From 55944e5e40b1be2afc4855d8d2baf4b73d1876b5 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 10 Apr 2024 22:49:52 +0200 Subject: Adding upstream version 255.4. Signed-off-by: Daniel Baumann --- src/sysupdate/sysupdate-partition.c | 284 ++++++++++++++++++++++++++++++++++++ 1 file changed, 284 insertions(+) create mode 100644 src/sysupdate/sysupdate-partition.c (limited to 'src/sysupdate/sysupdate-partition.c') diff --git a/src/sysupdate/sysupdate-partition.c b/src/sysupdate/sysupdate-partition.c new file mode 100644 index 0000000..6f8e072 --- /dev/null +++ b/src/sysupdate/sysupdate-partition.c @@ -0,0 +1,284 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include + +#include "alloc-util.h" +#include "extract-word.h" +#include "gpt.h" +#include "id128-util.h" +#include "parse-util.h" +#include "stdio-util.h" +#include "string-util.h" +#include "sysupdate-partition.h" + +void partition_info_destroy(PartitionInfo *p) { + assert(p); + + p->label = mfree(p->label); + p->device = mfree(p->device); +} + +int read_partition_info( + struct fdisk_context *c, + struct fdisk_table *t, + size_t i, + PartitionInfo *ret) { + + _cleanup_free_ char *label_copy = NULL, *device = NULL; + const char *label; + struct fdisk_partition *p; + uint64_t start, size, flags; + unsigned long ssz; + sd_id128_t ptid, id; + GptPartitionType type; + size_t partno; + int r; + + assert(c); + assert(t); + assert(ret); + + p = fdisk_table_get_partition(t, i); + if (!p) + return log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to read partition metadata: %m"); + + if (fdisk_partition_is_used(p) <= 0) { + *ret = (PartitionInfo) PARTITION_INFO_NULL; + return 0; /* not found! */ + } + + if (fdisk_partition_has_partno(p) <= 0 || + fdisk_partition_has_start(p) <= 0 || + fdisk_partition_has_size(p) <= 0) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Found a partition without a number, position or size."); + + partno = fdisk_partition_get_partno(p); + + start = fdisk_partition_get_start(p); + ssz = fdisk_get_sector_size(c); + assert(start <= UINT64_MAX / ssz); + start *= ssz; + + size = fdisk_partition_get_size(p); + assert(size <= UINT64_MAX / ssz); + size *= ssz; + + label = fdisk_partition_get_name(p); + if (!label) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Found a partition without a label."); + + r = fdisk_partition_get_type_as_id128(p, &ptid); + if (r < 0) + return log_error_errno(r, "Failed to read partition type UUID: %m"); + + r = fdisk_partition_get_uuid_as_id128(p, &id); + if (r < 0) + return log_error_errno(r, "Failed to read partition UUID: %m"); + + r = fdisk_partition_get_attrs_as_uint64(p, &flags); + if (r < 0) + return log_error_errno(r, "Failed to get partition flags: %m"); + + r = fdisk_partition_to_string(p, c, FDISK_FIELD_DEVICE, &device); + if (r != 0) + return log_error_errno(r, "Failed to get partition device name: %m"); + + label_copy = strdup(label); + if (!label_copy) + return log_oom(); + + type = gpt_partition_type_from_uuid(ptid); + + *ret = (PartitionInfo) { + .partno = partno, + .start = start, + .size = size, + .flags = flags, + .type = ptid, + .uuid = id, + .label = TAKE_PTR(label_copy), + .device = TAKE_PTR(device), + .no_auto = FLAGS_SET(flags, SD_GPT_FLAG_NO_AUTO) && gpt_partition_type_knows_no_auto(type), + .read_only = FLAGS_SET(flags, SD_GPT_FLAG_READ_ONLY) && gpt_partition_type_knows_read_only(type), + .growfs = FLAGS_SET(flags, SD_GPT_FLAG_GROWFS) && gpt_partition_type_knows_growfs(type), + }; + + return 1; /* found! */ +} + +int find_suitable_partition( + const char *device, + uint64_t space, + sd_id128_t *partition_type, + PartitionInfo *ret) { + + _cleanup_(partition_info_destroy) PartitionInfo smallest = PARTITION_INFO_NULL; + _cleanup_(fdisk_unref_contextp) struct fdisk_context *c = NULL; + _cleanup_(fdisk_unref_tablep) struct fdisk_table *t = NULL; + size_t n_partitions; + int r; + + assert(device); + assert(ret); + + r = fdisk_new_context_at(AT_FDCWD, device, /* read_only= */ true, /* sector_size= */ UINT32_MAX, &c); + if (r < 0) + return log_error_errno(r, "Failed to create fdisk context from '%s': %m", device); + + if (!fdisk_is_labeltype(c, FDISK_DISKLABEL_GPT)) + return log_error_errno(SYNTHETIC_ERRNO(EHWPOISON), "Disk %s has no GPT disk label, not suitable.", device); + + r = fdisk_get_partitions(c, &t); + if (r < 0) + return log_error_errno(r, "Failed to acquire partition table: %m"); + + n_partitions = fdisk_table_get_nents(t); + for (size_t i = 0; i < n_partitions; i++) { + _cleanup_(partition_info_destroy) PartitionInfo pinfo = PARTITION_INFO_NULL; + + r = read_partition_info(c, t, i, &pinfo); + if (r < 0) + return r; + if (r == 0) /* not assigned */ + continue; + + /* Filter out non-matching partition types */ + if (partition_type && !sd_id128_equal(pinfo.type, *partition_type)) + continue; + + if (!streq_ptr(pinfo.label, "_empty")) /* used */ + continue; + + if (space != UINT64_MAX && pinfo.size < space) /* too small */ + continue; + + if (smallest.partno != SIZE_MAX && smallest.size <= pinfo.size) /* already found smaller */ + continue; + + smallest = pinfo; + pinfo = (PartitionInfo) PARTITION_INFO_NULL; + } + + if (smallest.partno == SIZE_MAX) + return log_error_errno(SYNTHETIC_ERRNO(ENOSPC), "No available partition of a suitable size found."); + + *ret = smallest; + smallest = (PartitionInfo) PARTITION_INFO_NULL; + + return 0; +} + +int patch_partition( + const char *device, + const PartitionInfo *info, + PartitionChange change) { + + _cleanup_(fdisk_unref_partitionp) struct fdisk_partition *pa = NULL; + _cleanup_(fdisk_unref_contextp) struct fdisk_context *c = NULL; + bool tweak_no_auto, tweak_read_only, tweak_growfs; + GptPartitionType type; + int r, fd; + + assert(device); + assert(info); + assert(change <= _PARTITION_CHANGE_MAX); + + if (change == 0) /* Nothing to do */ + return 0; + + r = fdisk_new_context_at(AT_FDCWD, device, /* read_only= */ false, /* sector_size= */ UINT32_MAX, &c); + if (r < 0) + return log_error_errno(r, "Failed to create fdisk context from '%s': %m", device); + + assert_se((fd = fdisk_get_devfd(c)) >= 0); + + /* Make sure udev doesn't read the device while we make changes (this lock is released automatically + * by the kernel when the fd is closed, i.e. when the fdisk context is freed, hence no explicit + * unlock by us here anywhere.) */ + if (flock(fd, LOCK_EX) < 0) + return log_error_errno(errno, "Failed to lock block device '%s': %m", device); + + if (!fdisk_is_labeltype(c, FDISK_DISKLABEL_GPT)) + return log_error_errno(SYNTHETIC_ERRNO(EHWPOISON), "Disk %s has no GPT disk label, not suitable.", device); + + r = fdisk_get_partition(c, info->partno, &pa); + if (r < 0) + return log_error_errno(r, "Failed to read partition %zu of GPT label of '%s': %m", info->partno, device); + + if (change & PARTITION_LABEL) { + r = fdisk_partition_set_name(pa, info->label); + if (r < 0) + return log_error_errno(r, "Failed to update partition label: %m"); + } + + if (change & PARTITION_UUID) { + r = fdisk_partition_set_uuid(pa, SD_ID128_TO_UUID_STRING(info->uuid)); + if (r < 0) + return log_error_errno(r, "Failed to update partition UUID: %m"); + } + + type = gpt_partition_type_from_uuid(info->type); + + /* Tweak the read-only flag, but only if supported by the partition type */ + tweak_no_auto = + FLAGS_SET(change, PARTITION_NO_AUTO) && + gpt_partition_type_knows_no_auto(type); + tweak_read_only = + FLAGS_SET(change, PARTITION_READ_ONLY) && + gpt_partition_type_knows_read_only(type); + tweak_growfs = + FLAGS_SET(change, PARTITION_GROWFS) && + gpt_partition_type_knows_growfs(type); + + if (change & PARTITION_FLAGS) { + uint64_t flags; + + /* Update the full flags parameter, and import the read-only flag into it */ + + flags = info->flags; + if (tweak_no_auto) + SET_FLAG(flags, SD_GPT_FLAG_NO_AUTO, info->no_auto); + if (tweak_read_only) + SET_FLAG(flags, SD_GPT_FLAG_READ_ONLY, info->read_only); + if (tweak_growfs) + SET_FLAG(flags, SD_GPT_FLAG_GROWFS, info->growfs); + + r = fdisk_partition_set_attrs_as_uint64(pa, flags); + if (r < 0) + return log_error_errno(r, "Failed to update partition flags: %m"); + + } else if (tweak_no_auto || tweak_read_only || tweak_growfs) { + uint64_t old_flags, new_flags; + + /* So we aren't supposed to update the full flags parameter, but we are supposed to update + * the RO flag of it. */ + + r = fdisk_partition_get_attrs_as_uint64(pa, &old_flags); + if (r < 0) + return log_error_errno(r, "Failed to get old partition flags: %m"); + + new_flags = old_flags; + if (tweak_no_auto) + SET_FLAG(new_flags, SD_GPT_FLAG_NO_AUTO, info->no_auto); + if (tweak_read_only) + SET_FLAG(new_flags, SD_GPT_FLAG_READ_ONLY, info->read_only); + if (tweak_growfs) + SET_FLAG(new_flags, SD_GPT_FLAG_GROWFS, info->growfs); + + if (new_flags != old_flags) { + r = fdisk_partition_set_attrs_as_uint64(pa, new_flags); + if (r < 0) + return log_error_errno(r, "Failed to update partition flags: %m"); + } + } + + r = fdisk_set_partition(c, info->partno, pa); + if (r < 0) + return log_error_errno(r, "Failed to update partition: %m"); + + r = fdisk_write_disklabel(c); + if (r < 0) + return log_error_errno(r, "Failed to write updated partition table: %m"); + + return 0; +} -- cgit v1.2.3