patch: handle symlinks without symlinkhunk

Symlink creations and deletions were handled with a special symlinkhunk object,
working like a binary hunk. However, this model does not support symlink
updates or replacements, so we teach regular hunks how to handle symlinks.

mercurial/patch.py

@@ -292,13 +292,15 b' class patchfile(object):'
         self.hunks = 0
 
     def readlines(self, fname):
+        if os.path.islink(fname):
+            return [os.readlink(fname)]
         fp = self.opener(fname, 'r')
         try:
             return list(linereader(fp, self.eol is not None))
         finally:
             fp.close()
 
-    def writelines(self, fname, lines):
+    def writelines(self, fname, lines):        
         fp = self.opener(fname, 'w')
         try:
             if self.eol and self.eol != '\n':
@@ -405,7 +407,7 b' class patchfile(object):'
             self.rej.append(h)
             return -1
 
-        if isinstance(h, githunk):
+        if isinstance(h, binhunk):
             if h.rmfile():
                 self.unlink(self.fname)
             else:
@@ -696,12 +698,12 b' class hunk(object):'
     def new(self, fuzz=0, toponly=False):
         return self.fuzzit(self.b, fuzz, toponly)
 
-class githunk(object):
-    """A git hunk"""
+class binhunk:
+    'A binary patch file. Only understands literals so far.'
     def __init__(self, gitpatch):
         self.gitpatch = gitpatch
         self.text = None
-        self.hunk = []
+        self.hunk = ['GIT binary patch\n']
 
     def createfile(self):
         return self.gitpatch.op in ('ADD', 'RENAME', 'COPY')
@@ -715,12 +717,6 b' class githunk(object):'
     def new(self):
         return [self.text]
 
-class binhunk(githunk):
-    'A binary patch file. Only understands literals so far.'
-    def __init__(self, gitpatch):
-        super(binhunk, self).__init__(gitpatch)
-        self.hunk = ['GIT binary patch\n']
-
     def extract(self, lr):
         line = lr.readline()
         self.hunk.append(line)
@@ -748,18 +744,6 b' class binhunk(githunk):'
                              len(text), size)
         self.text = text
 
-class symlinkhunk(githunk):
-    """A git symlink hunk"""
-    def __init__(self, gitpatch, hunk):
-        super(symlinkhunk, self).__init__(gitpatch)
-        self.hunk = hunk
-
-    def complete(self):
-        return True
-
-    def fix_newline(self):
-        return
-
 def parsefilename(str):
     # --- filename \t|space stuff
     s = str[4:].rstrip('\r\n')
@@ -897,10 +881,6 b' def iterhunks(ui, fp, sourcefile=None, t'
                 create = afile == '/dev/null' or gpatch and gpatch.op == 'ADD'
                 remove = bfile == '/dev/null' or gpatch and gpatch.op == 'DELETE'
                 current_hunk = hunk(x, hunknum + 1, lr, context, create, remove)
-                if remove:
-                    gpatch = changed.get(afile[2:])
-                    if gpatch and gpatch.mode[0]:
-                        current_hunk = symlinkhunk(gpatch, current_hunk)
             except PatchError, err:
                 ui.debug(err)
                 current_hunk = None

tests/test-mq-symlinks

@@ -8,12 +8,13 b' echo "mq=" >> $HGRCPATH'
 hg init
 hg qinit
 hg qnew base.patch
-echo a > a
-echo b > b
+echo aaa > a
+echo bbb > b
 hg add a b
 hg qrefresh
 $TESTDIR/readlink.py a
 
+echo '% test replacing a file with a symlink'
 hg qnew symlink.patch
 rm a
 ln -s b a
@@ -24,6 +25,7 b' hg qpop'
 hg qpush
 $TESTDIR/readlink.py a
 
+echo '% test symlink removal' 
 hg qnew removesl.patch
 hg rm a
 hg qrefresh --git

tests/test-mq-symlinks.out

@@ -1,9 +1,11 b''
 a -> a not a symlink
+% test replacing a file with a symlink
 a -> b
 now at: base.patch
 applying symlink.patch
 now at: symlink.patch
 a -> b
+% test symlink removal
 now at: symlink.patch
 applying removesl.patch
 now at: removesl.patch