Mercurial > hg
view tests/test-commit-multiple.t @ 18986:2f7186400a07
ancestor: a new algorithm that is faster for nodes near tip
Instead of walking all the way to the root of the DAG, we generate
a set of candidate GCA revs, then figure out which ones will win
the race to the root (usually without needing to traverse all the
way to the root).
In the common case of nodes that are close to each other in both
revision number and topology, this is usually a big win: it makes
"hg --time debugancestors" up to 9 times faster than the more general
ancestor function when measured on heads of the linux-2.6 hg repo.
Victory is not assured, however. The older function can still win
by a large margin if one node is much closer to the root than the
other, or by a much smaller amount if one is an ancestor of the
other.
For now, we've also got a small paranoid harness function that calls
both ancestor functions on every input and ensures that they give
equivalent answers.
Even without the checker function, the old ancestor function needs
to stay alive for the time being, as its generality is used by
context.filectx.merge.
author | Bryan O'Sullivan <bryano@fb.com> |
---|---|
date | Tue, 16 Apr 2013 10:08:18 -0700 |
parents | f2719b387380 |
children | aa9385f983fa |
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# reproduce issue2264, issue2516 create test repo $ cat <<EOF >> $HGRCPATH > [extensions] > transplant = > graphlog = > EOF $ hg init repo $ cd repo $ template="{rev} {desc|firstline} [{branch}]\n" # we need to start out with two changesets on the default branch # in order to avoid the cute little optimization where transplant # pulls rather than transplants add initial changesets $ echo feature1 > file1 $ hg ci -Am"feature 1" adding file1 $ echo feature2 >> file2 $ hg ci -Am"feature 2" adding file2 # The changes to 'bugfix' are enough to show the bug: in fact, with only # those changes, it's a very noisy crash ("RuntimeError: nothing # committed after transplant"). But if we modify a second file in the # transplanted changesets, the bug is much more subtle: transplant # silently drops the second change to 'bugfix' on the floor, and we only # see it when we run 'hg status' after transplanting. Subtle data loss # bugs are worse than crashes, so reproduce the subtle case here. commit bug fixes on bug fix branch $ hg branch fixes marked working directory as branch fixes (branches are permanent and global, did you want a bookmark?) $ echo fix1 > bugfix $ echo fix1 >> file1 $ hg ci -Am"fix 1" adding bugfix $ echo fix2 > bugfix $ echo fix2 >> file1 $ hg ci -Am"fix 2" $ hg glog --template="$template" @ 3 fix 2 [fixes] | o 2 fix 1 [fixes] | o 1 feature 2 [default] | o 0 feature 1 [default] transplant bug fixes onto release branch $ hg update 0 1 files updated, 0 files merged, 2 files removed, 0 files unresolved $ hg branch release marked working directory as branch release (branches are permanent and global, did you want a bookmark?) $ hg transplant 2 3 applying [0-9a-f]{12} (re) [0-9a-f]{12} transplanted to [0-9a-f]{12} (re) applying [0-9a-f]{12} (re) [0-9a-f]{12} transplanted to [0-9a-f]{12} (re) $ hg glog --template="$template" @ 5 fix 2 [release] | o 4 fix 1 [release] | | o 3 fix 2 [fixes] | | | o 2 fix 1 [fixes] | | | o 1 feature 2 [default] |/ o 0 feature 1 [default] $ hg status $ hg status --rev 0:4 M file1 A bugfix $ hg status --rev 4:5 M bugfix M file1 now test that we fixed the bug for all scripts/extensions $ cat > $TESTTMP/committwice.py <<__EOF__ > from mercurial import ui, hg, match, node > from time import sleep > > def replacebyte(fn, b): > f = open(fn, "rb+") > f.seek(0, 0) > f.write(b) > f.close() > > def printfiles(repo, rev): > print "revision %s files: %s" % (rev, repo[rev].files()) > > repo = hg.repository(ui.ui(), '.') > assert len(repo) == 6, \ > "initial: len(repo): %d, expected: 6" % len(repo) > > replacebyte("bugfix", "u") > sleep(2) > try: > print "PRE: len(repo): %d" % len(repo) > wlock = repo.wlock() > lock = repo.lock() > replacebyte("file1", "x") > repo.commit(text="x", user="test", date=(0, 0)) > replacebyte("file1", "y") > repo.commit(text="y", user="test", date=(0, 0)) > print "POST: len(repo): %d" % len(repo) > finally: > lock.release() > wlock.release() > printfiles(repo, 6) > printfiles(repo, 7) > __EOF__ $ $PYTHON $TESTTMP/committwice.py PRE: len(repo): 6 POST: len(repo): 8 revision 6 files: ['bugfix', 'file1'] revision 7 files: ['file1'] Do a size-preserving modification outside of that process $ echo abcd > bugfix $ hg status M bugfix $ hg log --template "{rev} {desc} {files}\n" -r5: 5 fix 2 bugfix file1 6 x bugfix file1 7 y file1 $ cd ..