qga: determine default state dir and pidfile dynamically
No effective change on POSIX, but on Win32 the defaults come from the environment / session. Since commit 39097daf ("qemu-ga: use key-value store to avoid recycling fd handles after restart") we've relied on the state directory for the fd handles' key-value store. Even though we don't support the guest-file-* commands on win32 yet, the key-value store is written, and it's the first use of the state directory on win32. We should have a sensible default for its location. Signed-off-by: NLaszlo Ersek <lersek@redhat.com> Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>
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