hgext/hbisect.py
author Vadim Gelfer <vadim.gelfer@gmail.com>
Fri, 21 Apr 2006 15:27:57 -0700
changeset 2112 2b03c6733efa
parent 1862 b41d71961aed
child 2305 e7de4dd43472
permissions -rw-r--r--
add "archive" command, like "cvs export" only better. most code in mercurial/archival.py module, for sharing with hgweb.
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# bisect extension for mercurial
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#
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# Copyright 2005, 2006 Benoit Boissinot <benoit.boissinot@ens-lyon.org>
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# Inspired by git bisect, extension skeleton taken from mq.py.
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#
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# This software may be used and distributed according to the terms
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# of the GNU General Public License, incorporated herein by reference.
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from mercurial.demandload import demandload
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demandload(globals(), "os sys sets mercurial:hg,util")
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versionstr = "0.0.3"
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def lookup_rev(ui, repo, rev=None):
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    """returns rev or the checked-out revision if rev is None"""
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    if not rev is None:
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        return repo.lookup(rev)
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    parents = [p for p in repo.dirstate.parents() if p != hg.nullid]
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    if len(parents) != 1:
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        ui.warn("unexpected number of parents\n")
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        ui.warn("please commit or revert\n")
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        sys.exit(1)
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    return parents.pop()
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def check_clean(ui, repo):
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        modified, added, removed, deleted, unknown = repo.changes()
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        if modified or added or removed:
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            ui.warn("Repository is not clean, please commit or revert\n")
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            sys.exit(1)
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class bisect(object):
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    """dichotomic search in the DAG of changesets"""
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    def __init__(self, ui, repo):
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        self.repo = repo
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        self.path = repo.join("bisect")
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        self.opener = util.opener(self.path)
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        self.ui = ui
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        self.goodrevs = []
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        self.badrev = None
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        self.good_dirty = 0
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        self.bad_dirty = 0
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        self.good_path = "good"
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        self.bad_path = "bad"
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        if os.path.exists(os.path.join(self.path, self.good_path)):
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            self.goodrevs = self.opener(self.good_path).read().splitlines()
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            self.goodrevs = [hg.bin(x) for x in self.goodrevs]
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        if os.path.exists(os.path.join(self.path, self.bad_path)):
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            r = self.opener(self.bad_path).read().splitlines()
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            if r:
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                self.badrev = hg.bin(r.pop(0))
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    def __del__(self):
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        if not os.path.isdir(self.path):
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            return
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        f = self.opener(self.good_path, "w")
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        f.write("\n".join([hg.hex(r) for r in  self.goodrevs]))
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        if len(self.goodrevs) > 0:
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            f.write("\n")
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        f = self.opener(self.bad_path, "w")
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        if self.badrev:
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            f.write(hg.hex(self.badrev) + "\n")
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    def init(self):
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        """start a new bisection"""
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        if os.path.isdir(self.path):
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            self.ui.warn("bisect directory already exists\n")
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            return 1
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        os.mkdir(self.path)
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        check_clean(self.ui, self.repo)
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        return 0
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    def reset(self):
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        """finish a bisection"""
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        if os.path.isdir(self.path):
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            sl = [os.path.join(self.path, p)
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                  for p in [self.bad_path, self.good_path]]
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            for s in sl:
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                if os.path.exists(s):
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                    os.unlink(s)
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            os.rmdir(self.path)
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        # Not sure about this
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        #self.ui.write("Going back to tip\n")
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        #self.repo.update(self.repo.changelog.tip())
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        return 1
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    def num_ancestors(self, head=None, stop=None):
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        """
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        returns a dict with the mapping:
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        node -> number of ancestors (self included)
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        for all nodes who are ancestor of head and
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        not in stop.
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        """
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        if head is None:
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            head = self.badrev
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        return self.__ancestors_and_nb_ancestors(head, stop)[1]
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    def ancestors(self, head=None, stop=None):
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        """
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        returns the set of the ancestors of head (self included)
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        who are not in stop.
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        """
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        if head is None:
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            head = self.badrev
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        return self.__ancestors_and_nb_ancestors(head, stop)[0]
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    def __ancestors_and_nb_ancestors(self, head, stop=None):
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        """
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        if stop is None then ancestors of goodrevs are used as
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        lower limit.
