largefiles: use context for file closing

Make the code slightly smaller and safer (and more deeply indented).

hgext/largefiles/basestore.py

@@ -91,15 +91,13 b' class basestore(object):'
         storefilename = lfutil.storepath(self.repo, hash)
 
         tmpname = storefilename + '.tmp'
-        tmpfile = util.atomictempfile(tmpname,
-                                      createmode=self.repo.store.createmode)
-
-        try:
-            gothash = self._getfile(tmpfile, filename, hash)
-        except StoreError as err:
-            self.ui.warn(err.longmessage())
-            gothash = ""
-        tmpfile.close()
+        with util.atomictempfile(tmpname,
+                createmode=self.repo.store.createmode) as tmpfile:
+            try:
+                gothash = self._getfile(tmpfile, filename, hash)
+            except StoreError as err:
+                self.ui.warn(err.longmessage())
+                gothash = ""
 
         if gothash != hash:
             if gothash != "":

hgext/largefiles/lfutil.py

@@ -54,10 +54,10 b' def link(src, dest):'
         util.oslink(src, dest)
     except OSError:
         # if hardlinks fail, fallback on atomic copy
-        dst = util.atomictempfile(dest)
-        for chunk in util.filechunkiter(open(src, 'rb')):
-            dst.write(chunk)
-        dst.close()
+        with open(src, 'rb') as srcf:
+            with util.atomictempfile(dest) as dstf:
+                for chunk in util.filechunkiter(srcf):
+                    dstf.write(chunk)
         os.chmod(dest, os.stat(src).st_mode)
 
 def usercachepath(ui, hash):
@@ -264,11 +264,11 b' def copytostoreabsolute(repo, file, hash'
         link(usercachepath(repo.ui, hash), storepath(repo, hash))
     else:
         util.makedirs(os.path.dirname(storepath(repo, hash)))
-        dst = util.atomictempfile(storepath(repo, hash),
-                                  createmode=repo.store.createmode)
-        for chunk in util.filechunkiter(open(file, 'rb')):
-            dst.write(chunk)
-        dst.close()
+        with open(file, 'rb') as srcf:
+            with util.atomictempfile(storepath(repo, hash),
+                                     createmode=repo.store.createmode) as dstf:
+                for chunk in util.filechunkiter(srcf):
+                    dstf.write(chunk)
         linktousercache(repo, hash)
 
 def linktousercache(repo, hash):
@@ -370,10 +370,9 b' def hashfile(file):'
     if not os.path.exists(file):
         return ''
     hasher = hashlib.sha1('')
-    fd = open(file, 'rb')
-    for data in util.filechunkiter(fd, 128 * 1024):
-        hasher.update(data)
-    fd.close()
+    with open(file, 'rb') as fd:
+        for data in util.filechunkiter(fd, 128 * 1024):
+            hasher.update(data)
     return hasher.hexdigest()
 
 def getexecutable(filename):

hgext/largefiles/overrides.py

@@ -883,11 +883,8 b' def hgclone(orig, ui, opts, *args, **kwa'
 
         # If largefiles is required for this repo, permanently enable it locally
         if 'largefiles' in repo.requirements:
-            fp = repo.vfs('hgrc', 'a', text=True)
-            try:
+            with repo.vfs('hgrc', 'a', text=True) as fp:
                 fp.write('\n[extensions]\nlargefiles=\n')
-            finally:
-                fp.close()
 
         # Caching is implicitly limited to 'rev' option, since the dest repo was
         # truncated at that point.  The user may expect a download count with
@@ -1339,30 +1336,28 b' def overridecat(orig, ui, repo, file1, *'
     m.visitdir = lfvisitdirfn
 
     for f in ctx.walk(m):
-        fp = cmdutil.makefileobj(repo, opts.get('output'), ctx.node(),
-                                 pathname=f)
-        lf = lfutil.splitstandin(f)
-        if lf is None or origmatchfn(f):
-            # duplicating unreachable code from commands.cat
-            data = ctx[f].data()
-            if opts.get('decode'):
-                data = repo.wwritedata(f, data)
-            fp.write(data)
-        else:
-            hash = lfutil.readstandin(repo, lf, ctx.rev())
-            if not lfutil.inusercache(repo.ui, hash):
-                store = storefactory.openstore(repo)
-                success, missing = store.get([(lf, hash)])
-                if len(success) != 1:
-                    raise error.Abort(
-                        _('largefile %s is not in cache and could not be '
-                          'downloaded')  % lf)
-            path = lfutil.usercachepath(repo.ui, hash)
-            fpin = open(path, "rb")
-            for chunk in util.filechunkiter(fpin, 128 * 1024):
-                fp.write(chunk)
-            fpin.close()
-        fp.close()
+        with cmdutil.makefileobj(repo, opts.get('output'), ctx.node(),
+                                 pathname=f) as fp:
+            lf = lfutil.splitstandin(f)
+            if lf is None or origmatchfn(f):
+                # duplicating unreachable code from commands.cat
+                data = ctx[f].data()
+                if opts.get('decode'):
+                    data = repo.wwritedata(f, data)
+                fp.write(data)
+            else:
+                hash = lfutil.readstandin(repo, lf, ctx.rev())
+                if not lfutil.inusercache(repo.ui, hash):
+                    store = storefactory.openstore(repo)
+                    success, missing = store.get([(lf, hash)])
+                    if len(success) != 1:
+                        raise error.Abort(
+                            _('largefile %s is not in cache and could not be '
+                              'downloaded')  % lf)
+                path = lfutil.usercachepath(repo.ui, hash)
+                with open(path, "rb") as fpin:
+                    for chunk in util.filechunkiter(fpin, 128 * 1024):
+                        fp.write(chunk)
         err = 0
     return err
 

hgext/largefiles/remotestore.py

@@ -45,17 +45,13 b' class remotestore(basestore.basestore):'
 
     def sendfile(self, filename, hash):
         self.ui.debug('remotestore: sendfile(%s, %s)\n' % (filename, hash))
-        fd = None
         try:
-            fd = lfutil.httpsendfile(self.ui, filename)
-            return self._put(hash, fd)
+            with lfutil.httpsendfile(self.ui, filename) as fd:
+                return self._put(hash, fd)
         except IOError as e:
             raise error.Abort(
                 _('remotestore: could not open file %s: %s')
                 % (filename, str(e)))
-        finally:
-            if fd:
-                fd.close()
 
     def _getfile(self, tmpfile, filename, hash):
         try:

mercurial/cmdutil.py

@@ -499,6 +499,12 b' class _unclosablefile(object):'
     def __getattr__(self, attr):
         return getattr(self._fp, attr)
 
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_value, exc_tb):
+        pass
+
 def makefileobj(repo, pat, node=None, desc=None, total=None,
                 seqno=None, revwidth=None, mode='wb', modemap=None,
                 pathname=None):

mercurial/httpconnection.py

@@ -58,6 +58,12 b' class httpsendfile(object):'
                          unit=_('kb'), total=self._total)
         return ret
 
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        self.close()
+
 # moved here from url.py to avoid a cycle
 def readauthforuri(ui, uri, user):
     # Read configuration