vole
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4e3759da
Keenan Nemetz
1h ago
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1 | package agent |
| 2 | ||
| 3 | // The runner's disk, as the only bound a job tree has. | |
| 4 | // | |
| 5 | // A job's workspace is a bind mount from the host: the runtime cannot quota it, and a | |
| 6 | // filesystem quota there would need root and a filesystem that supports one. What the | |
| 7 | // runner can promise is that it notices, so a job that writes without a bound costs | |
| 8 | // that job instead of the machine. The reserve is one statfs on the filesystem holding | |
| 9 | // --dir, checked while a command runs, and reported with the numbers. | |
| 10 | ||
| 11 | import ( | |
| 12 | "syscall" | |
| 13 | ) | |
| 14 | ||
| 15 | // freeBytes reports how many bytes are available to this user on the filesystem | |
| 16 | // holding dir. | |
| 17 | func freeBytes(dir string) (int64, error) { | |
| 18 | var st syscall.Statfs_t | |
| 19 | if err := syscall.Statfs(dir, &st); err != nil { | |
| 20 | return 0, err | |
| 21 | } | |
| 22 | return int64(st.Bavail) * int64(st.Bsize), nil | |
| 23 | } | |
| 24 | ||
| 25 | // diskLow reports whether the filesystem holding dir has less than reserve bytes | |
| 26 | // free. A reserve of zero disables the check, which is what a runner whose --dir is | |
| 27 | // on its own sized filesystem may choose. | |
| 28 | func diskLow(dir string, reserve int64) (free int64, low bool, err error) { | |
| 29 | if reserve <= 0 || dir == "" { | |
| 30 | return 0, false, nil | |
| 31 | } | |
| 32 | free, err = freeBytes(dir) | |
| 33 | if err != nil { | |
| 34 | return 0, false, err | |
| 35 | } | |
| 36 | return free, free < reserve, nil | |
| 37 | } |