py3: fix fix doctests to be bytes-safe

server: add an error feedback mechanism for when the daemon fails to launch There's a recurring problem on Windows where `hg serve -d` will randomly fail to spawn a detached process. The reason for the failure is completely hidden, and it takes hours to get a single failure on my laptop. All this does is redirect stdout/stderr of the child to a file until the lock file is freed, and then the parent dumps it out if it fails to spawn. I chose to put the output into the lock file because that is always cleaned up. There's no way to report errors after that anyway. On Windows, killdaemons.py is roughly `kill -9`, so this ensures that junk won't pile up. This may end up being a case of EADDRINUSE. At least that's what I saw spit out a few times (among other odd errors and missing output on Windows). But I also managed to get the same thing on Fedora 26 by running test-hgwebdir.t with --loop -j10 for several hours. Running `netstat` immediately after killing that run printed a wall of sockets in the TIME_WAIT state, which were gone a couple seconds later. I couldn't match up ports that failed, because --loop doesn't print out the message about the port that was used. So maybe the fix is to rotate the use of HGPORT[12] in the tests. But, let's collect some more data first.

tests: conditionalize test-stream-bundle-v2 for Windows

templatefuncs: add mailmap template function This commit adds a template function to support the .mailmap file in Mercurial repositories. The .mailmap file comes from git, and can be used to map new emails and names for old commits. The general use case is that someone may change their name or author commits under different emails and aliases, which would make these commits appear as though they came from different persons. The file allows you to specify the correct name that should be used in place of the author field specified in the commit. The mailmap file has 4 possible formats used to map old "commit" names to new "proper" names: 1. <proper@email.com> <commit@email.com> 2. Proper Name <commit@email.com> 3. Proper Name <proper@email.com> <commit@email.com> 4. Proper Name <proper@email.com> Commit Name <commit@email.com> Essentially there is a commit email present in each mailmap entry, that maps to either an updated name, email, or both. The final possible format allows commits authored by a person who used both an old name and an old email to map to a new name and email. To parse the file, we split by spaces and build a name out of every element that does not start with "<". Once we find an element that does start with "<" we concatenate all the name elements that preceded and add that as a parsed name. We then add the email as the first parsed email. We repeat the process until the end of the line, or a comment is found. We will be left with all parsed names in a list, and all parsed emails in a list, with the 0 index being the proper values and the 1 index being the commit values (if they were specified in the entry). The commit values are added as the keys to a dict, and with the proper fields as the values. The mapname function takes the mapping object and the commit author field and attempts to look for a corresponding entry. To do so we try (commit name, commit email) first, and if no results are returned then (None, commit email) is also looked up. This is due to format 4 from above, where someone may have a mailmap entry with both name and email, and if they don't it is possible they have an entry that uses only the commit email. Differential Revision: https://phab.mercurial-scm.org/D2904

extdiff: document that it copies modified files back to working directory Differential Revision: https://phab.mercurial-scm.org/D2976

zope: force module import by importing symbols Previously, we tried to import a module and handle the ImportError. Our lazy module importer doesn't verify the module exists and returns a dummy object representing the module. Only once we attempt to load a symbol in the module does the ImportError get raises. This means that simple imports inside `try..except ImportError` don't detect missing modules. This commit changes imports in zope.interface to access symbols, thus forcing module load and triggering ImportError. This fixes zope.interface for pure builds. Differential Revision: https://phab.mercurial-scm.org/D2980

fix: remove unused imports Differential Revision: https://phab.mercurial-scm.org/D2977

infinitepush: introduce server option to route every push to bundlestore This patch introduces a new config option for server `infinitepush.pushtobundlestore` which if sets to True, the server will route each incoming push to the bundlestore and store all the parts i.e. changegroups, phases, obsmarkers in the bundlestore and won't be applied to the revlog. This config option does not need any client side wrapping and does not need any custom bundle2 part or stream level parameter to decide where the push should go. This is very useful for Mozilla CI use case where they have a central server that recieves pushes to trigger code-reviews, trigger a test run of CI, run static analysis etc. The server using the new config option can stash standalone bundles to the bundlestore and server can get access to individual revisions on demand. A new test file which has related tests are added for the config option. Differential Revision: https://phab.mercurial-scm.org/D2958

infinitepush: don't wrap bundle2.processparts while calling `hg unbundle` This patch adds dirty logic to check whether we are processing `hg unbundle` instead of an `hg incoming` to prevent the wrapping of bundle2.processparts function. Differential Revision: https://phab.mercurial-scm.org/D2957

