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For each drive added, return the name. For example calling this with
index 0 will return the string "/dev/sda". I called it
guestfs_device_name (not drive_name) for consistency with the existing
guestfs_device_index function.
You don't really need to call this function. You can follow the
advice here:
https://libguestfs.org/guestfs.3.html#block-device-naming
and assume that drives are added with predictable names like
"/dev/sda", "/dev/sdb", etc.
However it's useful to expose the internal guestfs_int_drive_name
function since especially handling names beyond index 26 is tricky
(https://rwmj.wordpress.com/2011/01/09/how-are-linux-drives-named-beyond-drive-26-devsdz/)
Fixes: https://github.com/libguestfs/libguestfs/issues/80
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
(cherry picked from commit ac00e603f8)