986f076276
Add a new generic container registry client via a new `container` package. Use this to create a command line utility as well as a new upload target for container registries. The code uses the github.com/containers/* project and packages to interact with container registires that is also used by skopeo, podman et al. One if the dependencies is `proglottis/gpgme` that is using cgo to bind libgpgme, so we have to add the corresponding devel package to the BuildRequires as well as installing it on CI. Checks will follow later via an integration test.
90 lines
1.9 KiB
Go
90 lines
1.9 KiB
Go
// +build aix
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package bbolt
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import (
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"fmt"
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"syscall"
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"time"
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"unsafe"
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"golang.org/x/sys/unix"
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)
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// flock acquires an advisory lock on a file descriptor.
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func flock(db *DB, exclusive bool, timeout time.Duration) error {
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var t time.Time
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if timeout != 0 {
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t = time.Now()
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}
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fd := db.file.Fd()
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var lockType int16
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if exclusive {
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lockType = syscall.F_WRLCK
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} else {
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lockType = syscall.F_RDLCK
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}
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for {
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// Attempt to obtain an exclusive lock.
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lock := syscall.Flock_t{Type: lockType}
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err := syscall.FcntlFlock(fd, syscall.F_SETLK, &lock)
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if err == nil {
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return nil
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} else if err != syscall.EAGAIN {
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return err
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}
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// If we timed out then return an error.
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if timeout != 0 && time.Since(t) > timeout-flockRetryTimeout {
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return ErrTimeout
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}
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// Wait for a bit and try again.
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time.Sleep(flockRetryTimeout)
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}
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}
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// funlock releases an advisory lock on a file descriptor.
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func funlock(db *DB) error {
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var lock syscall.Flock_t
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lock.Start = 0
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lock.Len = 0
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lock.Type = syscall.F_UNLCK
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lock.Whence = 0
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return syscall.FcntlFlock(uintptr(db.file.Fd()), syscall.F_SETLK, &lock)
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}
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// mmap memory maps a DB's data file.
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func mmap(db *DB, sz int) error {
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// Map the data file to memory.
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b, err := unix.Mmap(int(db.file.Fd()), 0, sz, syscall.PROT_READ, syscall.MAP_SHARED|db.MmapFlags)
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if err != nil {
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return err
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}
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// Advise the kernel that the mmap is accessed randomly.
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if err := unix.Madvise(b, syscall.MADV_RANDOM); err != nil {
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return fmt.Errorf("madvise: %s", err)
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}
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// Save the original byte slice and convert to a byte array pointer.
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db.dataref = b
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db.data = (*[maxMapSize]byte)(unsafe.Pointer(&b[0]))
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db.datasz = sz
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return nil
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}
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// munmap unmaps a DB's data file from memory.
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func munmap(db *DB) error {
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// Ignore the unmap if we have no mapped data.
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if db.dataref == nil {
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return nil
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}
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// Unmap using the original byte slice.
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err := unix.Munmap(db.dataref)
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db.dataref = nil
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db.data = nil
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db.datasz = 0
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return err
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}
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