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-rw-r--r--ftparchive/byhash.cc61
1 files changed, 61 insertions, 0 deletions
diff --git a/ftparchive/byhash.cc b/ftparchive/byhash.cc
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--- /dev/null
+++ b/ftparchive/byhash.cc
@@ -0,0 +1,61 @@
+// -*- 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>
+
+#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;
+}