diff --git a/mercurial/configitems.py b/mercurial/configitems.py
--- a/mercurial/configitems.py
+++ b/mercurial/configitems.py
@@ -574,6 +574,9 @@
 coreconfigitem('experimental', 'update.atomic-file',
     default=False,
 )
+coreconfigitem('experimental', 'server.revfilesdata',
+    default=False,
+)
 coreconfigitem('experimental', 'sshpeer.advertise-v2',
     default=False,
 )
diff --git a/mercurial/help/internals/wireprotocol.txt b/mercurial/help/internals/wireprotocol.txt
--- a/mercurial/help/internals/wireprotocol.txt
+++ b/mercurial/help/internals/wireprotocol.txt
@@ -1247,6 +1247,37 @@
 
 The return type is a ``string``.
 
+exp-revsfilesdata-001
+---------------------
+
+**(Experimental and subject to behavior changes)**
+
+This command allows obtaining the fulltext of files data for a specific
+revision.
+
+The ``node`` argument defines the revision whose file data is to
+be retrieved.
+
+The response is a stream consisting of a series of files data records.
+Each record begins with a 31 byte struct. The struct contains:
+
+* 20 bytes file node.
+* 16-bit unsigned little-endian integer defining the size of the file
+  name.
+* 64-bit unsigned little-endian integer defining the size of the file
+  data.
+* 1 byte containing file flags.
+
+The file flags byte has the ``0x01`` bit set if the file is executable.
+The ``0x02`` bit is set if the file is a symlink. If a symlink, the raw
+file data refers to the target of the symlink.
+
+Following that struct is the raw filename of the file. This is a raw
+byte string and has no encoding (Mercurial stores filenames as binary
+byte sequences). Following the filename is the raw file data.
+Following the raw file data is the next file record struct, or end of
+stream.
+
 getbundle
 ---------
 
diff --git a/mercurial/wireproto.py b/mercurial/wireproto.py
--- a/mercurial/wireproto.py
+++ b/mercurial/wireproto.py
@@ -9,6 +9,7 @@
 
