Merge "Move build.prop to ./etc subdir for some partitions" am: 90fe62e7

#include <android-base/chrono_utils.h>

#include <android-base/file.h>

#include <android-base/logging.h>

#include <android-base/parseint.h>

#include <android-base/properties.h>

#include <android-base/stringprintf.h>

#include <android-base/strings.h>

using namespace std::literals;

using android::base::GetProperty;

using android::base::ParseInt;

using android::base::ReadFileToString;

using android::base::Split;

using android::base::StartsWith;

        load_properties_from_file("/prop.default", nullptr, &properties);

    }

    load_properties_from_file("/system/build.prop", nullptr, &properties);

    load_properties_from_file("/system_ext/build.prop", nullptr, &properties);

    // /<part>/etc/build.prop is the canonical location of the build-time properties since S.

    // Falling back to /<part>/defalt.prop and /<part>/build.prop only when legacy path has to

    // be supported, which is controlled by the support_legacy_path_until argument.

    const auto load_properties_from_partition = [&properties](const std::string& partition,

                                                              int support_legacy_path_until) {

        auto path = "/" + partition + "/etc/build.prop";

        if (load_properties_from_file(path.c_str(), nullptr, &properties)) {

            return;

        }

        // To read ro.<partition>.build.version.sdk, temporarily load the legacy paths into a

        // separate map. Then by comparing its value with legacy_version, we know that if the

        // partition is old enough so that we need to respect the legacy paths.

        std::map<std::string, std::string> temp;

        auto legacy_path1 = "/" + partition + "/default.prop";

        auto legacy_path2 = "/" + partition + "/build.prop";

        load_properties_from_file(legacy_path1.c_str(), nullptr, &temp);

        load_properties_from_file(legacy_path2.c_str(), nullptr, &temp);

        bool support_legacy_path = false;

        auto version_prop_name = "ro." + partition + ".build.version.sdk";

        auto it = temp.find(version_prop_name);

        if (it == temp.end()) {

            // This is embarassing. Without the prop, we can't determine how old the partition is.

            // Let's be conservative by assuming it is very very old.

            support_legacy_path = true;

        } else if (int value;

                   ParseInt(it->second.c_str(), &value) && value <= support_legacy_path_until) {

            support_legacy_path = true;

        }

        if (support_legacy_path) {

            // We don't update temp into properties directly as it might skip any (future) logic

            // for resolving duplicates implemented in load_properties_from_file.  Instead, read

            // the files again into the properties map.

            load_properties_from_file(legacy_path1.c_str(), nullptr, &properties);

            load_properties_from_file(legacy_path2.c_str(), nullptr, &properties);

        } else {

            LOG(FATAL) << legacy_path1 << " and " << legacy_path2 << " were not loaded "

                       << "because " << version_prop_name << "(" << it->second << ") is newer "

                       << "than " << support_legacy_path_until;

        }

    };

    // TODO(b/117892318): uncomment the following condition when vendor.imgs for

    // aosp_* targets are all updated.

    // Order matters here. The more the partition is specific to a product, the higher its

    // precedence is.

    load_properties_from_file("/system/build.prop", nullptr, &properties);

    load_properties_from_partition("system_ext", /* support_legacy_path_until */ 30);

    // TODO(b/117892318): uncomment the following condition when vendor.imgs for aosp_* targets are

    // all updated.

    // if (SelinuxGetVendorAndroidVersion() <= __ANDROID_API_R__) {

    load_properties_from_file("/vendor/default.prop", nullptr, &properties);

    // }

    load_properties_from_file("/vendor/build.prop", nullptr, &properties);

    load_properties_from_partition("odm", /* support_legacy_path_until */ 28);

    load_properties_from_partition("product", /* support_legacy_path_until */ 30);

    if (SelinuxGetVendorAndroidVersion() >= __ANDROID_API_Q__) {

        load_properties_from_file("/odm/etc/build.prop", nullptr, &properties);

    } else {

        load_properties_from_file("/odm/default.prop", nullptr, &properties);

        load_properties_from_file("/odm/build.prop", nullptr, &properties);

    }

    load_properties_from_file("/product/build.prop", nullptr, &properties);

    load_properties_from_file("/factory/factory.prop", "ro.*", &properties);

    if (access(kDebugRamdiskProp, R_OK) == 0) {