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// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
/* ######################################################################
File URI method for APT
This simply checks that the file specified exists, if so the relevant
information is returned. If a .gz filename is specified then the file
name with .gz removed will also be checked and information about it
will be returned in Alt-*
##################################################################### */
/*}}}*/
// Include Files /*{{{*/
#include <config.h>
#include "aptmethod.h"
#include <apt-pkg/aptconfiguration.h>
#include <apt-pkg/error.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/hashes.h>
#include <apt-pkg/strutl.h>
#include <string>
#include <sys/stat.h>
#include <apti18n.h>
/*}}}*/
class FileMethod final : public aptMethod
{
bool URIAcquire(std::string const &Message, FetchItem *Itm) override;
public:
FileMethod() : aptMethod("file", "1.0", SingleInstance | SendConfig | LocalOnly | SendURIEncoded)
{
SeccompFlags = aptMethod::BASE;
}
};
// FileMethod::Fetch - Fetch a file /*{{{*/
// ---------------------------------------------------------------------
/* */
bool FileMethod::URIAcquire(std::string const &Message, FetchItem *Itm)
{
URI Get(Itm->Uri);
if (Get.Host.empty() == false)
return _error->Error(_("Invalid URI, local URIS must not start with //"));
std::vector<std::string> Files;
Files.emplace_back(DecodeSendURI(Get.Path));
for (auto const &AltPath : VectorizeString(LookupTag(Message, "Alternate-Paths"), '\n'))
Files.emplace_back(CombineWithAlternatePath(flNotFile(Files[0]), DecodeSendURI(AltPath)));
FetchResult Res;
// deal with destination files which might linger around
struct stat Buf;
if (lstat(Itm->DestFile.c_str(), &Buf) == 0 && S_ISLNK(Buf.st_mode) && Buf.st_size > 0)
{
char name[Buf.st_size + 1];
if (ssize_t const sp = readlink(Itm->DestFile.c_str(), name, Buf.st_size); sp == -1)
{
Itm->LastModified = 0;
RemoveFile("file", Itm->DestFile);
}
}
int olderrno = 0;
// See if the file exists
for (auto const &File : Files)
{
if (stat(File.c_str(), &Buf) == 0)
{
Res.Size = Buf.st_size;
Res.Filename = File;
Res.LastModified = Buf.st_mtime;
Res.IMSHit = false;
if (Itm->LastModified == Buf.st_mtime && Itm->LastModified != 0)
{
auto const filesize = Itm->ExpectedHashes.FileSize();
if (filesize != 0 && filesize == Res.Size)
Res.IMSHit = true;
}
break;
}
if (olderrno == 0)
olderrno = errno;
}
if (not Res.IMSHit)
{
RemoveFile("file", Itm->DestFile);
if (not Res.Filename.empty())
{
URIStart(Res);
CalculateHashes(Itm, Res);
}
}
// See if the uncompressed file exists and reuse it
FetchResult AltRes;
for (auto const &File : Files)
{
for (const auto &ext : APT::Configuration::getCompressorExtensions())
{
if (APT::String::Endswith(File, ext))
{
std::string const unfile = File.substr(0, File.length() - ext.length());
if (stat(unfile.c_str(), &Buf) == 0)
{
AltRes.Size = Buf.st_size;
AltRes.Filename = unfile;
AltRes.LastModified = Buf.st_mtime;
AltRes.IMSHit = false;
if (Itm->LastModified == Buf.st_mtime && Itm->LastModified != 0)
AltRes.IMSHit = true;
if (Res.Filename.empty())
{
URIStart(Res);
CalculateHashes(Itm, AltRes);
}
break;
}
// no break here as we could have situations similar to '.gz' vs '.tar.gz' here
}
}
if (not AltRes.Filename.empty())
break;
}
if (not AltRes.Filename.empty())
URIDone(Res,&AltRes);
else if (not Res.Filename.empty())
URIDone(Res);
else
{
errno = olderrno;
return _error->Errno(Files[0].c_str(), _("File not found"));
}
return true;
}
/*}}}*/
int main()
{
return FileMethod().Run();
}
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