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Add DM_DEFAULT_NAME_MANGLING_MODE env. variable to override configured value.

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Just in case of emergency when name mangling code causes any problems so
we can override the default value and switch off the mangling globally.
This commit is contained in:
Peter Rajnoha 2012-02-15 12:23:15 +00:00
parent 3eb23ab3d2
commit 05bfdefdf8
4 changed files with 29 additions and 1 deletions
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2
WHATS_NEW_DM
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@ -1,5 +1,7 @@
Version 1.02.71 -
====================================
Add DM_DEFAULT_NAME_MANGLING_MODE env. variable to override configured value.
Add dm_lib_init to automatically initialise device-mapper library on load.
Replace any '\' char with '\\' in table specification on input.
Add mangle command to dmsetup to provide renaming to correct mangled form.
Add 'mangled_name' and 'unmangled_name' fields to dmsetup info -c -o.

6
libdm/libdevmapper.h
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@ -365,6 +365,12 @@ int dm_device_has_holders(uint32_t major, uint32_t minor);
*/
int dm_device_has_mounted_fs(uint32_t major, uint32_t minor);
/*
* Initialise library
*/
void dm_lib_init(void) __attribute__((constructor));
/*
* Release library resources
*/

20
libdm/libdm-common.c
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@ -43,6 +43,8 @@
# include <selinux/label.h>
#endif
#define DM_DEFAULT_NAME_MANGLING_MODE_ENV_VAR_NAME "DM_DEFAULT_NAME_MANGLING_MODE"
#define DEV_DIR "/dev/"
#ifdef UDEV_SYNC_SUPPORT
@ -66,7 +68,7 @@ static char _default_uuid_prefix[DM_MAX_UUID_PREFIX_LEN + 1] = "LVM-";
static int _verbose = 0;
static int _suspended_dev_counter = 0;
static int _name_mangling_mode = DEFAULT_DM_NAME_MANGLING;
static int _name_mangling_mode = -1;
#ifdef HAVE_SELINUX_LABEL_H
static struct selabel_handle *_selabel_handle = NULL;
@ -79,6 +81,22 @@ static int _sync_with_udev = 1;
static int _udev_checking = 1;
#endif
void dm_lib_init(void)
{
const char *env;
env = getenv(DM_DEFAULT_NAME_MANGLING_MODE_ENV_VAR_NAME);
if (env && *env) {
if (!strcasecmp(env, "none"))
_name_mangling_mode = DM_STRING_MANGLING_NONE;
else if (!strcasecmp(env, "auto"))
_name_mangling_mode = DM_STRING_MANGLING_AUTO;
else if (!strcasecmp(env, "hex"))
_name_mangling_mode = DM_STRING_MANGLING_HEX;
} else
_name_mangling_mode = DEFAULT_DM_NAME_MANGLING;
}
/*
* Library users can provide their own logging
* function.

2
libdm/libdm-common.h
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@ -18,6 +18,8 @@
#include "libdevmapper.h"
#define DM_DEFAULT_NAME_MANGLING_MODE_ENV_VAR_NAME "DM_DEFAULT_NAME_MANGLING_MODE"
#define DEV_NAME(dmt) (dmt->mangled_dev_name ? : dmt->dev_name)
int mangle_name(const char *str, size_t len, char *buf,