view mercurial/dirstate.py @ 1721:801756d0ca84

add pretxncommit hook.

hook allows check of changeset after create, but before transaction
is committed.  hook failure rolls transaction back.

makes place for local policies like commit message must contain bug id
or reviewer signoff.

change also adds parent changeset ids to commit hook environment,
because is cheap and useful.

"""
dirstate.py - working directory tracking for mercurial

Copyright 2005 Matt Mackall <[e-mail]>

This software may be used and distributed according to the terms
of the GNU General Public License, incorporated herein by reference.
"""

import struct, os
from node import *
from i18n import gettext as _
from demandload import *
demandload(globals(), "time bisect stat util re errno")

class dirstate(object):
    def __init__(self, opener, ui, root):
        self.opener = opener
        self.root = root
        self.dirty = 0
        self.ui = ui
        self.map = None
        self.pl = None
        self.copies = {}
        self.ignorefunc = None
        self.blockignore = False

    def wjoin(self, f):
        return os.path.join(self.root, f)

    def getcwd(self):
        cwd = os.getcwd()
        if cwd == self.root: return ''
        return cwd[len(self.root) + 1:]

    def hgignore(self):
        '''return the contents of .hgignore as a list of patterns.

        trailing white space is dropped.
        the escape character is backslash.
        comments start with #.
        empty lines are skipped.

        lines can be of the following formats:

        syntax: regexp # defaults following lines to non-rooted regexps
        syntax: glob   # defaults following lines to non-rooted globs
        re:pattern     # non-rooted regular expression
        glob:pattern   # non-rooted glob
        pattern        # pattern of the current default type'''
        syntaxes = {'re': 'relre:', 'regexp': 'relre:', 'glob': 'relglob:'}
        def parselines(fp):
            for line in fp:
                escape = False
                for i in xrange(len(line)):
                    if escape: escape = False
                    elif line[i] == '\\': escape = True
                    elif line[i] == '#': break
                line = line[:i].rstrip()
                if line: yield line
        pats = []
        try:
            fp = open(self.wjoin('.hgignore'))
            syntax = 'relre:'
            for line in parselines(fp):
                if line.startswith('syntax:'):
                    s = line[7:].strip()
                    try:
                        syntax = syntaxes[s]
                    except KeyError:
                        self.ui.warn(_(".hgignore: ignoring invalid "
                                       "syntax '%s'\n") % s)
                    continue
                pat = syntax + line
                for s in syntaxes.values():
                    if line.startswith(s):
                        pat = line
                        break
                pats.append(pat)
        except IOError: pass
        return pats

    def ignore(self, fn):
        '''default match function used by dirstate and localrepository.
        this honours the .hgignore file, and nothing more.'''
        if self.blockignore:
            return False
        if not self.ignorefunc:
            ignore = self.hgignore()
            if ignore:
                files, self.ignorefunc, anypats = util.matcher(self.root,
                                                               inc=ignore,
                                                               src='.hgignore')
            else:
                self.ignorefunc = util.never
        return self.ignorefunc(fn)

    def __del__(self):
        if self.dirty:
            self.write()

    def __getitem__(self, key):
        try:
            return self.map[key]
        except TypeError:
            self.lazyread()
            return self[key]

    def __contains__(self, key):
        self.lazyread()
        return key in self.map

    def parents(self):
        self.lazyread()
        return self.pl

    def markdirty(self):
        if not self.dirty:
            self.dirty = 1

    def setparents(self, p1, p2=nullid):
        self.lazyread()
        self.markdirty()
        self.pl = p1, p2

    def state(self, key):
        try:
            return self[key][0]
        except KeyError:
            return "?"

