runs and then finishes immediately

[rxng]

running the command seems to succeed, but also immediate exists and does nothing. is there an error with split() takes no keyword arguments?

how can btrfs send and receive be instantaneous and not result in anything happening?

sudo ./btrfs-clone / /mnt/btrfsvol --verbose                                                                              
unsharing mount namespace
OLD btrfs d829ec00-0ae0-4466-b3bf-6faa103ee153 mounted on /tmp/tmpcCcC_m
NEW btrfs 1c0fabd8-bac3-418d-a792-5beb7f241668 mounted on /tmp/tmpw4vPo3
Create readonly snapshot of '/tmp/tmpcCcC_m' in '/tmp/tmpcCcC_m/84c5b7516507'
btrfs send -v /tmp/tmpcCcC_m/84c5b7516507 |
         btrfs receive -v /tmp/tmpw4vPo3
btrfs property set -f /tmp/tmpw4vPo3/84c5b7516507 ro false
btrfs subvolume delete /tmp/tmpw4vPo3/84c5b7516507
Delete subvolume 257 (no-commit): '/tmp/tmpw4vPo3/84c5b7516507'
Using cloning strategy GenerationStrategy
split() takes no keyword arguments
Delete subvolume 1984 (no-commit): '/tmp/tmpcCcC_m/84c5b7516507'

[mwilck]

btrfs-clone is a just driver script for btrfs send/receive. You can try using --verbose, but if anything goes wrong at that level (which basically means: kernel level), you may need to run the tools manually (you can obtain the command line params from btrfs-clone output) and inspect more closely what's going on.