/usr/share/fish/completions/apt-cdrom.fish is in fish-common 2.4.0-1.
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 11 12 13 | #apt-cdrom
complete -c apt-cdrom -s h -l help --description "Display help and exit"
complete -r -c apt-cdrom -a add --description "Add new disc to source list"
complete -x -c apt-cdrom -a ident --description "Report identity of disc"
complete -r -c apt-cdrom -s d -l cdrom --description "Mount point"
complete -f -c apt-cdrom -s r -l rename --description "Rename a disc"
complete -f -c apt-cdrom -s m -l no-mount --description "No mounting"
complete -f -c apt-cdrom -s f -l fast --description "Fast copy"
complete -f -c apt-cdrom -s a -l thorough --description "Thorough package scan"
complete -f -c apt-cdrom -s n -l no-act --description "No changes"
complete -f -c apt-cdrom -s v -l version --description "Display version and exit"
complete -r -c apt-cdrom -s c -l config-file --description "Specify config file"
complete -x -c apt-cdrom -s o -l option --description "Specify options"
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