$ docker run --rm --name validator-libpng-usage-netpbm-pngtopam-alpha-only-png-2710 -t --mount type=bind,src=/tmp/validator-status-libpng-usage-netpbm-pngtopam-alpha-only-png,dst=/validator/status validator-libpng-shared bash -lc 'set -euo pipefail
/validator/tests/_shared/install_override_debs.sh
exec /validator/tests/_shared/run_library_tests.sh "$@"' validator-testcase libpng usage-netpbm-pngtopam-alpha-only-png -- bash -c 'PS4=$1; shift; set -x; source "$@"' validator-xtrace '__VALIDATOR_XTRACE__ ' /validator/tests/libpng/tests/cases/usage/usage-netpbm-pngtopam-alpha-only-png.sh
no override packages found; continuing with apt originals
pamstack: Writing 4 channel PAM image
/tmp/validator-tmp/rgba.png: PNG image data, 4 x 2, 8-bit/color RGBA, non-interlaced
/tmp/validator-tmp/alpha.pgm:	PGM raw, 4 by 2  maxval 255