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dissect: automatically detect boot loader spec $BOOT partition

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The boot loader spec supports two places to store boot loader
configuration: the ESP and a generic replacement for it in case the ESP
is not available or not suitable. Let's look for both.
This commit is contained in:
Lennart Poettering 2019-01-23 11:34:31 +01:00
parent 7b5de29569
commit a8c47660bb
2 changed files with 54 additions and 12 deletions
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65
src/shared/dissect-image.c
View File

@ -495,6 +495,14 @@ int dissect_image(
designator = PARTITION_ESP;
fstype = "vfat";
} else if (sd_id128_equal(type_id, GPT_XBOOTLDR)) {
if (pflags & GPT_FLAG_NO_AUTO)
continue;
designator = PARTITION_XBOOTLDR;
rw = !(pflags & GPT_FLAG_READ_ONLY);
}
#ifdef GPT_ROOT_NATIVE
else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) {
@ -610,21 +618,53 @@ int dissect_image(
} else if (is_mbr) {
if (pflags != 0x80) /* Bootable flag */
continue;
switch (blkid_partition_get_type(pp)) {
if (blkid_partition_get_type(pp) != 0x83) /* Linux partition */
continue;
case 0x83: /* Linux partition */
if (generic_node)
multiple_generic = true;
else {
generic_nr = nr;
generic_rw = true;
generic_node = strdup(node);
if (!generic_node)
if (pflags != 0x80) /* Bootable flag */
continue;
if (generic_node)
multiple_generic = true;
else {
generic_nr = nr;
generic_rw = true;
generic_node = strdup(node);
if (!generic_node)
return -ENOMEM;
}
break;
case 0xEA: { /* Boot Loader Spec extended $BOOT partition */
_cleanup_free_ char *n = NULL;
sd_id128_t id = SD_ID128_NULL;
const char *sid;
/* First one wins */
if (m->partitions[PARTITION_XBOOTLDR].found)
continue;
sid = blkid_partition_get_uuid(pp);
if (sid)
(void) sd_id128_from_string(sid, &id);
n = strdup(node);
if (!n)
return -ENOMEM;
}
m->partitions[PARTITION_XBOOTLDR] = (DissectedPartition) {
.found = true,
.partno = nr,
.rw = true,
.architecture = _ARCHITECTURE_INVALID,
.node = TAKE_PTR(n),
.uuid = id,
};
break;
}}
}
}
@ -1497,6 +1537,7 @@ static const char *const partition_designator_table[] = {
[PARTITION_HOME] = "home",
[PARTITION_SRV] = "srv",
[PARTITION_ESP] = "esp",
[PARTITION_XBOOTLDR] = "xbootldr",
[PARTITION_SWAP] = "swap",
[PARTITION_ROOT_VERITY] = "root-verity",
[PARTITION_ROOT_SECONDARY_VERITY] = "root-secondary-verity",

1
src/shared/dissect-image.h
View File

@ -29,6 +29,7 @@ enum {
PARTITION_HOME,
PARTITION_SRV,
PARTITION_ESP,
PARTITION_XBOOTLDR,
PARTITION_SWAP,
PARTITION_ROOT_VERITY, /* verity data for the PARTITION_ROOT partition */
PARTITION_ROOT_SECONDARY_VERITY, /* verity data for the PARTITION_ROOT_SECONDARY partition */