NAME

       parrot_run - run a program in the Parrot virtual file system

SYNOPSIS

       parrot_run [parrot_options] program [program_options]

DESCRIPTION

       parrot_run  runs  an  application or a shell inside the Parrot virtual filesystem.  Parrot
       redirects the application's system calls to  remote  storage  systems.   Parrot  currently
       supports  the  following  remote  storage  systems: HTTP, GROW, FTP, GridFTP, iRODS, HDFS,
       XRootd, Chirp.  This list may vary depending on how Parrot was built.  Run  parrot  -h  to
       see exactly what support is available on your system.

       Parrot  works  by  trapping  the  application's  system calls through the ptrace debugging
       interface.  It does not require any special privileges to install or run, so it is  useful
       to  ordinary  users  that  wish  to  access  data  across  wide area networks.  The ptrace
       debugging interface does have some cost, so applications may run slower, depending on  how
       many I/O operations they perform.

       For    complete    details    with    examples,    see    the    Parrot    User's   Manual
       (http://ccl.cse.nd.edu/software/manuals/parrot.html)

OPTIONS

        --check-driver <driver>
               Check for the presence of a given driver (e.g. http, ftp, etc) and return  success
              if it is currently enabled.

       -a, --chirp-auth=<unix|hostname|ticket|globus|kerberos>
              Use  this Chirp authentication method.  May be invoked multiple times to indicate a
              preferred list, in order.

       -b, --block-size=<bytes>
              Set the I/O block size hint.

       -c, --status-file=<file>
              Print exit status information to file.

        -C    Enable data channel authentication in GridFTP.

       -d, --debug=<flag>
              Enable debugging for this sub-system.

        -D    Disable small file optimizations.

        --dynamic-mounts
               Enable the use of parot_mount in this session.

        -F    Enable file snapshot caching for all protocols.

        -f    Disable following symlinks.

       -G, --gid=<num>
              Fake this gid; Real gid stays the same.

        -h    Show this screen.

        --helper
              Enable use of helper library.

       -i, --tickets=<files>
              Comma-delimited list of tickets to use for authentication.

       -I, --debug-level-irods=<num>
              Set the iRODS driver internal debug level.

        -K    Checksum files where available.

        -k    Do not checksum files.

       -l, --ld-path=<path>
              Path to ld.so to use.

       -m, --ftab-file=<file>
              Use this file as a mountlist.

       -M, --mount=</foo=/bar>
              Mount (redirect) /foo to /bar.

       -e, --env-list=<path>
              Record the environment variables.

       -n, --name-list=<path>
              Record all the file names.

        --no-set-foreground
              Disable changing the foreground process group of the session.

       -N, --hostname=<name>
              Pretend that this is my hostname.

       -o, --debug-file=<file>
              Write debugging output to this file.  By  default,  debugging  is  sent  to  stderr
              (":stderr").  You  may  specify  logs  be sent to stdout (":stdout"), to the system
              syslog (":syslog"), or to the systemd journal (":journal").

       -O, --debug-rotate-max=<bytes>
              Rotate debug files of this size.

       -p, --proxy=<host:port>
              Use this proxy server for HTTP requests.

        -Q    Inhibit catalog queries to list /chirp.

       -r, --cvmfs-repos=<repos>
              CVMFS repositories to enable (PARROT_CVMFS_REPO).

        --cvmfs-repo-switching
               Allow repository switching with CVMFS.

       -R, --root-checksum=<cksum>
              Enforce this root filesystem checksum, where available.

        -s    Use streaming protocols without caching.

        -S    Enable whole session caching for all protocols.

        --syscall-disable-debug
              Disable tracee access to the Parrot debug syscall.

       -t, --tempdir=<dir>
              Where to store temporary files.

       -T, --timeout=<time>
              Maximum amount of time to retry failures.  time)Maximum amount  of  time  to  retry
              failures.

        --time-stop
               Stop virtual time at midnight, Jan 1st, 2001 UTC.

        --time-warp
               Warp virtual time starting from midnight, Jan 1st, 2001 UTC.

       -U, --uid=<num>
              Fake this unix uid; Real uid stays the same.

       -u, --username=<name>
              Use this extended username.

        --fake-setuid
              Track changes from setuid and setgid.

        --valgrind
              Enable valgrind support for Parrot.

        -v    Display version number.

        --is-running
              Test is Parrot is already running.

       -w, --work-dir=<dir>
              Initial working directory.

        -W    Display table of system calls trapped.

        -Y    Force synchronous disk writes.

        -Z    Enable automatic decompression on .gz files.

        --disable-service <service>
               Disable a compiled-in service (e.g. http, cvmfs, etc.)

ENVIRONMENT VARIABLES

       parrot_run  sets  the  environment  variable  PARROT_ENABLED  to the value 1 for its child
       processes.  This makes it possible to set  a  visible  flag  in  your  shell  prompt  when
       parrot_run is enabled.

EXIT STATUS

       parrot_run  returns  the exit status of the process that it runs.  If parrot_run is unable
       to start the process, it will return non-zero.

EXAMPLES

       To access a single remote file using vi:

               % parrot_run vi /anonftp/ftp.gnu.org/pub/README

       You can also run an entire shell inside of Parrot, like this:

               % parrot_run bash
               % cd /anonftp/ftp.gnu.org/pub
               % ls -la
               % cat README
               % exit

       To see the list of available Chirp servers around the world:

               % parrot_run ls -la /chirp

       Parrot can record the names of all the accessed files and the environment variables during
       the execution process of one program, like this:

               % parrot_run --name-list list.txt --env-list envlist ls ~

       The  environment  variables  at  the starting moment of your program will be recorded into
       envlist. The absolute paths of all the accessed  files,  together  with  the  system  call
       types, will be recorded into list.txt. For example, the file /usr/bin/ls is accessed using
       the stat system call, like this:

               % /usr/bin/ls|stat

NOTES ON DOCKER

       Docker by default blocks ptrace, the system call on which parrot  relies.  To  run  parrot
       inside   docker,   the   container   needs   to   be   started  using  the  --security-opt
       seccomp=unconfined command line argument. For example:

                   docker run --security-opt seccomp=unconfined MY-DOCKER-IMAGE

COPYRIGHT

       The Cooperative Computing Tools are Copyright (C) 2003-2004 Douglas  Thain  and  Copyright
       (C)  2005-2015  The  University of Notre Dame.  This software is distributed under the GNU
       General Public License.  See the file COPYING for details.

SEE ALSO

       •   Cooperative Computing Tools Documentation

       •   Parrot User Manual

       •   parrot_run(1)  parrot_run_hdfs(1)  parrot_cp(1)   parrot_getacl(1)    parrot_setacl(1)
           parrot_mkalloc(1)       parrot_lsalloc(1)      parrot_locate(1)      parrot_timeout(1)
           parrot_whoami(1)      parrot_mount(1)      parrot_md5(1)      parrot_package_create(1)
           parrot_package_run(1)  chroot_package_run(1)