shithub: clone

ref: 6e62f8764bf0c3903177064b8315891ed2b8d1bf
dir: /clone.1/

.TH CLONE 1
.SH NAME
clone \- copy files and directories
.SH SYNOPSYS
.B clone
[
.B -gux
]
[
.B -b
.I blocksize
]
[
.B -p
.I fileprocs:blockprocs
]
.I from ... to
.SH DESCRIPTION
.I Clone
copies files and directories.
Similar in spirit to
.IR fcp(1)
it is a multi-process program which
relies on
.IR pread(2)
and
.IR pwrite(2)
system calls to copy multiple blocks
in parallel, speeding up the file transfer
over high-latency links;
in contrast to
.IR fcp(1)
it can copy both single files and directories,
which may be mixed on the command line.
.PP
A single file is copied as expected. If
.I to
does not exist, it is created; otherwise, an
existing file is overwritten; if
.I to
is a directory,
.I from
is copied into it.
A single directory is copied into
.I to
if it exists; otherwise, a new directory
.I to
is created and the contents of
.I from
are copied into it.
If multiple source files (directories) are given,
they are copied into the
.I to
directory, which is created if neccessary.
.PP
The
.I -x
option sets the mode and modified time of the
destination file (directory) to that of the source
file (directory); the
.I -g
and
.I -u
try to set the group and user id, respectively.
.PP
The
.I -b
option determines the size of a block that
will be transfered by a single block transfer
process (defaults to 128k).
.PP
The
.I -p
option determines the process parallelism
configuration, with
.I fileprocs
being the number of processes that handle
simultaneous file transfers, and
.I blockprocs
being the number of processes that do the
actual input / output (defaults to 4:16).
.PP
.SH SOURCE
.B https://bitbucket.org/k-vik/clone
.SH SEE ALSO
.IR fcp(1),
.IR dircp(1),
.IR pread(2),
.IR pwrite(2)
.SH BUGS
No graceful error handling.
An error encountered while copying a
single file will simply axe all the
.I clone
processes, most certainly resulting in
chaos. If there was an error, remove
the destination and start all over again.
.PP
Preserving the modification time of
directories does not work. Attributes are
cloned at directory creation time; meaning, if
there's files to be copied in this directory,
this will update the parent modification
time. Furthermore, all directories get the
forced write permission, since not having
one would mean no new file creation.