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-rw-r--r--src/sysupdate/sysupdate-transfer.c1243
1 files changed, 1243 insertions, 0 deletions
diff --git a/src/sysupdate/sysupdate-transfer.c b/src/sysupdate/sysupdate-transfer.c
new file mode 100644
index 0000000..d6705cd
--- /dev/null
+++ b/src/sysupdate/sysupdate-transfer.c
@@ -0,0 +1,1243 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "sd-id128.h"
+
+#include "alloc-util.h"
+#include "blockdev-util.h"
+#include "chase-symlinks.h"
+#include "conf-parser.h"
+#include "dirent-util.h"
+#include "fd-util.h"
+#include "glyph-util.h"
+#include "gpt.h"
+#include "hexdecoct.h"
+#include "install-file.h"
+#include "parse-helpers.h"
+#include "parse-util.h"
+#include "process-util.h"
+#include "rm-rf.h"
+#include "specifier.h"
+#include "stat-util.h"
+#include "stdio-util.h"
+#include "strv.h"
+#include "sync-util.h"
+#include "sysupdate-pattern.h"
+#include "sysupdate-resource.h"
+#include "sysupdate-transfer.h"
+#include "sysupdate-util.h"
+#include "sysupdate.h"
+#include "tmpfile-util.h"
+#include "web-util.h"
+
+/* Default value for InstancesMax= for fs object targets */
+#define DEFAULT_FILE_INSTANCES_MAX 3
+
+Transfer *transfer_free(Transfer *t) {
+ if (!t)
+ return NULL;
+
+ t->temporary_path = rm_rf_subvolume_and_free(t->temporary_path);
+
+ free(t->definition_path);
+ free(t->min_version);
+ strv_free(t->protected_versions);
+ free(t->current_symlink);
+ free(t->final_path);
+
+ partition_info_destroy(&t->partition_info);
+
+ resource_destroy(&t->source);
+ resource_destroy(&t->target);
+
+ return mfree(t);
+}
+
+Transfer *transfer_new(void) {
+ Transfer *t;
+
+ t = new(Transfer, 1);
+ if (!t)
+ return NULL;
+
+ *t = (Transfer) {
+ .source.type = _RESOURCE_TYPE_INVALID,
+ .target.type = _RESOURCE_TYPE_INVALID,
+ .remove_temporary = true,
+ .mode = MODE_INVALID,
+ .tries_left = UINT64_MAX,
+ .tries_done = UINT64_MAX,
+ .verify = true,
+
+ /* the three flags, as configured by the user */
+ .no_auto = -1,
+ .read_only = -1,
+ .growfs = -1,
+
+ /* the read only flag, as ultimately determined */
+ .install_read_only = -1,
+
+ .partition_info = PARTITION_INFO_NULL,
+ };
+
+ return t;
+}
+
+static const Specifier specifier_table[] = {
+ COMMON_SYSTEM_SPECIFIERS,
+ COMMON_TMP_SPECIFIERS,
+ {}
+};
+
+static int config_parse_protect_version(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ _cleanup_free_ char *resolved = NULL;
+ char ***protected_versions = ASSERT_PTR(data);
+ int r;
+
+ assert(rvalue);
+
+ r = specifier_printf(rvalue, NAME_MAX, specifier_table, arg_root, NULL, &resolved);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to expand specifiers in ProtectVersion=, ignoring: %s", rvalue);
+ return 0;
+ }
+
+ if (!version_is_valid(resolved)) {
+ log_syntax(unit, LOG_WARNING, filename, line, 0,
+ "ProtectVersion= string is not valid, ignoring: %s", resolved);
+ return 0;
+ }
+
+ r = strv_extend(protected_versions, resolved);
+ if (r < 0)
+ return log_oom();
+
+ return 0;
+}
+
+static int config_parse_min_version(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ _cleanup_free_ char *resolved = NULL;
+ char **version = ASSERT_PTR(data);
+ int r;
+
+ assert(rvalue);
+
+ r = specifier_printf(rvalue, NAME_MAX, specifier_table, arg_root, NULL, &resolved);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to expand specifiers in MinVersion=, ignoring: %s", rvalue);
+ return 0;
+ }
+
+ if (!version_is_valid(rvalue)) {
+ log_syntax(unit, LOG_WARNING, filename, line, 0,
+ "MinVersion= string is not valid, ignoring: %s", resolved);
+ return 0;
+ }
+
+ return free_and_replace(*version, resolved);
+}
+
+static int config_parse_current_symlink(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ _cleanup_free_ char *resolved = NULL;
+ char **current_symlink = ASSERT_PTR(data);
+ int r;
+
+ assert(rvalue);
+
+ r = specifier_printf(rvalue, NAME_MAX, specifier_table, arg_root, NULL, &resolved);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to expand specifiers in CurrentSymlink=, ignoring: %s", rvalue);
+ return 0;
+ }
+
+ r = path_simplify_and_warn(resolved, 0, unit, filename, line, lvalue);
+ if (r < 0)
+ return 0;
+
+ return free_and_replace(*current_symlink, resolved);
+}
+
