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Commit d97386c3 authored by Daniel Rosenberg's avatar Daniel Rosenberg
Browse files

libsnapshot: Add silent option to inspect_cow 

This adds the -s option to not print out Cow information, providing a
simple benchmark for reading and iterating through a cow file one time.

Bug: 172026020
Test: inspect cow -s [file]
Change-Id: I6e8b80a80c71155364b8467acd556d00f1dd2a42
parent c62fdd91

fs_mgr/libsnapshot/inspect_cow.cpp

+38 −12
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
// limitations under the License.

//

#include <stdio.h>

#include <unistd.h>



#include <iostream>

#include <string>
@@ -34,7 +35,11 @@ void MyLogger(android::base::LogId, android::base::LogSeverity severity, const c 
    }

}



static bool Inspect(const std::string& path) {

static void usage(void) {

    LOG(ERROR) << "Usage: inspect_cow [-s] <COW_FILE>";

}



static bool Inspect(const std::string& path, bool silent) {

    android::base::unique_fd fd(open(path.c_str(), O_RDONLY));

    if (fd < 0) {

        PLOG(ERROR) << "open failed: " << path;
@@ -52,19 +57,29 @@ static bool Inspect(const std::string& path) { 
        LOG(ERROR) << "could not get header: " << path;

        return false;

    }

    CowFooter footer;

    bool has_footer = false;

    if (reader.GetFooter(&footer)) has_footer = true;



    if (!silent) {

        std::cout << "Major version: " << header.major_version << "\n";

        std::cout << "Minor version: " << header.minor_version << "\n";

        std::cout << "Header size: " << header.header_size << "\n";

        std::cout << "Footer size: " << header.footer_size << "\n";

        std::cout << "Block size: " << header.block_size << "\n";

        std::cout << "\n";

        if (has_footer) {

            std::cout << "Total Ops size: " << footer.op.ops_size << "\n";

            std::cout << "Number of Ops: " << footer.op.num_ops << "\n";

            std::cout << "\n";

        }

    }



    auto iter = reader.GetOpIter();

    while (!iter->Done()) {

        const CowOperation& op = iter->Get();



        std::cout << op << "\n";

        if (!silent) std::cout << op << "\n";



        iter->Next();

    }
@@ -76,14 +91,25 @@ static bool Inspect(const std::string& path) { 
}  // namespace android



int main(int argc, char** argv) {

    int ch;

    bool silent = false;

    while ((ch = getopt(argc, argv, "s")) != -1) {

        switch (ch) {

            case 's':

                silent = true;

                break;

            default:

                android::snapshot::usage();

        }

    }

    android::base::InitLogging(argv, android::snapshot::MyLogger);



    if (argc < 2) {

        LOG(ERROR) << "Usage: inspect_cow <COW_FILE>";

    if (argc < optind + 1) {

        android::snapshot::usage();

        return 1;

    }



    if (!android::snapshot::Inspect(argv[1])) {

    if (!android::snapshot::Inspect(argv[optind], silent)) {

        return 1;

    }

    return 0;