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| 1 | //go:build linux |
| 2 | |
| 3 | package host |
| 4 | |
| 5 | import ( |
| 6 | "errors" |
| 7 | "os" |
| 8 | |
| 9 | "github.com/carlosframework/platform/internal/hostwrite" |
| 10 | "github.com/carlosframework/platform/internal/safefile" |
| 11 | "golang.org/x/sys/unix" |
| 12 | ) |
| 13 | |
| 14 | func prepareClaimDatabaseOwner(path string, uid, gid int) error { |
| 15 | for _, suffix := range []string{"", "-wal", "-shm"} { |
| 16 | name := path + suffix |
| 17 | f, err := safefile.OpenFile(name, os.O_RDWR, 0) |
| 18 | created := false |
| 19 | if errors.Is(err, unix.ENOENT) { |
| 20 | if suffix != "" { |
| 21 | continue |
| 22 | } |
| 23 | f, err = safefile.OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0600) |
| 24 | created = err == nil |
| 25 | } |
| 26 | if err != nil { |
| 27 | return err |
| 28 | } |
| 29 | err = func() error { |
| 30 | defer f.Close() |
| 31 | fd := int(f.Fd()) |
| 32 | var stat unix.Stat_t |
| 33 | if err := unix.Fstat(fd, &stat); err != nil { |
| 34 | return err |
| 35 | } |
| 36 | if stat.Mode&unix.S_IFMT != unix.S_IFREG || stat.Nlink != 1 || (!created && int(stat.Uid) != uid) { |
| 37 | return hostwrite.ErrUnavailable |
| 38 | } |
| 39 | if created && os.Geteuid() == 0 { |
| 40 | if err := unix.Fchown(fd, uid, gid); err != nil { |
| 41 | return err |
| 42 | } |
| 43 | } |
| 44 | return unix.Fchmod(fd, 0600) |
| 45 | }() |
| 46 | if err != nil { |
| 47 | return err |
| 48 | } |
| 49 | } |
| 50 | return nil |
| 51 | } |
| 52 | |
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