changelog: use "vfs.rename()" instead of "util.rename()"

vfs: add "open()" for newly added code paths which open files via vfs This patch replaces "open()" by own "__call__()" defined in derived classes at the first invocation, for efficiency of succeeding invocations.

bookmarks: use "vfs.utime()" instead of "os.utime()"

bookmarks: use "vfs.unlink()" instead of "util.unlink()"

cmdutil: use None as default value for "function pointer" instead of False Less type confusion.

graft: make skip messages more helpful This makes it possible for the user to understand and accept or work around what is happening.

convert: update source shamap when using filemap, just as when not using filemap The reverse mapping was introduced in 2147a734dcf9 to make roundtrip conversions possible ... but it did not work when using filemap. Roundtrips with filemaps will of course only work flawlessly if inverse mappings are used. Especially, if a lossy convert mapping is used in one direction, then only linear lines of development can be converted in the other direction. With this constraint convert will do the right thing by assuming that excluded files haven't been changed.) A test case with general coverage of hg-hg roundtrips with filemap is added. (There a cases where adding records of converted revisions to the shamap in the source repository doesn't work - especially when converting the same repo to several other repos and back. It would arguably be better if convert only updated the shamaps in the target repo but read shamaps from both the source and and target repo ... but that is a different story. Making the stuff we have work consistently is step forward no matter what.)

convert: introduce hg.revs to replace hg.startrev and --rev with a revset The existing knobs for controlling which revisions to convert were often insufficient. Revsets is a shiny hammer that provides a better solution. Revsets has been introduced in --rev handling in a lot of other places while being more or less backwards compatible. Doing the same here would be a much more elegant ... but that would unfortunately not work in this case. "--rev 7" used to mean revision 0 to 7 - it would be an unacceptable change if it suddenly just meant revision 7. Instead we introduce a new configuration setting. It will only work for Mercurial repositories so adding a new commandline option for it would not be a nice solution. There is no way to use the fancy deprecation markup for configuration settings so we just remove the documentation of hg.startrev.

convert: refactor head calculation for hg sources

convert: remove unused and incorrect default handling for revmapfile destc is not a string and can thus not be os.path.join'ed. Convert would crash if we ended up there ... but we wouldn't because both the sinks (hg and subversion) sinks implement .revmapfile and "never" throws exceptions.

generaldelta: fix test

shelve: fix dirstate corruption during unshelve (issue4055) If you shelved on top of commit A, then rebased A to @ and unshelved, any file changed in A would appear as modified in hg status despite the contents not having changed. The fix is to use dirstate.setparents() instead of doing it manually. This will be a little slower since it has to iterate through everything in the dirstate instead of only what's in the mergestate, but this will be more correct since the mergestate did not include files which were merged but had no conflict. The tests also had several bad dirstate's hardcoded in them. This change updates the tests appropriately and adds a new test to cover this specific rebase case.

merge with stable

shelve: only save mq state if enabled Test coverage has been added.

changegroup: don't run changegroup hooks if nodes are gone The changegroup hook runs when the repo lock is released, but it's possible that multiple transactions have happened during that single lock and therefore the commits the hook was for may be gone. This is the case in the shelve extension where it adds a commit and strips it in the same lock but different transactions (which results in warning messages during unshelve on hgsubversion repos). A real fix would be to attach the hook to the transaction instead, but that might have unknown consequences. Since we're this close to code-freeze, this fix just prevents the hook from running if the commit disappeared.