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

[dexen deVries <dexen.devries@xxxxxxxxx>]

---
 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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