[Libguestfs] [PATCH 2/3] New API: list-md-devices.
Richard W.M. Jones
rjones at redhat.com
Fri Nov 11 12:58:23 UTC 2011
From: Matthew Booth <mbooth at redhat.com>
Return a list of Linux MD devices detected in the guest.
This API complements list_devices, list_partitions, list_lvs and
list_dm_devices.
---
appliance/init | 3 ++
daemon/daemon.h | 1 +
daemon/guestfsd.c | 24 +++++++++----
daemon/md.c | 62 +++++++++++++++++++++++++++++++++++
generator/generator_actions.ml | 6 +++
regressions/Makefile.am | 1 +
regressions/test-list-md-devices.sh | 59 +++++++++++++++++++++++++++++++++
src/MAX_PROC_NR | 2 +-
8 files changed, 150 insertions(+), 8 deletions(-)
create mode 100755 regressions/test-list-md-devices.sh
diff --git a/appliance/init b/appliance/init
index ee80334..0f32a55 100755
--- a/appliance/init
+++ b/appliance/init
@@ -70,6 +70,9 @@ ifconfig lo 127.0.0.1
ifconfig eth0 169.254.2.10
route add default gw 169.254.2.2
+# Scan for MDs.
+mdadm -As --auto=yes --run
+
# Scan for LVM.
modprobe dm_mod ||:
diff --git a/daemon/daemon.h b/daemon/daemon.h
index 489c38d..69097c3 100644
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -47,6 +47,7 @@ extern int xwrite (int sock, const void *buf, size_t len)
extern int xread (int sock, void *buf, size_t len)
__attribute__((__warn_unused_result__));
+extern int add_string_nodup (char ***argv, int *size, int *alloc, char *str);
extern int add_string (char ***argv, int *size, int *alloc, const char *str);
extern size_t count_strings (char *const *argv);
extern void sort_strings (char **argv, int len);
diff --git a/daemon/guestfsd.c b/daemon/guestfsd.c
index eacbc1d..38cfd1a 100644
--- a/daemon/guestfsd.c
+++ b/daemon/guestfsd.c
@@ -415,10 +415,9 @@ xread (int sock, void *v_buf, size_t len)
}
int
-add_string (char ***argv, int *size, int *alloc, const char *str)
+add_string_nodup (char ***argv, int *size, int *alloc, char *str)
{
char **new_argv;
- char *new_str;
if (*size >= *alloc) {
*alloc += 64;
@@ -426,25 +425,36 @@ add_string (char ***argv, int *size, int *alloc, const char *str)
if (new_argv == NULL) {
reply_with_perror ("realloc");
free_strings (*argv);
+ *argv = NULL;
return -1;
}
*argv = new_argv;
}
+ (*argv)[*size] = str;
+
+ (*size)++;
+ return 0;
+}
+
+int
+add_string (char ***argv, int *size, int *alloc, const char *str)
+{
+ char *new_str;
+
if (str) {
new_str = strdup (str);
if (new_str == NULL) {
reply_with_perror ("strdup");
free_strings (*argv);
+ *argv = NULL;
return -1;
}
- } else
+ } else {
new_str = NULL;
+ }
- (*argv)[*size] = new_str;
-
- (*size)++;
- return 0;
+ return add_string_nodup (argv, size, alloc, new_str);
}
size_t
diff --git a/daemon/md.c b/daemon/md.c
index 1adb4ac..257bd0f 100644
--- a/daemon/md.c
+++ b/daemon/md.c
@@ -168,3 +168,65 @@ do_mdadm_create (const char *name, char *const *devices,
return 0;
}
+
+static int
+glob_errfunc (const char *epath, int eerrno)
+{
+ fprintf (stderr, "glob: failure reading %s: %s\n", epath, strerror (eerrno));
+ return 1;
+}
+
+char **
+do_list_md_devices (void)
+{
+ char **r = NULL;
+ int size = 0, alloc = 0;
+ glob_t mds;
+
+ memset(&mds, 0, sizeof(mds));
+
+#define PREFIX "/sys/block/md"
+#define SUFFIX "/md"
+
+ /* Look for directories under /sys/block matching md[0-9]*
+ * As an additional check, we also make sure they have a md subdirectory.