+static int config_parse_instances_max(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ uint64_t *instances_max = data, i;
+ int r;
+
+ assert(rvalue);
+ assert(data);
+
+ if (isempty(rvalue)) {
+ *instances_max = 0; /* Revert to default logic, see transfer_read_definition() */
+ return 0;
+ }
+
+ r = safe_atou64(rvalue, &i);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to parse InstancesMax= value, ignoring: %s", rvalue);
+ return 0;
+ }
+
+ if (i < 2) {
+ log_syntax(unit, LOG_WARNING, filename, line, 0,
+ "InstancesMax= value must be at least 2, bumping: %s", rvalue);
+ *instances_max = 2;
+ } else
+ *instances_max = i;
+
+ return 0;
+}
+
+static int config_parse_resource_pattern(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ char ***patterns = ASSERT_PTR(data);
+ int r;
+
+ assert(rvalue);
+
+ if (isempty(rvalue)) {
+ *patterns = strv_free(*patterns);
+ return 0;
+ }
+
+ for (;;) {
+ _cleanup_free_ char *word = NULL, *resolved = NULL;
+
+ r = extract_first_word(&rvalue, &word, NULL, EXTRACT_CUNESCAPE|EXTRACT_UNESCAPE_RELAX);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to extract first pattern from MatchPattern=, ignoring: %s", rvalue);
+ return 0;
+ }
+ if (r == 0)
+ break;
+
+ r = specifier_printf(word, NAME_MAX, specifier_table, arg_root, NULL, &resolved);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to expand specifiers in MatchPattern=, ignoring: %s", rvalue);
+ return 0;
+ }
+
+ if (!pattern_valid(resolved))
+ return log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL),
+ "MatchPattern= string is not valid, refusing: %s", resolved);
+
+ r = strv_consume(patterns, TAKE_PTR(resolved));
+ if (r < 0)
+ return log_oom();
+ }
+
+ strv_uniq(*patterns);
+ return 0;
+}
+
+static int config_parse_resource_path(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ _cleanup_free_ char *resolved = NULL;
+ Resource *rr = ASSERT_PTR(data);
+ int r;
+
+ assert(rvalue);
+
+ if (streq(rvalue, "auto")) {
+ rr->path_auto = true;
+ rr->path = mfree(rr->path);
+ return 0;
+ }
+
+ r = specifier_printf(rvalue, PATH_MAX-1, specifier_table, arg_root, NULL, &resolved);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to expand specifiers in Path=, ignoring: %s", rvalue);
+ return 0;
+ }
+
+ /* Note that we don't validate the path as being absolute or normalized. We'll do that in
+ * transfer_read_definition() as we might not know yet whether Path refers to an URL or a file system
+ * path. */
+
+ rr->path_auto = false;
+ return free_and_replace(rr->path, resolved);
+}
+
+static DEFINE_CONFIG_PARSE_ENUM(config_parse_resource_type, resource_type, ResourceType, "Invalid resource type");
+
+static int config_parse_resource_ptype(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ Resource *rr = ASSERT_PTR(data);
+ int r;
+
+ assert(rvalue);
+
+ r = gpt_partition_type_uuid_from_string(rvalue, &rr->partition_type);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed parse partition type, ignoring: %s", rvalue);
+ return 0;
+ }
+
+ rr->partition_type_set = true;
+ return 0;
+}
+
+static int config_parse_partition_uuid(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ Transfer *t = ASSERT_PTR(data);
+ int r;
+
+ assert(rvalue);
+
+ r = sd_id128_from_string(rvalue, &t->partition_uuid);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed parse partition UUID, ignoring: %s", rvalue);
+ return 0;
+ }
+
+ t->partition_uuid_set = true;
+ return 0;
+}
+
+static int config_parse_partition_flags(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ Transfer *t = ASSERT_PTR(data);
+ int r;
+
+ assert(rvalue);
+
+ r = safe_atou64(rvalue, &t->partition_flags);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed parse partition flags, ignoring: %s", rvalue);
+ return 0;
+ }
+
+ t->partition_flags_set = true;
+ return 0;
+}
+
+int transfer_read_definition(Transfer *t, const char *path) {
+ int r;
+
+ assert(t);
+ assert(path);
+
+ ConfigTableItem table[] = {
+ { "Transfer", "MinVersion", config_parse_min_version, 0, &t->min_version },
+ { "Transfer", "ProtectVersion", config_parse_protect_version, 0, &t->protected_versions },
+ { "Transfer", "Verify", config_parse_bool, 0, &t->verify },
+ { "Source", "Type", config_parse_resource_type, 0, &t->source.type },
