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This allows to make a 17% smaller runc binary by not compiling in checkpoint/restore support. It turns out that google.golang.org/protobuf package, used by go-criu, is quite big, and go linker can't drop unused stuff if reflection is used anywhere in the code. Currently there's no alternative to using protobuf in go-criu, and since not all users use c/r, let's provide them an option for a smaller binary. For the reference, here's top10 biggest vendored packages, as reported by gsa[1]: $ gsa runc | grep vendor | head │ 8.59% │ google.golang.org/protobuf │ 1.3 MB │ vendor │ │ 5.76% │ github.com/opencontainers/runc │ 865 kB │ vendor │ │ 4.05% │ github.com/cilium/ebpf │ 608 kB │ vendor │ │ 2.86% │ github.com/godbus/dbus/v5 │ 429 kB │ vendor │ │ 1.25% │ github.com/urfave/cli │ 188 kB │ vendor │ │ 0.90% │ github.com/vishvananda/netlink │ 135 kB │ vendor │ │ 0.59% │ github.com/sirupsen/logrus │ 89 kB │ vendor │ │ 0.56% │ github.com/checkpoint-restore/go-criu/v6 │ 84 kB │ vendor │ │ 0.51% │ golang.org/x/sys │ 76 kB │ vendor │ │ 0.47% │ github.com/seccomp/libseccomp-golang │ 71 kB │ vendor │ And here is a total binary size saving when `runc_nocriu` is used. For non-stripped binaries: $ gsa runc-cr runc-nocr | tail -3 │ -17.04% │ runc-cr │ 15 MB │ 12 MB │ -2.6 MB │ │ │ runc-nocr │ │ │ │ └─────────┴──────────────────────────────────────────┴──────────┴──────────┴─────────┘ And for stripped binaries: │ -17.01% │ runc-cr-stripped │ 11 MB │ 8.8 MB │ -1.8 MB │ │ │ runc-nocr-stripped │ │ │ │ └─────────┴──────────────────────────────────────────┴──────────┴──────────┴─────────┘ [1]: https://github.com/Zxilly/go-size-analyzer Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
16 lines
355 B
Go
16 lines
355 B
Go
//go:build runc_nocriu
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package libcontainer
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import "errors"
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var ErrNoCR = errors.New("this runc binary has not been compiled with checkpoint/restore support enabled (runc_nocriu)")
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func (c *Container) Restore(process *Process, criuOpts *CriuOpts) error {
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return ErrNoCR
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}
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func (c *Container) Checkpoint(criuOpts *CriuOpts) error {
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return ErrNoCR
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}
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