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3c0c5ed4e0
godep restore pushd $GOPATH/src/github.com/appc/spec git co master popd go get go4.org/errorutil rm -rf Godeps godep save ./... git add vendor git add -f $(git ls-files --other vendor/) git co -- Godeps/LICENSES Godeps/.license_file_state Godeps/OWNERS
57 lines
1.3 KiB
Go
57 lines
1.3 KiB
Go
package utils
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import (
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"crypto/rand"
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"encoding/hex"
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"encoding/json"
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"io"
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"path/filepath"
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"syscall"
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)
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const (
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exitSignalOffset = 128
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)
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// GenerateRandomName returns a new name joined with a prefix. This size
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// specified is used to truncate the randomly generated value
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func GenerateRandomName(prefix string, size int) (string, error) {
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id := make([]byte, 32)
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if _, err := io.ReadFull(rand.Reader, id); err != nil {
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return "", err
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}
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if size > 64 {
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size = 64
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}
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return prefix + hex.EncodeToString(id)[:size], nil
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}
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// ResolveRootfs ensures that the current working directory is
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// not a symlink and returns the absolute path to the rootfs
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func ResolveRootfs(uncleanRootfs string) (string, error) {
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rootfs, err := filepath.Abs(uncleanRootfs)
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if err != nil {
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return "", err
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}
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return filepath.EvalSymlinks(rootfs)
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}
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// ExitStatus returns the correct exit status for a process based on if it
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// was signaled or exited cleanly
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func ExitStatus(status syscall.WaitStatus) int {
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if status.Signaled() {
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return exitSignalOffset + int(status.Signal())
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}
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return status.ExitStatus()
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}
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// WriteJSON writes the provided struct v to w using standard json marshaling
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func WriteJSON(w io.Writer, v interface{}) error {
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data, err := json.Marshal(v)
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if err != nil {
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return err
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}
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_, err = w.Write(data)
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return err
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}
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