VENTI(1) VENTI(1)
NAME
read, write, copy - simple Venti clients
SYNOPSIS
venti/read [ -h host ] [ -t type ] score
venti/write [ -z ] [ -h host ] [ -t type ]
venti/copy [ -fir ] [ -t type ] srchost dsthost score [ type
]
DESCRIPTION
Venti is a SHA1-addressed block storage server. See
venti(6) for a full introduction.
Read reads a block with the given score and numeric type
from the server host and prints the block to standard out-
put. If the -h option is omitted, read consults the envi-
ronment variable $venti for the name of the Venti server.
If the -t option is omitted, read will try each type, one at
a time, until it finds one that works. It prints the corre-
sponding read -t command to standard error to indicate the
type of the block.
Write writes at most 56 kilobytes of data from standard
input to the server host and prints the resulting score to
standard output. If the -t option is omitted, write uses
type 0, denoting a data block. If the -z option is given,
write zero truncates the block before writing it to the
server.
Copy expects score to be the score of a VtRoot block. It
copies the entire tree of blocks reachable from the root
block from the server srchost to the server dsthost.
The -f option causes copy to run in `fast' mode, assuming
that if a block already exists on the destination Venti
server, all its children also exist and need not be checked.
The -i and -r options control copy's reaction to errors
reading from srchost. Copy always prints information to
standard error about each read error. By default, copy
exits after printing the first error. If the -i option is
given, read errors are ignored. This is dangerous behavior
because it breaks the assumption made by `fast' mode. If
the -r option is given, copy replaces pointers to unreadable
blocks with pointers to the zero block. It writes the new
root score to standard output.
SOURCE
/sys/src/cmd/venti
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VENTI(1) VENTI(1)
SEE ALSO
vac(1), venti(2), vacfs(4), venti(6), venti(8), venti-
backup(8), venti-fmt(8)
BUGS
There should be programs to read and write venti files and
directories.
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