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        returns (anc, n_child) where anc is the set of the ancestors of head
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        and n_child is a dictionary with the following mapping:
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        node -> number of ancestors (self included)
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        """
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        cl = self.repo.changelog
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        if not stop:
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            stop = sets.Set([])
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            for i in xrange(len(self.goodrevs)-1, -1, -1):
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                g = self.goodrevs[i]
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                if g in stop:
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                    continue
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                stop.update(cl.reachable(g))
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        def num_children(a):
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   125
            """
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            returns a dictionnary with the following mapping
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            node -> [number of children, empty set]
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            """
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            d = {a: [0, sets.Set([])]}
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            for i in xrange(cl.rev(a)+1):
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                n = cl.node(i)
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                if not d.has_key(n):
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                    d[n] = [0, sets.Set([])]
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   134
                parents = [p for p in cl.parents(n) if p != hg.nullid]
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                for p in parents:
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   136
                    d[p][0] += 1
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   137
            return d
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        if head in stop:
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            self.ui.warn("Unconsistent state, %s is good and bad\n"
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                          % hg.hex(head))
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            sys.exit(1)
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   143
        n_child = num_children(head)
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        for i in xrange(cl.rev(head)+1):
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            n = cl.node(i)
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   146
            parents = [p for p in cl.parents(n) if p != hg.nullid]
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            for p in parents:
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                n_child[p][0] -= 1
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                if not n in stop:
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                    n_child[n][1].union_update(n_child[p][1])
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                if n_child[p][0] == 0:
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                    n_child[p] = len(n_child[p][1])
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            if not n in stop:
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                n_child[n][1].add(n)
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   155
            if n_child[n][0] == 0:
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                if n == head:
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                    anc = n_child[n][1]
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   158
                n_child[n] = len(n_child[n][1])
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   159
        return anc, n_child
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   160
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    def next(self):
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        if not self.badrev:
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   163
            self.ui.warn("You should give at least one bad\n")
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            sys.exit(1)
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   165
        if not self.goodrevs:
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   166
            self.ui.warn("No good revision given\n")
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   167
            self.ui.warn("Assuming the first revision is good\n")
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   168
        ancestors, num_ancestors = self.__ancestors_and_nb_ancestors(
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   169
                                    self.badrev)
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   170
        tot = len(ancestors)
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   171
        if tot == 1:
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   172
            if ancestors.pop() != self.badrev:
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   173
                self.ui.warn("Could not find the first bad revision\n")
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                sys.exit(1)
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   175
            self.ui.write(
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   176
                "The first bad revision is : %s\n" % hg.hex(self.badrev))
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   177
            sys.exit(0)
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   178
        self.ui.write("%d revisions left\n" % tot)
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   179
        best_rev = None
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   180
        best_len = -1
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   181
        for n in ancestors:
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   182
            l = num_ancestors[n]
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   183
            l = min(l, tot - l)
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   184
            if l > best_len:
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   185
                best_len = l
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   186
                best_rev = n
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   187
        return best_rev
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   188
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   189
    def autonext(self):
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   190
        """find and update to the next revision to test"""
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diff changeset
   191
        check_clean(self.ui, self.repo)
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diff changeset
   192
        rev = self.next()
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diff changeset
   193
        self.ui.write("Now testing %s\n" % hg.hex(rev))
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   194
        return self.repo.update(rev, force=True)
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   195
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   196
    def good(self, rev):
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diff changeset
   197
        self.goodrevs.append(rev)
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diff changeset
   198
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diff changeset
   199
    def autogood(self, rev=None):
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   200
        """mark revision as good and update to the next revision to test"""
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diff changeset
   201
        check_clean(self.ui, self.repo)
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diff changeset
   202
        rev = lookup_rev(self.ui, self.repo, rev)
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diff changeset
   203
        self.good(rev)
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   204
        if self.badrev:
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diff changeset
   205
            self.autonext()
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diff changeset
   206
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   207
    def bad(self, rev):
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   208
        self.badrev = rev
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   209
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   210
    def autobad(self, rev=None):
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diff changeset
   211
        """mark revision as bad and update to the next revision to test"""
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parents:
diff changeset
   212
        check_clean(self.ui, self.repo)
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diff changeset
   213
        rev = lookup_rev(self.ui, self.repo, rev)
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diff changeset
   214
        self.bad(rev)
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diff changeset
   215
        if self.goodrevs:
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parents:
diff changeset
   216
            self.autonext()
