Re: [libvirt] [PATCH v2] remote: Print ssh stderr on connection failure

Signed-off-by: Cole Robinson <crobinso(a)redhat.com&gt; --- src/remote/remote_driver.c | 38 +++++++++++++++++++++++++++++++++++--- 1 files changed, 35 insertions(+), 3 deletions(-) diff --git a/src/remote/remote_driver.c b/src/remote/remote_driver.c index 13534ce..8914c39 100644 --- a/src/remote/remote_driver.c +++ b/src/remote/remote_driver.c @@ -154,6 +154,7 @@ struct private_data { virMutex lock; int sock; /* Socket. */ + int errfd; /* File handle connected to remote stderr */ int watch; /* File handle watch */ pid_t pid; /* PID of tunnel process */ int uses_tls; /* TLS enabled on socket? */ @@ -783,6 +784,7 @@ doRemoteOpen (virConnectPtr conn, case trans_ext: { pid_t pid; int sv[2]; + int errfd[2]; /* Fork off the external process. Use socketpair to create a private * (unnamed) Unix domain socket to the child process so we don't have @@ -794,14 +796,22 @@ doRemoteOpen (virConnectPtr conn, goto failed; } + if (pipe(errfd) == -1) { + virReportSystemError(errno, "%s", + _("unable to create socket pair")); + goto failed; + } + if (virExec((const char**)cmd_argv, NULL, NULL, - &pid, sv[1], &(sv[1]), NULL, + &pid, sv[1], &(sv[1]), &(errfd[1]), VIR_EXEC_CLEAR_CAPS) < 0) goto failed; /* Parent continues here. */ close (sv[1]); + close (errfd[1]); priv->sock = sv[0]; + priv->errfd = errfd[0]; priv->pid = pid; /* Do not set 'is_secure' flag since we can't guarentee @@ -827,6 +837,12 @@ doRemoteOpen (virConnectPtr conn, goto failed; } + if ((priv->errfd != -1) && virSetNonBlock(priv->errfd) < 0) { + virReportSystemError(errno, "%s", + _("unable to make socket non-blocking")); + goto failed; + } + if (pipe(wakeupFD) < 0) { virReportSystemError(errno, "%s", _("unable to make pipe")); @@ -939,6 +955,9 @@ doRemoteOpen (virConnectPtr conn, failed: /* Close the socket if we failed. */ + if (priv->errfd >= 0) + close(priv->errfd); + if (priv->sock >= 0) { if (priv->uses_tls && priv->session) { gnutls_bye (priv->session, GNUTLS_SHUT_RDWR); @@ -986,6 +1005,7 @@ remoteAllocPrivateData(virConnectPtr conn) priv->localUses = 1; priv->watch = -1; priv->sock = -1; + priv->errfd = -1; return priv; } @@ -1408,6 +1428,7 @@ doRemoteClose (virConnectPtr conn, struct private_data *priv) sasl_dispose (&priv->saslconn); #endif close (priv->sock); + close (priv->errfd); #ifndef WIN32 if (priv->pid > 0) { @@ -7785,12 +7806,23 @@ remoteIOReadBuffer(virConnectPtr conn, if (errno == EWOULDBLOCK) return 0; + char errout[1024] = "\0"; + if (priv->errfd != -1) { + saferead(priv->errfd, errout, sizeof(errout)); + } + virReportSystemError(errno, - "%s", _("cannot recv data")); + _("cannot recv data: %s"), errout); + } else { + char errout[1024] = "\0"; + if (priv->errfd != -1) { + saferead(priv->errfd, errout, sizeof(errout)); + } + errorf (in_open ? NULL : conn, VIR_ERR_SYSTEM_ERROR, - "%s", _("server closed connection")); + _("server closed connection: %s"), errout); } return -1; }