Print FastCDC rolling hash chunks and checksums.
Project description
chunksum
Print FastCDC rolling hash chunks and checksums.
Usage: chunksum <dir> [<alg_name>] [<prev_chunksums_file>]
alg_name:
Format "fc[k|m|g][0-9][sha2|blake2b|blake2s][32]".
For example, "fck4sha2", means using FastCDC("fc") with an
average chunk size of 2**8=256KB("k8") and using sha256("sha2")
to calculate the checksum.
"fcm4blake2b32" means using FastCDC with an average chunk size
of 2**4=16MB("m4") and using "blake2b" to calculate and output
a checksum of length "32" bytes(save storage).
For large files, you may using large chunk size, such as "m4",
to reduce the number of chunks.
(default: fck4sha2)
prev_chunksums_file:
You can specify the previous chunksums file if you want to
resume a previous check, or if you want to find the incremental
updates (new files) of the directory.
Examples:
$ chunksum /etc > ~/etc.chunksums
$ chunksum ~/Videos fcm4blake2b32 > ~/Videos/chunksums
$ chunksum ~/Videos fcm4blake2b32 ~/chunksums > ~/chunksums.incr
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chunksum-0.4.0.tar.gz
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