    def lazyread(self):
        if self.map is None:
            self.read()

    def read(self):
        self.map = {}
        self.pl = [nullid, nullid]
        try:
            st = self.opener("dirstate").read()
            if not st: return
        except: return

        self.pl = [st[:20], st[20: 40]]

        pos = 40
        while pos < len(st):
            e = struct.unpack(">cllll", st[pos:pos+17])
            l = e[4]
            pos += 17
            f = st[pos:pos + l]
            if '\0' in f:
                f, c = f.split('\0')
                self.copies[f] = c
            self.map[f] = e[:4]
            pos += l

    def copy(self, source, dest):
        self.lazyread()
        self.markdirty()
        self.copies[dest] = source

    def copied(self, file):
        return self.copies.get(file, None)

    def update(self, files, state, **kw):
        ''' current states:
        n  normal
        m  needs merging
        r  marked for removal
        a  marked for addition'''

        if not files: return
        self.lazyread()
        self.markdirty()
        for f in files:
            if state == "r":
                self.map[f] = ('r', 0, 0, 0)
            else:
                s = os.lstat(self.wjoin(f))
                st_size = kw.get('st_size', s.st_size)
                st_mtime = kw.get('st_mtime', s.st_mtime)
                self.map[f] = (state, s.st_mode, st_size, st_mtime)
            if self.copies.has_key(f):
                del self.copies[f]

    def forget(self, files):
        if not files: return
        self.lazyread()
        self.markdirty()
        for f in files:
            try:
                del self.map[f]
            except KeyError:
                self.ui.warn(_("not in dirstate: %s!\n") % f)
                pass

    def clear(self):
        self.map = {}
        self.markdirty()

    def write(self):
        st = self.opener("dirstate", "w", atomic=True)
        st.write("".join(self.pl))
        for f, e in self.map.items():
            c = self.copied(f)
            if c:
                f = f + "\0" + c
            e = struct.pack(">cllll", e[0], e[1], e[2], e[3], len(f))
            st.write(e + f)
        self.dirty = 0

    def filterfiles(self, files):
        ret = {}
        unknown = []

        for x in files:
            if x == '.':
                return self.map.copy()
            if x not in self.map:
                unknown.append(x)
            else:
                ret[x] = self.map[x]

        if not unknown:
            return ret

        b = self.map.keys()
        b.sort()
        blen = len(b)

        for x in unknown:
            bs = bisect.bisect(b, x)
            if bs != 0 and  b[bs-1] == x:
                ret[x] = self.map[x]
                continue
            while bs < blen:
                s = b[bs]
                if len(s) > len(x) and s.startswith(x) and s[len(x)] == '/':
                    ret[s] = self.map[s]
                else:
                    break
                bs += 1
        return ret

    def supported_type(self, f, st, verbose=False):
        if stat.S_ISREG(st.st_mode):
            return True
        if verbose:
            kind = 'unknown'
            if stat.S_ISCHR(st.st_mode): kind = _('character device')
            elif stat.S_ISBLK(st.st_mode): kind = _('block device')
            elif stat.S_ISFIFO(st.st_mode): kind = _('fifo')
            elif stat.S_ISLNK(st.st_mode): kind = _('symbolic link')
            elif stat.S_ISSOCK(st.st_mode): kind = _('socket')
            elif stat.S_ISDIR(st.st_mode): kind = _('directory')
            self.ui.warn(_('%s: unsupported file type (type is %s)\n') % (
                util.pathto(self.getcwd(), f),
                kind))
        return False

    def statwalk(self, files=None, match=util.always, dc=None):
        self.lazyread()

        # walk all files by default
        if not files:
            files = [self.root]
            if not dc:
                dc = self.map.copy()
        elif not dc:
            dc = self.filterfiles(files)

        def statmatch(file, stat):
            file = util.pconvert(file)
            if file not in dc and self.ignore(file):
                return False
            return match(file)

        return self.walkhelper(files=files, statmatch=statmatch, dc=dc)

    def walk(self, files=None, match=util.always, dc=None):
        # filter out the stat
        for src, f, st in self.statwalk(files, match, dc):
            yield src, f

