templater: extract helper that evaluates filter or function argument It will be used to get a date tuple from an argument. Perhaps some of "stringify(args[n][0], ...)" can be replaced by this function.

contrib: add showstack extension This allows getting a Python stack trace at any time on Unix by hitting Ctrl-\ (or Ctrl-T on BSDs). Useful for debugging mysterious hangs on the fly. Sample output: $ hg log -k nosuchmessage ^\ File "/home/mpm/hg/mercurial/revset.py", line 3089, in _iterfilter if cond(x): File "/home/mpm/hg/mercurial/util.py", line 415, in f cache[arg] = func(arg) File "/home/mpm/hg/mercurial/revset.py", line 1215, in matches for t in c.files() + [c.user(), c.description()]) File "/home/mpm/hg/mercurial/context.py", line 525, in files return self._changeset[3] File "/home/mpm/hg/mercurial/util.py", line 531, in __get__ result = self.func(obj) File "/home/mpm/hg/mercurial/context.py", line 498, in _changeset return self._repo.changelog.read(self.rev()) File "/home/mpm/hg/mercurial/changelog.py", line 338, in read text = self.revision(node) File "/home/mpm/hg/mercurial/revlog.py", line 1092, in revision bins = self._chunks(chain) File "/home/mpm/hg/mercurial/revlog.py", line 1013, in _chunks ladd(decompress(buffer(data, chunkstart - offset, chunklength))) File "/home/mpm/hg/mercurial/revlog.py", line 91, in decompress return _decompress(bin) ----

Added signature for changeset 1a45e49a6bed

Added tag 3.5.1 for changeset 1a45e49a6bed

hgweb: fix trust of templates path (BC) Long ago we disabled trust of the templates path with a comment describing the (insecure) behavior before the change. At some later refactor, the code was apparently changed back to match the comment, unaware that the intent of the comment was to describe the behavior to avoid. This change disables the trust and updates the comment to explicitly say not only what the old problem was, but also that it was in fact a problem and the action taken to prevent it. Impact: prior to this change, if you had a UNIX-based hgweb server where users can write hgrc files, those users could potentially read any file readable by the web server. This is marked as a backwards compatibility issue because people may have configured templates without proper trust settings. Issue spotted by Greg Szorc.

wix: avoid an abort with 'hg help -k foo' Previously: $ /c/Program\ Files/Mercurial/hg help -k merge-tools abort: No such file or directory: c:\Program Files\Mercurial\help\scripting.txt The Inno installer seems OK, but the TortoiseHg required the same fix. That got queued with an additional change of 'helpFolder.guid' in guids.wxi (probably by Steve). I'm not sure if that is necessary here too.

revlog: add an aggressivemergedelta option This adds an option for delta'ing against both p1 and p2 when applying merge revisions and picking whichever is smallest. Some before and after stats on manifest.d size: internal large repo: before: 1.2 GB after: 930 MB mozilla-central: before: 261 MB after: 92 MB

revlog: change generaldelta delta parent heuristic The old generaldelta heuristic was "if p1 (or p2) was closer than the last full text, use it, otherwise use prev". This was problematic when a repo contained multiple branches that were very different. If commits to branch A were pushed, and the last full text was branch B, it would generate a fulltext. Then if branch B was pushed, it would generate another fulltext. The problem is that the last fulltext (and delta'ing against `prev` in general) has no correlation with the contents of the incoming revision, and therefore will always have degenerate cases. According to the blame, that algorithm was chosen to minimize the chain length. Since there is already code that protects against that (the delta-vs-fulltext code), and since it has been improved since the original generaldelta algorithm went in (2011), I believe the chain length criteria will still be preserved. The new algorithm always diffs against p1 (or p2 if it's closer), unless the resulting delta will fail the delta-vs-fulltext check, in which case we delta against prev. Some before and after stats on manifest.d size. internal large repo old heuristic - 2.0 GB new heuristic - 1.2 GB mozilla-central old heuristic - 242 MB new heuristic - 261 MB The regression in mozilla central is due to the new heuristic choosing p2r as the delta when it's closer to the tip. Switching the algorithm to always prefer p1r brings the size back down (242 MB). This is result of the way in which mozilla does merges and pushes, and the result could easily swing the other direction in other repos (depending on if they merge X into Y or Y into X), but will never be as degenerate as before. I future patch will address the regression by introducing an optional, even more aggressive delta heuristic which will knock the mozilla manifest size down dramatically.

revlog: move textlen calculation to be above delta chooser This moves the textlen calculation to be above the delta chooser. Since textlen is needed for calling isgooddelta, we need it above the delta chooser so future patches can call isgooddelta.

revlog: move delta check to it's own function This moves the delta vs fulltext comparison to its own function. This will allow us to reuse the function in future patches for more efficient delta choices. As a side effect, this will also allow extensions to modify our delta criteria.