Sleep for a while if necessary to allow disks to wake up (#1916).

diff --git a/src/lib/ext.cc b/src/lib/ext.cc
index b88a88726b99c6f79fc5b91398b2a54487ec8281..39c90ae124e0f547f0e4e48ae29436c8d20e7f65 100644 (file)
--- a/src/lib/ext.cc
+++ b/src/lib/ext.cc
@@ -331,6 +331,18 @@ try
        file_windows_partition_set (bdevs.partitions[0].part_offset, bdevs.partitions[0].part_size);
 #else
        file_dev_name_set (posix_partition.c_str());
+
+       /* On macOS (at least) if you try to write to a drive that is sleeping the ext4_mkfs call
+        * below is liable to return EIO because it can't open the device.  Try to work around that
+        * here by opening and closing the device, waiting 5 seconds if it fails.
+        */
+       int wake = open(posix_partition.c_str(), O_RDWR);
+       if (wake == -1) {
+               dcpomatic_sleep_seconds (5);
+       } else {
+               close(wake);
+       }
+
        bd = file_dev_get ();
 #endif