    # walk recursively through the directory tree, finding all files
    # matched by the statmatch function
    #
    # results are yielded in a tuple (src, filename, st), where src
    # is one of:
    # 'f' the file was found in the directory tree
    # 'm' the file was only in the dirstate and not in the tree
    # and st is the stat result if the file was found in the directory.
    #
    # dc is an optional arg for the current dirstate.  dc is not modified
    # directly by this function, but might be modified by your statmatch call.
    #
    def walkhelper(self, files, statmatch, dc):
        # recursion free walker, faster than os.walk.
        def findfiles(s):
            work = [s]
            while work:
                top = work.pop()
                names = os.listdir(top)
                names.sort()
                # nd is the top of the repository dir tree
                nd = util.normpath(top[len(self.root) + 1:])
                if nd == '.': nd = ''
                for f in names:
                    np = util.pconvert(os.path.join(nd, f))
                    if seen(np):
                        continue
                    p = os.path.join(top, f)
                    # don't trip over symlinks
                    st = os.lstat(p)
                    if stat.S_ISDIR(st.st_mode):
                        ds = os.path.join(nd, f +'/')
                        if statmatch(ds, st):
                            work.append(p)
                        if statmatch(np, st) and np in dc:
                            yield 'm', np, st
                    elif statmatch(np, st):
                        if self.supported_type(np, st):
                            yield 'f', np, st
                        elif np in dc:
                            yield 'm', np, st

        known = {'.hg': 1}
        def seen(fn):
            if fn in known: return True
            known[fn] = 1

        # step one, find all files that match our criteria
        files.sort()
        for ff in util.unique(files):
            f = self.wjoin(ff)
            try:
                st = os.lstat(f)
            except OSError, inst:
                nf = util.normpath(ff)
                found = False
                for fn in dc:
                    if nf == fn or (fn.startswith(nf) and fn[len(nf)] == '/'):
                        found = True
                        break
                if not found:
                    self.ui.warn('%s: %s\n' % (
                                 util.pathto(self.getcwd(), ff),
                                 inst.strerror))
                continue
            if stat.S_ISDIR(st.st_mode):
                cmp1 = (lambda x, y: cmp(x[1], y[1]))
                sorted = [ x for x in findfiles(f) ]
                sorted.sort(cmp1)
                for e in sorted:
                    yield e
            else:
                ff = util.normpath(ff)
                if seen(ff):
                    continue
                self.blockignore = True
                if statmatch(ff, st):
                    if self.supported_type(ff, st, verbose=True):
                        yield 'f', ff, st
                    elif ff in dc:
                        yield 'm', ff, st
                self.blockignore = False

        # step two run through anything left in the dc hash and yield
        # if we haven't already seen it
        ks = dc.keys()
        ks.sort()
        for k in ks:
            if not seen(k) and (statmatch(k, None)):
                yield 'm', k, None

    def changes(self, files=None, match=util.always):
        lookup, modified, added, unknown = [], [], [], []
        removed, deleted = [], []

        for src, fn, st in self.statwalk(files, match):
            try:
                type, mode, size, time = self[fn]
            except KeyError:
                unknown.append(fn)
                continue
            if src == 'm':
                nonexistent = True
                if not st:
                    try:
                        f = self.wjoin(fn)
                        st = os.lstat(f)
                    except OSError, inst:
                        if inst.errno != errno.ENOENT:
                            raise
                        st = None
                    # We need to re-check that it is a valid file
                    if st and self.supported_type(fn, st):
                        nonexistent = False
                # XXX: what to do with file no longer present in the fs
                # who are not removed in the dirstate ?
                if nonexistent and type in "nm":
                    deleted.append(fn)
                    continue
            # check the common case first
            if type == 'n':
                if not st:
                    st = os.stat(fn)
                if size != st.st_size or (mode ^ st.st_mode) & 0100:
                    modified.append(fn)
                elif time != st.st_mtime:
                    lookup.append(fn)
            elif type == 'm':
                modified.append(fn)
            elif type == 'a':
                added.append(fn)
            elif type == 'r':
                removed.append(fn)

        return (lookup, modified, added, removed, deleted, unknown)