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The Date resolution of the FAT filesystem is only 2 seconds for the "last modified time."
This leads to the strange behaviour, that after umount and remount of an usb drive (direct mode) git-annex thinks that suddenly approx. 50% of
the files are modified. (after remount the "seconds" appears to be rounded to even values - the inode cache before unmount had 1 second resolution) So git-annex is not real "guilty" but it would be fine to create a "workaround" for this problem...
Possible the best solution for this is to set even values for the seconds in the filesystem and in annex internal tables direct after the `git annex get`.
Other solution would be to treat differences up to 1s in modification time as unmodified or create an new parameter like rsync's "modify-window" for this. To do an `git annex sync` or `git annex add` is in my opinion not a good option, because one could add so Bad file content by accident...
Here's an konsole session to show this behaviour:
$ mount /mnt/transfer/
$ git clone source/ /mnt/transfer/transfer-repo
Klone nach '/mnt/transfer/transfer-repo'...
Fertig.
$ cd /mnt/transfer/transfer-repo/
$ git annex init "test"
init test
Detected a filesystem without fifo support.
Disabling ssh connection caching.
Detected a crippled filesystem.
Enabling direct mode.
ok
(Recording state in git...)
$ git annex group here transfer
group here (merging origin/git-annex into git-annex...)
(Recording state in git...)
ok
(Recording state in git...)
$ git annex wanted here standard
wanted here ok
(Recording state in git...)
$ git annex get --auto
get n01.mp3 (from origin...)
SHA256E-s1159018--5674452792970dc03e9ba47d3a8af5ad7c8da6b3ca19e8e64b9a4cf462d4a92d.mp3
1159018 100% 82.62MB/s 0:00:00 (xfer#1, to-check=0/1)
sent 1159308 bytes received 31 bytes 2318678.00 bytes/sec
total size is 1159018 speedup is 1.00
ok
get n02.mp3 (from origin...)
SHA256E-s1622113--03998dc10c4839d5ab9aeaceaa63f0363c9d728aaaca2a2707f025c7b9e920a3.mp3
1622113 100% 34.45MB/s 0:00:00 (xfer#1, to-check=0/1)
sent 1622459 bytes received 31 bytes 3244980.00 bytes/sec
total size is 1622113 speedup is 1.00
ok
...
...
–--> All 29 files (n01.mp3 to n29.mp3) successfully got
(Recording state in git...)
$ git annex status
$ stat * >../stat-before-umount
$ cd /
$ umount /mnt/transfer
$ mount /mnt/transfer
$ cd /mnt/transfer/transfer-repo
$ stat * >../stat-after-remount
$ git annex status
M n05.mp3
M n10.mp3
M n11.mp3
M n13.mp3
M n16.mp3
M n17.mp3
M n20.mp3
M n22.mp3
M n23.mp3
M n24.mp3
M n26.mp3
M n27.mp3
$ diff -u ../stat-before-umount ../stat-after-remount | grep -B8 "+Modifiziert" | grep -E "Datei:|Modifi"
Datei: „n05.mp3“
-Modifiziert: 2014-05-03 19:42:39.000000000 +0200
+Modifiziert: 2014-05-03 19:42:38.000000000 +0200
Datei: „n10.mp3“
-Modifiziert: 2014-05-03 19:43:05.000000000 +0200
+Modifiziert: 2014-05-03 19:43:04.000000000 +0200
Datei: „n11.mp3“
-Modifiziert: 2014-05-03 19:43:07.000000000 +0200
+Modifiziert: 2014-05-03 19:43:06.000000000 +0200
Datei: „n13.mp3“
-Modifiziert: 2014-05-03 19:43:15.000000000 +0200
+Modifiziert: 2014-05-03 19:43:14.000000000 +0200
Datei: „n16.mp3“
-Modifiziert: 2014-05-03 19:43:21.000000000 +0200
+Modifiziert: 2014-05-03 19:43:20.000000000 +0200
Datei: „n17.mp3“
-Modifiziert: 2014-05-03 19:43:29.000000000 +0200
+Modifiziert: 2014-05-03 19:43:28.000000000 +0200
Datei: „n20.mp3“
-Modifiziert: 2014-05-03 19:43:53.000000000 +0200
+Modifiziert: 2014-05-03 19:43:52.000000000 +0200
Datei: „n22.mp3“
-Modifiziert: 2014-05-03 19:44:13.000000000 +0200
+Modifiziert: 2014-05-03 19:44:12.000000000 +0200
Datei: „n23.mp3“
-Modifiziert: 2014-05-03 19:44:23.000000000 +0200
+Modifiziert: 2014-05-03 19:44:22.000000000 +0200
Datei: „n24.mp3“
-Modifiziert: 2014-05-03 19:44:31.000000000 +0200
+Modifiziert: 2014-05-03 19:44:30.000000000 +0200
Datei: „n26.mp3“
-Modifiziert: 2014-05-03 19:44:35.000000000 +0200
+Modifiziert: 2014-05-03 19:44:34.000000000 +0200
Datei: „n27.mp3“
-Modifiziert: 2014-05-03 19:44:39.000000000 +0200
+Modifiziert: 2014-05-03 19:44:38.000000000 +0200
> fixed [[done]] --[[Joey]]
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