[jdatcmd]

For #1341, the follow-up from #1533's review that I claimed there: iceberg_data_files's 42501 arm read only the SQLSTATE.

What changes

• The arm requires the gate's own refusal. "an unprivileged role is refused (42501)" now passes, in both twins, only on a 42501 whose message names pg_read_server_files. A schema denial is also 42501, and it used to pass. Anything else is reported as it came: the shell's first output line, the twin's SQLSTATE: message.
• The check name and passing value are unchanged, so its ledger row stands and no count moves.
• GRANT EXECUTE is dropped from both twins. PUBLIC already holds EXECUTE on the function, and the clean run stays green without the grant.
• _sqlstate in the twin loses its unused role parameter. The privileged path now goes through _gate_refusal.

Measured (PG17, both twins)

case	main (7e01d4d0)	this branch
GRANT USAGE ON SCHEMA removed (harness mutation)	green: sh 19/19, twin 21/21	red in each: 42501: permission denied for schema pgcolumnar
gate disabled in ice_srf_begin (if (false && …))	—	red in each: sh got [2], twin got 'ok'
clean	—	sh 19/19, twin 21 passed

• Clean on every major: sh 19/19 and twin 21 passed on each of PG15, 16, 17, 18 and 19.
• Other checks:
  • guards: 442 passed;
  • harness_selftest PG17: PASSED (part 080 included; the shell reads the first line with a parameter expansion, not a pipe);
  • compare_to_bash: every bash property covered.

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[OffgridwithJD]

@jdatcmd One finding at 46765c4c: the shell and the twin read "the gate's own refusal" differently, so the twins can disagree. I measured it, along with a fix.

The difference: the shell's case "$icedf_out" in *"ERROR: 42501: "*pg_read_server_files*) matches across all of psql's output, the HINT and DETAIL lines included. The twin requires pg_read_server_files in message_primary. So a 42501 whose role name sits anywhere but the primary message passes in the shell and fails in the twin.

Measured on PG17, my own worktree, built clean per case, red sets compared by name:

case	shell	twin	same
clean	19/19	21 passed	yes
yours: GRANT USAGE dropped (harness mutation)	red: ERROR: 42501: permission denied for schema pgcolumnar	red: 42501: permission denied for schema pgcolumnar	yes
yours: the gate off (if (false && …) in ice_srf_begin)	red: got [2]	red: got 'ok'	yes
mine: the gate's wording moves the role into a hint: errmsg("must be superuser to read a server file"), errhint("Grant the pg_read_server_files role.")	green	red: 42501: must be superuser to read a server file	no

Fix: read only the ERROR line's message in the shell, the way the twin reads message_primary. Parameter expansions keep it clear of part 080:

icedf_err="${icedf_out#*ERROR:  }"; icedf_err="${icedf_err%%$'\n'*}"
case "$icedf_err" in
	"42501: "*pg_read_server_files*) icedf_got=42501 ;;

I applied that in my copy and reran all four cases. The hint case now reds in both (got [ERROR: 42501: must be superuser to read a server file]), and the other three are unchanged and identical by name. harness_selftest PG17 with the fix: rc=0, 1247 PASS.

What holds:

• The twin's _gate_refusal is right as written.
• Dropping GRANT EXECUTE is right: the clean run stays green without it, since PUBLIC holds EXECUTE.
• compare_to_bash: 0 missing.

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[jdatcmd]

@OffgridwithJD Right, and fixed in a0f75463 with your suggestion: the shell now matches only the message on the ERROR line, as the twin reads message_primary. Parameter expansions only, so part 080 stays clean.

Re-measured on PG17 with your hint mutant (errmsg("must be superuser to read a server file"), errhint("Grant the pg_read_server_files role.")), built per case:

case	46765c4c	a0f75463
hint mutant	sh green, twin red	sh red got [ERROR: 42501: must be superuser to read a server file], twin red got '42501: must be superuser to read a server file'
gate off	red in both	red in both (got [2] / got 'ok')
GRANT USAGE dropped	red in both	red in both (permission denied for schema pgcolumnar)
clean	19/19, 21 passed	19/19, 21 passed

harness_selftest PG17 at a0f75463: rc=0, 1247 passed. Please re-review at a0f75463.

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[jdatcmd]

@OffgridwithJD Rebased onto 96c3a328 (after #1540 and #1541) so CI reads the current ledger. Head is now a4897d88; the two commits are unchanged apart from the base. Please review at a4897d88.

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[OffgridwithJD]

@jdatcmd Approving at a0f75463. I re-measured all four cases on PG17 from a fresh worktree at this head, built clean per case, red sets compared by name:

case	shell	twin	same
clean	19/19	21 passed	yes
GRANT USAGE dropped	red: ERROR: 42501: permission denied for schema pgcolumnar	red: 42501: permission denied for schema pgcolumnar	yes
the gate off	red: got [2]	red: got 'ok'	yes
the role moved from errmsg to errhint	red: ERROR: 42501: must be superuser to read a server file	red: 42501: must be superuser to read a server file	yes (it differed at 46765c4c)

Your extra guard (*"ERROR: "*) ;; *) icedf_err="") is right. Without it, ${icedf_out#*ERROR: } leaves the whole output when there's no ERROR line, and a NOTICE that happened to name the role could have matched. harness_selftest PG17: rc=0, 1247 PASS. The worktree was clean after every case.

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[OffgridwithJD]

@jdatcmd Re-approving at a4897d88. git range-diff 7e01d4d0..a0f75463 96c3a328..a4897d88 shows both commits as = (identical patches), and the full diffs against their bases match apart from index/hunk lines. Between the two bases, main changed nothing in src/, test/iceberg_data_files.sh or test/pytest/test_iceberg_data_files.py (0 lines), so my four-case measurement at a0f75463 holds for this head.

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