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| 1 | // Package controlsock names the root instance-control channel (design |
| 2 | // §5). It is a leaf package with no internal imports so both |
| 3 | // internal/provision and internal/unixdial can depend on it without an |
| 4 | // import cycle: provision already imports internal/release (for the |
| 5 | // store), and internal/release's unix dial sites need |
| 6 | // unixdial.Checked — which must know the control endpoint's path |
| 7 | // without pulling provision (and therefore release) back in. |
| 8 | package controlsock |
| 9 | |
| 10 | import ( |
| 11 | "path/filepath" |
| 12 | "strings" |
| 13 | ) |
| 14 | |
| 15 | // Dir and Path are the root instance-control channel (design §5). |
| 16 | // Deliberately NOT under provision.SocketDir: an instance's namespace |
| 17 | // replaces /run/carlos with an empty tmpfs, and nothing an instance can |
| 18 | // reach must resolve to this path. |
| 19 | const ( |
| 20 | Dir = "/run/carlos-control" |
| 21 | Path = Dir + "/control.sock" |
| 22 | ) |
| 23 | |
| 24 | // IsEndpoint reports whether path is the control channel or anything |
| 25 | // else under its directory. The edge and the agent refuse to dial such a |
| 26 | // path as an upstream (design §5.4): a registry row pointing at it is |
| 27 | // refused before connect(). |
| 28 | func IsEndpoint(path string) bool { |
| 29 | clean := filepath.Clean(path) |
| 30 | return clean == Dir || strings.HasPrefix(clean, Dir+"/") |
| 31 | } |
| 32 | |
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