toolexec: Add required-packages flag #116
Merged
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toolexec mode only rewrites packages that have import the errtrace
package, and others are silently ignored which can lead to unintended
missed rewrites.
Accept package selectors of packages that must import errtrace if a
rewrite is required.
Most of this change is setting up the machinery for toolexec flags:
we know we're in toolexec mode.
cached output may not be valid when flags change. E.g., a previous
package success should fail if the required-packages flag changes and
it contains a package that needs a rewrite but is missing the import.