I've posted most of the fix for this:

https://www.redhat.com/archives/libguestfs/2016-August/msg00138.html

The above (mostly-) fix will be upstream in >= 1.34.1.

I can reproduce the bug with build:
libguestfs-bash-completion-1.32.7-3.el7.noarch

Verify the bug with build:
libguestfs-bash-completion-1.36.2-2.el7.noarch
libguestfs-1.36.2-2.el7.x86_64

Steps:
1.Install libguestfs-bash-completion and libguestfs related packages on the test server

2.Verify whether there is bash completion scripts for virt-diff
#virt-diff -<tab>
-a                 -c                 -d                 --dir-nlinks       --extra-stat       --human-readable   --times            -V                 --xattrs           
-A                 --checksum         -D                 --dir-time         --extra-stats      --keys-from-stdin  --time-t           --verbose          
--add              --checksums        --dir-link         --dir-times        --format           --time             --uid              --version          
--all              --connect          --dir-links        --domain           -h                 --time-days        --uids             -x                 
--atime            --csv              --dir-nlink        --echo-keys        --help             --time-relative    -v                 --xattr            

Result:
Can't get the short options and long options by typing tab at first time, but could get the options normaly after typing the tab at second time


3.Verify whether there is bash completion scripts for guestunmount,virt-copy-in,virt-copy-out, virt-customize, virt-get-kernel, virt-p2v-make-disk, virt-p2v-make-kickstart, virt-tar-in and virt-tar-out, get same result with step2


4.Verify whether there is bash completion scripts for virt-v2v-copy-to-local
# virt-v2v-copy-to-local -<tab>
nothing

Result:
Can't get the short options and long options by typing tab for virt-v2v-copy-to-local command

Hi rjones,

Pls help check the results of step2 and step4, and I don't know where could download virt-win-reg rpm pkg

You probably have to start a new shell/terminal in order to get the
completion scripts (they are loaded by bash when it starts up).

Step 2 looks OK if you get tab completion for those commands.

I notice that we forgot to add tab completion to virt-v2v-copy-to-local
upstream which is why it doesn't work.  I posted a fix for that:

https://www.redhat.com/archives/libguestfs/2017-March/msg00247.html

Upstream in commit:
2f25d23ac85bbc341459da03da6cfa6d85dae8dc
and in libguestfs >= 1.37.7.

Verify the bug with builds again:
libguestfs-bash-completion-1.36.2-3.el7.noarch
libguestfs-1.36.2-3.el7.x86_64
libguestfs-tools-1.36.2-3.el7.noarch


Steps:
1.Verify whether there is bash completion scripts for virt-v2v-copy-to-local
# virt-v2v-copy-to-local -<tab>
--color          --colours        --ic             --quiet          --verbose        
--colors         --debug-gc       --password-file  -v               --version        
--colour         --help           -q               -V               -x             

Result:
Can get the short options and long options by typing tab two times

2.Verify whether there is bash completion scripts for virt-diff,guestunmount,virt-copy-in,virt-copy-out, virt-customize, virt-get-kernel, virt-p2v-make-disk, virt-p2v-make-kickstart, virt-tar-in and virt-tar-out, get same result with step1

3..Verify whether there is bash completion scripts for virt-win-reg
#virt-win-reg -<tab>
nothing

Result:
Can't get the short options and long options by typing tab for virt-win-reg

Tab completion added for virt-win-reg too:

https://www.redhat.com/archives/libguestfs/2017-March/msg00277.html

Verify the bug with builds:
libguestfs-1.36.3-1.el7.x86_64
libguestfs-tools-1.36.3-1.el7.noarch
libguestfs-bash-completion-1.36.3-1.el7.noarch


Steps:
1.Verify whether there is bash completion scripts for virt-win-reg
# virt-win-reg -<tab>
-?                          --format
-c                          --help
--connect                   --merge
-d                          --unsafe-printable-strings
--debug                     --version


Result:
Can get the short options and long options for virt-win-reg by typing tab two times

2.Verify whether there is bash completion scripts for virt-diff,guestunmount,virt-copy-in,virt-copy-out, virt-customize, virt-get-kernel, virt-p2v-make-disk, virt-p2v-make-kickstart, virt-tar-in,virt-tar-out and virt-v2v-copy-to-local, get same result with step1

So the bug has been fixed, move the bug from ON_QA to VERIFIED

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:2023