 import hashlib
 import os
+import struct
 import tempfile
 
 from .i18n import _
@@ -1132,3 +1133,59 @@
                 bundler.newpart('error:pushraced',
                                 [('message', util.forcebytestr(exc))])
             return streamres_legacy(gen=bundler.getchunks())
+
+@wireprotocommand('exp-revfilesdata-001', 'node',
+                  permission='pull')
+def revfilesdata(repo, proto, node):
+    """Obtain file data for a particular revision.
+
+    Given a node, emit metadata about files in that revision and their data.
+
+    TODO support receiving a narrow spec, integrating with a matcher.
+    TODO only expose to transport version 2
+    """
+    if not repo.ui.configbool('experimental', 'server.revfilesdata'):
+        return wireprototypes.ooberror(_('revfilesdata wire protocol command '
+                                         'is not enabled'))
+
+    if len(node) != 40:
+        return wireprototypes.ooberror(_('nodes argument must be 40 bytes'))
+
+    try:
+        ctx = repo[bin(node)]
+    except error.RepoLookupError:
+        return wireprototypes.ooberror(_('unknown node: %s') % node)
+
+    pathflags = {}
+
+    def makeentries():
+        for (path, node, flags) in ctx.manifest().iterentries():
+            pathflags[path] = flags
+            yield path, node
+
+    results = repo.filesstore.resolvefilesdata(makeentries())
+
+    # Output consists of structs followed by raw data.
+    s = struct.Struct(r'<20sHQB')
+
+    def emitdata():
+        for result, path, node, data in results:
+            flags = pathflags[path]
+            del pathflags[path]
+
+            if result == 'ok':
+                rawflag = 0
+                if b'x' in flags:
+                    rawflag |= 1
+                if b'l' in flags:
+                    rawflag |= 2
+
+                yield s.pack(node, len(path), len(data), rawflag)
+                yield path
+                yield data
+
+            else:
+                raise error.ProgrammingError('do not yet handle %s results' %
+                                             result)
+
+    return wireprototypes.streamres(emitdata())
diff --git a/tests/test-wireproto-revsfiledata.t b/tests/test-wireproto-revsfiledata.t
new file mode 100644
--- /dev/null
+++ b/tests/test-wireproto-revsfiledata.t
@@ -0,0 +1,244 @@
+  $ CMDNAME=exp-revfilesdata-001
+
+  $ cat >> $HGRCPATH << EOF
+  > [server]
+  > compressionengines = none
+  > EOF
+
+  $ hg init server
+  $ cd server
+  $ echo 'foo revision 0' > foo
+  $ hg -q commit -A -m initial
+  $ echo 'foo revision 1' > foo
+  $ echo 'bar 0' > bar
+  $ hg -q commit -A -m second
+  $ chmod +x foo
+  $ hg commit -m third
+
+revfilesdata requires a config options
+
+  $ hg serve -p $HGPORT -d --pid-file hg.pid
+  $ cat hg.pid > $DAEMON_PIDS
+
+  $ hg --verbose debugwireproto --peer raw http://$LOCALIP:$HGPORT << EOF
+  > httprequest GET ?cmd=$CMDNAME
+  >     user-agent: test
+  >     x-hgarg-1: node=irrelevant
+  >     x-hgproto-1: 0.2
+  > EOF
+  using raw connection to peer
+  s>     GET /?cmd=exp-revfilesdata-001 HTTP/1.1\r\n
+  s>     Accept-Encoding: identity\r\n
+  s>     user-agent: test\r\n
+  s>     x-hgarg-1: node=irrelevant\r\n
+  s>     x-hgproto-1: 0.2\r\n
+  s>     host: $LOCALIP:$HGPORT\r\n (glob)
+  s>     \r\n
+  s> makefile('rb', None)
+  s>     HTTP/1.1 200 Script output follows\r\n
+  s>     Server: testing stub value\r\n
+  s>     Date: $HTTP_DATE$\r\n
+  s>     Content-Type: application/hg-error\r\n
+  s>     Content-Length: 49\r\n
+  s>     \r\n
+  s>     revfilesdata wire protocol command is not enabled
+
+  $ cat >> $HGRCPATH << EOF
+  > [experimental]
+  > server.revfilesdata = true
+  > EOF
+
+  $ killdaemons.py
+  $ hg serve -p $HGPORT -d --pid-file hg.pid
+  $ cat hg.pid > $DAEMON_PIDS
+
+Node must be full hash
+
+  $ hg --verbose debugwireproto --peer raw http://$LOCALIP:$HGPORT << EOF
+  > httprequest GET ?cmd=$CMDNAME
+  >     user-agent: test
+  >     x-hgarg-1: node=tip
+  >     x-hgproto-1: 0.2
+  > EOF
+  using raw connection to peer
+  s>     GET /?cmd=exp-revfilesdata-001 HTTP/1.1\r\n
+  s>     Accept-Encoding: identity\r\n
+  s>     user-agent: test\r\n
+  s>     x-hgarg-1: node=tip\r\n
+  s>     x-hgproto-1: 0.2\r\n
+  s>     host: $LOCALIP:$HGPORT\r\n (glob)
+  s>     \r\n
+  s> makefile('rb', None)
+  s>     HTTP/1.1 200 Script output follows\r\n
+  s>     Server: testing stub value\r\n
+  s>     Date: $HTTP_DATE$\r\n
+  s>     Content-Type: application/hg-error\r\n
+  s>     Content-Length: 31\r\n
+  s>     \r\n
+  s>     nodes argument must be 40 bytes
+
+And it must be a known hash
+
+  $ hg --verbose debugwireproto --peer raw http://$LOCALIP:$HGPORT << EOF
+  > httprequest GET ?cmd=$CMDNAME
+  >     user-agent: test
+  >     x-hgarg-1: node=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+  >     x-hgproto-1: 0.2
