mercurial/patch.py
author Vadim Gelfer <vadim.gelfer@gmail.com>
Sat, 12 Aug 2006 12:47:18 -0700
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parent 2862 f3c68e0ca37d
child 2865 2893e51407a4
permissions -rw-r--r--
merge git patch code.
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# patch.py - patch file parsing routines
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#
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# Copyright 2006 Brendan Cully <brendan@kublai.com>
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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 demandload import demandload
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demandload(globals(), "util")
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demandload(globals(), "os re shutil tempfile")
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def readgitpatch(patchname):
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    """extract git-style metadata about patches from <patchname>"""
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    class gitpatch:
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        "op is one of ADD, DELETE, RENAME, MODIFY or COPY"
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        def __init__(self, path):
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            self.path = path
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            self.oldpath = None
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            self.mode = None
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            self.op = 'MODIFY'
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            self.copymod = False
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            self.lineno = 0
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    # Filter patch for git information
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    gitre = re.compile('diff --git a/(.*) b/(.*)')
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    pf = file(patchname)
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    gp = None
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    gitpatches = []
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    # Can have a git patch with only metadata, causing patch to complain
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    dopatch = False
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    lineno = 0
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    for line in pf:
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        lineno += 1
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        if line.startswith('diff --git'):
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            m = gitre.match(line)
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            if m:
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                if gp:
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                    gitpatches.append(gp)
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                src, dst = m.group(1,2)
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                gp = gitpatch(dst)
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                gp.lineno = lineno
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        elif gp:
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            if line.startswith('--- '):
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                if gp.op in ('COPY', 'RENAME'):
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                    gp.copymod = True
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                    dopatch = 'filter'
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                gitpatches.append(gp)
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                gp = None
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                if not dopatch:
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                    dopatch = True
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                continue
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            if line.startswith('rename from '):
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                gp.op = 'RENAME'
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                gp.oldpath = line[12:].rstrip()
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            elif line.startswith('rename to '):
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                gp.path = line[10:].rstrip()
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            elif line.startswith('copy from '):
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                gp.op = 'COPY'
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                gp.oldpath = line[10:].rstrip()
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            elif line.startswith('copy to '):
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                gp.path = line[8:].rstrip()
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            elif line.startswith('deleted file'):
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                gp.op = 'DELETE'
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            elif line.startswith('new file mode '):
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                gp.op = 'ADD'
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                gp.mode = int(line.rstrip()[-3:], 8)
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            elif line.startswith('new mode '):
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                gp.mode = int(line.rstrip()[-3:], 8)
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    if gp:
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        gitpatches.append(gp)
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    if not gitpatches:
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        dopatch = True
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    return (dopatch, gitpatches)
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def dogitpatch(patchname, gitpatches):
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    """Preprocess git patch so that vanilla patch can handle it"""
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    pf = file(patchname)
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    pfline = 1
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    fd, patchname = tempfile.mkstemp(prefix='hg-patch-')
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    tmpfp = os.fdopen(fd, 'w')
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    try:
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        for i in range(len(gitpatches)):
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            p = gitpatches[i]
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            if not p.copymod:
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                continue
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            if os.path.exists(p.path):
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                raise util.Abort(_("cannot create %s: destination already exists") %
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                            p.path)
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            (src, dst) = [os.path.join(os.getcwd(), n)
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                          for n in (p.oldpath, p.path)]
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            targetdir = os.path.dirname(dst)
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            if not os.path.isdir(targetdir):
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                os.makedirs(targetdir)
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            try:
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                shutil.copyfile(src, dst)
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                shutil.copymode(src, dst)
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            except shutil.Error, inst:
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                raise util.Abort(str(inst))
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            # rewrite patch hunk
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            while pfline < p.lineno:
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                tmpfp.write(pf.readline())
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                pfline += 1
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            tmpfp.write('diff --git a/%s b/%s\n' % (p.path, p.path))
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            line = pf.readline()
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            pfline += 1
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            while not line.startswith('--- a/'):
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                tmpfp.write(line)
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                line = pf.readline()
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                pfline += 1
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            tmpfp.write('--- a/%s\n' % p.path)
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        line = pf.readline()
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        while line:
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            tmpfp.write(line)
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            line = pf.readline()
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    except:
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        tmpfp.close()
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        os.unlink(patchname)
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        raise
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    tmpfp.close()
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    return patchname
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def patch(strip, patchname, ui, cwd=None):
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    """apply the patch <patchname> to the working directory.
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    a list of patched files is returned"""
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    (dopatch, gitpatches) = readgitpatch(patchname)
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    files = {}
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    if dopatch:
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        if dopatch == 'filter':
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            patchname = dogitpatch(patchname, gitpatches)
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        patcher = util.find_in_path('gpatch', os.environ.get('PATH', ''), 'patch')
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        args = []
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        if cwd:
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            args.append('-d %s' % util.shellquote(cwd))
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        fp = os.popen('%s %s -p%d < %s' % (patcher, ' '.join(args), strip,
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                                           util.shellquote(patchname)))
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        if dopatch == 'filter':
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            False and os.unlink(patchname)
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        for line in fp:
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            line = line.rstrip()
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            ui.status("%s\n" % line)
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            if line.startswith('patching file '):
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                pf = util.parse_patch_output(line)
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                files.setdefault(pf, (None, None))
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        code = fp.close()
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        if code:
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            raise util.Abort(_("patch command failed: %s") % explain_exit(code)[0])
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    for gp in gitpatches:
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        files[gp.path] = (gp.op, gp)
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    return files