+ { "Source", "Path", config_parse_resource_path, 0, &t->source },
+ { "Source", "MatchPattern", config_parse_resource_pattern, 0, &t->source.patterns },
+ { "Target", "Type", config_parse_resource_type, 0, &t->target.type },
+ { "Target", "Path", config_parse_resource_path, 0, &t->target },
+ { "Target", "MatchPattern", config_parse_resource_pattern, 0, &t->target.patterns },
+ { "Target", "MatchPartitionType", config_parse_resource_ptype, 0, &t->target },
+ { "Target", "PartitionUUID", config_parse_partition_uuid, 0, t },
+ { "Target", "PartitionFlags", config_parse_partition_flags, 0, t },
+ { "Target", "PartitionNoAuto", config_parse_tristate, 0, &t->no_auto },
+ { "Target", "PartitionGrowFileSystem", config_parse_tristate, 0, &t->growfs },
+ { "Target", "ReadOnly", config_parse_tristate, 0, &t->read_only },
+ { "Target", "Mode", config_parse_mode, 0, &t->mode },
+ { "Target", "TriesLeft", config_parse_uint64, 0, &t->tries_left },
+ { "Target", "TriesDone", config_parse_uint64, 0, &t->tries_done },
+ { "Target", "InstancesMax", config_parse_instances_max, 0, &t->instances_max },
+ { "Target", "RemoveTemporary", config_parse_bool, 0, &t->remove_temporary },
+ { "Target", "CurrentSymlink", config_parse_current_symlink, 0, &t->current_symlink },
+ {}
+ };
+
+ r = config_parse(NULL, path, NULL,
+ "Transfer\0"
+ "Source\0"
+ "Target\0",
+ config_item_table_lookup, table,
+ CONFIG_PARSE_WARN,
+ t,
+ NULL);
+ if (r < 0)
+ return r;
+
+ if (!RESOURCE_IS_SOURCE(t->source.type))
+ return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
+ "Source Type= must be one of url-file, url-tar, tar, regular-file, directory, subvolume.");
+
+ if (t->target.type < 0) {
+ switch (t->source.type) {
+
+ case RESOURCE_URL_FILE:
+ case RESOURCE_REGULAR_FILE:
+ t->target.type =
+ t->target.path && path_startswith(t->target.path, "/dev/") ?
+ RESOURCE_PARTITION : RESOURCE_REGULAR_FILE;
+ break;
+
+ case RESOURCE_URL_TAR:
+ case RESOURCE_TAR:
+ case RESOURCE_DIRECTORY:
+ t->target.type = RESOURCE_DIRECTORY;
+ break;
+
+ case RESOURCE_SUBVOLUME:
+ t->target.type = RESOURCE_SUBVOLUME;
+ break;
+
+ default:
+ assert_not_reached();
+ }
+ }
+
+ if (!RESOURCE_IS_TARGET(t->target.type))
+ return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
+ "Target Type= must be one of partition, regular-file, directory, subvolume.");
+
+ if ((IN_SET(t->source.type, RESOURCE_URL_FILE, RESOURCE_PARTITION, RESOURCE_REGULAR_FILE) &&
+ !IN_SET(t->target.type, RESOURCE_PARTITION, RESOURCE_REGULAR_FILE)) ||
+ (IN_SET(t->source.type, RESOURCE_URL_TAR, RESOURCE_TAR, RESOURCE_DIRECTORY, RESOURCE_SUBVOLUME) &&
+ !IN_SET(t->target.type, RESOURCE_DIRECTORY, RESOURCE_SUBVOLUME)))
+ return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
+ "Target type '%s' is incompatible with source type '%s', refusing.",
+ resource_type_to_string(t->source.type), resource_type_to_string(t->target.type));
+
+ if (!t->source.path && !t->source.path_auto)
+ return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
+ "Source specification lacks Path=.");
+
+ if (t->source.path) {
+ if (RESOURCE_IS_FILESYSTEM(t->source.type) || t->source.type == RESOURCE_PARTITION)
+ if (!path_is_absolute(t->source.path) || !path_is_normalized(t->source.path))
+ return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
+ "Source path is not a normalized, absolute path: %s", t->source.path);
+
+ /* We unofficially support file:// in addition to http:// and https:// for url
+ * sources. That's mostly for testing, since it relieves us from having to set up a HTTP
+ * server, and CURL abstracts this away from us thankfully. */
+ if (RESOURCE_IS_URL(t->source.type))
+ if (!http_url_is_valid(t->source.path) && !file_url_is_valid(t->source.path))
+ return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
+ "Source path is not a valid HTTP or HTTPS URL: %s", t->source.path);
+ }
+
+ if (strv_isempty(t->source.patterns))
+ return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
+ "Source specification lacks MatchPattern=.");
+
+ if (!t->target.path && !t->target.path_auto)
+ return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
+ "Target specification lacks Path= field.");
+
+ if (t->target.path &&
+ (!path_is_absolute(t->target.path) || !path_is_normalized(t->target.path)))
