Read /etc/exports.d/*.export as extra export files

This patch adding a capability to read /etc/exports.d/*.exports as
extra export files to exportfs.

If one wants to add or remove an export entry in a script, currently
one may have to use sed or something tool for adding or removing the
line for the entry in /etc/exports file.

With the patch, adding and removing an entry from a script is much
easier.
cat<<EOF... or mv can be used for adding. rm can be used for removing.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>

1 files changed, 58 insertions, 1 deletions

diff --git a/utils/exportfs/exportfs.c b/utils/exportfs/exportfs.c
index b78957f..26d0504 100644
--- a/utils/exportfs/exportfs.c
+++ b/utils/exportfs/exportfs.c
@@ -25,6 +25,7 @@
 #include <fcntl.h>
 #include <netdb.h>
 #include <errno.h>
+#include <dirent.h>
 
 #include "sockaddr.h"
 #include "misc.h"
@@ -41,6 +42,7 @@ static void	error(nfs_export *exp, int err);
 static void	usage(const char *progname);
 static void	validate_export(nfs_export *exp);
 static int	matchhostname(const char *hostname1, const char *hostname2);
+static void	export_d_read(const char *dname);
 
 int
 main(int argc, char **argv)
@@ -127,8 +129,10 @@ main(int argc, char **argv)
 			return 0;
 		}
 	}
-	if (f_export && ! f_ignore)
+	if (f_export && ! f_ignore) {
 		export_read(_PATH_EXPORTS);
+		export_d_read(_PATH_EXPORTS_D);
+	}
 	if (f_export) {
 		if (f_all)
 			export_all(f_verbose);
@@ -485,6 +489,59 @@ out:
 	return result;
 }
 
+/* Based on mnt_table_parse_dir() in
+   util-linux-ng/shlibs/mount/src/tab_parse.c */
+static void
+export_d_read(const char *dname)
+{
+	int n = 0, i;
+	struct dirent **namelist = NULL;
+
+
+	n = scandir(dname, &namelist, NULL, versionsort);
+	if (n < 0)
+		xlog(L_NOTICE, "scandir %s: %s\n", dname, strerror(errno));
+	else if (n == 0)
+		return;
+
+	for (i = 0; i < n; i++) {
+		struct dirent *d = namelist[i];
+		size_t namesz;
+		char fname[PATH_MAX + 1];
+		int fname_len;
+
+
+		if (d->d_type != DT_UNKNOWN 
+		    && d->d_type != DT_REG
+		    && d->d_type != DT_LNK)
+			continue;
+		if (*d->d_name == '.')
+			continue;
+
+#define _EXT_EXPORT_SIZ   (sizeof(_EXT_EXPORT) - 1)
+		namesz = strlen(d->d_name);
+		if (!namesz 
+		    || namesz < _EXT_EXPORT_SIZ + 1
+		    || strcmp(d->d_name + (namesz - _EXT_EXPORT_SIZ),
+			      _EXT_EXPORT))
+			continue;
+
+		fname_len = snprintf(fname, PATH_MAX +1, "%s/%s", dname, d->d_name);
+		if (fname_len > PATH_MAX) {
+			xlog(L_WARNING, "Too long file name: %s in %s\n", d->d_name, dname);
+			continue;
+		}
+
+		export_read(fname);
+	}
+		
+	for (i = 0; i < n; i++)
+		free(namelist[i]);
+	free(namelist);
+
+	return;
+}
+
 static char
 dumpopt(char c, char *fmt, ...)
 {