(I tried searching the issue tracker but it was extremely unresponsive;
apologies if this is already in there (which seems likely))
Initially encountered on Windows (most recent TortoiseSVN).
Reproduced on Linux (Debian testing, subversion-1.10.3-1).
The help for svn diff suggests that it supports peg revisions (TARGET[@REV]).
However, this does not seem to be the case.
In fact, while most (all?) other svn commands will treat 'foo' and 'foo@' as
equivalent file names, svn diff does not; 'svn diff foo@' (when only 'foo'
exists) will result in E155010 (the node was not found).
(This seems part of SVN-3231.)
In addition, there is a significant bug in handling of file names starting with
@; a diff for them can only be acquired by running 'svn diff' in their
directory and using './<filename>'.
(I don't immediately see a ticket for this case.)
Reproduction case: create a new repo containing 2 files: foo/@bar and foo/xy@zzy
Check out the repository (messages below will assume it is in /wc):
$ cd /wc
$ svn diff foo/@bar
svn: E155010: The node '/wc/foo@bar' was not found.
$ svn diff foo/@bar@
svn: E155010: The node '/wc/foo@bar@' was not found.
$ svn diff foo/xy@zzy
$ svn diff foo/xy@zzy@
svn: E155010: The node '/wc/foo/xy@zzy@' was not found.
$ cd foo
$ svn diff @bar
svn: E125001: '@bar' is just a peg revision. Maybe try '@bar@' instead?
$ svn diff @bar@
svn: E155010: The node '/wc/foo/@bar' was not found.
$ svn diff ./@bar
$ svn diff ./@bar@
svn: E155010: The node '/wc/foo/@bar@' was not found.
So:
* the normal 'append-@-to-avoid-peg-revision' syntax does not work (but in
some cases the error message suggests using it)
* files containing @ anywhere but at the start work fine
* files with @ at the start seem to lose the directory separator in front
of it, breaking diff operation
* exception: using ./ as path while in the file's directory (so luckily
this means I have a workaround)
