### Please describe the problem.

This is actually two (related) bugs.
I discovered the second by means of troubleshooting the first.

One issue I've had with a portable repo is when I init it from my arch machine it sets up everything as expected.
When I try to use that drive with my raspberry pi, however, there are some new git hooks (or at least one) that the older version of git annex (still the latest available in the Pi's repos, 2016, which is really old :/) does not support. 

What is necessary to get a newer version of git-annex available in the Raspbian repos for default users? I know I can just install the tarball (and I'm considering it) but for everyone else coming upon this issue...

### What steps will reproduce the problem?
See above. git-annex init on a newer system, then mount it as a drive on a Raspberry pi (with the older git-annex installed) and set up the pi as a remote. Then git-annex sync.

Note: this is fixable by deleting the post-receive hook in the .git/hooks folder. I'm just not sure that's a great idea.

### What version of git-annex are you using? On what operating system?
Arch linux: 

git-annex version: 6.20180913-g547d01fd0
build flags: Assistant Webapp Pairing S3(multipartupload)(storageclasses) WebDAV Inotify DBus DesktopNotify ConcurrentOutput TorrentParser MagicMime Feeds Testsuite
dependency versions: aws-0.20 bloomfilter-2.0.1.0 cryptonite-0.25 DAV-1.3.2 feed-1.0.0.0 ghc-8.4.3 http-client-0.5.13.1 persistent-sqlite-2.8.2 torrent-10000.1.1 uuid-1.3.13 yesod-1.6.0
key/value backends: SHA256E SHA256 SHA512E SHA512 SHA224E SHA224 SHA384E SHA384 SHA3_256E SHA3_256 SHA3_512E SHA3_512 SHA3_224E SHA3_224 SHA3_384E SHA3_384 SKEIN256E SKEIN256 SKEIN512E SKEIN512 BLAKE2B256E BLAKE2B256 BLAKE2B512E BLAKE2B512 BLAKE2B160E BLAKE2B160 BLAKE2B224E BLAKE2B224 BLAKE2B384E BLAKE2B384 BLAKE2S256E BLAKE2S256 BLAKE2S160E BLAKE2S160 BLAKE2S224E BLAKE2S224 BLAKE2SP256E BLAKE2SP256 BLAKE2SP224E BLAKE2SP224 SHA1E SHA1 MD5E MD5 WORM URL
remote types: git gcrypt p2p S3 bup directory rsync web bittorrent webdav adb tahoe glacier ddar hook external
operating system: linux x86_64
supported repository versions: 3 5 6
upgrade supported from repository versions: 0 1 2 3 4 5
local repository version: 5


Raspberry Pi:

git-annex version: 6.20160923
build flags: Assistant Webapp Pairing Testsuite S3(multipartupload)(storageclasses) WebDAV Inotify DBus DesktopNotify XMPP ConcurrentOutput TorrentParser MagicMime Feeds Quvi
key/value backends: SHA256E SHA256 SHA512E SHA512 SHA224E SHA224 SHA384E SHA384 SHA3_256E SHA3_256 SHA3_512E SHA3_512 SHA3_224E SHA3_224 SHA3_384E SHA3_384 SKEIN256E SKEIN256 SKEIN512E SKEIN512 SHA1E SHA1 MD5E MD5 WORM URL
remote types: git gcrypt S3 bup directory rsync web bittorrent webdav tahoe glacier ddar hook external
local repository version: 5
supported repository versions: 5 6
upgrade supported from repository versions: 0 1 2 3 4 5
operating system: linux arm




### Please provide any additional information below.

I've also noticed a bug with tab complete on the latest git-annex when in a folder that is not git-annexed. I was looking into git-annex post-receive, and typed git-annex pos<TAB><TAB> to get a listing of possible outputs. This was the result:



[[!format sh """
# If you can, paste a complete transcript of the problem occurring here.
# If the problem is with the git-annex assistant, paste in .git/annex/daemon.log

tai@trasa:~$ git-annex post-receive git-annex: Not in a git repository.
git-annex: Not in a git repository.

Display all 105 possibilities? (y or n)^C
tai@trasa:~$



# End of transcript or log.
"""]]

I did not hit enter, the script just failed on me during tab-complete and exited.

Thanks, I look forward to any response from the community this might get.

> [[fixed|done]] --[[Joey]]
