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-
-qemu-img rebase error message mentions wrong file name
-
-While doing 'qemu-img rebase' for linking to a different backing file, if the old backing file does not exist, the command fails. During this failure, the error message shown is misleading.
-e.g. qemu-img rebase -b <backing_file> <filename> throws error saying "Could not open <filename>"
-Ideally it should "Could not open <old_backing_file>"
-
-snippet -
-[root@oxy-dev ~]# qemu-img info /opt/stack/data/nova/instances/94864a64-ebf8-45e6-a777-615921216a0a/disk
-image: /opt/stack/data/nova/instances/94864a64-ebf8-45e6-a777-615921216a0a/disk
-file format: qcow2
-virtual size: 20G (21474836480 bytes)
-disk size: 174M
-cluster_size: 65536
-backing file: /tmp/3559241a79b79ae663ec6e3d9b75d469967b383b
-Format specific information:
-    compat: 1.1
-    lazy refcounts: false
-[root@oxy-dev ~]# mv /tmp/3559241a79b79ae663ec6e3d9b75d469967b383b /tmp/3559241a79b79ae663ec6e3d9b75d469967b383a
-[root@oxy-dev ~]# file !$
-file /tmp/3559241a79b79ae663ec6e3d9b75d469967b383a
-/tmp/3559241a79b79ae663ec6e3d9b75d469967b383a: x86 boot sector; partition 1: ID=0x83, active, starthead 32, startsector 2048, 409600 sectors; partition 2: ID=0x8e, starthead 159, startsector 411648, 16365568 sectors, code offset 0xc0
-[root@oxy-dev ~]# file /tmp/3559241a79b79ae663ec6e3d9b75d469967b383b
-/tmp/3559241a79b79ae663ec6e3d9b75d469967b383b: cannot open (No such file or directory)
-[root@oxy-dev ~]# qemu-img rebase -b /tmp/3559241a79b79ae663ec6e3d9b75d469967b383a /opt/stack/data/nova/instances/94864a64-ebf8-45e6-a777-615921216a0a/disk
-qemu-img: Could not open '/opt/stack/data/nova/instances/94864a64-ebf8-45e6-a777-615921216a0a/disk': Could not open file: No such file or directory
-[root@oxy-dev ~]# 
-qemu-img version 1.5.3
-OS: RHEL7 - 3.10.0-229
-libvirtd (libvirt) 1.2.8
-
-I'm pretty sure this is working as intended.
-If you observe the code, qemu-img first opens filename. When qemu opens a file, it needs full access to it's chain of backing files - Hence, if the old backing file does not exist, opening filename fails.
-
-(Not an active qemu dev, just passing through)
-
-The full story is that in 2015, qemu probably did not note that it failed to open the overlay (<filename>) because it failed to open the backing file.  It does that, now, though:
-
-$ qemu-img rebase -b new.qcow2 top.qcow2 
-qemu-img: Could not open 'top.qcow2': Could not open backing file: Could not open 'base.qcow2': No such file or directory
-
-So that should be a fix.
-
-Max
-
-What to do if the old file has been moved? 
-
-Say the backing file was /path/to/os.qcow2 and it was moved to /new/path/to/os.qcow2.
-
-How can we tell snapshot.qcow2 to update the backing file from /path/to/os.qcow2 to /new/path/to/os.qcow2?
-