mirror of
https://github.com/opencontainers/runc.git
synced 2026-07-11 22:37:14 +08:00
Kir Kolyshkin
dbb9fc03ae
Only some libcontainer packages can be built on non-linux platforms
(not that it make sense, but at least go build succeeds). Let's call
these "good" packages.
For all other packages (i.e. ones that fail to build with GOOS other
than linux), it does not make sense to have linux build tag (as they
are broken already, and thus are not and can not be used on anything
other than Linux).
Remove linux build tag for all non-"good" packages.
This was mostly done by the following script, with just a few manual
fixes on top.
function list_good_pkgs() {
for pkg in $(find . -type d -print); do
GOOS=freebsd go build $pkg 2>/dev/null \
&& GOOS=solaris go build $pkg 2>/dev/null \
&& echo $pkg
done | sed -e 's|^./||' | tr '\n' '|' | sed -e 's/|$//'
}
function remove_tag() {
sed -i -e '\|^// +build linux$|d' $1
go fmt $1
}
SKIP="^("$(list_good_pkgs)")"
for f in $(git ls-files . | grep .go$); do
if echo $f | grep -qE "$SKIP"; then
echo skip $f
continue
fi
echo proc $f
remove_tag $f
done
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
97 lines
2.3 KiB
Go
97 lines
2.3 KiB
Go
package systemd
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import (
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"context"
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"sync"
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systemdDbus "github.com/coreos/go-systemd/v22/dbus"
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dbus "github.com/godbus/dbus/v5"
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)
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var (
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dbusC *systemdDbus.Conn
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dbusMu sync.RWMutex
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dbusInited bool
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dbusRootless bool
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)
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type dbusConnManager struct{}
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// newDbusConnManager initializes systemd dbus connection manager.
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func newDbusConnManager(rootless bool) *dbusConnManager {
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dbusMu.Lock()
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defer dbusMu.Unlock()
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if dbusInited && rootless != dbusRootless {
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panic("can't have both root and rootless dbus")
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}
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dbusInited = true
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dbusRootless = rootless
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return &dbusConnManager{}
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}
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// getConnection lazily initializes and returns systemd dbus connection.
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func (d *dbusConnManager) getConnection() (*systemdDbus.Conn, error) {
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// In the case where dbusC != nil
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// Use the read lock the first time to ensure
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// that Conn can be acquired at the same time.
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dbusMu.RLock()
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if conn := dbusC; conn != nil {
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dbusMu.RUnlock()
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return conn, nil
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}
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dbusMu.RUnlock()
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// In the case where dbusC == nil
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// Use write lock to ensure that only one
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// will be created
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dbusMu.Lock()
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defer dbusMu.Unlock()
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if conn := dbusC; conn != nil {
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return conn, nil
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}
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conn, err := d.newConnection()
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if err != nil {
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return nil, err
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}
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dbusC = conn
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return conn, nil
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}
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func (d *dbusConnManager) newConnection() (*systemdDbus.Conn, error) {
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if dbusRootless {
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return newUserSystemdDbus()
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}
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return systemdDbus.NewWithContext(context.TODO())
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}
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// resetConnection resets the connection to its initial state
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// (so it can be reconnected if necessary).
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func (d *dbusConnManager) resetConnection(conn *systemdDbus.Conn) {
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dbusMu.Lock()
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defer dbusMu.Unlock()
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if dbusC != nil && dbusC == conn {
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dbusC.Close()
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dbusC = nil
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}
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}
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var errDbusConnClosed = dbus.ErrClosed.Error()
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// retryOnDisconnect calls op, and if the error it returns is about closed dbus
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// connection, the connection is re-established and the op is retried. This helps
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// with the situation when dbus is restarted and we have a stale connection.
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func (d *dbusConnManager) retryOnDisconnect(op func(*systemdDbus.Conn) error) error {
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for {
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conn, err := d.getConnection()
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if err != nil {
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return err
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}
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err = op(conn)
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if !isDbusError(err, errDbusConnClosed) {
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return err
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}
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d.resetConnection(conn)
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}
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}
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