diff --git a/remotefilelog/__init__.py b/remotefilelog/__init__.py
--- a/remotefilelog/__init__.py
+++ b/remotefilelog/__init__.py
@@ -748,7 +748,7 @@
                 repackmod.incrementalrepack(repo)
                 filesrepacked = True
                 continue
-            except IOError:
+            except (IOError, repackmod.RepackAlreadyRunning):
                 # If repack cannot be performed due to not enough disk space
                 # continue doing garbage collection of loose files w/o repack
                 pass
@@ -1038,7 +1038,12 @@
 
     options = {'packsonly': opts.get('packsonly')}
 
-    if opts.get('incremental'):
-        repackmod.incrementalrepack(repo, options=options)
-    else:
-        repackmod.fullrepack(repo, options=options)
+    try:
+        if opts.get('incremental'):
+            repackmod.incrementalrepack(repo, options=options)
+        else:
+            repackmod.fullrepack(repo, options=options)
+    except repackmod.RepackAlreadyRunning as ex:
+        # Don't propogate the exception if the repack is already in
+        # progress, since we want the command to exit 0.
+        repo.ui.warn('%s\n' % ex)
diff --git a/remotefilelog/repack.py b/remotefilelog/repack.py
--- a/remotefilelog/repack.py
+++ b/remotefilelog/repack.py
@@ -28,6 +28,9 @@
 
 osutil = policy.importmod(r'osutil')
 
+class RepackAlreadyRunning(error.Abort):
+    pass
+
 def backgroundrepack(repo, incremental=True, packsonly=False):
     cmd = [util.hgexecutable(), '-R', repo.origroot, 'repack']
     msg = _("(running background repack)\n")
@@ -360,8 +363,8 @@
             try:
                 packer.run(dpack, hpack)
             except error.LockHeld:
-                raise error.Abort(_("skipping repack - another repack is "
-                                    "already running"))
+                raise RepackAlreadyRunning(_("skipping repack - another repack "
+                                             "is already running"))
 
 def keepset(repo, keyfn, lastkeepkeys=None):
     """Computes a keepset which is not garbage collected.
diff --git a/tests/test-remotefilelog-repack-fast.t b/tests/test-remotefilelog-repack-fast.t
--- a/tests/test-remotefilelog-repack-fast.t
+++ b/tests/test-remotefilelog-repack-fast.t
@@ -124,8 +124,7 @@
   $ hg repack --config "hooks.prerepack=sleep 3" &
   $ sleep 1
   $ hg repack
-  abort: skipping repack - another repack is already running
-  [255]
+  skipping repack - another repack is already running
   $ hg debugwaitonrepack >/dev/null 2>&1
 
 # Run repack in the background
diff --git a/tests/test-remotefilelog-repack.t b/tests/test-remotefilelog-repack.t
--- a/tests/test-remotefilelog-repack.t
+++ b/tests/test-remotefilelog-repack.t
@@ -132,8 +132,7 @@
   $ hg repack --config "hooks.prerepack=sleep 3" &
   $ sleep 1
   $ hg repack
-  abort: skipping repack - another repack is already running
-  [255]
+  skipping repack - another repack is already running
   $ hg debugwaitonrepack >/dev/null 2>&1
 
 # Run repack in the background