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// Copyright (c) 2020, Control Command Inc. All rights reserved.
// Copyright (c) 2019-2021, Sylabs Inc. All rights reserved.
// This software is licensed under a 3-clause BSD license. Please consult the
// LICENSE.md file distributed with the sources of this project regarding your
// rights to use or distribute this software.
package singularity
import (
"fmt"
"io"
"os"
"github.com/sylabs/singularity/v4/internal/pkg/remote"
)
func syncSysConfig(cUsr *remote.Config) error {
// opening system config file
f, err := os.OpenFile(remote.SystemConfigPath, os.O_RDONLY, 0o600)
if err != nil && os.IsNotExist(err) {
return nil
} else if err != nil {
return fmt.Errorf("while opening remote config file: %s", err)
}
defer f.Close()
// read file contents to config struct
cSys, err := remote.ReadFrom(f)
if err != nil {
return fmt.Errorf("while parsing remote config data: %s", err)
}
// sync cUsr with system config cSys
return cUsr.SyncFrom(cSys)
}
// RemoteUse sets remote to use
func RemoteUse(usrConfigFile, name string, global, exclusive bool) (err error) {
if exclusive {
if os.Getuid() != 0 {
return fmt.Errorf("unable to set endpoint as exclusive: not root user")
}
global = true
usrConfigFile = remote.SystemConfigPath
}
// system config should be world readable
perm := os.FileMode(0o600)
if global {
perm = os.FileMode(0o644)
}
// opening config file
file, err := os.OpenFile(usrConfigFile, os.O_RDWR|os.O_CREATE, perm)
if err != nil {
return fmt.Errorf("while opening remote config file: %s", err)
}
defer file.Close()
// read file contents to config struct
c, err := remote.ReadFrom(file)
if err != nil {
return fmt.Errorf("while parsing remote config data: %s", err)
}
if !global {
if err := syncSysConfig(c); err != nil {
return err
}
}
if err := c.SetDefault(name, exclusive); err != nil {
return err
}
// truncating file before writing new contents and syncing to commit file
if err := file.Truncate(0); err != nil {
return fmt.Errorf("while truncating remote config file: %s", err)
}
if n, err := file.Seek(0, io.SeekStart); err != nil || n != 0 {
return fmt.Errorf("failed to reset %s cursor: %s", file.Name(), err)
}
if _, err := c.WriteTo(file); err != nil {
return fmt.Errorf("while writing remote config to file: %s", err)
}
if err := file.Sync(); err != nil {
return fmt.Errorf("failed to flush remote config file %s: %s", file.Name(), err)
}
return nil
}
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