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// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
/* ######################################################################
ByHash
ByHash helper functions
##################################################################### */
/*}}}*/
// Include Files /*{{{*/
#include <config.h>
#include<algorithm>
#include<string>
#include <unistd.h>
#include <sys/stat.h>
#define st_mtim st_mtimespec
#include <apt-pkg/fileutl.h>
#include <apt-pkg/hashes.h>
#include "byhash.h"
// Delete all files in a directory except the most recent N ones
void DeleteAllButMostRecent(std::string dir, int KeepFiles)
{
struct Cmp {
bool operator() (const std::string& lhs, const std::string& rhs) {
struct stat buf_l, buf_r;
stat(lhs.c_str(), &buf_l);
stat(rhs.c_str(), &buf_r);
if (buf_l.st_mtim.tv_sec == buf_r.st_mtim.tv_sec)
return buf_l.st_mtim.tv_nsec < buf_r.st_mtim.tv_nsec;
return buf_l.st_mtim.tv_sec < buf_r.st_mtim.tv_sec;
}
};
if (!DirectoryExists(dir))
return;
auto files = GetListOfFilesInDir(dir, false);
std::sort(files.begin(), files.end(), Cmp());
for (auto I=files.begin(); I<files.end()-KeepFiles; ++I)
RemoveFile("DeleteAllButMostRecent", *I);
}
// Takes a input filename (e.g. binary-i386/Packages) and a hashstring
// of the Input data and transforms it into a suitable by-hash filename
std::string GenByHashFilename(std::string ByHashOutputFile, HashString const &h)
{
std::string const ByHash = "/by-hash/" + h.HashType() + "/" + h.HashValue();
size_t trailing_slash = ByHashOutputFile.find_last_of("/");
if (trailing_slash == std::string::npos)
trailing_slash = 0;
ByHashOutputFile = ByHashOutputFile.replace(
trailing_slash,
ByHashOutputFile.substr(trailing_slash+1).size()+1,
ByHash);
return ByHashOutputFile;
}
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