From: Colin Watson <cjwatson@debian.org>
Date: Fri, 29 Mar 2024 01:24:32 +0000 (+0000)
Subject: Allow basic connectivity check via rrsync
X-Git-Tag: v3.4.0~19
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=1a95869dfcd966f3efef0aec07d1c787633ea638;p=thirdparty%2Frsync.git

Allow basic connectivity check via rrsync

rsbackup (https://github.com/ewxrjk/rsbackup) uses "ssh <host> true" to
check that the host in question is reachable.  I like to configure my
backed-up hosts to force the backup system to go via `rrsync`, but I
always have to add a local tweak to allow `SSH_ORIGINAL_COMMAND=true` to
work.  I think this would be safe enough to include in rrsync.
---

diff --git a/support/rrsync b/support/rrsync
index 4b4b87c5..e8b0cc0d 100755
--- a/support/rrsync
+++ b/support/rrsync
@@ -156,6 +156,10 @@ def main():
     command = os.environ.get('SSH_ORIGINAL_COMMAND', None)
     if not command:
         die("Not invoked via sshd")
+    if command == 'true':
+        # Allow checking connectivity with "ssh <host> true".  (For example,
+        # rsbackup uses this.)
+        sys.exit(0)
     command = command.split(' ', 2)
     if command[0:1] != ['rsync']:
         die("SSH_ORIGINAL_COMMAND does not run rsync")