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diff changeset
   217
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   218
# should we put it in the class ?
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diff changeset
   219
def test(ui, repo, rev):
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diff changeset
   220
    """test the bisection code"""
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parents:
diff changeset
   221
    b = bisect(ui, repo)
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parents:
diff changeset
   222
    rev = repo.lookup(rev)
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parents:
diff changeset
   223
    ui.write("testing with rev %s\n" % hg.hex(rev))
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parents:
diff changeset
   224
    anc = b.ancestors()
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diff changeset
   225
    while len(anc) > 1:
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diff changeset
   226
        if not rev in anc:
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diff changeset
   227
            ui.warn("failure while bisecting\n")
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diff changeset
   228
            sys.exit(1)
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diff changeset
   229
        ui.write("it worked :)\n")
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parents:
diff changeset
   230
        new_rev = b.next()
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parents:
diff changeset
   231
        ui.write("choosing if good or bad\n")
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parents:
diff changeset
   232
        if rev in b.ancestors(head=new_rev):
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parents:
diff changeset
   233
            b.bad(new_rev)
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parents:
diff changeset
   234
            ui.write("it is bad\n")
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parents:
diff changeset
   235
        else:
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parents:
diff changeset
   236
            b.good(new_rev)
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parents:
diff changeset
   237
            ui.write("it is good\n")
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parents:
diff changeset
   238
        anc = b.ancestors()
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2428e6d66f06 bisect: fix for recent changes disallowing "false" merges
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parents: 1619
diff changeset
   239
        repo.update(new_rev, force=True)
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    for v in anc:
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        if v != rev:
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            ui.warn("fail to found cset! :(\n")
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            return 1
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    ui.write("Found bad cset: %s\n" % hg.hex(b.badrev))
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    ui.write("Everything is ok :)\n")
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    return 0
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def bisect_run(ui, repo, cmd=None, *args):
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    """bisect extension: dichotomic search in the DAG of changesets
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for subcommands see "hg bisect help\"
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    """
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    def help_(cmd=None, *args):
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        """show help for a given bisect subcommand or all subcommands"""
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        cmdtable = bisectcmdtable
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        if cmd:
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            doc = cmdtable[cmd][0].__doc__
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            synopsis = cmdtable[cmd][2]
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            ui.write(synopsis + "\n")
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            ui.write("\n" + doc + "\n")
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            return
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        ui.write("list of subcommands for the bisect extension\n\n")
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        cmds = cmdtable.keys()
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        cmds.sort()
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        m = max([len(c) for c in cmds])
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        for cmd in cmds:
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            doc = cmdtable[cmd][0].__doc__.splitlines(0)[0].rstrip()
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            ui.write(" %-*s   %s\n" % (m, cmd, doc))
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    b = bisect(ui, repo)
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    bisectcmdtable = {
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        "init": (b.init, 0, "hg bisect init"),
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        "bad": (b.autobad, 1, "hg bisect bad [<rev>]"),
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        "good": (b.autogood, 1, "hg bisect good [<rev>]"),
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        "next": (b.autonext, 0, "hg bisect next"),
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        "reset": (b.reset, 0, "hg bisect reset"),
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        "help": (help_, 1, "hg bisect help [<subcommand>]"),
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    }
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    if not bisectcmdtable.has_key(cmd):
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        ui.warn("bisect: Unknown sub-command\n")
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        return help_()
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    if len(args) > bisectcmdtable[cmd][1]:
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        ui.warn("bisect: Too many arguments\n")
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        return help_()
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    return bisectcmdtable[cmd][0](*args)
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cmdtable = {
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    "bisect": (bisect_run, [], "hg bisect [help|init|reset|next|good|bad]"),
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    #"bisect-test": (test, [], "hg bisect-test rev"),
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}