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condor_chirp
Access files or job ClassAd from an executing job
condor_chirp
<Chirp-Command>
Description
condor_chirp is not intended for use as a command-line tool.
It is most often invoked by an HTCondor job, while the job is executing.
It accesses files or job ClassAd attributes on the submit machine.
Files can be read, written or removed.
Job attributes can be read, and most attributes can be updated.
When invoked by an HTCondor job,
the command-line arguments describe the operation to be performed.
Each of these arguments is described below within the section
on Chirp Commands.
Descriptions using the terms local and remote
are given from the point of view of the executing job.
If the input file name for put or write is a dash,
condor_chirp uses standard input as the source.
If the output file name for fetch is a dash,
condor_chirp writes to standard output instead of a local file.
Jobs that use condor_chirp must have the attribute
WantIOProxy set to True in the job ClassAd.
To do this, place
+WantIOProxy = true
in the submit description file of the job.
condor_chirp only works for jobs run in the
vanilla, parallel and java universes.
- fetch RemoteFileName LocalFileName
- Copy the RemoteFileName from the submit machine
to the execute machine, naming it LocalFileName.
- put [-mode mode] [-perm UnixPerm] LocalFileName RemoteFileName
- Copy the LocalFileName from the execute machine
to the submit machine, naming it RemoteFileName.
The optional -perm UnixPerm argument describes the file access
permissions in a Unix format; 660 is an example Unix format.
The optional -mode mode argument is one or more of
the following characters describing the RemoteFileName file:
w, open for writing;
a, force all writes to append;
t, truncate before use;
c, create the file, if it does not exist;
x, fail if c is given and the file already exists.
- remove RemoteFileName
- Remove the RemoteFileName file from the submit machine.
- get_job_attr JobAttributeName
- Prints the named job ClassAd attribute to standard output.
- set_job_attr JobAttributeName AttributeValue
- Sets the named job ClassAd attribute with the given attribute value.
- ulog Message
- Appends Message to the job event log.
- read [-offset offset] [-stride length skip] RemoteFileName Length
- Read Length bytes from RemoteFileName. Optionally,
implement a stride by
starting the read at offset and reading length bytes
with a stride of skip bytes.
- write [-offset offset] [-stride length skip] RemoteFileName LocalFileName [numbytes]
- Write the contents of LocalFileName to RemoteFileName.
Optionally, start writing to the remote file at offset and write
length bytes with a stride of skip bytes. If the optional
numbytes follows LocalFileName, then the
write will halt after numbytes input bytes have been written.
Otherwise, the entire contents of LocalFileName will be written.
- rmdir [-r] RemotePath
- Delete the directory specified by RemotePath.
If the optional -r is specified,
recursively delete the entire directory.
- getdir [-l] RemotePath
- List the contents of the directory specified by RemotePath.
If -l is specified, list all metadata as well.
- whoami
- Get the user's current identity.
- whoareyou RemoteHost
- Get the identity of RemoteHost.
- link [-s] OldRemotePath NewRemotePath
- Create a hard link from OldRemotePath to NewRemotePath.
If the optional -s is specified, create a symbolic link instead.
- readlink RemoteFileName
- Read the contents of the file defined by the symbolic link
RemoteFileName.
- stat RemotePath
- Get metadata for RemotePath. Examines the target,
if it is a symbolic link.
- lstat RemotePath
- Get metadata for RemotePath. Examines the file,
if it is a symbolic link.
- statfs RemotePath
- Get file system metadata for RemotePath.
- access RemotePath Mode
- Check access permissions for RemotePath.
Mode is one or more of the characters r, w,
x, or f, representing read, write, execute, and
existence, respectively.
- chmod RemotePath UnixPerm
- Change the permissions of RemotePath to UnixPerm.
UnixPerm describes the file access permissions in a Unix format;
660 is an example Unix format.
- chown RemotePath UID GID
- Change the ownership of RemotePath to UID and GID.
Changes the target of RemotePath, if it is a symbolic link.
- chown RemotePath UID GID
- Change the ownership of RemotePath to UID and GID.
Changes the link, if RemotePath is a symbolic link.
- truncate RemoteFileName Length
- Truncates RemoteFileName to Length bytes.
- utime RemotePath AccessTime ModifyTime
- Change the access to AccessTime and modification time
to ModifyTime of RemotePath.
To copy a file from the submit machine to the execute machine while the
user job is running, run
condor_chirp fetch remotefile localfile
To print to standard output the value of the Requirements
expression from within a running job, run
condor_chirp get_job_attr Requirements
Note that the remote (submit-side) directory path is relative to the
submit directory, and the local (execute-side) directory is relative to the
current directory of the running program.
To append the word "foo" to a file called RemoteFile
on the submit machine, run
echo foo | condor_chirp put -mode wa - RemoteFile
To append the message "Hello World" to the job event log, run
condor_chirp ulog "Hello World"
condor_chirp will exit with a status value of 0 (zero) upon success,
and it will exit with the value 1 (one) upon failure.
Center for High Throughput Computing, University of Wisconsin-Madison
Copyright © 1990-2013 Center for High Throughput Computing,
Computer Sciences Department,
University of Wisconsin-Madison, Madison, WI. All Rights Reserved.
Licensed under the Apache License, Version 2.0.
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