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Add md5 of ROS_PACKAGE_PATH to cache file names. #28

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Add md5 of ROS_PACKAGE_PATH to cache file names. #28

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33e6848
Add md5 of ROS_PACKAGE_PATH to cache file names.
Dec 13, 2013
f53a188
Compute package path hash by XOR.
Dec 16, 2013
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1 change: 1 addition & 0 deletions include/rospack/rospack.h
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Original file line number Diff line number Diff line change
Expand Up @@ -180,6 +180,7 @@ class ROSPACK_DECL Rosstackage
std::vector<std::string>& indented_deps,
bool no_recursion_on_wet=false);
std::string getCachePath();
std::string getCacheName();
bool readCache();
void writeCache();
FILE* validateCache();
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28 changes: 27 additions & 1 deletion src/rospack.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1893,6 +1893,32 @@ Rosstackage::gatherDepsFull(Stackage* stackage, bool direct,
dep_chain);
}

std::string
Rosstackage::getCacheName()
{
char *rpp = getenv("ROS_PACKAGE_PATH");
if(rpp == NULL) {
return cache_name_;
}

const unsigned int HASH_SIZE = 16;
char hash_result[HASH_SIZE];
memset(hash_result, 0, HASH_SIZE);

for(unsigned int i = 0; i < strlen(rpp); i++) {
hash_result[i % HASH_SIZE] ^= rpp[i];
}

// convert to hex for output
char out_buf[HASH_SIZE*2 + 1]; // 2 hex out bytes per byte + \0
for(unsigned int i = 0; i < HASH_SIZE; i++) {
// per step XX\0 - always overwriting the \0 from the step before
snprintf(out_buf + (2*i), 3, "%02X", hash_result[i]);
}

return cache_name_ + "_" + out_buf;
}

std::string
Rosstackage::getCachePath()
{
Expand Down Expand Up @@ -1937,7 +1963,7 @@ Rosstackage::getCachePath()
logWarn(std::string("cannot create rospack cache directory ") +
cache_path.string() + ": " + e.what());
}
cache_path /= cache_name_;
cache_path /= getCacheName();
return cache_path.string();
}

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