libcontainer: Use gocapability's NewPid2 #1735
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…90bc0 With: $ go get -u github.com/syndtr/gocapability/capability $ sed -i 's/db04d3cc01c8b54962a58ec7e491717d06cfcc16/33e07d32887e1e06b7c025f27ce52f62c7990bc0/' vendor.conf $ vndr $ git add git add vendor.conf vendor/github.com/syndtr Signed-off-by: W. Trevor King <[email protected]>
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For newContainerCapList, we don't care what the current values are.
Using NewPid2 saves us a few syscalls at no cost.
For bootstrapData, this avoids crashing when there is no
container-side /proc. Previously you'd get:
container_linux.go:... starting container process caused "open
/proc/self/status: no such file or directory"
The IsNotExist check is because we do need to load the effective set.
But capsV3's Load() does that first with the capget() call. After the
capget call it hits /proc for bounding and ambient capabilities. We
don't need those, so the not-exist error isn't a problem. This is a
fairly tight binding to the current gocapability implementation, but
we vendor gocapability, so I'm not too worried about it. If it
becomes an issue we can follow up with a LoadType(which CapType) so we
can explicitly ask to only load the effective set.
Signed-off-by: W. Trevor King <[email protected]>
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For
newContainerCapList, we don't care what the current values are. UsingNewPid2saves us a few syscalls at no cost.For
bootstrapData, this avoids crashing when there is no container-side/proc. Previously you'd get:The
IsNotExistcheck is because we do need to load the effective set. ButcapsV3'sLoad()does that first with thecapget()call. After thecapgetcall it hits/procfor bounding and ambient capabilities. We don't need those, so a not-exist error isn't a problem. This is a fairly tight binding to the current gocapability implementation, but we vendor gocapability, so I'm not too worried about it. If it becomes an issue we can follow up with aLoadType(which CapType)so we can explicitly ask to only load the effective set.Part of #1734.