Stop folder when running out of disk space (fixes #2057)

& tweaks by calmh

Godeps/_workspace/src/github.com/calmh/du/LICENSE

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org>

Godeps/_workspace/src/github.com/calmh/du/README.md

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+du
+==
+
+Get total and available disk space on a given volume.
+
+Documentation
+-------------
+
+http://godoc.org/github.com/calmh/du
+
+License
+-------
+
+Public Domain

Godeps/_workspace/src/github.com/calmh/du/cmd/du/main.go

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+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/calmh/du"
+)
+
+var KB = int64(1024)
+
+func main() {
+	usage, err := du.Get(os.Args[1])
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println("Free:", usage.FreeBytes/(KB*KB), "MiB")
+	fmt.Println("Available:", usage.AvailBytes/(KB*KB), "MiB")
+	fmt.Println("Size:", usage.TotalBytes/(KB*KB), "MiB")
+}

Godeps/_workspace/src/github.com/calmh/du/diskusage.go

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+package du
+
+// Usage holds information about total and available storage on a volume.
+type Usage struct {
+	TotalBytes int64 // Size of volume
+	FreeBytes  int64 // Unused size
+	AvailBytes int64 // Available to a non-privileged user
+}

Godeps/_workspace/src/github.com/calmh/du/diskusage_posix.go

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+// +build !windows,!netbsd,!openbsd,!solaris
+
+package du
+
+import (
+	"path/filepath"
+	"syscall"
+)
+
+// Get returns the Usage of a given path, or an error if usage data is
+// unavailable.
+func Get(path string) (Usage, error) {
+	var stat syscall.Statfs_t
+	err := syscall.Statfs(filepath.Clean(path), &stat)
+	if err != nil {
+		return Usage{}, err
+	}
+	u := Usage{
+		FreeBytes:  int64(stat.Bfree) * int64(stat.Bsize),
+		TotalBytes: int64(stat.Blocks) * int64(stat.Bsize),
+		AvailBytes: int64(stat.Bavail) * int64(stat.Bsize),
+	}
+	return u, nil
+}

Godeps/_workspace/src/github.com/calmh/du/diskusage_unsupported.go

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+// +build netbsd openbsd solaris
+
+package du
+
+import "errors"
+
+var ErrUnsupported = errors.New("unsupported platform")
+
+// Get returns the Usage of a given path, or an error if usage data is
+// unavailable.
+func Get(path string) (Usage, error) {
+	return Usage{}, ErrUnsupported
+}

Godeps/_workspace/src/github.com/calmh/du/diskusage_windows.go

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+package du
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// Get returns the Usage of a given path, or an error if usage data is
+// unavailable.
+func Get(path string) (Usage, error) {
+	h := syscall.MustLoadDLL("kernel32.dll")
+	c := h.MustFindProc("GetDiskFreeSpaceExW")
+
+	var u Usage
+
+	ret, _, err := c.Call(
+		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(path))),
+		uintptr(unsafe.Pointer(&u.FreeBytes)),
+		uintptr(unsafe.Pointer(&u.TotalBytes)),
+		uintptr(unsafe.Pointer(&u.AvailBytes)))
+
+	if ret == 0 {
+		return u, err
+	}
+
+	return u, nil
+}