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zdev: Implement internal device attributes

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This change adds base infrastructure for implementing internal device
attributes. In the context of the zdev tools, an internal device
attribute is a new type of device attribute with the following
characteristics:

  - Can be set and removed like normal device attributes
  - Affects zdev-internal handling only
  - Does not correspond to an actual device attribute, that is
    it has no representation in SysFS
  - Can not be set in the active configuration
  - Name starts with "zdev:" to prevent conflicts with actual
    device attributes

Values for internal device attributes are stored in udev rules alongside
the normal persistent configuration of a device. They are encoded as
udev environment variables. Note that they have no further effect on
udev processing.

Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Peter Oberparleiter
2017-09-01 11:05:58 +02:00
committed by Jan Höppner
parent 3c5644ccfd
commit c0392efa39
12 changed files with 220 additions and 8 deletions
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32
zdev/src/udev.c
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@@ -409,3 +409,35 @@ void udev_settle(void)
return;
misc_system(err_ignore, "%s settle", PATH_UDEVADM);
}
/* Extract internal attribute settings from @entry and add to @list.
* Associate corresponding attribute if found in @attribs. */
void udev_add_internal_from_entry(struct setting_list *list,
struct udev_entry_node *entry,
struct attrib **attribs)
{
char *copy, *name, *end, *u;
struct attrib *a;
/* ENV{zdev_var}="1" */
copy = misc_strdup(entry->key);
/* Find attribute name start. */
name = strchr(copy, '{');
end = strrchr(copy, '}');
if (!name || !end)
goto out;
*end = 0;
name++;
/* zdev_ => zdev: */
u = strchr(name, '_');
if (u)
*u = ':';
a = attrib_find(attribs, name);
setting_list_apply_actual(list, a, name, entry->value);
out:
free(copy);
}