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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 | } |
| 38 |