This doesn't really change behavior, just what it looks like in the UX.
However, it does make tests more complicated. Most were fixed by adding
a sorting function, which is generally useful anyways.
Adds HUP support for audit log files to close and reopen. This makes it
much easier to deal with normal log rotation methods.
As part of testing this I noticed that HUP and other items that come out
of command/server.go are going to stderr, which is where our normal log
lines go. This isn't so much problematic with our normal output but as
we officially move to supporting other formats this can cause
interleaving issues, so I moved those to stdout instead.
The rollback manager was using a saved MountTable rather than the
current table, causing it to attempt to rollback unmounted mounts, and
never rollback new mounts.
In fixing this, it became clear that bad things could happen to the
mount table...the table itself could be locked, but the table pointer
(which is what the rollback manager needs) could be modified at any time
without locking. This commit therefore also returns locking to a mutex
outside the table instead of inside, and plumbs RLock/RUnlock through to
the various places that are reading the table but not holding a write
lock.
Both unit tests and race detection pass.
Fixes#771
In order to implement this efficiently, I have introduced the concept of
"singleton" backends -- currently, 'sys' and 'cubbyhole'. There isn't
much reason to allow sys to be mounted at multiple places, and there
isn't much reason you'd need multiple per-token storage areas. By
restricting it to just one, I can store that particular mount instead of
iterating through them in order to call the appropriate revoke function.
Additionally, because revocation on the backend needs to be triggered by
the token store, the token store's salt is kept in the router and
client tokens going to the cubbyhole backend are double-salted by the
router. This allows the token store to drive when revocation happens
using its salted tokens.
Jeff Mitchell