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836fa4c493
Commit(fe3faa517e1b) introduced a lock file for network create/rm calls. There is a problem with the location of the lock file. The lock file was stored in the tmpdir. Running multiple podman network create/remove commands in parallel with different tmpdirs made the lockfile inaccessible to the other process, and so parallel read/write operations to the cni config directory continued to occur. This scenario happened frequently during the e2e tests and caused some flakes. Fixes #9041 Signed-off-by: Paul Holzinger <paul.holzinger@web.de>
36 lines
835 B
Go
36 lines
835 B
Go
package network
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import (
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"os"
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"path/filepath"
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"github.com/containers/common/pkg/config"
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"github.com/containers/storage"
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)
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// acquireCNILock gets a lock that should be used in create and
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// delete cases to avoid unwanted collisions in network names.
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// TODO this uses a file lock and should be converted to shared memory
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// when we have a more general shared memory lock in libpod
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func acquireCNILock(config *config.Config) (*CNILock, error) {
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cniDir := GetCNIConfDir(config)
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err := os.MkdirAll(cniDir, 0755)
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if err != nil {
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return nil, err
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}
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l, err := storage.GetLockfile(filepath.Join(cniDir, LockFileName))
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if err != nil {
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return nil, err
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}
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l.Lock()
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cnilock := CNILock{
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Locker: l,
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}
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return &cnilock, nil
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}
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// ReleaseCNILock unlocks the previously held lock
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func (l *CNILock) releaseCNILock() {
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l.Unlock()
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}
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