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Motivation: when gsha256sum, sha256sum and shasum are all absent but openssl
is available, install.sh fails checksum verification. The fallback ran
`openssl -dst openssl dgst -sha256`, which is an invalid command, and would
also have failed on `cut -d ' ' -f a`, an invalid field argument. The
installer exits 1 and installs nothing; checksum verification is not bypassed.
Approach: call `openssl dgst -sha256 "$TARGET"` and take the digest as the
last space-separated token of its "SHA256(file)= <digest>" output
(also "SHA2-256(...)" on OpenSSL 3.x), using POSIX parameter expansion.
Validation: added test_hash_sha256_openssl in test/install/0_checksums_test.sh,
which overrides is_command so only openssl is found and checks the digest of
the fixture archive (file and stdin). Running `sh 0_checksums_test.sh` in
test/install fails on the test before the change ("Invalid command '-dst'")
and passes after. Run on macOS with the system openssl only; the full
installer run from the issue and the container-based make targets were not run.
Report: https://github.com/anchore/syft/issues/5520
Assisted-by: claude-sonnet-5-5 (via Claude Code)
Signed-off-by: Pujitha Paladugu <10557236+pujitha24@users.noreply.github.com>
Co-authored-by: Pujitha Paladugu <10557236+pujitha24@users.noreply.github.com>