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diff --git a/src/applications/diffusion/ssh/DiffusionMercurialWireClientSSHProtocolChannel.php b/src/applications/diffusion/ssh/DiffusionMercurialWireClientSSHProtocolChannel.php
--- a/src/applications/diffusion/ssh/DiffusionMercurialWireClientSSHProtocolChannel.php
+++ b/src/applications/diffusion/ssh/DiffusionMercurialWireClientSSHProtocolChannel.php
@@ -180,6 +180,15 @@
$this->state = 'arguments';
}
} else if ($this->state == 'data-length') {
+
+ // We're reading the length of a chunk of raw data. It looks like
+ // this:
+ //
+ // <length-in-bytes>\n
+ //
+ // The length is human-readable text (for example, "4096"), and
+ // may be 0.
+
$line = $this->readProtocolLine();
if ($line === null) {
break;
@@ -192,6 +201,9 @@
$this->state = 'data-bytes';
}
} else if ($this->state == 'data-bytes') {
+
+ // We're reading some known, nonzero number of raw bytes of data.
+
// If we don't have any more bytes on the buffer yet, just bail:
// otherwise, we'll emit a pointless and possibly harmful 0-byte data
// frame. See T13036 for discussion.
@@ -203,6 +215,13 @@
$this->buffer = substr($this->buffer, strlen($bytes));
$this->expectBytes -= strlen($bytes);
+ // NOTE: We emit a data frame as soon as we read some data. This can
+ // cause us to repackage frames: for example, if we receive one large
+ // frame slowly, we may emit it as several smaller frames. In theory
+ // this is good; in practice, Mercurial never seems to select a frame
+ // size larger than 4096 bytes naturally and this may be more
+ // complexity and trouble than it is worth. See T13036.
+
$messages[] = $this->newDataMessage($bytes);
if (!$this->expectBytes) {

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