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Commit da1ebaef authored by Doug Zongker's avatar Doug Zongker
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recovery: save logs from the last few invocations of recovery 

Extends the last_log mechanism to save logs from the last six
invocations of recovery, so that we're more likely to have useful logs
even if the device has repeatedly booted into recovery.

Change-Id: I08ae7a09553ada45f9e0733fe1e55e5a22efd9f9
parent 7c3ae45e

recovery.cpp

+19 −1
Original line number Diff line number Diff line
@@ -59,10 +59,11 @@ static const struct option OPTIONS[] = { 
  { NULL, 0, NULL, 0 },

};



#define LAST_LOG_FILE "/cache/recovery/last_log"



static const char *COMMAND_FILE = "/cache/recovery/command";

static const char *INTENT_FILE = "/cache/recovery/intent";

static const char *LOG_FILE = "/cache/recovery/log";

static const char *LAST_LOG_FILE = "/cache/recovery/last_log";

static const char *LAST_INSTALL_FILE = "/cache/recovery/last_install";

static const char *LOCALE_FILE = "/cache/recovery/last_locale";

static const char *CACHE_ROOT = "/cache";
@@ -260,6 +261,21 @@ copy_log_file(const char* source, const char* destination, int append) { 
    }

}



// Rename last_log -> last_log.1 -> last_log.2 -> ... -> last_log.$max

// Overwrites any existing last_log.$max.

static void

rotate_last_logs(int max) {

    char oldfn[256];

    char newfn[256];



    int i;

    for (i = max-1; i >= 0; --i) {

        snprintf(oldfn, sizeof(oldfn), (i==0) ? LAST_LOG_FILE : (LAST_LOG_FILE ".%d"), i);

        snprintf(newfn, sizeof(newfn), LAST_LOG_FILE ".%d", i+1);

        // ignore errors

        rename(oldfn, newfn);

    }

}



// clear the recovery command and prepare to boot a (hopefully working) system,

// copy our log file to cache as well (for the system to read), and
@@ -843,6 +859,8 @@ main(int argc, char **argv) { 
    printf("Starting recovery on %s", ctime(&start));



    load_volume_table();

    ensure_path_mounted(LAST_LOG_FILE);

    rotate_last_logs(5);

    get_args(&argc, &argv);



    int previous_runs = 0;