[src/trunk]: src/usr.sbin/fstyp fstyp: Consider '@' syntax in device file pat...

[tkusumi <tkusumi%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/e49c416ac3c2
branches:  trunk
changeset: 847688:e49c416ac3c2
user:      tkusumi <tkusumi%NetBSD.org@localhost>
date:      Wed Jan 01 12:47:19 2020 +0000

description:
fstyp: Consider '@' syntax in device file path for HAMMER2

though devpath is unsupported in NetBSD atm.
taken-from: DragonFlyBSD

diffstat:

 usr.sbin/fstyp/fstyp.c |  33 ++++++++++++++++++++++++++-------
 1 files changed, 26 insertions(+), 7 deletions(-)

diffs (64 lines):

diff -r cda6f20e5f51 -r e49c416ac3c2 usr.sbin/fstyp/fstyp.c
--- a/usr.sbin/fstyp/fstyp.c    Wed Jan 01 12:46:44 2020 +0000
+++ b/usr.sbin/fstyp/fstyp.c    Wed Jan 01 12:47:19 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: fstyp.c,v 1.10 2020/01/01 09:17:27 tkusumi Exp $       */
+/*     $NetBSD: fstyp.c,v 1.11 2020/01/01 12:47:19 tkusumi Exp $       */
 
 /*-
  * Copyright (c) 2017 The NetBSD Foundation, Inc.
@@ -35,8 +35,9 @@
  *
  */
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: fstyp.c,v 1.10 2020/01/01 09:17:27 tkusumi Exp $");
+__RCSID("$NetBSD: fstyp.c,v 1.11 2020/01/01 12:47:19 tkusumi Exp $");
 
+#include <sys/param.h>
 #include <sys/disklabel.h>
 #include <sys/dkio.h>
 #include <sys/ioctl.h>
@@ -185,7 +186,9 @@
        int ch, error, i, nbytes;
        bool ignore_type = false, show_unmountable = false;
        char label[LABEL_LEN + 1], strvised[LABEL_LEN * 4 + 1];
-       char *path;
+       char fdpath[MAXPATHLEN];
+       char *p;
+       const char *path;
        const char *name = NULL;
        FILE *fp;
        fstyp_function fstyp_f;
@@ -233,12 +236,28 @@
                }
        }
 
-       fp = fopen(path, "r");
-       if (fp == NULL)
-               goto fsvtyp; /* DragonFly */
+       /*
+        * DragonFly: Filesystems may have syntax to decorate path.
+        * Make a wild guess.
+        * XXX devpath is unsupported in NetBSD, but at least parse '@' for fp.
+        */
+       strlcpy(fdpath, path, sizeof(fdpath));
+       p = strchr(fdpath, '@');
+       if (p)
+               *p = '\0';
+
+       fp = fopen(fdpath, "r");
+       if (fp == NULL) {
+               if (strcmp(path, fdpath))
+                       fp = fopen(path, "r");
+               if (fp == NULL)
+                       goto fsvtyp; /* DragonFly */
+               else
+                       strlcpy(fdpath, path, sizeof(fdpath));
+       }
 
        if (ignore_type == false)
-               type_check(path, fp);
+               type_check(fdpath, fp);
 
        memset(label, '\0', sizeof(label));