When executed script with following arguments:
--repo JDK/8u152/ --apptop output/ --staging-name tmpo --force-destination-name jdk --log logs/test2.log
getting 'upgradeJDK.sh: line 931: logs/test2.log: No such file or directory' repeatedly as below:
[2018-05-15 11:35:13 ] Entering step: postCopyHotspotRC
[2018-05-15 11:35:13 ] Entering step: postCopyContent
[2018-05-15 11:35:13 ] PostCopy: Examining jdk.bak for copy-forward content.
[2018-05-15 11:35:13 ] PostCopy: Using 'jdk.bak' as the source for post-upgrade, copied files
[2018-05-15 11:35:13 ] PostCopy: Starting 2 copy operations...
upgradeJDK.sh: line 931: logs/test2.log: No such file or directory
upgradeJDK.sh: line 931: logs/test2.log: No such file or directory
upgradeJDK.sh: line 931: logs/test2.log: No such file or directory
upgradeJDK.sh: line 931: logs/test2.log: No such file or directory
[2018-05-15 11:35:13 ] PostCopy: Done.

This is the case when i am upgrading JDK in output directory where one JDK is already installed (output/jdk). PFA log file.