[PATCH 4/8] lssu: support opening mounted filesystem by directory pathname

[dexen deVries]

---
 bin/lssu.c |   34 ++++++++++++++++++++++++++++------
 1 files changed, 28 insertions(+), 6 deletions(-)

diff --git a/bin/lssu.c b/bin/lssu.c
index c5cd519..e8dccc3 100644
--- a/bin/lssu.c
+++ b/bin/lssu.c
@@ -27,6 +27,14 @@
 #include "config.h"
 #endif /* HAVE_CONFIG_H */
 
+#if HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif /* HAVE_SYS_TYPES_H */
+
+#if HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif /* HAVE_SYS_STAT_H */
+
 #include <stdio.h>
 
 #if HAVE_STDLIB_H
@@ -138,14 +146,16 @@ static int lssu_list_suinfo(struct nilfs *nilfs, int all)
 int main(int argc, char *argv[])
 {
        struct nilfs *nilfs;
-       char *dev, *progname;
-       int c, all, status;
+       struct stat statbuf;
+       char *dev, *dir, *pathname, *progname;
+       int c, all, status, ret;
 #ifdef _GNU_SOURCE
        int option_index;
 #endif /* _GNU_SOURCE */
 
        all = 0;
        opterr = 0;
+       dev = dir = NULL;
        progname = strrchr(argv[0], '/');
        if (progname == NULL)
                progname = argv[0];
@@ -184,18 +194,30 @@ int main(int argc, char *argv[])
        }
 
        if (optind > argc - 1) {
-               dev = NULL;
+               pathname = NULL;
        } else if (optind == argc - 1) {
-               dev = argv[optind++];
+               pathname = argv[optind++];
        } else {
                fprintf(stderr, "%s: too many arguments\n", progname);
                exit(1);
        }
 
-       nilfs = nilfs_open(dev, NULL, NILFS_OPEN_RDONLY);
+       if (pathname) {
+               ret = stat(pathname, &statbuf);
+               if (ret == -1) {
+                       fprintf(stderr, "%s: cannot open %s: %s\n",
+                               progname, pathname, strerror(errno));
+                       exit(EXIT_FAILURE);
+               }
+               if (S_ISDIR(statbuf.st_mode))
+                       dir = pathname;
+               else
+                       dev = pathname;
+       }
+       nilfs = nilfs_open(dev, dir, NILFS_OPEN_RDONLY);
        if (nilfs == NULL) {
                fprintf(stderr, "%s: %s: cannot open NILFS\n",
-                       progname, dev);
+                       progname, pathname);
                exit(1);
        }
 
-- 
1.7.4.1

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