+ return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
+ "Target path is not a normalized, absolute path: %s", t->target.path);
+
+ if (strv_isempty(t->target.patterns)) {
+ strv_free(t->target.patterns);
+ t->target.patterns = strv_copy(t->source.patterns);
+ if (!t->target.patterns)
+ return log_oom();
+ }
+
+ if (t->current_symlink && !RESOURCE_IS_FILESYSTEM(t->target.type) && !path_is_absolute(t->current_symlink))
+ return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
+ "Current symlink must be absolute path if target is partition: %s", t->current_symlink);
+
+ /* When no instance limit is set, use all available partition slots in case of partitions, or 3 in case of fs objects */
+ if (t->instances_max == 0)
+ t->instances_max = t->target.type == RESOURCE_PARTITION ? UINT64_MAX : DEFAULT_FILE_INSTANCES_MAX;
+
+ return 0;
+}
+
+int transfer_resolve_paths(
+ Transfer *t,
+ const char *root,
+ const char *node) {
+
+ int r;
+
+ /* If Path=auto is used in [Source] or [Target] sections, let's automatically detect the path of the
+ * block device to use. Moreover, if this path points to a directory but we need a block device,
+ * automatically determine the backing block device, so that users can reference block devices by
+ * mount point. */
+
+ assert(t);
+
+ r = resource_resolve_path(&t->source, root, node);
+ if (r < 0)
+ return r;
+
+ r = resource_resolve_path(&t->target, root, node);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+static void transfer_remove_temporary(Transfer *t) {
+ _cleanup_(closedirp) DIR *d = NULL;
+ int r;
+
+ assert(t);
+
+ if (!t->remove_temporary)
+ return;
+
+ if (!IN_SET(t->target.type, RESOURCE_REGULAR_FILE, RESOURCE_DIRECTORY, RESOURCE_SUBVOLUME))
+ return;
+
+ /* Removes all temporary files/dirs from previous runs in the target directory, i.e. all those starting with '.#' */
+
+ d = opendir(t->target.path);
+ if (!d) {
+ if (errno == ENOENT)
+ return;
+
+ log_debug_errno(errno, "Failed to open target directory '%s', ignoring: %m", t->target.path);
+ return;
+ }
+
+ for (;;) {
+ struct dirent *de;
+
+ errno = 0;
+ de = readdir_no_dot(d);
+ if (!de) {
+ if (errno != 0)
+ log_debug_errno(errno, "Failed to read target directory '%s', ignoring: %m", t->target.path);
+ break;
+ }
+
+ if (!startswith(de->d_name, ".#"))
+ continue;
+
+ r = rm_rf_child(dirfd(d), de->d_name, REMOVE_PHYSICAL|REMOVE_SUBVOLUME|REMOVE_CHMOD);
+ if (r == -ENOENT)
+ continue;
+ if (r < 0) {
+ log_warning_errno(r, "Failed to remove temporary resource instance '%s/%s', ignoring: %m", t->target.path, de->d_name);
+ continue;
+ }
+
+ log_debug("Removed temporary resource instance '%s/%s'.", t->target.path, de->d_name);
+ }
+}
+
+int transfer_vacuum(
+ Transfer *t,
+ uint64_t space,
+ const char *extra_protected_version) {
+
+ uint64_t instances_max, limit;
+ int r, count = 0;
+
+ assert(t);
+
+ transfer_remove_temporary(t);
+
+ /* First, calculate how many instances to keep, based on the instance limit — but keep at least one */
+
+ instances_max = arg_instances_max != UINT64_MAX ? arg_instances_max : t->instances_max;
+ assert(instances_max >= 1);
+ if (instances_max == UINT64_MAX) /* Keep infinite instances? */
+ limit = UINT64_MAX;
+ else if (space > instances_max)
+ return log_error_errno(SYNTHETIC_ERRNO(ENOSPC),
+ "Asked to delete more instances than total maximum allowed number of instances, refusing.");
+ else if (space == instances_max)
+ return log_error_errno(SYNTHETIC_ERRNO(ENOSPC),
+ "Asked to delete all possible instances, can't allow that. One instance must always remain.");
+ else
+ limit = instances_max - space;
+
+ if (t->target.type == RESOURCE_PARTITION) {
+ uint64_t rm, remain;
+
+ /* If we are looking at a partition table, we also have to take into account how many
+ * partition slots of the right type are available */
+
+ if (t->target.n_empty + t->target.n_instances < 2)
+ return log_error_errno(SYNTHETIC_ERRNO(ENOSPC),
+ "Partition table has less than two partition slots of the right type " SD_ID128_UUID_FORMAT_STR " (%s), refusing.",
+ SD_ID128_FORMAT_VAL(t->target.partition_type),
+ gpt_partition_type_uuid_to_string(t->target.partition_type));
+ if (space > t->target.n_empty + t->target.n_instances)