+  > EOF
+  using raw connection to peer
+  s>     GET /?cmd=exp-revfilesdata-001 HTTP/1.1\r\n
+  s>     Accept-Encoding: identity\r\n
+  s>     user-agent: test\r\n
+  s>     x-hgarg-1: node=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\r\n
+  s>     x-hgproto-1: 0.2\r\n
+  s>     host: $LOCALIP:$HGPORT\r\n (glob)
+  s>     \r\n
+  s> makefile('rb', None)
+  s>     HTTP/1.1 200 Script output follows\r\n
+  s>     Server: testing stub value\r\n
+  s>     Date: $HTTP_DATE$\r\n
+  s>     Content-Type: application/hg-error\r\n
+  s>     Content-Length: 54\r\n
+  s>     \r\n
+  s>     unknown node: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+
+Request for revision with single file
+
+  $ hg --verbose debugwireproto --peer raw http://$LOCALIP:$HGPORT << EOF
+  > httprequest GET ?cmd=$CMDNAME
+  >     user-agent: test
+  >     x-hgarg-1: node=a64d23ad96a87844da3723df73c209a1c5507999
+  >     x-hgproto-1: 0.2
+  > EOF
+  using raw connection to peer
+  s>     GET /?cmd=exp-revfilesdata-001 HTTP/1.1\r\n
+  s>     Accept-Encoding: identity\r\n
+  s>     user-agent: test\r\n
+  s>     x-hgarg-1: node=a64d23ad96a87844da3723df73c209a1c5507999\r\n
+  s>     x-hgproto-1: 0.2\r\n
+  s>     host: $LOCALIP:$HGPORT\r\n (glob)
+  s>     \r\n
+  s> makefile('rb', None)
+  s>     HTTP/1.1 200 Script output follows\r\n
+  s>     Server: testing stub value\r\n
+  s>     Date: $HTTP_DATE$\r\n
+  s>     Content-Type: application/mercurial-0.2\r\n
+  s>     Transfer-Encoding: chunked\r\n
+  s>     \r\n
+  s>     1\r\n
+  s>     \x04
+  s>     \r\n
+  s>     4\r\n
+  s>     none
+  s>     \r\n
+  s>     1f\r\n
+  s>     F\x92\xc6\xd5/y\x90\xcce\x0c\xea\x80\xd0\xca\xe1\xde6\xb5wX\x03\x00\x0f\x00\x00\x00\x00\x00\x00\x00\x00
+  s>     \r\n
+  s>     3\r\n
+  s>     foo
+  s>     \r\n
+  s>     f\r\n
+  s>     foo revision 0\n
+  s>     \r\n
+  s>     0\r\n
+  s>     \r\n
+
+Revision with multiple files
+
+  $ hg --verbose debugwireproto --peer raw http://$LOCALIP:$HGPORT << EOF
+  > httprequest GET ?cmd=$CMDNAME
+  >     user-agent: test
+  >     x-hgarg-1: node=bc56cef01319bf181be2886f8a3aefea9a33bfdb
+  >     x-hgproto-1: 0.2
+  > EOF
+  using raw connection to peer
+  s>     GET /?cmd=exp-revfilesdata-001 HTTP/1.1\r\n
+  s>     Accept-Encoding: identity\r\n
+  s>     user-agent: test\r\n
+  s>     x-hgarg-1: node=bc56cef01319bf181be2886f8a3aefea9a33bfdb\r\n
+  s>     x-hgproto-1: 0.2\r\n
+  s>     host: $LOCALIP:$HGPORT\r\n (glob)
+  s>     \r\n
+  s> makefile('rb', None)
+  s>     HTTP/1.1 200 Script output follows\r\n
+  s>     Server: testing stub value\r\n
+  s>     Date: $HTTP_DATE$\r\n
+  s>     Content-Type: application/mercurial-0.2\r\n
+  s>     Transfer-Encoding: chunked\r\n
+  s>     \r\n
+  s>     1\r\n
+  s>     \x04
+  s>     \r\n
+  s>     4\r\n
+  s>     none
+  s>     \r\n
+  s>     1f\r\n
+  s>     \xdb&\xb9\xed\xe1\xcc\xd5]\xdact\xb01\x14h\xda\xe3\xc2\xe2\xd9\x03\x00\x06\x00\x00\x00\x00\x00\x00\x00\x00
+  s>     \r\n
+  s>     3\r\n
+  s>     bar
+  s>     \r\n
+  s>     6\r\n
+  s>     bar 0\n
+  s>     \r\n
+  s>     1f\r\n
+  s>     $\x95\x1c\xb3\x8e(\xc6>\xf8\x0cx\\\x88G\xbd\xd3[\x08\x13c\x03\x00\x0f\x00\x00\x00\x00\x00\x00\x00\x00
+  s>     \r\n
+  s>     3\r\n
+  s>     foo
+  s>     \r\n
+  s>     f\r\n
+  s>     foo revision 1\n
+  s>     \r\n
+  s>     0\r\n
+  s>     \r\n
+
+And with the executable bit set
+
+  $ hg --verbose debugwireproto --peer raw http://$LOCALIP:$HGPORT << EOF
+  > httprequest GET ?cmd=$CMDNAME
+  >     user-agent: test
+  >     x-hgarg-1: node=328fdcd53a5d2f0dd58397e1f1ed73d5913332fe
+  >     x-hgproto-1: 0.2
+  > EOF
+  using raw connection to peer
+  s>     GET /?cmd=exp-revfilesdata-001 HTTP/1.1\r\n
+  s>     Accept-Encoding: identity\r\n
+  s>     user-agent: test\r\n
+  s>     x-hgarg-1: node=328fdcd53a5d2f0dd58397e1f1ed73d5913332fe\r\n
+  s>     x-hgproto-1: 0.2\r\n
+  s>     host: $LOCALIP:$HGPORT\r\n (glob)
+  s>     \r\n
+  s> makefile('rb', None)
+  s>     HTTP/1.1 200 Script output follows\r\n
+  s>     Server: testing stub value\r\n
+  s>     Date: $HTTP_DATE$\r\n
+  s>     Content-Type: application/mercurial-0.2\r\n
+  s>     Transfer-Encoding: chunked\r\n
+  s>     \r\n
+  s>     1\r\n
+  s>     \x04
+  s>     \r\n
+  s>     4\r\n
+  s>     none
+  s>     \r\n
+  s>     1f\r\n
+  s>     \xdb&\xb9\xed\xe1\xcc\xd5]\xdact\xb01\x14h\xda\xe3\xc2\xe2\xd9\x03\x00\x06\x00\x00\x00\x00\x00\x00\x00\x00
+  s>     \r\n
+  s>     3\r\n
+  s>     bar
+  s>     \r\n
+  s>     6\r\n
+  s>     bar 0\n
+  s>     \r\n
+  s>     1f\r\n
+  s>     $\x95\x1c\xb3\x8e(\xc6>\xf8\x0cx\\\x88G\xbd\xd3[\x08\x13c\x03\x00\x0f\x00\x00\x00\x00\x00\x00\x00\x01
+  s>     \r\n
+  s>     3\r\n
+  s>     foo
+  s>     \r\n
+  s>     f\r\n
+  s>     foo revision 1\n
+  s>     \r\n
+  s>     0\r\n
+  s>     \r\n