chiark - git - mdw - stgit/blob - stgit/lib/transaction.py

   1 from stgit import exception, utils
   2 from stgit.out import *
   3 from stgit.lib import git
   4
   5 class TransactionException(exception.StgException):
   6     pass
   7
   8 class TransactionHalted(TransactionException):
   9     pass
  10
  11 def _print_current_patch(old_applied, new_applied):
  12     def now_at(pn):
  13         out.info('Now at patch "%s"' % pn)
  14     if not old_applied and not new_applied:
  15         pass
  16     elif not old_applied:
  17         now_at(new_applied[-1])
  18     elif not new_applied:
  19         out.info('No patch applied')
  20     elif old_applied[-1] == new_applied[-1]:
  21         pass
  22     else:
  23         now_at(new_applied[-1])
  24
  25 class _TransPatchMap(dict):
  26     def __init__(self, stack):
  27         dict.__init__(self)
  28         self.__stack = stack
  29     def __getitem__(self, pn):
  30         try:
  31             return dict.__getitem__(self, pn)
  32         except KeyError:
  33             return self.__stack.patches.get(pn).commit
  34
  35 class StackTransaction(object):
  36     def __init__(self, stack, msg):
  37         self.__stack = stack
  38         self.__msg = msg
  39         self.__patches = _TransPatchMap(stack)
  40         self.__applied = list(self.__stack.patchorder.applied)
  41         self.__unapplied = list(self.__stack.patchorder.unapplied)
  42         self.__error = None
  43         self.__current_tree = self.__stack.head.data.tree
  44         self.__base = self.__stack.base
  45     stack = property(lambda self: self.__stack)
  46     patches = property(lambda self: self.__patches)
  47     def __set_applied(self, val):
  48         self.__applied = list(val)
  49     applied = property(lambda self: self.__applied, __set_applied)
  50     def __set_unapplied(self, val):
  51         self.__unapplied = list(val)
  52     unapplied = property(lambda self: self.__unapplied, __set_unapplied)
  53     def __set_base(self, val):
  54         assert (not self.__applied
  55                 or self.patches[self.applied[0]].data.parent == val)
  56         self.__base = val
  57     base = property(lambda self: self.__base, __set_base)
  58     def __checkout(self, tree, iw):
  59         if not self.__stack.head_top_equal():
  60             out.error(
  61                 'HEAD and top are not the same.',
  62                 'This can happen if you modify a branch with git.',
  63                 '"stg repair --help" explains more about what to do next.')
  64             self.__abort()
  65         if self.__current_tree != tree:
  66             assert iw != None
  67             iw.checkout(self.__current_tree, tree)
  68             self.__current_tree = tree
  69     @staticmethod
  70     def __abort():
  71         raise TransactionException(
  72             'Command aborted (all changes rolled back)')
  73     def __check_consistency(self):
  74         remaining = set(self.__applied + self.__unapplied)
  75         for pn, commit in self.__patches.iteritems():
  76             if commit == None:
  77                 assert self.__stack.patches.exists(pn)
  78             else:
  79                 assert pn in remaining
  80     @property
  81     def __head(self):
  82         if self.__applied:
  83             return self.__patches[self.__applied[-1]]
  84         else:
  85             return self.__base
  86     def abort(self, iw = None):
  87         # The only state we need to restore is index+worktree.
  88         if iw:
  89             self.__checkout(self.__stack.head.data.tree, iw)
  90     def run(self, iw = None):
  91         self.__check_consistency()
  92         new_head = self.__head
  93
  94         # Set branch head.
  95         try:
  96             self.__checkout(new_head.data.tree, iw)
  97         except git.CheckoutException:
  98             # We have to abort the transaction.
  99             self.abort(iw)
 100             self.__abort()
 101         self.__stack.set_head(new_head, self.__msg)
 102
 103         if self.__error:
 104             out.error(self.__error)
 105
 106         # Write patches.