+ return log_error_errno(SYNTHETIC_ERRNO(ENOSPC),
+ "Partition table does not have enough partition slots of right type " SD_ID128_UUID_FORMAT_STR " (%s) for operation.",
+ SD_ID128_FORMAT_VAL(t->target.partition_type),
+ gpt_partition_type_uuid_to_string(t->target.partition_type));
+ if (space == t->target.n_empty + t->target.n_instances)
+ return log_error_errno(SYNTHETIC_ERRNO(ENOSPC),
+ "Asked to empty all partition table slots of the right type " SD_ID128_UUID_FORMAT_STR " (%s), can't allow that. One instance must always remain.",
+ SD_ID128_FORMAT_VAL(t->target.partition_type),
+ gpt_partition_type_uuid_to_string(t->target.partition_type));
+
+ rm = LESS_BY(space, t->target.n_empty);
+ remain = LESS_BY(t->target.n_instances, rm);
+ limit = MIN(limit, remain);
+ }
+
+ while (t->target.n_instances > limit) {
+ Instance *oldest;
+ size_t p = t->target.n_instances - 1;
+
+ for (;;) {
+ oldest = t->target.instances[p];
+ assert(oldest);
+
+ /* If this is listed among the protected versions, then let's not remove it */
+ if (!strv_contains(t->protected_versions, oldest->metadata.version) &&
+ (!extra_protected_version || !streq(extra_protected_version, oldest->metadata.version)))
+ break;
+
+ log_debug("Version '%s' is protected, not removing.", oldest->metadata.version);
+ if (p == 0) {
+ oldest = NULL;
+ break;
+ }
+
+ p--;
+ }
+
+ if (!oldest) /* Nothing more to remove */
+ break;
+
+ assert(oldest->resource);
+
+ log_info("%s Removing old '%s' (%s).", special_glyph(SPECIAL_GLYPH_RECYCLING), oldest->path, resource_type_to_string(oldest->resource->type));
+
+ switch (t->target.type) {
+
+ case RESOURCE_REGULAR_FILE:
+ case RESOURCE_DIRECTORY:
+ case RESOURCE_SUBVOLUME:
+ r = rm_rf(oldest->path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME|REMOVE_MISSING_OK|REMOVE_CHMOD);
+ if (r < 0 && r != -ENOENT)
+ return log_error_errno(r, "Failed to make room, deleting '%s' failed: %m", oldest->path);
+
+ break;
+
+ case RESOURCE_PARTITION: {
+ PartitionInfo pinfo = oldest->partition_info;
+
+ /* label "_empty" means "no contents" for our purposes */
+ pinfo.label = (char*) "_empty";
+
+ r = patch_partition(t->target.path, &pinfo, PARTITION_LABEL);
+ if (r < 0)
+ return r;
+
+ t->target.n_empty++;
+ break;
+ }
+
+ default:
+ assert_not_reached();
+ break;
+ }
+
+ instance_free(oldest);
+ memmove(t->target.instances + p, t->target.instances + p + 1, (t->target.n_instances - p - 1) * sizeof(Instance*));
+ t->target.n_instances--;
+
+ count++;
+ }
+
+ return count;
+}
+
+static void compile_pattern_fields(
+ const Transfer *t,
+ const Instance *i,
+ InstanceMetadata *ret) {
+
+ assert(t);
+ assert(i);
+ assert(ret);
+
+ *ret = (InstanceMetadata) {
+ .version = i->metadata.version,
+
+ /* We generally prefer explicitly configured values for the transfer over those automatically
+ * derived from the source instance. Also, if the source is a tar archive, then let's not
+ * patch mtime/mode and use the one embedded in the tar file */
+ .partition_uuid = t->partition_uuid_set ? t->partition_uuid : i->metadata.partition_uuid,
+ .partition_uuid_set = t->partition_uuid_set || i->metadata.partition_uuid_set,
+ .partition_flags = t->partition_flags_set ? t->partition_flags : i->metadata.partition_flags,
+ .partition_flags_set = t->partition_flags_set || i->metadata.partition_flags_set,
+ .mtime = RESOURCE_IS_TAR(i->resource->type) ? USEC_INFINITY : i->metadata.mtime,
+ .mode = t->mode != MODE_INVALID ? t->mode : (RESOURCE_IS_TAR(i->resource->type) ? MODE_INVALID : i->metadata.mode),
+ .size = i->metadata.size,
+ .tries_done = t->tries_done != UINT64_MAX ? t->tries_done :
+ i->metadata.tries_done != UINT64_MAX ? i->metadata.tries_done : 0,
+ .tries_left = t->tries_left != UINT64_MAX ? t->tries_left :
+ i->metadata.tries_left != UINT64_MAX ? i->metadata.tries_left : 3,
+ .no_auto = t->no_auto >= 0 ? t->no_auto : i->metadata.no_auto,
+ .read_only = t->read_only >= 0 ? t->read_only : i->metadata.read_only,
+ .growfs = t->growfs >= 0 ? t->growfs : i->metadata.growfs,
+ .sha256sum_set = i->metadata.sha256sum_set,
+ };
+
+ memcpy(ret->sha256sum, i->metadata.sha256sum, sizeof(ret->sha256sum));
+}
+
+static int run_helper(
+ const char *name,
+ const char *path,
+ const char * const cmdline[]) {
