REPL(1) REPL(1)
NAME
new, sync, scan - peer to peer replica management
SYNOPSIS
repl/new repl id dir [ excldir... ]
repl/sync [ -N ] [ -12lrn ] repl1 repl2 [ dir... ]
repl/scan repl
DESCRIPTION
These programs provide a simplified user interface to the
peer-to-peer replica management system described in repl(8).
Each peer is called a replica and holds a replicated file
tree. Any number of replicas can be defined and any pair
can be synchronized at any time. There is no centralized
server nor there is a synchronization order required to
detect conflicts.
Each replica is described by a simple rc(1) script that
identifies the file tree and related repl(8) information.
The programs try to find configuration files at
$home/lib/repl and /lib/repl unless a path is supplied.
New defines a new replica repl for the given directory,
using the given identifier. The identifier must be a lower
case letter and must be unique for each peer of a replicated
tree. The file repl created by the script is used later as
an argument for sync and scan. The optional excldir argu-
ments are directories excluded from dir for replication pur-
poses. See the examples below.
Sync synchronizes changes between replicas. Replicas are
identified by the configuration files created by new. Before
synchronizing, sync scans both file trees for changes unless
flag -N is given. Scan can be performed separately by using
the scan script. If any dir is supplied, relative to the
top-dir of a replica, synchronization applies only to it.
Sync flag -n performs a dry run to report changes between
both replicas without synchronizing them (scan is still per-
formed for both). The flag -l can be used to synchronize
just the left replica (in command line order) with respect
to the other. Flag -r does the same for the right replica.
Flags -1 and -2 can be used to resolve conflicts in favor of
the first replica (the left one) and in favor of the second
one (the right one). When there are different conflicts to
be gained by different replicas, one replica can be updated
by hand, and then used as the prefered to settle down all
the conflicts.
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REPL(1) REPL(1)
EXAMPLE
This defines for the system file tree, excluding /usr and
/dist, a replica called a. Then we define another replica
called b for a laptop.
; repl/new /dist/sys a /root /usr /dist
replica /dist/sys defined.
; repl/new /dist/laptop b /fossil /usr /dist
replica /dist/laptop defined.
Synchronice the laptop resolving any conflict in favor of
the system
; repl/sync -r1 /dist/sys /dist/laptop
SOURCE
/sys/src/cmd/repl
SEE ALSO
repl(8), replica(1).
BUGS
Append only files are not synchronized to prevent duplica-
tion of file contents.
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