- xnat-rename - renames an XNAT session
- xnat-varget - set a metadata field (including “custom variables”)
- xnat-varput - retrieve a metadata field (including “custom variables”)
Please see the help for each tool by passing it the ‘-h’ option.
Help on Regular Expressions
The regular expression syntax used by xnat-get and xnat-ls is fully defined here, https://docs.python.org/2/library/re.html. However, for most basic use cases you will probably only need to use the ‘.’ and ‘*’ operators.
‘.’ matches any character so the pattern:
MRH060_001_MR01 MRH060_002_MR01 MRH060_003_MR01 MRH060_004_MR01 MRH060_005_MR01 MRH060_006_MR01 MRH060_007_MR01 MRH060_008_MR01 MRH060_009_MR01
The ‘*’ matches 0 or more repeats of the previous character, which is most useful in conjunction with the ‘.’ character to match string of wildcard characters, e.g.:
will match all subjects/sessions in the MRH060 project.
Note, that when using regular expressions that use ‘*’ on the command line you will need to enclose them in single quotes to avoid the default wilcard file search, e.g.:
$ xnat-ls 'MRH099.*'
Probably the only other syntax that will prove useful is the ‘(option1|option2|…)’. For example:
MRH060_001_MR01 MRH060_002_MR01 MRH060_003_MR01
For more advanced syntax please refer to the numerous tutorials on regular expressions online.
Release history Release notifications
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