Use the standard library's "errors" package to create errors so that
backtraces in wrapped errors terminate at the point where the error was
first wrapped, and not at the line where we created the error, which
isn't as useful for troubleshooting.
Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>
We need to be able to acquire locks on storage areas which aren't
mounted read-write, which return errors when we attempt to open a file
in the mode where we can take write locks on them. This patch adds a
read-only lock type for use in those cases.
A given file can be opened for read-locking or write-locking, but not
both. Our Locker interface gains an IsReadWrite() method to let callers
tell the difference.
Based on patches by Dan Walsh <dwalsh@redhat.com>
Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>
Nalin Dahyabhai