inifnitepush: use utils.{stringutil|procutil}.* instead of util.* Recently in core, util.py is splitted into various modules in mercurial/utils/. Differential Revision: https://phab.mercurial-scm.org/D2956

infinitepush: delete the non-forward-move flag for hg push Differential Revision: https://phab.mercurial-scm.org/D2955

infinitepush: drop the wrapping of update command on client side The extension wraps update command to client side to add functionality to pull and checkout to a revision if it does not present locally. There is a twist to that, only changesets which can resolve to remotenames can be pulled using this. Differential Revision: https://phab.mercurial-scm.org/D2954

infinitepush: delete infinitepushcommands.py and related tests This patch drops infinitepushcommands.py and the tests which were related to the command `debugfillinfinitepushmetadata` introduced in the commit. The patch also drops a config option which was related to debuginfinitepushmetadata command. Differential Revision: https://phab.mercurial-scm.org/D2953

infinitepush: delete infinitepush.fillmetadatabranchpattern config option This patch deletes the config option infinitepush.fillmetadatabranchpattern which if set to true sets a background process which will save metadata in infinitepush index. This series is meant to have a state where we can use it for CI purposes. Differential Revision: https://phab.mercurial-scm.org/D2952

infinitepush: drop the `--to` flag to push and use `-B` instead The extension added a `--to` flag to specify the bookmark to which revs should be pushed. This patch deletes that flag and instead uses the `-B` flag. After this patch, bookmark passed as `-B` is parsed and if it matches the infinitepush bookmark pattern, we consider that push as infinitepush. This is still not the best of what we can do. Later patches in the series will drop the use of `-B` flag and will instead handle things at bookmark bundle2 part. Plugging these logic to bookmark bundle2 part will also get rid of the scratchbranchparttype bundle2 part. Differential Revision: https://phab.mercurial-scm.org/D2108

infinitepush: drop the `--create` flag to push command The extension added a `--create` flag for creating a new bookmark on the bundlestore. This patch changes the bahviour to create a bookmark if it does not exists and removes the requirement of the `--create` and then drop the logic around the `--create` flag. Tests are changed to drop the usage of `--create` flag. Differential Revision: https://phab.mercurial-scm.org/D2107

infinitepush: drop logic related to treemanifest extension treemanifest is another facebook's extension which is not in core. Let's drop the logic related to infinitepush extension which is now ported to core. Differential Revision: https://phab.mercurial-scm.org/D2106

infinitepush: drop hack related to --to, --create flags of remotenames-ext The remotenames extension has --to, --create. --allow-anon flags which won't be ported to core. This patch drops the hack which fixes the interaction with remotenames-ext during push. In upcoming patches, --to and --create extensions will be removed from infinitepush also. Differential Revision: https://phab.mercurial-scm.org/D2105

infinitepush: drop error handling while pushing to svn server This is something which is internal to Facebook and we don't want in core. Differential Revision: https://phab.mercurial-scm.org/D2104

infinitepush: drop `--list-remote`, `--remote-path` flags to bookmark cmd The extension adds these two flags to list remote bookmarks using the `hg bookmark` command. These are not required in core currently and needs some discussion before getting them in, so let's drop them for now. This makes us deleting the wrapping of `hg bookmark` command on client side. The end goal here is to have minimal or no wrapping at client side. Differential Revision: https://phab.mercurial-scm.org/D2103

infinitepush: drop the scratchbookmarksparttype bundle2 part The scratchbookmarksparttype bundle2 part was used in backupcommands.py which we deleted in an earlier changeset. We don't need this part anymore. Moreover we now have bookmarks bundle2 part in core which we can use. This patch also drops the related encoding and decoding functions. Differential Revision: https://phab.mercurial-scm.org/D2102

infinitepush: remove wrapping around bundle2._addpartsfromopts() This wrapping around bundle2._addpartsfromopts() was added by me while hacking on an alternate way to mark a push as infinitepush or not. However the wrapping is wrong as the push command does not go through the code path which was wrapped on the client side. Differential Revision: https://phab.mercurial-scm.org/D2101

infinitepush: delete the bundle2 part ordering related to pushrebase pushrebase is another Facebook extension which does not live in core yet. So let's remove the logic which make sures infinitepush part is moved before the pushrebase one. Differential Revision: https://phab.mercurial-scm.org/D2100

infinitepush: delete the hack to load the extension after remotenames The remotenames extension which circumvents the default push implementation lives outside the core, so let's delete logic related to loading of extension on the basis of remotenames ext. Differential Revision: https://phab.mercurial-scm.org/D2099