hgext/convert/git.py
author Patrick Mezard <pmezard@gmail.com>
Sun, 25 Apr 2010 22:59:50 +0200
branchstable
changeset 10986 610f047326b9
parent 10985 7fab6ae3f688
child 10987 b3af02b1f19f
permissions -rw-r--r--
convert/git: check status when reading the whole output
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# git.py - git support for the convert extension
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#
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#  Copyright 2005-2009 Matt Mackall <mpm@selenic.com> and others
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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import os
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from mercurial import util
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from mercurial.i18n import _
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from common import NoRepo, commit, converter_source, checktool
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class convert_git(converter_source):
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    # Windows does not support GIT_DIR= construct while other systems
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    # cannot remove environment variable. Just assume none have
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    # both issues.
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    if hasattr(os, 'unsetenv'):
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        def gitopen(self, s):
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            prevgitdir = os.environ.get('GIT_DIR')
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            os.environ['GIT_DIR'] = self.path
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            try:
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                return util.popen(s, 'rb')
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            finally:
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                if prevgitdir is None:
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                    del os.environ['GIT_DIR']
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                else:
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                    os.environ['GIT_DIR'] = prevgitdir
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    else:
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        def gitopen(self, s):
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            return util.popen('GIT_DIR=%s %s' % (self.path, s), 'rb')
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    def gitread(self, s):
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        fh = self.gitopen(s)
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        data = fh.read()
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        return data, fh.close()
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    def __init__(self, ui, path, rev=None):
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        super(convert_git, self).__init__(ui, path, rev=rev)
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        if os.path.isdir(path + "/.git"):
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            path += "/.git"
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        if not os.path.exists(path + "/objects"):
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            raise NoRepo(_("%s does not look like a Git repository") % path)
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        checktool('git', 'git')
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        self.path = path
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    def getheads(self):
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        if not self.rev:
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            heads, ret = self.gitread('git rev-parse --branches --remotes')
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            heads = heads.splitlines()
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        else:
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            heads, ret = self.gitread("git rev-parse --verify %s" % self.rev)
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            heads = [heads[:-1]]
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        if ret:
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            raise util.Abort(_('cannot retrieve git heads'))
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        return heads
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    def catfile(self, rev, type):
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        if rev == "0" * 40:
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            raise IOError()
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        data, ret = self.gitread("git cat-file %s %s" % (type, rev))
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        if ret:
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            raise util.Abort(_('cannot read %r object at %s') % (type, rev))
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        return data
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    def getfile(self, name, rev):
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        return self.catfile(rev, "blob")
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    def getmode(self, name, rev):
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        return self.modecache[(name, rev)]
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    def getchanges(self, version):
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        self.modecache = {}
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        fh = self.gitopen("git diff-tree -z --root -m -r %s" % version)
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        changes = []
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        seen = set()
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        entry = None
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        for l in fh.read().split('\x00'):
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            if not entry:
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                if not l.startswith(':'):
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                    continue
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                entry = l
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                continue
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            f = l
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            if f not in seen:
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                seen.add(f)
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                entry = entry.split()
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                h = entry[3]
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                p = (entry[1] == "100755")
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                s = (entry[1] == "120000")
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                self.modecache[(f, h)] = (p and "x") or (s and "l") or ""
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                changes.append((f, h))
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            entry = None
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        return (changes, {})
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    def getcommit(self, version):
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        c = self.catfile(version, "commit") # read the commit hash
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        end = c.find("\n\n")
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        message = c[end + 2:]
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        message = self.recode(message)
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        l = c[:end].splitlines()
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        parents = []
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        author = committer = None
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        for e in l[1:]:
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            n, v = e.split(" ", 1)
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            if n == "author":
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                p = v.split()
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                tm, tz = p[-2:]
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                author = " ".join(p[:-2])
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                if author[0] == "<": author = author[1:-1]
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                author = self.recode(author)
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            if n == "committer":
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                p = v.split()
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                tm, tz = p[-2:]
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                committer = " ".join(p[:-2])
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                if committer[0] == "<": committer = committer[1:-1]
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                committer = self.recode(committer)
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            if n == "parent":
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                parents.append(v)
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        if committer and committer != author:
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            message += "\ncommitter: %s\n" % committer
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        tzs, tzh, tzm = tz[-5:-4] + "1", tz[-4:-2], tz[-2:]
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        tz = -int(tzs) * (int(tzh) * 3600 + int(tzm))
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        date = tm + " " + str(tz)
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        c = commit(parents=parents, date=date, author=author, desc=message,
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                   rev=version)
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        return c
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    def gettags(self):
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        tags = {}
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        fh = self.gitopen('git ls-remote --tags "%s"' % self.path)
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        prefix = 'refs/tags/'
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        for line in fh:
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            line = line.strip()
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            if not line.endswith("^{}"):
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                continue
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            node, tag = line.split(None, 1)
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            if not tag.startswith(prefix):
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                continue
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            tag = tag[len(prefix):-3]
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            tags[tag] = node
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        return tags
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    def getchangedfiles(self, version, i):
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        changes = []
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        if i is None:
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            fh = self.gitopen("git diff-tree --root -m -r %s" % version)
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            for l in fh:
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                if "\t" not in l:
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                    continue
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                m, f = l[:-1].split("\t")
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                changes.append(f)
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            fh.close()
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        else:
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            fh = self.gitopen('git diff-tree --name-only --root -r %s "%s^%s" --'
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                             % (version, version, i + 1))
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            changes = [f.rstrip('\n') for f in fh]
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            fh.close()
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        return changes