/etc/libguestfs-tools.conf is in libguestfs-tools 1:1.36.13-1ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | # /etc/libguestfs-tools.conf or .libguestfs-tools.rc
#
# See libguestfs-tools.conf(5) man page for documentation.
#
# Uncomment the following line to make guestfish, guestmount,
# virt-rescue be read-only by default (as if the --ro flag was given).
# If it is commented out then the default is read-write. Note that
# the semi-colon (;) is required.
#read_only = true;
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