Merge branch 'master' of ssh://git-annex.branchable.com

doc/bugs/wrong_permissions_of_unused__44___badunused_and_tmpunused__63__.mdwn

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+The files `unused`, `badunused` and `tmpunused` in `.git/annex/` do not have the correct permissions when the git repository is set to `--shared=group`. Such files are `600`, while they should be `660`, as other files in `.git/annex`.
+
+For this reason, when those files are created, they are accessibile only to one user (the owner), triggering errors when other users in the group attempt things like `git annex unused` or `git annex dropunused`. At least this occurs with git-annex 6.20171018+gitgbb20b1ed3-1~ndall+1 .
+
+To reproduce the problem:
+
+    git init --shared=group
+    git annex init
+    echo test > test
+    git annex add test
+    git commit -m test
+    git rm test
+    git commit -m removed
+    git annex unused
+
+you get:
+
+    unused . (checking for unused data...) (checking master...) 
+      Some annexed data is no longer used by any files:
+        NUMBER  KEY
+        1       SHA256E-s5--f2ca1bb6c7e907d06dafe4687e579fce76b37e4e93b7605022da52e6ccc26fd2
+      (To see where data was previously used, try: git log --stat -S'KEY')
+      
+      To remove unwanted data: git-annex dropunused NUMBER
+      
+    ok
+
+
+Conversely, from another user of the group you get:
+
+    > git annex unused
+    unused . (checking for unused data...) (checking master...) 
+      Some annexed data is no longer used by any files:
+        NUMBER  KEY
+        1       SHA256E-s5--f2ca1bb6c7e907d06dafe4687e579fce76b37e4e93b7605022da52e6ccc26fd2
+      (To see where data was previously used, try: git log --stat -S'KEY')
+      
+      To remove unwanted data: git-annex dropunused NUMBER
+      
+    
+    git-annex: .git/annex/unused: openFile: permission denied (Permission denied)
+    failed
+    git-annex: unused: 1 failed
+
+Moreover:
+
+    > git annex dropunused 1
+    git-annex: .git/annex/misctmp/mergedrefs.0: createDirectory: permission denied (Permission denied)
+
+
+This is somewhat expected, because the permissions of `unused`, `badunused` and `tmpunused` are `600`:
+
+    > ll .git/annex/
+    total 40
+    drwxrwsr-x 5 ele testgroup 4096 dic 19 14:50 ./
+    drwxrwsr-x 9 ele testgroup 4096 dic 19 14:50 ../
+    -rw------- 1 ele testgroup    0 dic 19 14:50 badunused
+    -rw-rw-r-- 1 ele testgroup  345 dic 19 14:49 index
+    -rw-rw-r-- 1 ele testgroup   41 dic 19 14:49 index.lck
+    drwxrwsr-x 2 ele testgroup 4096 dic 19 14:49 journal/
+    -rw-rw---- 1 ele testgroup    0 dic 19 14:49 journal.lck
+    -rw-rw-r-- 1 ele testgroup   62 dic 19 14:49 mergedrefs
+    drwxrwsr-x 2 ele testgroup 4096 dic 19 14:49 misctmp/
+    drwxrwsr-x 3 ele testgroup 4096 dic 19 14:49 objects/
+    -rw-rw---- 1 ele testgroup    0 dic 19 14:49 precommit.lck
+    -rw-rw-r-- 1 ele testgroup    0 dic 19 14:49 sentinal
+    -rw-rw-r-- 1 ele testgroup   21 dic 19 14:49 sentinal.cache
+    -rw------- 1 ele testgroup    0 dic 19 14:50 tmpunused
+    -rw------- 1 ele testgroup  101 dic 19 14:50 unused
+
+If this is the intended behavior, could you please explain me how to use `git annex unused` and `dropunused` in a shared repository?

doc/bugs/wrong_permissions_of_unused__44___badunused_and_tmpunused__63__/comment_1_ca6b7e3d5d83d2dd6532533ecdb965c3._comment

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+[[!comment format=mdwn
+ username="emanuele"
+ nickname="emanuele.olivetti"
+ avatar="http://cdn.libravatar.org/avatar/f51cc5c6c3a0eb28faa6491c3cbcfcce"
+ subject="comment 1"
+ date="2017-12-19T14:19:14Z"
+ content="""
+Notice that, if I manually change the permsissions of `unused`, `badunused` and `tmpunused` to `660`, then other another user of the group can do `git annex unused` and `git annex dropunused 1` without errors. Unfortunately, after `git annex unused`, the ownership of `unused`, `badunused` and `tmpunused` changes from the initial user to the new user, and permissions are reset to `600`, which re-creates the initial problem.
+"""]]