opener: always reset flags on 'w'rite only the patcher needs to preserve flags on write

subrepo: silence git output when ui.quiet is set

subrepo: show git command with --debug Also removing the clutter of --no-pager, since none of these commands use the pager.

subrepo: speed up git push logic In many common cases where the subrepo is up to date with the remote repo, hg push will only need to run one git-branch command to see that nothing needs to be pushed.

subrepo: use subprocess.Popen without the shell As well as simplifying the code, this makes subprocess calls about 25% faster. Tested on a couple linux boxes. python -mtimeit -s'import subprocess' 'subprocess.Popen( "git version", shell=True, stdout=subprocess.PIPE).wait()' python -mtimeit -s'import subprocess' 'subprocess.Popen( ["git","version"], stdout=subprocess.PIPE).wait()'

subrepo: treat git error code 1 as success At least status, commit, merge-base, and diff all return 1 when not failing.

subrepo: gitsubrepo should inherit from abstractsubrepo

subrepo: initialize subrepo relative default paths relative to their root

merge with stable

bookmarks: create undo.bookmarks using repo.opener instead of util.copyfile This more closely matches how the other undo files are created, and we don't care about settings permissions or times on the file, which can fail if the user running hg doesn't own the file.