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>

diff --git a/support/include/nfslib.h b/support/include/nfslib.h
index 53ece0e31c71995bccec85e5f2f4a99c6dbc989f..cee826bb6f5f9ecb160b02dbe019f839ee7edf36 100644 (file)
--- a/support/include/nfslib.h
+++ b/support/include/nfslib.h
@@ -25,6 +25,12 @@
 #ifndef _PATH_EXPORTS
 #define _PATH_EXPORTS          "/etc/exports"
 #endif
+#ifndef _PATH_EXPORTS_D
+#define _PATH_EXPORTS_D         "/etc/exports.d"
+#endif
+#ifndef _EXT_EXPORT
+#define _EXT_EXPORT             ".exports"
+#endif
 #ifndef _PATH_IDMAPDCONF
 #define _PATH_IDMAPDCONF       "/etc/idmapd.conf"
 #endif

diff --git a/utils/exportfs/exportfs.c b/utils/exportfs/exportfs.c
index b78957f249f44ae6c2226984e241ed6a2eb0fded..26d0504ee9e57afb4f8ecfdbd78ddfbfcfd29f61 100644 (file)
--- 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, ...)
 {