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bb934c6aca
Functions `GetMounts()` and `parseMountTable()` return all the entries as read and parsed from /proc/self/mountinfo. In many cases the caller is only interested only one or a few entries, not all of them. One good example is `Mounted()` function, which looks for a specific entry only. Another example is `RecursiveUnmount()` which is only interested in mount under a specific path. This commit adds `filter` argument to `GetMounts()` to implement two things: 1. filter out entries a caller is not interested in 2. stop processing if a caller is found what it wanted `nil` can be passed to get a backward-compatible behavior, i.e. return all the entries. A few filters are implemented: - `PrefixFilter`: filters out all entries not under `prefix` - `SingleEntryFilter`: looks for a specific entry Finally, `Mounted()` is modified to use `SingleEntryFilter()`, and `RecursiveUnmount()` is using `PrefixFilter()`. Unit tests are added to check filters are working. [v2: ditch NoFilter, use nil] [v3: ditch GetMountsFiltered()] [v4: add unit test for filters] [v5: switch to gotestyourself] Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
55 lines
1.1 KiB
Go
55 lines
1.1 KiB
Go
package mount // import "github.com/docker/docker/pkg/mount"
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/*
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#include <sys/param.h>
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#include <sys/ucred.h>
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#include <sys/mount.h>
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*/
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import "C"
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import (
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"fmt"
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"reflect"
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"unsafe"
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)
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// Parse /proc/self/mountinfo because comparing Dev and ino does not work from
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// bind mounts.
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func parseMountTable(filter FilterFunc) ([]*Info, error) {
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var rawEntries *C.struct_statfs
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count := int(C.getmntinfo(&rawEntries, C.MNT_WAIT))
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if count == 0 {
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return nil, fmt.Errorf("Failed to call getmntinfo")
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}
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var entries []C.struct_statfs
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header := (*reflect.SliceHeader)(unsafe.Pointer(&entries))
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header.Cap = count
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header.Len = count
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header.Data = uintptr(unsafe.Pointer(rawEntries))
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var out []*Info
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for _, entry := range entries {
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var mountinfo Info
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var skip, stop bool
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mountinfo.Mountpoint = C.GoString(&entry.f_mntonname[0])
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if filter != nil {
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// filter out entries we're not interested in
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skip, stop = filter(p)
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if skip {
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continue
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}
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}
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mountinfo.Source = C.GoString(&entry.f_mntfromname[0])
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mountinfo.Fstype = C.GoString(&entry.f_fstypename[0])
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out = append(out, &mountinfo)
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if stop {
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break
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}
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}
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return out, nil
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}
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