dissect-image: Explicitly remove partitions when done with image

When closing a loop device, the kernel will asynchronously remove
the probed partitions. This can lead to race conditions where we
try to reuse a partition device that still needs to be removed by
the kernel. To avoid such issues, let's explicitly try to remove
any partitions using BLKPG_DEL_PARTITION when we're done with an
image.

To make sure we don't try to remove partitions when we want them
to remain (e.g. systemd-dissect --mount), we add
dissected_image_relinquish() in a similar vein to loop_device_relinquish()
and decrypted_image_relinquish().

1 files changed, 1 insertions, 0 deletions

diff --git a/src/sysext/sysext.c b/src/sysext/sysext.c
index 364af195e0..002ebb09f8 100644
--- a/src/sysext/sysext.c
+++ b/src/sysext/sysext.c
@@ -584,6 +584,7 @@ static int merge_subprocess(Hashmap *images, const char *workspace) {
                                         return log_error_errno(r, "Failed to relinquish DM devices: %m");
                         }
 
+                        dissected_image_relinquish(m);
                         loop_device_relinquish(d);
                         break;
                 }