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When multiple containers run inside a sentry, each container has its own root
filesystem and set of mounts. Containers are also added after sentry boot rather
than all configured and known at boot time.
The fsgofer needs to be able to serve the root filesystem of each container.
Thus, it must be possible to add filesystems after the fsgofer has already
started.
This change:
* Creates a URPC endpoint within the gofer process that listens for requests to
serve new content.
* Enables the sentry, when starting a new container, to add the new container's
filesystem.
* Mounts those new filesystems at separate roots within the sentry.
PiperOrigin-RevId: 208903248
Change-Id: Ifa91ec9c8caf5f2f0a9eead83c4a57090ce92068
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PiperOrigin-RevId: 206674267
Change-Id: Ifc4eb19e0882e8bed566e9c553af910925fe6ae2
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Refuse to mount paths with "." and ".." in the path to prevent
a compromised Sentry to mount "../../secrets". Only allow
Attach to be called once per mount point.
PiperOrigin-RevId: 199225929
Change-Id: I2a3eb7ea0b23f22eb8dde2e383e32563ec003bd5
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os.Rename validates that the target doesn't exist, which is different from
syscall.Rename which replace the target if both are directories. fsgofer needs
the syscall behavior.
PiperOrigin-RevId: 196194630
Change-Id: I87d08cad88b5ef310b245cd91647c4f5194159d8
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This is to allow files mapped directly, like /etc/hosts, to be writable.
Closes #40
PiperOrigin-RevId: 196155920
Change-Id: Id2027e421cef5f94a0951c3e18b398a77c285bbd
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PiperOrigin-RevId: 195469901
Change-Id: I66d5c7a334bbb8b47e40d266a2661291c2d91c7f
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PiperOrigin-RevId: 194583126
Change-Id: Ica1d8821a90f74e7e745962d71801c598c652463
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