At the moment when two items to be saved have the same directory name,
restic only saves the first one to the repo. Let's say we have a
structure like this:
dir1
└── subdir
└── file
dir2
└── subdir
└── file
When restic is run on `dir1/subdir` and `dir2/subdir`, it will only save
the first `subdir`:
$ restic backup dir1/subdir dir2/subdir
[...]
$ restic ls -l latest
drwxr-xr-x 1000 100 0 2017-08-27 20:56:39 /subdir
-rw-r--r-- 1000 100 17 2017-08-27 20:56:39 /subdir/file
That's obviously a bad thing, caused by an early decision to strip the
full path to the files/dirs to save and only leave the last directory.
This commit partly resolves this by handling colliding names and
resolving the conflicts. Restic will now append a counter to the file
(`-123`) until the conflict is resolved. So in the example above, we'll
end up with the following structure:
$ restic ls -l latest
drwxr-xr-x 1000 100 0 2017-08-27 20:56:39 /subdir
-rw-r--r-- 1000 100 17 2017-08-27 20:56:39 /subdir/file
drwxr-xr-x 1000 100 0 2017-08-27 20:56:46 /subdir-1
-rw-r--r-- 1000 100 17 2017-08-27 20:56:46 /subdir-1/file
This partly addresses #549 and closes#1179.
At first I thought that the obvious correction would be to archive the
full path. But it turns out that collisions may still occur: Suppose you
have a file named `foo` in the current directory, and the parent directory
also contains a file `foo`. Archiving these with restic also causes a
collision, since restic strips the `../` from the first file:
$ restic backup ../foo foo
This also happens with `tar`, which does not handle the collision and
will happily archive two files called `foo`.
So, the best way forward is to handle name collisions and archive the
whole path. The latter will be tackled in a separate PR.
Match/ChildMatch accept a ** pattern which is not noted in the doc
string, nor do any of the docs or tests specify whether the match is
greedy (i.e., can 'foo/**/bar' match paths with additional intermediate
bar directories?).
Add a note to the doc string and add test cases for greedy matches.
* append operates on len, not cap (not a bug since len is set to cap above, but let's avoid the confusion)
* no need to extend ciphertext again to cap after we made it big enough
* make consistent use of ciphertext[:ivSize] vs iv[:]
* make all input problems errors and impossible/catastrophic cases panics
An exclude filter is basically a 'wildcard but foo', so even if a
childMayMatch, other children of a dir may not, therefore childMayMatch
does not matter, but we should not go down unless the dir is selected
for restore.
This improves restore performance by several orders of magniture by not
going through the whole tree recursively when we can anticipate that no
match will ever occur.
Alexander Neumann