+
+ int r;
+
+ assert(name);
+ assert(path);
+ assert(cmdline);
+
+ r = safe_fork(name, FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG|FORK_WAIT, NULL);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ /* Child */
+
+ (void) unsetenv("NOTIFY_SOCKET");
+ execv(path, (char *const*) cmdline);
+ log_error_errno(errno, "Failed to execute %s tool: %m", path);
+ _exit(EXIT_FAILURE);
+ }
+
+ return 0;
+}
+
+int transfer_acquire_instance(Transfer *t, Instance *i) {
+ _cleanup_free_ char *formatted_pattern = NULL, *digest = NULL;
+ char offset[DECIMAL_STR_MAX(uint64_t)+1], max_size[DECIMAL_STR_MAX(uint64_t)+1];
+ const char *where = NULL;
+ InstanceMetadata f;
+ Instance *existing;
+ int r;
+
+ assert(t);
+ assert(i);
+ assert(i->resource);
+ assert(t == container_of(i->resource, Transfer, source));
+
+ /* Does this instance already exist in the target? Then we don't need to acquire anything */
+ existing = resource_find_instance(&t->target, i->metadata.version);
+ if (existing) {
+ log_info("No need to acquire '%s', already installed.", i->path);
+ return 0;
+ }
+
+ assert(!t->final_path);
+ assert(!t->temporary_path);
+ assert(!strv_isempty(t->target.patterns));
+
+ /* Format the target name using the first pattern specified */
+ compile_pattern_fields(t, i, &f);
+ r = pattern_format(t->target.patterns[0], &f, &formatted_pattern);
+ if (r < 0)
+ return log_error_errno(r, "Failed to format target pattern: %m");
+
+ if (RESOURCE_IS_FILESYSTEM(t->target.type)) {
+
+ if (!filename_is_valid(formatted_pattern))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Formatted pattern is not suitable as file name, refusing: %s", formatted_pattern);
+
+ t->final_path = path_join(t->target.path, formatted_pattern);
+ if (!t->final_path)
+ return log_oom();
+
+ r = tempfn_random(t->final_path, "sysupdate", &t->temporary_path);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate temporary target path: %m");
+
+ where = t->final_path;
+ }
+
+ if (t->target.type == RESOURCE_PARTITION) {
+ r = gpt_partition_label_valid(formatted_pattern);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine if formatted pattern is suitable as GPT partition label: %s", formatted_pattern);
+ if (!r)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Formatted pattern is not suitable as GPT partition label, refusing: %s", formatted_pattern);
+
+ r = find_suitable_partition(
+ t->target.path,
+ i->metadata.size,
+ t->target.partition_type_set ? &t->target.partition_type : NULL,
+ &t->partition_info);
+ if (r < 0)
+ return r;
+
+ xsprintf(offset, "%" PRIu64, t->partition_info.start);
+ xsprintf(max_size, "%" PRIu64, t->partition_info.size);
+
+ where = t->partition_info.device;
+ }
+
+ assert(where);
+
+ log_info("%s Acquiring %s %s %s...", special_glyph(SPECIAL_GLYPH_DOWNLOAD), i->path, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), where);
+
+ if (RESOURCE_IS_URL(i->resource->type)) {
+ /* For URL sources we require the SHA256 sum to be known so that we can validate the
+ * download. */
+
+ if (!i->metadata.sha256sum_set)
+ return log_error_errno(r, "SHA256 checksum not known for download '%s', refusing.", i->path);
+
+ digest = hexmem(i->metadata.sha256sum, sizeof(i->metadata.sha256sum));
+ if (!digest)
+ return log_oom();
+ }
+
+ switch (i->resource->type) { /* Source */
+
+ case RESOURCE_REGULAR_FILE:
+
+ switch (t->target.type) { /* Target */
+
+ case RESOURCE_REGULAR_FILE:
+
+ /* regular file → regular file (why fork off systemd-import for such a simple file
+ * copy case? implicit decompression mostly, and thus also sandboxing. Also, the
+ * importer has some tricks up its sleeve, such as sparse file generation, which we
+ * want to take benefit of, too.) */
+
+ r = run_helper("(sd-import-raw)",
+ import_binary_path(),
+ (const char* const[]) {
+ "systemd-import",
+ "raw",
+ "--direct", /* just copy/unpack the specified file, don't do anything else */
+ arg_sync ? "--sync=yes" : "--sync=no",
+ i->path,
+ t->temporary_path,
+ NULL
+ });
+ break;
+
+ case RESOURCE_PARTITION:
+
+ /* regular file → partition */
+
+ r = run_helper("(sd-import-raw)",
+ import_binary_path(),
+ (const char* const[]) {
+ "systemd-import",
+ "raw",
+ "--direct", /* just copy/unpack the specified file, don't do anything else */
