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udev: automatically create a symlink /dev/disk/by-id/gpt-auto-root if there's a suitable root partition

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This commit is contained in:
Lennart Poettering 2014-03-07 03:30:30 +01:00
parent 5ecdcf41cb
commit 329f7803ee
2 changed files with 16 additions and 2 deletions
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3
rules/60-persistent-storage.rules
View File

@ -84,4 +84,7 @@ ENV{DEVTYPE}=="partition", ENV{ID_WWN_WITH_EXTENSION}=="?*", SYMLINK+="disk/by-i
ENV{ID_PART_ENTRY_SCHEME}=="gpt", ENV{ID_PART_ENTRY_UUID}=="?*", SYMLINK+="disk/by-partuuid/$env{ID_PART_ENTRY_UUID}"
ENV{ID_PART_ENTRY_SCHEME}=="gpt", ENV{ID_PART_ENTRY_NAME}=="?*", SYMLINK+="disk/by-partlabel/$env{ID_PART_ENTRY_NAME}"
# add symlink to GPT root disk
ENV{ID_PART_ENTRY_SCHEME}=="gpt", ENV{ID_PART_GPT_AUTO_ROOT}=="1", SYMLINK+="disk/by-id/gpt-auto-root"
LABEL="persistent_storage_end"

15
src/udev/udev-builtin-blkid.c
View File

@ -174,9 +174,9 @@ static int find_gpt_root(struct udev_device *dev, blkid_probe pr, bool test) {
}
/* We found the ESP on this disk, and also found a root
* partition, nice! Let's export its UUID*/
* partition, nice! Let's export its UUID */
if (found_esp && root_id)
udev_builtin_add_property(dev, test, "ID_PART_GPT_AUTO_ROOT", root_id);
udev_builtin_add_property(dev, test, "ID_PART_GPT_AUTO_ROOT_UUID", root_id);
#endif
return 0;
@ -217,6 +217,7 @@ static int probe_superblocks(blkid_probe pr)
static int builtin_blkid(struct udev_device *dev, int argc, char *argv[], bool test)
{
const char *root_partition;
int64_t offset = 0;
bool noraid = false;
_cleanup_close_ int fd = -1;
@ -282,6 +283,10 @@ static int builtin_blkid(struct udev_device *dev, int argc, char *argv[], bool t
if (err < 0)
goto out;
/* If we are a partition then our parent passed on the root
* partition UUID to us */
root_partition = udev_device_get_property_value(dev, "ID_PART_GPT_AUTO_ROOT_UUID");
nvals = blkid_probe_numof_values(pr);
for (i = 0; i < nvals; i++) {
if (blkid_probe_get_value(pr, i, &name, &data, &len))
@ -290,8 +295,14 @@ static int builtin_blkid(struct udev_device *dev, int argc, char *argv[], bool t
len = strnlen((char *) data, len);
print_property(dev, test, name, (char *) data);
/* Is this a disk with GPT partition table? */
if (streq(name, "PTTYPE") && streq(data, "gpt"))
is_gpt = true;
/* Is this a partition that matches the root partition
* property we inherited from our parent? */
if (root_partition && streq(name, "PART_ENTRY_UUID") && streq(data, root_partition))
udev_builtin_add_property(dev, test, "ID_PART_GPT_AUTO_ROOT", "1");
}
if (is_gpt)