/usr/lib/rpm/script.req is in rpm 4.12.0.1+dfsg1-3build3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #!/bin/sh
# TODO: handle "#!/usr/bin/env foo" somehow
while read filename; do
# common cases
sed -n -e '1s:^#![[:space:]]*\(/[^[:space:]]\{1,\}\).*:\1:p' "$filename"
#!/usr/bin/env /foo/bar
sed -n -e '1s:^#![[:space:]]*[^[:space:]]*/bin/env[[:space:]]\{1,\}\(/[^[:space:]]\{1,\}\):\1:p' "$filename"
done
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