term% cat index.txt VENTI(1) General Commands Manual 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 output. If the -h option
is omitted, read consults the environment 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 cor‐
responding 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 sr‐
chost 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 be‐
havior 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
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.
VENTI(1)