static int CheckAccess()

in src/common/commonutils/FileUtils.c [563:646]
74 lines of code
20 McCabe index (conditional complexity)

static int CheckAccess(bool directory, const char* name, int desiredOwnerId, int desiredGroupId, unsigned int desiredAccess, bool rootCanOverwriteOwnership, char** reason, OsConfigLogHandle log)
{
    struct stat statStruct = {0};
    mode_t currentMode = 0;
    mode_t desiredMode = 0;
    int result = ENOENT;

    if (NULL == name)
    {
        OsConfigLogError(log, "CheckAccess called with an invalid name argument");
        return EINVAL;
    }

    if (directory ? DirectoryExists(name) : FileExists(name))
    {
        if (0 == (result = stat(name, &statStruct)))
        {
            if (((-1 != desiredOwnerId) && (((uid_t)desiredOwnerId != statStruct.st_uid) && (directory && rootCanOverwriteOwnership && ((0 != statStruct.st_uid))))) ||
                ((-1 != desiredGroupId) && (((gid_t)desiredGroupId != statStruct.st_gid) && (directory && rootCanOverwriteOwnership && ((0 != statStruct.st_gid))))))
            {
                OsConfigLogInfo(log, "CheckAccess: ownership of '%s' (%d, %d) does not match expected (%d, %d)",
                    name, statStruct.st_uid, statStruct.st_gid, desiredOwnerId, desiredGroupId);
                OsConfigCaptureReason(reason, "Ownership of '%s' (%d, %d) does not match expected (%d, %d)",
                    name, statStruct.st_uid, statStruct.st_gid, desiredOwnerId, desiredGroupId);
                result = ENOENT;
            }
            else
            {
                // Special case for the MPI Client
                if (NULL != log)
                {
                    OsConfigLogInfo(log, "CheckAccess: ownership of '%s' (%d, %d) matches expected (%d, %d)",
                        name, statStruct.st_uid, statStruct.st_gid, desiredOwnerId, desiredGroupId);
                }

                currentMode = statStruct.st_mode & 07777;
                desiredMode = desiredAccess & 07777;

                // S_ISVTX (01000): restricted deletion flag (for directories only)
                if (!directory)
                {
                    desiredMode &= ~S_ISVTX;
                }

                if (currentMode != desiredMode)
                {
                    OsConfigLogInfo(log, "CheckAccess: access to '%s' (%03o) does not match expected (%03o)", name, currentMode, desiredMode);
                    OsConfigCaptureReason(reason, "Access to '%s' (%03o) does not match expected (%03o)", name, currentMode, desiredMode);
                    result = ENOENT;
                }
                else
                {
                    // Special case for the MPI Client
                    if (NULL != log)
                    {
                        OsConfigLogInfo(log, "CheckAccess: access to '%s' (%03o) matches expected (%03o)", name, currentMode, desiredMode);
                    }

                    OsConfigCaptureSuccessReason(reason, "'%s' has required access (%03o) and ownership (uid: %d, gid: %u)", name, desiredMode, desiredOwnerId, desiredGroupId);
                    result = 0;
                }
            }
        }
        else
        {
            OsConfigLogInfo(log, "CheckAccess: stat('%s') failed with %d", name, errno);
        }
    }
    else
    {
        OsConfigLogInfo(log, "CheckAccess: '%s' is not found, nothing to check", name);
        if (OsConfigIsSuccessReason(reason))
        {
            OsConfigCaptureSuccessReason(reason, "'%s' is not found, nothing to check", name);
        }
        else
        {
            OsConfigCaptureReason(reason, "'%s' is not found", name);
        }
        result = 0;
    }

    return result;
}