File: pkgimport.cc

package info (click to toggle)
apt-cacher-ng 3.3.1-2~bpo10%2B1
  • links: PTS, VCS
  • area: main
  • in suites: buster-backports
  • size: 2,040 kB
  • sloc: cpp: 17,564; sh: 553; ansic: 401; perl: 377; makefile: 126
file content (445 lines) | stat: -rw-r--r-- 10,549 bytes parent folder | download | duplicates (5)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445

#define LOCAL_DEBUG
#include "debug.h"

#include "pkgimport.h"
#include "header.h"
#include "dirwalk.h"
#include "meta.h"
#include "acfg.h"
#include "filereader.h"
#include "dlcon.h"
#include "csmapping.h"

#include <string>
#include <iostream>
#include <fstream>
#include <meta.h>
#include <cstdio>
#include <errno.h>

using namespace std;

#define SCACHEFILE (CACHE_BASE+"_impkeycache")
#define FMTSIG "FMT5"

namespace acng
{
/*
 * Algorithm:
 *
 * Scan the _import directory context and make a dictionary with
 * fingerprint(size, cs) -> (path, bUsed, mtime)
 * in the ProcessRegular callback function
 *
 * Parse the vol. files, do work, and mark used file with bUsed
 *
*/

/*
inline bool IsIndexDiff(const string & sPath)
{
	static tFingerprint fprBuf;
	static string sDiffHint(".diff" SZPATHSEP);
	tStrPos pos;
	return (endsWithSzAr(sPath,".gz") && (sPath.find(sDiffHint) != stmiss || (stmiss != (pos
			= sPath.rfind(SZPATHSEP "20")) && sPath.find_first_not_of("0123456789.-", pos + 3)
			== sPath.size() - 2)));
}
*/

bool pkgimport::ProcessRegular(const mstring &sPath, const struct stat &stinfo)
{
	if(CheckStopSignal()) return false;

	if(endsWithSzAr(sPath, ".head"))
		return true;

	if(sPath.size()<=CACHE_BASE_LEN) // heh?
		return false;
	
	if(m_bLookForIFiles)
	{
		ProgTell();

		if(0==sPath.compare(CACHE_BASE_LEN, 1, "_"))
			return true; // not for us, also excludes _import

		AddIFileCandidate(sPath.substr(CACHE_BASE_LEN));
	}
	else if(rex::FILE_INVALID != rex::GetFiletype(sPath))
	{
		// get a fingerprint by checksumming if not already there from the fpr cache

		if(m_precachedList.find(sPath)!=m_precachedList.end())
			return true; // have that already, somewhere...
		
		for (CSTYPES ctp : { CSTYPE_MD5, CSTYPE_SHA1, CSTYPE_SHA512 } )
		{

			// get the most likely requested contents id
			tFingerprint fpr;
			/*	if ( (IsIndexDiff(sPath) && fpr.ScanFile(sPath, CSTYPE_SHA1, true))
			 || (!IsIndexDiff(sPath) && fpr.ScanFile(sPath, CSTYPE_MD5, false)))
			 */
			if (!fpr.ScanFile(sPath, ctp, false, nullptr))
			{
				SendFmt << "<span class=\"ERROR\">Error checking " << sPath << "</span>\n<br>\n";
				continue;
			}
			if (fpr.size < 50)
			{
				// ultra small files, looking like garbage (gz'ed empfy file, ...)
				continue;
			}

			SendFmt << "<font color=blue>Checked " << sPath << " (" << GetCsName(ctp)
					<< " fingerprint created)</font><br>\n";

			// add this entry immediately if needed and get its reference
			tImpFileInfo & node = m_importMap[fpr];
			if (node.sPath.empty())
			{ // fresh, just added to the map
				node.sPath = sPath;
				node.mtime = stinfo.st_mtime;
			}
			else if (node.sPath != sPath)
			{
				SendFmt << "<span class=\"WARNING\">Duplicate found, " << sPath << " vs. "
						<< node.sPath << ", ignoring new entry.</span>\n<br>\n";
				m_importRest.emplace_back(fpr, tImpFileInfo(sPath, stinfo.st_mtime));
			}
		}
	}
	else
	{
		if(m_bVerbose)
			SendFmt << "<span class=\"WARNING\">File type unknown, skipping "+sPath << "</span>\n<br>\n";
	}
	return true;
}

bool LinkOrCopy(const std::string &from, const std::string &to)
{
	mkbasedir(to);
	
	//ldbg("Moving " <<from<< " to " << to);
	
	// hardlinks don't work with symlinks properly, create a similar symlink then
	struct stat stinfo, toinfo;
	
	if(0==lstat(from.c_str(), &stinfo) && S_ISLNK(stinfo.st_mode))
	{
		char buf[PATH_MAX+1];
		buf[PATH_MAX]=0x0;
		
		if (!realpath(from.c_str(), buf))
			return false;