+ "--offset", offset,
+ "--size-max", max_size,
+ arg_sync ? "--sync=yes" : "--sync=no",
+ i->path,
+ t->target.path,
+ NULL
+ });
+ break;
+
+ default:
+ assert_not_reached();
+ }
+
+ break;
+
+ case RESOURCE_DIRECTORY:
+ case RESOURCE_SUBVOLUME:
+ assert(IN_SET(t->target.type, RESOURCE_DIRECTORY, RESOURCE_SUBVOLUME));
+
+ /* directory/subvolume → directory/subvolume */
+
+ r = run_helper("(sd-import-fs)",
+ import_fs_binary_path(),
+ (const char* const[]) {
+ "systemd-import-fs",
+ "run",
+ "--direct", /* just untar the specified file, don't do anything else */
+ arg_sync ? "--sync=yes" : "--sync=no",
+ t->target.type == RESOURCE_SUBVOLUME ? "--btrfs-subvol=yes" : "--btrfs-subvol=no",
+ i->path,
+ t->temporary_path,
+ NULL
+ });
+ break;
+
+ case RESOURCE_TAR:
+ assert(IN_SET(t->target.type, RESOURCE_DIRECTORY, RESOURCE_SUBVOLUME));
+
+ /* tar → directory/subvolume */
+
+ r = run_helper("(sd-import-tar)",
+ import_binary_path(),
+ (const char* const[]) {
+ "systemd-import",
+ "tar",
+ "--direct", /* just untar the specified file, don't do anything else */
+ arg_sync ? "--sync=yes" : "--sync=no",
+ t->target.type == RESOURCE_SUBVOLUME ? "--btrfs-subvol=yes" : "--btrfs-subvol=no",
+ i->path,
+ t->temporary_path,
+ NULL
+ });
+ break;
+
+ case RESOURCE_URL_FILE:
+
+ switch (t->target.type) {
+
+ case RESOURCE_REGULAR_FILE:
+
+ /* url file → regular file */
+
+ r = run_helper("(sd-pull-raw)",
+ pull_binary_path(),
+ (const char* const[]) {
+ "systemd-pull",
+ "raw",
+ "--direct", /* just download the specified URL, don't download anything else */
+ "--verify", digest, /* validate by explicit SHA256 sum */
+ arg_sync ? "--sync=yes" : "--sync=no",
+ i->path,
+ t->temporary_path,
+ NULL
+ });
+ break;
+
+ case RESOURCE_PARTITION:
+
+ /* url file → partition */
+
+ r = run_helper("(sd-pull-raw)",
+ pull_binary_path(),
+ (const char* const[]) {
+ "systemd-pull",
+ "raw",
+ "--direct", /* just download the specified URL, don't download anything else */
+ "--verify", digest, /* validate by explicit SHA256 sum */
+ "--offset", offset,
+ "--size-max", max_size,
+ arg_sync ? "--sync=yes" : "--sync=no",
+ i->path,
+ t->target.path,
+ NULL
+ });
+ break;
+
+ default:
+ assert_not_reached();
+ }
+
+ break;
+
+ case RESOURCE_URL_TAR:
+ assert(IN_SET(t->target.type, RESOURCE_DIRECTORY, RESOURCE_SUBVOLUME));
+
+ r = run_helper("(sd-pull-tar)",
+ pull_binary_path(),
+ (const char*const[]) {
+ "systemd-pull",
+ "tar",
+ "--direct", /* just download the specified URL, don't download anything else */
+ "--verify", digest, /* validate by explicit SHA256 sum */
+ t->target.type == RESOURCE_SUBVOLUME ? "--btrfs-subvol=yes" : "--btrfs-subvol=no",
+ arg_sync ? "--sync=yes" : "--sync=no",
+ i->path,
+ t->temporary_path,
+ NULL
+ });
+ break;
+
+ default:
+ assert_not_reached();
+ }
+ if (r < 0)
+ return r;
+
+ if (RESOURCE_IS_FILESYSTEM(t->target.type)) {
+ bool need_sync = false;
+ assert(t->temporary_path);
+
+ /* Apply file attributes if set */
+ if (f.mtime != USEC_INFINITY) {
+ struct timespec ts;
+
+ timespec_store(&ts, f.mtime);
+
+ if (utimensat(AT_FDCWD, t->temporary_path, (struct timespec[2]) { ts, ts }, AT_SYMLINK_NOFOLLOW) < 0)
+ return log_error_errno(errno, "Failed to adjust mtime of '%s': %m", t->temporary_path);
+
+ need_sync = true;
+ }
+
+ if (f.mode != MODE_INVALID) {
+ /* Try with AT_SYMLINK_NOFOLLOW first, because it's the safe thing to do. Older
+ * kernels don't support that however, in that case we fall back to chmod(). Not as
+ * safe, but shouldn't be a problem, given that we don't create symlinks here. */
+ if (fchmodat(AT_FDCWD, t->temporary_path, f.mode, AT_SYMLINK_NOFOLLOW) < 0 &&
+ (!ERRNO_IS_NOT_SUPPORTED(errno) || chmod(t->temporary_path, f.mode) < 0))
+ return log_error_errno(errno, "Failed to adjust mode of '%s': %m", t->temporary_path);
+
+ need_sync = true;
+ }
+
+ /* Synchronize */
+ if (arg_sync && need_sync) {
+ if (t->target.type == RESOURCE_REGULAR_FILE)
+ r = fsync_path_and_parent_at(AT_FDCWD, t->temporary_path);
+ else {
+ assert(IN_SET(t->target.type, RESOURCE_DIRECTORY, RESOURCE_SUBVOLUME));
+ r = syncfs_path(AT_FDCWD, t->temporary_path);
+ }
+ if (r < 0)
+ return log_error_errno(r, "Failed to synchronize file system backing '%s': %m", t->temporary_path);
