	US 12,135,896 B2
	Side-effect resistant operation testing
Takuya Mishina, Kanagawa (JP); Yasuharu Katsuno, Kawasaki (JP); Takahide Nogayama, Kanagawa (JP); and Fumiko Akiyama, Tokyo (JP)
Assigned to INTERNATIONAL BUSINESS MACHINES CORPORATION, Armonk, NY (US)
Filed by INTERNATIONAL BUSINESS MACHINES CORPORATION, Armonk, NY (US)
Filed on Aug. 1, 2019, as Appl. No. 16/529,184.
Prior Publication US 2021/0034279 A1, Feb. 4, 2021
Int. Cl. G06F 3/06 (2006.01); G06F 16/901 (2019.01)

CPC G06F 3/0653 (2013.01) [G06F 3/0604 (2013.01); G06F 3/0667 (2013.01); G06F 3/0674 (2013.01); G06F 16/9017 (2019.01)]

25 Claims

1. A method to create a side-effect free operation test system, comprising:

removing all contents of an existing directory of a container image in a memory,

creating a copy of a directory set of at least a part of a host system disk in the existing directory after removing the contents,

creating a separate link to each file in a first directory in the host system disk, in a second directory of the copy of the directory set, wherein the second directory corresponds in position to the first directory in the directory set, and

starting a non-privileged system using a disk image including the copy of the directory set and the created link.