/* libguestfs - the guestfsd daemon
- * Copyright (C) 2009 Red Hat Inc.
+ * Copyright (C) 2009 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
#include <dirent.h>
#include <sys/stat.h>
+#include "c-ctype.h"
+
#include "daemon.h"
#include "actions.h"
-char **
-do_list_devices (void)
+typedef int (*block_dev_func_t)(const char *dev,
+ char ***r, int *size, int *alloc);
+
+/* Execute a given function for each discovered block device */
+static char**
+foreach_block_device (block_dev_func_t func)
{
char **r = NULL;
int size = 0, alloc = 0;
+
DIR *dir;
- struct dirent *d;
- char buf[256];
+ int err = 0;
dir = opendir ("/sys/block");
if (!dir) {
return NULL;
}
- while ((d = readdir (dir)) != NULL) {
- if (strncmp (d->d_name, "sd", 2) == 0) {
- snprintf (buf, sizeof buf, "/dev/%s", d->d_name);
- if (add_string (&r, &size, &alloc, buf) == -1) {
- closedir (dir);
- return NULL;
+ while(1) {
+ errno = 0;
+ struct dirent *d = readdir(dir);
+ if(NULL == d) break;
+
+ if (STREQLEN (d->d_name, "sd", 2) ||
+ STREQLEN (d->d_name, "hd", 2) ||
+ STREQLEN (d->d_name, "vd", 2) ||
+ STREQLEN (d->d_name, "sr", 2)) {
+ char dev_path[256];
+ snprintf (dev_path, sizeof dev_path, "/dev/%s", d->d_name);
+
+ /* Ignore the root device. */
+ if (is_root_device (dev_path))
+ continue;
+
+ /* RHBZ#514505: Some versions of qemu <= 0.10 add a
+ * CD-ROM device even though we didn't request it. Try to
+ * detect this by seeing if the device contains media.
+ */
+ int fd = open (dev_path, O_RDONLY);
+ if (fd == -1) {
+ perror (dev_path);
+ continue;
+ }
+ close (fd);
+
+ /* Call the map function for this device */
+ if((*func)(d->d_name, &r, &size, &alloc) != 0) {
+ err = 1;
+ break;
}
}
}
- if (add_string (&r, &size, &alloc, NULL) == -1) {
- closedir (dir);
+ /* Check readdir didn't fail */
+ if(0 != errno) {
+ reply_with_perror ("readdir: /sys/block");
+ free_stringslen(r, size);
return NULL;
}
+ /* Close the directory handle */
if (closedir (dir) == -1) {
reply_with_perror ("closedir: /sys/block");
- free_strings (r);
+ free_stringslen(r, size);
+ return NULL;
+ }
+
+ /* Free the result list on error */
+ if(err) {
+ free_stringslen(r, size);
+ return NULL;
+ }
+
+ /* Sort the devices */
+ sort_strings (r, size);
+
+ /* NULL terminate the list */
+ if (add_string (&r, &size, &alloc, NULL) == -1) {
return NULL;
}
- sort_strings (r, size-1);
return r;
}
+/* Add a device to the list of devices */
+static int
+add_device(const char *device,
+ char ***const r, int *const size, int *const alloc)
+{
+ char dev_path[256];
+ snprintf (dev_path, sizeof dev_path, "/dev/%s", device);
+
+ if (add_string (r, size, alloc, dev_path) == -1) {
+ return -1;
+ }
+
+ return 0;
+}
+
char **
-do_list_partitions (void)
+do_list_devices (void)
{
- char **r = NULL;
- int size = 0, alloc = 0;
- DIR *dir, *dir2;
- struct dirent *d;
- char buf[256], devname[256];
+ return foreach_block_device(add_device);
+}
- dir = opendir ("/sys/block");
+static int
+add_partitions(const char *device,
+ char ***const r, int *const size, int *const alloc)
+{
+ char devdir[256];
+
+ /* Open the device's directory under /sys/block */
+ snprintf (devdir, sizeof devdir, "/sys/block/%s", device);
+
+ DIR *dir = opendir (devdir);
if (!dir) {
- reply_with_perror ("opendir: /sys/block");
- return NULL;
+ reply_with_perror ("opendir: %s", devdir);
+ free_stringslen (*r, *size);
+ return -1;
}
+ /* Look in /sys/block/<device>/ for entries starting with <device>
+ * e.g. /sys/block/sda/sda1
+ */
+ errno = 0;
+ struct dirent *d;
while ((d = readdir (dir)) != NULL) {
- if (strncmp (d->d_name, "sd", 2) == 0) {
- strncpy (devname, d->d_name, sizeof devname);
- devname[sizeof devname - 1] = '\0';
-
- snprintf (buf, sizeof buf, "/sys/block/%s", devname);
+ if (STREQLEN (d->d_name, device, strlen (device))) {
+ char part[256];
+ snprintf (part, sizeof part, "/dev/%s", d->d_name);
- dir2 = opendir (buf);
- if (!dir2) {
- reply_with_perror ("opendir: %s", buf);
- free_stringslen (r, size);
- return NULL;
- }
- while ((d = readdir (dir2)) != NULL) {
- if (strncmp (d->d_name, devname, strlen (devname)) == 0) {
- snprintf (buf, sizeof buf, "/dev/%s", d->d_name);
-
- if (add_string (&r, &size, &alloc, buf) == -1) {
- closedir (dir2);
- closedir (dir);
- return NULL;
- }
- }
- }
-
- if (closedir (dir2) == -1) {
- reply_with_perror ("closedir: /sys/block/%s", devname);
- free_stringslen (r, size);
- return NULL;
+ if (add_string (r, size, alloc, part) == -1) {
+ closedir (dir);
+ return -1;
}
}
}
- if (add_string (&r, &size, &alloc, NULL) == -1) {
- closedir (dir);
- return NULL;
+ /* Check if readdir failed */
+ if(0 != errno) {
+ reply_with_perror ("readdir: %s", devdir);
+ free_stringslen(*r, *size);
+ return -1;
}
+ /* Close the directory handle */
if (closedir (dir) == -1) {
- reply_with_perror ("closedir: /sys/block");
- free_strings (r);
+ reply_with_perror ("closedir: /sys/block/%s", device);
+ free_stringslen (*r, *size);
+ return -1;
+ }
+
+ return 0;
+}
+
+char **
+do_list_partitions (void)
+{
+ return foreach_block_device(add_partitions);
+}
+
+char *
+do_part_to_dev (const char *part)
+{
+ int err = 1;
+ size_t n = strlen (part);
+
+ while (n >= 1 && c_isdigit (part[n-1])) {
+ err = 0;
+ n--;
+ }
+
+ if (err) {
+ reply_with_error ("device name is not a partition");
+ return NULL;
+ }
+
+ char *r = strndup (part, n);
+ if (r == NULL) {
+ reply_with_perror ("strdup");
return NULL;
}
- sort_strings (r, size-1);
return r;
}
git.annexia.org / libguestfs.git / blobdiff