		::unlink(to.c_str());
		return (0==symlink(buf, to.c_str()));		
	}
	else
	{
		if(0!=stat(from.c_str(), &stinfo))
				return false;
		
		if(0==stat(to.c_str(), &toinfo))
		{
			// same file, don't care
			if(stinfo.st_dev==toinfo.st_dev && stinfo.st_ino == toinfo.st_ino)
				return true;
			
			// unlink, this file must go. If that fails, we have weird permissions anyway.
			if(0!=unlink(to.c_str()))
				return false;
		}
		if (0==link(from.c_str(), to.c_str()))
			return true;

		if(!FileCopy(from,to))
			return false;
		
		// make sure the copy is ok
		return (0 == stat(from.c_str(), &stinfo) 
				&& 0 == stat(to.c_str(), &toinfo)
				&& toinfo.st_size==stinfo.st_size);
		
	}

	return false;
}

			
void pkgimport::Action()
{
// TODO: import path from cmd?
	m_sSrcPath=CACHE_BASE+"_import";
	
	SendFmt << "Importing from " << m_sSrcPath << " directory.<br>Scanning local files...<br>";

	m_bByPath=true; // should act on all locations

	_LoadKeyCache();
	if(!m_precachedList.empty())
		SendChunk( tSS(100)<<"Loaded "<<m_importMap.size()<<
				(m_precachedList.size()==1 ? " entry" : " entries")
				<<" from the fingerprint cache<br>\n");
	
	m_bLookForIFiles=true;

	BuildCacheFileList();
	if(CheckStopSignal()) return;
	
	if(m_metaFilesRel.empty())
	{
		SendChunk("<span class=\"ERROR\">No index files detected. Unable to continue, cannot map files to internal locations.</span>");
		return;
	}


	UpdateVolatileFiles();
	if(CheckStopSignal()) return;
	
	if(m_bErrAbort && m_nErrorCount>0)
	{
		SendChunk(sAbortMsg);
		return;
	}
	
	m_bLookForIFiles=false;
	DBGQLOG("building contents map for " << m_sSrcPath);
	DirectoryWalk(m_sSrcPath, this, true);
	if(CheckStopSignal()) return;
	
	if(m_importMap.empty())
	{
		SendChunk("No appropriate files found in the _import directory.<br>\nDone.<br>\n");
		return;
	}
	
	ProcessSeenIndexFiles([this](const tRemoteFileInfo &e) {
		HandlePkgEntry(e); });

	if(CheckStopSignal()) return;

	ofstream fList;
	fList.open(SCACHEFILE.c_str(), ios::out | ios::trunc);

	if(!fList.is_open())
	{
		unlink(SCACHEFILE.c_str());
		fList.open(SCACHEFILE.c_str(), ios::out| ios::trunc);
	}
	if(!fList.is_open())
		SendChunk("Cannot save fingerprint cache, ignored");
	else
		fList << FMTSIG"\n";
	
	off_t remaining=0;

	for(const auto& fpr2info: m_importMap)
	{
		// delete imported stuff, and cache the fingerprint only when file was deleted
		
		if(fpr2info.second.bFileUsed && 0==unlink(fpr2info.second.sPath.c_str()))
			continue;
		if(!fList.is_open())
			continue;

#define ENDL "\n" // don't flush all the time
		fList << fpr2info.first.size << ENDL
				<< (int)fpr2info.first.csType << ENDL
				<< fpr2info.first.GetCsAsString() << ENDL
				<< fpr2info.second.sPath.substr(m_sSrcPath.size()+1) <<ENDL
				<< fpr2info.second.mtime	<<ENDL;

		remaining+=fpr2info.first.size;
	}

	// deal with the rest, never double-examine that stuff
	// copy&paste FTW
	for(const auto& fpr2info : m_importRest)
	{
		fList << fpr2info.first.size << ENDL
				<< (int)fpr2info.first.csType << ENDL
				<< fpr2info.first.GetCsAsString() << ENDL
				<< fpr2info.second.sPath.substr(m_sSrcPath.size()+1) <<ENDL
				<< fpr2info.second.mtime	<<ENDL;
		remaining+=fpr2info.first.size;
	}
	fList.flush();
	fList.close();

	PrintStats("Imported data, per target");

	int n=(m_importMap.size()+m_importRest.size());
	if(n)
		SendFmt << "\n<br>" << n << (n==1 ? " file (" : " files (")
		<< offttosH(remaining) << ") left behind";
}

void pkgimport::HandlePkgEntry(const tRemoteFileInfo &entry)
{
	//typedef std::map<tFingerprint, tImpFileInfo, ltfingerprint> tImportMap;
	auto hit = m_importMap.find(entry.fpr);
	if (hit==m_importMap.end())
		return;
	
	string sDestAbs=CACHE_BASE;
	if(cfg::stupidfs)
		sDestAbs+=DosEscape(entry.sDirectory+entry.sFileName);
	else
		sDestAbs+=(entry.sDirectory+entry.sFileName);

	string sDestHeadAbs=sDestAbs+".head";
	cmstring& sFromAbs=hit->second.sPath;

