>Number: 146254
>Category: bin
>Synopsis: [PATCH][mdmfs] Add -k option to specify a skeldir
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Sun May 02 21:20:07 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator: Jeremie Le Hen
>Release: FreeBSD 9.0-CURRENT
>Organization:
None
>Environment:
System: FreeBSD felucia.tataz.chchile.org 9.0-CURRENT
>Description:
mdmfs(8) lacks the ability to populate throwaway memory filesystems
from an existing directory.
This features permits an interesting setup where /var for instance
lives on a device where wear-leveling is something you want to
avoid as much as possible and nonetheless you don't want to lose
your logs, ports metadata, etc. Here are the steps:
1) Copy /var to /var.bak;
2) Mount an mfs into /var using -k /var.bak at startup;
3) Synchronize /var to /var.bak weekly and on shutdown.
Note that this more or less mimics OpenBSD's mount_mfs(8) -P flag.
By the way I have got this neat idea on the following webpage which
explains how to set up OpenBSD on a Soekris:
http://techblagh.blogspot.com/2008/08/installing-openbsd-43-on-soekris-5501.html
--- mdmfs-k.diff begins here ---
Index: mdmfs.8
===================================================================
RCS file: /mnt/repos/freebsd-cvsroot/src/sbin/mdmfs/mdmfs.8,v
retrieving revision 1.22
diff -u -p -u -r1.22 mdmfs.8
--- mdmfs.8 16 Feb 2006 21:28:54 -0000 1.22
+++ mdmfs.8 2 May 2010 20:43:06 -0000
@@ -46,6 +46,7 @@ driver
.Op Fl F Ar file
.Op Fl f Ar frag-size
.Op Fl i Ar bytes
+.Op Fl k Ar skel
.Op Fl m Ar percent-free
.Op Fl n Ar rotational-positions
.Op Fl O Ar optimization
@@ -170,6 +171,11 @@ memory disk backed by
The fragment size of the file system in bytes.
.It Fl i Ar bytes
Number of bytes per inode.
+.It Fl k Ar skel
+Copy the content of directory
+.Ar skel
+into
+.Ar mount-point .
.It Fl l
Enable multilabel MAC on the new file system.
.It Fl L
Index: mdmfs.c
===================================================================
RCS file: /mnt/repos/freebsd-cvsroot/src/sbin/mdmfs/mdmfs.c,v
retrieving revision 1.27
diff -u -p -u -r1.27 mdmfs.c
--- mdmfs.c 16 Feb 2006 21:28:54 -0000 1.27
+++ mdmfs.c 2 May 2010 20:50:03 -0000
@@ -78,6 +78,7 @@ static void do_mdconfig_detach(void);
static void do_mount(const char *, const char *);
static void do_mtptsetup(const char *, struct mtpt_info *);
static void do_newfs(const char *);
+static void do_copy(const char *, const char *);
static void extract_ugid(const char *, struct mtpt_info *);
static int run(int *, const char *, ...) __printflike(2, 3);
static void usage(void);
@@ -91,7 +92,7 @@ main(int argc, char **argv)
enum md_types mdtype; /* The type of our memory disk. */
bool have_mdtype;
bool detach, softdep, autounit, newfs;
- char *mtpoint, *unitstr;
+ char *mtpoint, *unitstr, *skel;
char *p;
int ch;
void *set;
@@ -104,6 +105,7 @@ main(int argc, char **argv)
autounit = false;
newfs = true;
have_mdtype = false;
+ skel = NULL;
mdtype = MD_SWAP;
mdname = MD_NAME;
mdnamelen = strlen(mdname);
@@ -123,7 +125,7 @@ main(int argc, char **argv)
compat = true;
while ((ch = getopt(argc, argv,
- "a:b:Cc:Dd:E:e:F:f:hi:LlMm:Nn:O:o:Pp:Ss:t:Uv:w:X")) != -1)
+ "a:b:Cc:Dd:E:e:F:f:hi:k:LlMm:Nn:O:o:Pp:Ss:t:Uv:w:X")) != -1)
switch (ch) {
case 'a':
argappend(&newfs_arg, "-a %s", optarg);
@@ -169,6 +171,9 @@ main(int argc, char **argv)
case 'i':
argappend(&newfs_arg, "-i %s", optarg);
break;
+ case 'k':
+ skel = optarg;
+ break;
case 'L':
if (compat)
usage();
@@ -287,6 +292,8 @@ main(int argc, char **argv)
do_newfs(newfs_arg);
do_mount(mount_arg, mtpoint);
do_mtptsetup(mtpoint, &mi);
+ if (skel)
+ do_copy(mtpoint, skel);
return (0);
}
@@ -501,6 +508,23 @@ do_newfs(const char *args)
errx(1, "newfs exited with error code %d", rv);
}
+
+/*
+ * Copy skel into the mountpoint.
+ */
+static void
+do_copy(const char *mtpoint, const char *skel)
+{
+ int rv;
+
+ rv = chdir(skel);
+ if (rv)
+ err(1, "chdir to %s", skel);
+ rv = run(NULL, "/bin/pax -rw -pe . %s", mtpoint);
+ if (rv)
+ errx(1, "skel copy failed");
+}
+
/*
* 'str' should be a user and group name similar to the last argument
* to chown(1); i.e., a user, followed by a colon, followed by a
@@ -681,9 +705,9 @@ usage(void)
fprintf(stderr,
"usage: %s [-DLlMNPSUX] [-a maxcontig] [-b block-size] [-c cylinders]\n"
"\t[-d rotdelay] [-E path-mdconfig] [-e maxbpg] [-F file] [-f frag-size]\n"
-"\t[-i bytes] [-m percent-free] [-n rotational-positions] [-O optimization]\n"
-"\t[-o mount-options] [-p permissions] [-s size] [-v version]\n"
-"\t[-w user:group] md-device mount-point\n", name);
+"\t[-i bytes] [-k skel] [-m percent-free] [-n rotational-positions]\n"
+"\t[-O optimization] [-o mount-options] [-p permissions] [-s size]\n"
+"\t[-v version] [-w user:group] md-device mount-point\n", name);
fprintf(stderr,
"usage: %s -C [-lNU] [-a maxcontig] [-b block-size] [-c cylinders]\n"
"\t[-d rotdelay] [-E path-mdconfig] [-e maxbpg] [-F file] [-f frag-size]\n"
--- mdmfs-k.diff ends here ---
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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