miller/test/cases/verb-split/0009/postcmp
John Kerl 9910351ca1
Copy records handed to async file-writers in tee and split verbs (#1671) (#2152)
The tee verb passed the same record pointer both to its file-output
handler (which writes asynchronously on another goroutine, and whose
buffering formats like pprint/json can hold records until close) and
downstream in the verb chain, where subsequent verbs mutate records in
place. Downstream mutations could therefore leak into the tee'd output:

  mlr tee -p cat then cat -n then nothing <<EOF
  a=1,b=2
  a=3,b=4
  a=5,b=6
  EOF

emitted "n=3,a=5,b=6" for the last tee'd record, and with pprint/json
tee formats every record picked up downstream fields.

Fix: give the file-writer its own deep copy of the record. Same fix
applied to the split verb when -v (emit downstream) is used, which
shared records with downstream the same way.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
2026-07-05 20:17:32 -04:00

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${CASEDIR}/split_1.pprint.expect ${CASEDIR}/split_1.pprint
${CASEDIR}/split_2.pprint.expect ${CASEDIR}/split_2.pprint