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authorLennart Poettering <lennart@poettering.net>2015-01-19 20:21:57 +0100
committerLennart Poettering <lennart@poettering.net>2015-01-19 20:24:10 +0100
commit2fbe4296c5ba5bcce3ac845f196c60a88e3181fe (patch)
treeeed01094fccb68bae04536f654852a1c5123f363 /src/nspawn
parent0716faad4a846d5f3cdce4bf37648d3254b9332f (diff)
inspawn: wait until udev has probed a loopback device before making us of it
Diffstat (limited to 'src/nspawn')
-rw-r--r--src/nspawn/nspawn.c65
1 files changed, 62 insertions, 3 deletions
diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c
index e2ce9fbc55..e71d9a88ad 100644
--- a/src/nspawn/nspawn.c
+++ b/src/nspawn/nspawn.c
@@ -43,6 +43,8 @@
#include <linux/veth.h>
#include <sys/personality.h>
#include <linux/loop.h>
+#include <poll.h>
+#include <sys/file.h>
#ifdef HAVE_SELINUX
#include <selinux/selinux.h>
@@ -2557,6 +2559,63 @@ static int setup_image(char **device_path, int *loop_nr) {
return r;
}
+static int wait_for_block_device(struct udev *udev, dev_t devnum, struct udev_device **ret) {
+ _cleanup_udev_monitor_unref_ struct udev_monitor *monitor = NULL;
+ int r;
+
+ assert(udev);
+ assert(ret);
+
+ for (;;) {
+ _cleanup_udev_device_unref_ struct udev_device *d = NULL;
+ struct pollfd pfd = {
+ .events = POLLIN
+ };
+
+ d = udev_device_new_from_devnum(udev, 'b', devnum);
+ if (!d)
+ return log_oom();
+
+ r = udev_device_get_is_initialized(d);
+ if (r < 0)
+ return log_error_errno(r, "Failed to check if device is initialized: %m");
+ if (r > 0) {
+ *ret = d;
+ d = NULL;
+ return 0;
+ }
+ d = udev_device_unref(d);
+
+ if (!monitor) {
+ monitor = udev_monitor_new_from_netlink(udev, "udev");
+ if (!monitor)
+ return log_oom();
+
+ r = udev_monitor_filter_add_match_subsystem_devtype(monitor, "block", NULL);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add block match: %m");
+
+ r = udev_monitor_enable_receiving(monitor);
+ if (r < 0)
+ return log_error_errno(r, "Failed to turn on monitor: %m");
+
+ continue;
+ }
+
+ pfd.fd = udev_monitor_get_fd(monitor);
+ if (pfd.fd < 0)
+ return log_error_errno(r, "Failed to get udev monitor fd: %m");
+
+ r = poll(&pfd, 1, -1);
+ if (r < 0)
+ return log_error_errno(errno, "Failed to wait for device initialization: %m");
+
+ d = udev_monitor_receive_device(monitor);
+ }
+
+ return 0;
+}
+
#define PARTITION_TABLE_BLURB \
"Note that the disk image needs to either contain only a single MBR partition of\n" \
"type 0x83 that is marked bootable, or follow\n" \
@@ -2659,9 +2718,9 @@ static int dissect_image(
if (fstat(fd, &st) < 0)
return log_error_errno(errno, "Failed to stat block device: %m");
- d = udev_device_new_from_devnum(udev, 'b', st.st_rdev);
- if (!d)
- return log_oom();
+ r = wait_for_block_device(udev, st.st_rdev, &d);
+ if (r < 0)
+ return r;
e = udev_enumerate_new(udev);
if (!e)