While it is important to not create controllers for an invalid task,
certain properties should only be checked immediately before use. Early
host validation of mounts prevents resolution of the task Executor when
the mounts are not relevant to execution flow. In this case, we have a
check for the existence of a bind mount path in a creation function that
prevents a task controller from being resolved. Such early validation
prevents one from interacting directly with a controller and result in
unnecessary error reporting.
In accordance with the above, we move the validation of the existence of
host bind mount paths to the `Controller.Start` phase. We also call
these "checks", as they are valid mounts but reference non-existent
paths.
Signed-off-by: Stephen J Day <stephen.day@docker.com>
This is intended as a minor fix for 1.12.1 so that task creation doesn't
do unexpected things when the user supplies erroneous paths.
In particular, because we're currently using hostConfig.Binds to setup
mounts, if a user uses an absolute path for a volume mount source, or a
non-absolute path for a bind mount source, the engine will do the
opposite of what the user requested since all absolute paths are
treated as binds and all non-absolute paths are treated as named
volumes.
Fixes#25253
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