 107         for pn, commit in self.__patches.iteritems():
 108             if self.__stack.patches.exists(pn):
 109                 p = self.__stack.patches.get(pn)
 110                 if commit == None:
 111                     p.delete()
 112                 else:
 113                     p.set_commit(commit, self.__msg)
 114             else:
 115                 self.__stack.patches.new(pn, commit, self.__msg)
 116         _print_current_patch(self.__stack.patchorder.applied, self.__applied)
 117         self.__stack.patchorder.applied = self.__applied
 118         self.__stack.patchorder.unapplied = self.__unapplied
 119
 120         if self.__error:
 121             return utils.STGIT_CONFLICT
 122         else:
 123             return utils.STGIT_SUCCESS
 124
 125     def __halt(self, msg):
 126         self.__error = msg
 127         raise TransactionHalted(msg)
 128
 129     @staticmethod
 130     def __print_popped(popped):
 131         if len(popped) == 0:
 132             pass
 133         elif len(popped) == 1:
 134             out.info('Popped %s' % popped[0])
 135         else:
 136             out.info('Popped %s -- %s' % (popped[-1], popped[0]))
 137
 138     def pop_patches(self, p):
 139         """Pop all patches pn for which p(pn) is true. Return the list of
 140         other patches that had to be popped to accomplish this."""
 141         popped = []
 142         for i in xrange(len(self.applied)):
 143             if p(self.applied[i]):
 144                 popped = self.applied[i:]
 145                 del self.applied[i:]
 146                 break
 147         popped1 = [pn for pn in popped if not p(pn)]
 148         popped2 = [pn for pn in popped if p(pn)]
 149         self.unapplied = popped1 + popped2 + self.unapplied
 150         self.__print_popped(popped)
 151         return popped1
 152
 153     def delete_patches(self, p):
 154         """Delete all patches pn for which p(pn) is true. Return the list of
 155         other patches that had to be popped to accomplish this."""
 156         popped = []
 157         all_patches = self.applied + self.unapplied
 158         for i in xrange(len(self.applied)):
 159             if p(self.applied[i]):
 160                 popped = self.applied[i:]
 161                 del self.applied[i:]
 162                 break
 163         popped = [pn for pn in popped if not p(pn)]
 164         self.unapplied = popped + [pn for pn in self.unapplied if not p(pn)]
 165         self.__print_popped(popped)
 166         for pn in all_patches:
 167             if p(pn):
 168                 s = ['', ' (empty)'][self.patches[pn].data.is_nochange()]
 169                 self.patches[pn] = None
 170                 out.info('Deleted %s%s' % (pn, s))
 171         return popped
 172
 173     def push_patch(self, pn, iw = None):
 174         """Attempt to push the named patch. If this results in conflicts,
 175         halts the transaction. If index+worktree are given, spill any
 176         conflicts to them."""
 177         i = self.unapplied.index(pn)
 178         cd = self.patches[pn].data
 179         cd = cd.set_committer(None)
 180         s = ['', ' (empty)'][cd.is_nochange()]
 181         oldparent = cd.parent
 182         cd = cd.set_parent(self.__head)
 183         base = oldparent.data.tree
 184         ours = cd.parent.data.tree
 185         theirs = cd.tree
 186         tree = self.__stack.repository.simple_merge(base, ours, theirs)
 187         merge_conflict = False
 188         if not tree:
 189             if iw == None:
 190                 self.__halt('%s does not apply cleanly' % pn)
 191             try:
 192                 self.__checkout(ours, iw)
 193             except git.CheckoutException:
 194                 self.__halt('Index/worktree dirty')
 195             try:
 196                 iw.merge(base, ours, theirs)
 197                 tree = iw.index.write_tree()
 198                 self.__current_tree = tree
 199                 s = ' (modified)'
 200             except git.MergeException:
 201                 tree = ours
 202                 merge_conflict = True
 203                 s = ' (conflict)'
 204         cd = cd.set_tree(tree)
 205         self.patches[pn] = self.__stack.repository.commit(cd)
 206         del self.unapplied[i]
 207         self.applied.append(pn)
 208         out.info('Pushed %s%s' % (pn, s))
 209         if merge_conflict:
 210             self.__halt('Merge conflict')