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feat(fsrepo): protect with a repo lockfile

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NB: daemon is one spot the repo lock is typically acquired
This commit is contained in:
Brian Tiger Chow
2015-01-13 17:19:31 -08:00
parent 67c161fb72
commit 40e41d24f7
5 changed files with 60 additions and 16 deletions
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10
cmd/ipfs/daemon.go
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@ -12,7 +12,7 @@ import (
cmdsHttp "github.com/jbenet/go-ipfs/commands/http"
core "github.com/jbenet/go-ipfs/core"
commands "github.com/jbenet/go-ipfs/core/commands"
daemon "github.com/jbenet/go-ipfs/core/daemon"
fsrepo "github.com/jbenet/go-ipfs/repo/fsrepo"
util "github.com/jbenet/go-ipfs/util"
"github.com/jbenet/go-ipfs/util/debugerror"
)
@ -89,13 +89,13 @@ func daemonFunc(req cmds.Request) (interface{}, error) {
return nil, err
}
// acquire the daemon lock _before_ constructing a node. we need to make
// acquire the repo lock _before_ constructing a node. we need to make
// sure we are permitted to access the resources (datastore, etc.)
lock, err := daemon.Lock(req.Context().ConfigRoot)
if err != nil {
repo := fsrepo.At(req.Context().ConfigRoot)
if err := repo.Open(); err != nil {
return nil, debugerror.Errorf("Couldn't obtain lock. Is another daemon already running?")
}
defer lock.Close()
defer repo.Close()
// OK!!! Now we're ready to construct the node.
// make sure we construct an online node.