A crude attempt to add two new daemon module options:

    pre-exec = COMMAND
    post-exec = COMMAND

The pre-exec command runs prior to the chroot() (if enabled) as the daemon user.

The post-exec command runs inside any chroot() as the module user.

You'll want to run "make proto" after applying this patch.

--- orig/cleanup.c	2005-03-05 18:58:38
+++ cleanup.c	2005-06-10 21:32:40
@@ -21,9 +21,13 @@
 
 #include "rsync.h"
 
+extern int am_daemon;
+extern int am_sender;
+extern int am_generator;
 extern int io_error;
 extern int keep_partial;
 extern int log_got_error;
+extern int module_id;
 extern char *partial_dir;
 
 /**
@@ -152,6 +156,16 @@ void _exit_cleanup(int code, const char 
 			ocode, safe_fname(file), line, code);
 	}
 
+	if (am_daemon && (am_sender || am_generator)) {
+		char *p = lp_post_exec(module_id);
+		if (p && *p) {
+			char *arg;
+			if (asprintf(&arg, "RSYNC_EXIT_STATUS=%d", code) == 0)
+				putenv(arg); /* XXX Need configure support? */
+			system(p); /* XXX Check for errors */
+		}
+	}
+
 	close_all();
 	exit(code);
 }
--- orig/clientserver.c	2005-06-10 21:33:27
+++ clientserver.c	2005-06-10 21:25:25
@@ -347,6 +347,10 @@ static int rsync_module(int f_in, int f_
 
 	log_init();
 
+	p = lp_pre_exec(i);
+	if (p && *p)
+		system(p); /* XXX Check for errors */
+
 	if (use_chroot) {
 		/*
 		 * XXX: The 'use chroot' flag is a fairly reliable
--- orig/loadparm.c	2005-06-10 21:33:28
+++ loadparm.c	2005-06-10 21:25:25
@@ -140,6 +140,8 @@ typedef struct
 	char *log_format;
 	char *refuse_options;
 	char *dont_compress;
+	char *pre_exec;
+	char *post_exec;
 	int timeout;
 	int max_connections;
 	int max_verbosity;
@@ -175,6 +177,8 @@ static service sDefault =
 	"%o %h [%a] %m (%u) %f %l",    /* log format */
 	NULL,    /* refuse options */
 	"*.gz *.tgz *.zip *.z *.rpm *.deb *.iso *.bz2 *.tbz",    /* dont compress */
+	NULL,     /* pre_exec */
+	NULL,     /* post_exec */
 	0,        /* timeout */
 	0,        /* max connections */
 	1,        /* max verbosity */
@@ -298,6 +302,8 @@ static struct parm_struct parm_table[] =
   {"log format",       P_STRING,  P_LOCAL,  &sDefault.log_format,  NULL,   0},
   {"refuse options",   P_STRING,  P_LOCAL,  &sDefault.refuse_options,NULL, 0},
   {"dont compress",    P_STRING,  P_LOCAL,  &sDefault.dont_compress,NULL,  0},
+  {"pre-exec",         P_STRING,  P_LOCAL,  &sDefault.pre_exec,    NULL,   0},
+  {"post-exec",        P_STRING,  P_LOCAL,  &sDefault.post_exec,   NULL,   0},
   {NULL,               P_BOOL,    P_NONE,   NULL,                  NULL,   0}
 };
 
@@ -379,6 +385,8 @@ FN_LOCAL_STRING(lp_include_from, include
 FN_LOCAL_STRING(lp_log_format, log_format)
 FN_LOCAL_STRING(lp_refuse_options, refuse_options)
 FN_LOCAL_STRING(lp_dont_compress, dont_compress)
+FN_LOCAL_STRING(lp_pre_exec, pre_exec)
+FN_LOCAL_STRING(lp_post_exec, post_exec)
 FN_LOCAL_INTEGER(lp_timeout, timeout)
 FN_LOCAL_INTEGER(lp_max_connections, max_connections)
 FN_LOCAL_INTEGER(lp_max_verbosity, max_verbosity)