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doc/forum/Can_you_use_git_annex_on_gocryptfs__63__/comment_5_a1f8d718be941f4dd5e7b06fd6431c10._comment Normal file
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[[!comment format=mdwn
username="dpifke"
avatar="http://cdn.libravatar.org/avatar/7b17ce0661a1b1cd708c5c5150eb2c33"
subject="comment 5"
date="2023-03-23T23:43:17Z"
content="""
Some additional experiments:
```
$ stat Invoice.pdf
File: Invoice.pdf
Size: 54623 Blocks: 112 IO Block: 4096 regular file
Device: bfh/191d Inode: 294625 Links: 1
Access: (0444/-r--r--r--) Uid: ( 1000/ dave) Gid: ( 1000/ dave)
Access: 2023-03-23 17:28:30.299963443 -0600
Modify: 2023-03-23 17:19:56.731965402 -0600
Change: 2023-03-23 17:28:30.299963443 -0600
Birth: -
$ sha256sum Invoice.pdf
868cb65310f5ef46fcd4f7d85fb364347ea9047766cadcf3d184a8c704164b90 Invoice.pdf
$ stat Invoice.pdf
File: Invoice.pdf
Size: 54623 Blocks: 112 IO Block: 4096 regular file
Device: bfh/191d Inode: 294625 Links: 1
Access: (0444/-r--r--r--) Uid: ( 1000/ dave) Gid: ( 1000/ dave)
Access: 2023-03-23 17:35:38.303961810 -0600
Modify: 2023-03-23 17:19:56.731965402 -0600
Change: 2023-03-23 17:28:30.299963443 -0600
Birth: -
```
From the above, I can see that `-ko noatime` doesn't do anything, but the ctime change is something unique to git-annex, not just from opening and reading file contents. (I've used git-annex on filesystems without noatime before, so I didn't think noatime support was mandatory?)
But wait... why is the file 0444?
```
$ chmod 644 Invoice.pdf
$ stat Invoice.pdf
File: Invoice.pdf
Size: 54623 Blocks: 112 IO Block: 4096 regular file
Device: bfh/191d Inode: 294625 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 1000/ dave) Gid: ( 1000/ dave)
Access: 2023-03-23 17:35:38.303961810 -0600
Modify: 2023-03-23 17:19:56.731965402 -0600
Change: 2023-03-23 17:38:04.539961252 -0600
Birth: -
```
OK, so setting it back to 0644 modifies ctime.
```
$ git annex add Invoice.pdf
add Invoice.pdf
Invoice.pdf changed while it was being added
failed
add: 1 failed
$ stat Invoice.pdf
File: Invoice.pdf
Size: 54623 Blocks: 112 IO Block: 4096 regular file
Device: bfh/191d Inode: 294625 Links: 1
Access: (0444/-r--r--r--) Uid: ( 1000/ dave) Gid: ( 1000/ dave)
Access: 2023-03-23 17:38:28.999961159 -0600
Modify: 2023-03-23 17:19:56.731965402 -0600
Change: 2023-03-23 17:38:28.999961159 -0600
Birth: -
```
And running `git annex add` changes it back to 0444, *and* updates ctime. So that's why that change is being observed.
So I don't think gocryptfs is doing anything unexpected w.r.t. modifying the file out from under git-annex. Is there a way to get more detailed information about what git-annex thinks has changed?
"""]]