+ */
+ int err = glob (PREFIX "[0-9]*" SUFFIX, GLOB_ERR, glob_errfunc, &mds);
+ if (err == GLOB_NOSPACE) {
+ reply_with_error ("glob: returned GLOB_NOSPACE: "
+ "rerun with LIBGUESTFS_DEBUG=1");
+ goto error;
+ } else if (err == GLOB_ABORTED) {
+ reply_with_error ("glob: returned GLOB_ABORTED: "
+ "rerun with LIBGUESTFS_DEBUG=1");
+ goto error;
+ }
+
+ for (size_t i = 0; i < mds.gl_pathc; i++) {
+ size_t len = strlen (mds.gl_pathv[i]) - strlen (PREFIX) - strlen (SUFFIX);
+
+#define DEV "/dev/md"
+ char *dev = malloc (strlen(DEV) + len + 1);
+ if (NULL == dev) {
+ reply_with_perror("malloc");
+ goto error;
+ }
+
+ char *n = dev;
+ n = mempcpy(n, DEV, strlen(DEV));
+ n = mempcpy(n, &mds.gl_pathv[i][strlen(PREFIX)], len);
+ *n = '\0';
+
+ if (add_string_nodup (&r, &size, &alloc, dev) == -1) goto error;
+ }
+
+ if (add_string_nodup (&r, &size, &alloc, NULL) == -1) goto error;
+ globfree (&mds);
+
+ return r;
+
+error:
+ globfree (&mds);
+ if (r != NULL) free_strings (r);
+ return NULL;
+}
diff --git a/generator/generator_actions.ml b/generator/generator_actions.ml
index 4b18aa1..0500d54 100644
--- a/generator/generator_actions.ml
+++ b/generator/generator_actions.ml
@@ -6490,6 +6490,12 @@ If not set, this defaults to C<raid1>.
=back");
+ ("list_md_devices", (RStringList "devices", [], []), 300, [],
+ [],
+ "list Linux md (RAID) devices",
+ "\
+List all Linux md devices.");
+
]
let all_functions = non_daemon_functions @ daemon_functions
diff --git a/regressions/Makefile.am b/regressions/Makefile.am
index 5263905..f273464 100644
--- a/regressions/Makefile.am
+++ b/regressions/Makefile.am
@@ -45,6 +45,7 @@ TESTS = \
test-guestfish-tilde.sh \
test-inspect-fstab.sh \
test-launch-race.pl \
+ test-list-md-devices.sh \
test-luks.sh \
test-luks-list.sh \
test-lvm-filtering.sh \
diff --git a/regressions/test-list-md-devices.sh b/regressions/test-list-md-devices.sh
new file mode 100755
index 0000000..cd12d80
--- /dev/null
+++ b/regressions/test-list-md-devices.sh
@@ -0,0 +1,59 @@
+#!/bin/bash -
+# libguestfs
+# Copyright (C) 2011 Red Hat Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+# Test guestfish list-md-devices command
+
+set -e
+
+output=$(
+../fish/guestfish <<EOF
+# Add 2 empty disks
+sparse md-test1.img 100M
+sparse md-test2.img 100M
+run
+
+# list-md-devices should return nothing
+list-md-devices
+
+# Create a raid1 based on the 2 disks
+mdadm-create test "/dev/sda /dev/sdb" level:raid1
+EOF
+)
+
+# Ensure list-md-devices above returned nothing
+if [ ! -z "$output" ]; then
+ echo "$0: error: output of list-md-devices with no MD devices did not match expected output"
+ echo $output
+ exit 1;
+fi
+
+# Ensure list-md-devices now returns the newly created md device
+output=$(
+../fish/guestfish -a md-test1.img -a md-test2.img <<EOF
+run
+list-md-devices
+EOF
+)
+
+if [ "$output" != "/dev/md127" ]; then
+ echo "$0: error: output of list-md-devices did not match expected output"
+ echo "$output"
+ exit 1
+fi
+
+rm -f md-test1.img md-test2.img
diff --git a/src/MAX_PROC_NR b/src/MAX_PROC_NR
index 03a5b41..697cb3a 100644
--- a/src/MAX_PROC_NR
+++ b/src/MAX_PROC_NR
@@ -1 +1 @@
-299
+300
--
1.7.6
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