git-annex/doc/bugs/git-annex-sync_not_quite_idempotent__63__.mdwn

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### Please describe the problem.
I had thought that, after running git-annex-sync in a repo, running it again should always do nothing (if no remote has changed).
But I'm seeing an example where I have to run git-annex-sync twice for subsequent runs to do nothing.
### What steps will reproduce the problem?
See below. The repo has one submodule, in the directory viral-ngs/ .
### What version of git-annex are you using? On what operating system?
[[!format sh """
(master_env_v150_py36) 16:44 [viral-ngs-benchmarks] $ uname -a
Linux ip-172-31-80-189.ec2.internal 4.14.133-113.112.amzn2.x86_64 #1 SMP Tue Jul 30 18:29:50 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
(master_env_v150_py36) 16:46 [viral-ngs-benchmarks] $ git annex version
git-annex version: 7.20190730-g1030771
build flags: Assistant Webapp Pairing S3 WebDAV Inotify DBus DesktopNotify TorrentParser MagicMime Feeds Testsuite
dependency versions: aws-0.21.1 bloomfilter-2.0.1.0 cryptonite-0.25 DAV-1.3.3 feed-1.0.1.0 ghc-8.6.5 http-client-0.5.14 persistent-sql\
ite-2.9.3 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_2\
24 SHA3_384E SHA3_384 SKEIN256E SKEIN256 SKEIN512E SKEIN512 BLAKE2B256E BLAKE2B256 BLAKE2B512E BLAKE2B512 BLAKE2B160E BLAKE2B160 BLAKE\
2B224E BLAKE2B224 BLAKE2B384E BLAKE2B384 BLAKE2BP512E BLAKE2BP512 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: 5 7
upgrade supported from repository versions: 0 1 2 3 4 5 6
local repository version: 5
"""]]
### Please provide any additional information below.
[[!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
(master_env_v150_py36) 16:44 [viral-ngs-benchmarks] $ git annex sync
On branch is-import-rabies200
Your branch is up to date with 'origin/is-import-rabies200'.
It took 5.25 seconds to enumerate untracked files. 'status -uno'
may speed it up, but you have to be careful not to forget to add
new files yourself (see 'git help status').
nothing to commit, working tree clean
commit ok
remote: Enumerating objects: 1, done.
remote: Counting objects: 100% (1/1), done.
remote: Total 1 (delta 0), reused 1 (delta 0), pack-reused 0
Unpacking objects: 100% (1/1), done.
From github.com:broadinstitute/viral-ngs-benchmarks
1d808d3a08c..de7758ca784 is-import-rabies200 -> origin/is-import-rabies200
1d808d3a08c..de7758ca784 synced/is-import-rabies200 -> origin/synced/is-import-rabies200
Updating 1d808d3a08c..de7758ca784
Fast-forward
viral-ngs | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Already up to date.
pull origin ok
(master_env_v150_py36) 16:44 [viral-ngs-benchmarks] $ git annex sync
[is-import-rabies200 f3e0898cd33] git-annex in viral-ngs-benchmarks copy on /ilya
1 file changed, 1 insertion(+), 1 deletion(-)
commit ok
pull origin ok
Enumerating objects: 3, done.
Counting objects: 100% (3/3), done.
Delta compression using up to 8 threads
Compressing objects: 100% (2/2), done.
Writing objects: 100% (2/2), 946 bytes | 946.00 KiB/s, done.
Total 2 (delta 1), reused 0 (delta 0)
remote: Resolving deltas: 100% (1/1), completed with 1 local object.
To github.com:broadinstitute/viral-ngs-benchmarks.git
63fe6905f53..1d808d3a08c is-import-rabies200 -> synced/is-import-rabies200
push origin ok
(master_env_v150_py36) 16:42 [viral-ngs-benchmarks] $ git annex sync
On branch is-import-rabies200
Your branch is up to date with 'origin/is-import-rabies200'.
It took 5.36 seconds to enumerate untracked files. 'status -uno'
may speed it up, but you have to be careful not to forget to add
new files yourself (see 'git help status').
nothing to commit, working tree clean
commit ok
pull origin ok
# End of transcript or log.
"""]]
### Have you had any luck using git-annex before? (Sometimes we get tired of reading bug reports all day and a lil' positive end note does wonders)