This seems to be related to my previous question where there was a ghostscript bug and thus ImageMagick devs made a security policy blocking PDF conversion. This was overcome by adjusting the policy file such that rights changed from "none" (by default) to "read | write"
My similar problem is initiated when running a command of the form
convert input.pdf output.jpg
Now with ghostscript version 9.27 (2019-04-04) and imagemagick version 7.0.8-56 Q16 x86_64 (2019-07-21) (I believe this is the newest version of each), I get this error
convert: attempt to perform an operation not allowed by the security policy `gs' @ error/delegate.c/ExternalDelegateCommand/378.
convert: no images defined `output.jpg' @ error/convert.c/ConvertImageCommand/3273.
So I have sudoedited /etc/ImageMagick-7/policy.xml such that the only uncommented lines in the <policymap> are changed from
<policy domain="delegate" rights="none" pattern="gs" />
to
<policy domain="coder" rights="read | write" pattern="PDF" />
<policy domain="delegate" rights="read | write" pattern="gs" />
but the problem persists. Equivalent results if simply commenting out or deleting the above line. This is reproducible on more than one of my Arch machines.
Is there a way to bypass this security policy default? Is it safe to do so?
Best Answer
needs to be commented out. This is now noted on the imagemagick page of the arch wiki. That page currently cites these bug reports: FS#59778, FS#62171
For some reason, this didn't immediately work for me. Somehow I got it to work today by moving policy.xml to a backup (deleting), running the convert command, and moving back the original with the line above commented out.