Remotely calculate SHA256 of files where file name is [0-9a-f]{64} to see if file name == hash of file (e.g. restic, rsync.net)

sha256remote.sh

#!/bin/bash
set -Efeuo pipefail

SSH='ssh user@server'
DIR='/remote/path'

#assumes that "find" and "sha256 -r" commands work on the remote machine

#count files to show live counter
file_count="$($SSH "find $(printf %q "$DIR") -type f" | grep -E '/[0-9a-f]{64}$'|wc -l)"

# hash files remotely and check
$SSH "find $(printf %q "$DIR") -type f -exec sha256 -r {} +" \
| awk -v file_count="$file_count" '
    $2 ~ /\/[0-9a-f]{64}$/ {
        split($2, parts, "/")
        fname = parts[length(parts)]
        i++

        # live counter
        printf "\r%u/%u", i, file_count > "/dev/stderr"

        # report hash mismatch
        if ($1 != fname) {
            printf "\nBAD: %s (should be %s)\n", $2, $1
            fail++
        }
    }
    END {
        printf "\nFinished: %u files checked. %u files mismatch.\n", i, fail > "/dev/stderr"
    }
'