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casync is a content-addressable data synchronization tool. It can be thought up as a hybrid between git and rsync; able to store changes between files and quickly send/receive them. It is capable of operating on the block layer using raw devices and the filesystem level.


USE flags

USE flags for net-misc/casync Content-Addressable Data Synchronization Tool

fuse Enable fuse support
man Build and install man pages
selinux !!internal use only!! Security Enhanced Linux support, this must be set by the selinux profile or breakage will occur
test Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)
udev Enable virtual/udev integration (device discovery, power and storage device support, etc)


root #emerge --ask net-misc/casync



user $casync --help
casync [OPTIONS...] mkdev [BLOB|BLOB_INDEX] [NODE]

Content-Addressable Data Synchronization Tool

  -h --help                  Show this help
     --version               Show brief version information
  -v --verbose               Show terse status information during runtime
  -n --dry-run               When garbage collecting, only print what would
                             be done
     --store=PATH            The primary chunk store to use
     --extra-store=PATH      Additional chunk store to look for chunks in
                             The minimal/average/maximum number of bytes in a
     --digest=DIGEST         Pick digest algorithm (sha512-256 or sha256)
                             Pick compression algorithm (zstd, xz or gzip)
     --seed=PATH             Additional file or directory to use as seed
     --cache=PATH            Directory to use as encoder cache
  -c --cache-auto            Pick encoder cache directory automatically
     --rate-limit-bps=LIMIT  Maximum bandwidth in bytes/s for remote
     --exclude-nodump=no     Don't exclude files with chattr(1)'s +d 'nodump'
                             flag when creating archive
     --exclude-submounts=yes Exclude submounts when creating archive
     --exclude-file=no       Don't respect .caexclude files in file tree
     --reflink=no            Don't create reflinks from seeds when extracting
     --hardlink=yes          Create hardlinks from seeds when extracting
     --punch-holes=no        Don't create sparse files when extracting
     --delete=no             Don't delete existing files not listed in archive
                             after extraction
     --undo-immutable=yes    When removing existing files, undo chattr(1)'s +i
                             'immutable' flag when extracting
     --seed-output=no        Don't implicitly add pre-existing output as seed
                             when extracting
     --recursive=no          List non-recursively
     --mkdir=no              Don't automatically create mount directory if it
                             is missing
     --uid-shift=yes|SHIFT   Shift UIDs/GIDs
     --uid-range=RANGE       Restrict UIDs/GIDs to range

Input/output selector:
     --what=archive          Operate on archive file
     --what=archive-index    Operate on archive index file
     --what=blob             Operate on blob file
     --what=blob-index       Operate on blob index file
     --what=directory        Operate on directory

     --what=help             Print allowed values

Archive feature sets:
     --with=best             Store most accurate information
     --with=unix             Store UNIX baseline information
     --with=fat              Store FAT information
     --with=chattr           Store chattr(1) file attributes
     --with=fat-attrs        Store FAT file attributes
     --with=privileged       Store file data that requires privileges to
     --with=fuse             Store file data that can exposed again via
                             'casync mount'
     (and similar: --without=fat-attrs, --without=privileged, ...)
     --without=all           Disable all optional attributes

Individual archive features:
     --with=16bit-uids       Store reduced 16bit UID/GID information
     --with=32bit-uids       Store full 32bit UID/GID information
     --with=user-names       Store user and group names
     --with=sec-time         Store timestamps with 1s granularity
     --with=usec-time        Store timestamps with 1µs granularity
     --with=nsec-time        Store timestamps with 1ns granularity
     --with=2sec-time        Store timestamps with 2s granularity
     --with=read-only        Store per-file read only flag
     --with=permissions      Store full per-file UNIX permissions
     --with=symlinks         Store symbolic links
     --with=device-nodes     Store block and character device nodes
     --with=fifos            Store named pipe nodes
     --with=sockets          Store AF_UNIX file system socket nodes
     --with=flag-hidden      Store FAT "hidden" file flag
     --with=flag-system      Store FAT "system" file flag
     --with=flag-archive     Store FAT "archive" file flag
     --with=flag-append      Store "append-only" file flag
     --with=flag-noatime     Store "disable access time" file flag
     --with=flag-compr       Store "enable compression" file flag
     --with=flag-nocow       Store "disable copy-on-write" file flag
     --with=flag-nodump      Store "disable dumping" file flag
     --with=flag-dirsync     Store "synchronous" directory flag
     --with=flag-immutable   Store "immutable" file flag
     --with=flag-sync        Store "synchronous" file flag
     --with=flag-nocomp      Store "disable compression" file flag
     --with=flag-projinherit Store "project quota inheritance" flag
     --with=subvolume        Store btrfs subvolume information
     --with=subvolume-ro     Store btrfs subvolume read-only property
     --with=xattrs           Store extended file attributes
     --with=acl              Store file access control lists
     --with=selinux          Store SELinux file labels
     --with=fcaps            Store file capabilities
     --with=quota-projid     Store ext4/XFS quota project ID
     (and similar: --without=16bit-uids, --without=32bit-uids, ...)



root #emerge --ask --depclean --verbose net-misc/casync

See also

  • Systemd — a modern SysV-style init and rc replacement for Linux systems.
  • Rsync — a powerful file sync program capable of efficient file transfers and directory synchronization.
  • Git — distributed revision control and source code management tool.
  • Tar — an archiver tool that provides the ability to create tar archives, as well as various other kinds of manipulation.