+ }
+
+ t->install_read_only = f.read_only;
+ }
+
+ if (t->target.type == RESOURCE_PARTITION) {
+ free_and_replace(t->partition_info.label, formatted_pattern);
+ t->partition_change = PARTITION_LABEL;
+
+ if (f.partition_uuid_set) {
+ t->partition_info.uuid = f.partition_uuid;
+ t->partition_change |= PARTITION_UUID;
+ }
+
+ if (f.partition_flags_set) {
+ t->partition_info.flags = f.partition_flags;
+ t->partition_change |= PARTITION_FLAGS;
+ }
+
+ if (f.no_auto >= 0) {
+ t->partition_info.no_auto = f.no_auto;
+ t->partition_change |= PARTITION_NO_AUTO;
+ }
+
+ if (f.read_only >= 0) {
+ t->partition_info.read_only = f.read_only;
+ t->partition_change |= PARTITION_READ_ONLY;
+ }
+
+ if (f.growfs >= 0) {
+ t->partition_info.growfs = f.growfs;
+ t->partition_change |= PARTITION_GROWFS;
+ }
+ }
+
+ /* For regular file cases the only step left is to install the file in place, which install_file()
+ * will do via rename(). For partition cases the only step left is to update the partition table,
+ * which is done at the same place. */
+
+ log_info("Successfully acquired '%s'.", i->path);
+ return 0;
+}
+
+int transfer_install_instance(
+ Transfer *t,
+ Instance *i,
+ const char *root) {
+
+ int r;
+
+ assert(t);
+ assert(i);
+ assert(i->resource);
+ assert(t == container_of(i->resource, Transfer, source));
+
+ if (t->temporary_path) {
+ assert(RESOURCE_IS_FILESYSTEM(t->target.type));
+ assert(t->final_path);
+
+ r = install_file(AT_FDCWD, t->temporary_path,
+ AT_FDCWD, t->final_path,
+ INSTALL_REPLACE|
+ (t->install_read_only > 0 ? INSTALL_READ_ONLY : 0)|
+ (t->target.type == RESOURCE_REGULAR_FILE ? INSTALL_FSYNC_FULL : INSTALL_SYNCFS));
+ if (r < 0)
+ return log_error_errno(r, "Failed to move '%s' into place: %m", t->final_path);
+
+ log_info("Successfully installed '%s' (%s) as '%s' (%s).",
+ i->path,
+ resource_type_to_string(i->resource->type),
+ t->final_path,
+ resource_type_to_string(t->target.type));
+
+ t->temporary_path = mfree(t->temporary_path);
+ }
+
+ if (t->partition_change != 0) {
+ assert(t->target.type == RESOURCE_PARTITION);
+
+ r = patch_partition(
+ t->target.path,
+ &t->partition_info,
+ t->partition_change);
+ if (r < 0)
+ return r;
+
+ log_info("Successfully installed '%s' (%s) as '%s' (%s).",
+ i->path,
+ resource_type_to_string(i->resource->type),
+ t->partition_info.device,
+ resource_type_to_string(t->target.type));
+ }
+
+ if (t->current_symlink) {
+ _cleanup_free_ char *buf = NULL, *parent = NULL, *relative = NULL, *resolved = NULL;
+ const char *link_path, *link_target;
+ bool resolve_link_path = false;
+
+ if (RESOURCE_IS_FILESYSTEM(t->target.type)) {
+
+ assert(t->target.path);
+
+ if (path_is_absolute(t->current_symlink)) {
+ link_path = t->current_symlink;
+ resolve_link_path = true;
+ } else {
+ buf = path_make_absolute(t->current_symlink, t->target.path);
+ if (!buf)
+ return log_oom();
+
+ link_path = buf;
+ }
+
+ link_target = t->final_path;
+
+ } else if (t->target.type == RESOURCE_PARTITION) {
+
+ assert(path_is_absolute(t->current_symlink));
+
+ link_path = t->current_symlink;
+ link_target = t->partition_info.device;
+
+ resolve_link_path = true;
+ } else
+ assert_not_reached();
+
+ if (resolve_link_path && root) {
+ r = chase_symlinks(link_path, root, CHASE_PREFIX_ROOT|CHASE_NONEXISTENT, &resolved, NULL);
+ if (r < 0)
+ return log_error_errno(r, "Failed to resolve current symlink path '%s': %m", link_path);
+
+ link_path = resolved;
+ }
+
+ if (link_target) {
+ r = path_extract_directory(link_path, &parent);
+ if (r < 0)
+ return log_error_errno(r, "Failed to extract directory of target path '%s': %m", link_path);
+
+ r = path_make_relative(parent, link_target, &relative);
+ if (r < 0)
+ return log_error_errno(r, "Failed to make symlink path '%s' relative to '%s': %m", link_target, parent);
+
+ r = symlink_atomic(relative, link_path);
+ if (r < 0)
+ return log_error_errno(r, "Failed to update current symlink '%s' %s '%s': %m",
+ link_path,
+ special_glyph(SPECIAL_GLYPH_ARROW_RIGHT),
+ relative);
+
+ log_info("Updated symlink '%s' %s '%s'.",
+ link_path, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), relative);
+ }
+ }
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 13:57:03 +0000