Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 284 insertions, 0 deletions

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 <sys/file.h>
+
+#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;
+}