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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
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