	SendChunk(string("<font color=green>HIT: ")+sFromAbs
			+ "<br>\nDESTINATION: "+sDestAbs+"</font><br>\n");

	// linking and moving would shred them when the link leads to the same target
	struct stat tmp1, tmp2;

	if (0==stat(sDestAbs.c_str(), &tmp1) && 0==stat(sFromAbs.c_str(), &tmp2)
			&& tmp1.st_ino==tmp2.st_ino&& tmp1.st_dev==tmp2.st_dev)
	{
		//cerr << "Same target file, ignoring."<<endl;
		hit->second.bFileUsed=true;
		SendChunk("<span class=\"WARNING\">Same file exists</span><br>\n");
		if(0!=access(sDestHeadAbs.c_str(), F_OK))
		{
			SendChunk("<span class=\"WARNING\">Header is missing, will recreate...</span>\n<br>\n");
			goto gen_header;
		}
		return;
	}

	unlink(sDestAbs.c_str());

	// XXX: maybe use inject instead

	if (!LinkOrCopy(sFromAbs, sDestAbs))
	{
		SendChunk("<span class=\"ERROR\">ERROR: couldn't link or copy file.</span>\n<br>\n");
		return;
	}

	gen_header:
	unlink(sDestHeadAbs.c_str());

	header h;
	h.frontLine="HTTP/1.1 200 OK";
	/*
	if(entry.fpr.bUnpack)
	{
		static struct stat stbuf;
		if(0!=stat(sFrom.c_str(), &stbuf))
			return; // weird...
		h.set(header::CONTENT_LENGTH, stbuf.st_size);
	}
	else
	*/
		h.set(header::CONTENT_LENGTH, entry.fpr.size);
	
	h.type=header::ANSWER;
	if (h.StoreToFile(sDestAbs+".head")<=0)
	{
		log::err("Unable to store generated header");
		return; // junk may remain but that's a job for cleanup later
	}
	hit->second.bFileUsed=true;

	SetFlags(m_processedIfile).space+=entry.fpr.size;
}


void pkgimport::_LoadKeyCache()
{
	std::ifstream in;

	tImpFileInfo info;
	tFingerprint fpr;
	
	in.open(SCACHEFILE.c_str());
	string cs;
	if(!in.is_open())
		return;

	std::getline(in, cs);
	if(cs!=FMTSIG)
		return;

/*	if(m_bVerbose)
		SendChunk("Loading fingerprints from key cache... \n");
		*/
	int csType(CSTYPE_INVALID);

	for(;;)
	{
		info.bFileUsed=false;

		std::getline(in, cs);
		if((fpr.size=atoofft(cs.c_str(), -2)) < 0)
			return;
		in>>csType;
		std::getline(in, cs); // newline

		std::getline(in, cs); // checksum line
		if(!fpr.SetCs(cs, (CSTYPES)csType))
			return;

		std::getline(in, info.sPath);
		info.sPath.insert(0, m_sSrcPath+SZPATHSEP);

		in>>info.mtime;
		std::getline(in, cs); // newline

#ifdef DEBUG_FLAGS
		bool bNix=(stmiss != info.sPath.find("cabextract"));
#endif

		struct stat stbuf;
		if(0==stat(info.sPath.c_str(), &stbuf) 
				&& info.mtime==stbuf.st_mtime)
		{
			m_importMap[fpr]=info;
			m_precachedList.insert(info.sPath);
		}
		
		if(in.eof() || in.fail())
			break;
	}
	/*
	 *
	 if(m_bVerbose)
		SendChunk(ltos(m_importMap.size())+" entries<br>\n");
		*/
}

/*
bool pkgimport::ProcessOthers(const mstring& sPath, const struct stat&)
{
	if(S_ISLNK())
}

void tFInfo::Dump(FILE *fh, const string & second)
{
	fprintf(fh, "%s;%lu;%lu\n%s\n", sPath.c_str(), nSize, nTime, second.c_str());
}

void pkgimport::_GetCachedKey(const string & sPath, const struct stat &stinfo, string &out)
{
	char buf[PATH_MAX+5+3*sizeof(unsigned long)];
	sprintf(buf, "%s\n%lu\n%lu\n", sPath.c_str(), (unsigned long) stinfo.st_size,
			(unsigned long) stinfo.st_mtime);
	tStringMap::const_iterator it=m_cacheMap.find(buf);
	if(it==m_cacheMap.end())
		out.clear();
	else
		out=it->second;
}

 */

}