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1 /*
2  *  Copyright (C) 2007  Thiago Macieira <thiago@kde.org>
3  *
4  *  This program is free software: you can redistribute it and/or modify
5  *  it under the terms of the GNU General Public License as published by
6  *  the Free Software Foundation, either version 2 of the License, or
7  *  (at your option) any later version.
8  *
9  *  This program is distributed in the hope that it will be useful,
10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  *  GNU General Public License for more details.
13  *
14  *  You should have received a copy of the GNU General Public License
15  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
16  */
17
18 /*
19  * Based on svn-fast-export by Chris Lee <clee@kde.org>
20  * License: MIT <http://www.opensource.org/licenses/mit-license.php>
21  * URL: git://repo.or.cz/fast-import.git http://repo.or.cz/w/fast-export.git
22  */
23
24 #define _XOPEN_SOURCE
25 #define _LARGEFILE_SUPPORT
26 #define _LARGEFILE64_SUPPORT
27
28 #include "svn.h"
29
30 #include <unistd.h>
31 #include <string.h>
32 #include <stdio.h>
33 #include <time.h>
34 #include <unistd.h>
35
36 #include <apr_lib.h>
37 #include <apr_getopt.h>
38 #include <apr_general.h>
39
40 #include <svn_fs.h>
41 #include <svn_pools.h>
42 #include <svn_repos.h>
43 #include <svn_types.h>
44
45 #include <QFile>
46 #include <QDebug>
47
48 #include "repository.h"
49
50 #undef SVN_ERR
51 #define SVN_ERR(expr) SVN_INT_ERR(expr)
52
53 typedef QList<Rules::Match> MatchRuleList;
54 typedef QHash<QString, Repository *> RepositoryHash;
55 typedef QHash<QByteArray, QByteArray> IdentityHash;
56
57 class AprAutoPool
58 {
59     apr_pool_t *pool;
60     AprAutoPool(const AprAutoPool &);
61     AprAutoPool &operator=(const AprAutoPool &);
62 public:
63     inline AprAutoPool(apr_pool_t *parent = NULL)
64         { pool = svn_pool_create(parent); }
65     inline ~AprAutoPool()
66         { svn_pool_destroy(pool); }
67
68     inline void clear() { svn_pool_clear(pool); }
69     inline apr_pool_t *data() const { return pool; }
70     inline operator apr_pool_t *() const { return pool; }
71 };
72
73 class SvnPrivate
74 {
75 public:
76     MatchRuleList matchRules;
77     RepositoryHash repositories;
78     IdentityHash identities;
79
80     SvnPrivate(const QString &pathToRepository);
81     ~SvnPrivate();
82     int youngestRevision();
83     int exportRevision(int revnum);
84
85     int openRepository(const QString &pathToRepository);
86
87 private:
88     AprAutoPool global_pool;
89     svn_fs_t *fs;
90     svn_revnum_t youngest_rev;
91 };
92
93 void Svn::initialize()
94 {
95     // initialize APR or exit
96     if (apr_initialize() != APR_SUCCESS) {
97         fprintf(stderr, "You lose at apr_initialize().\n");
98         exit(1);
99     }
100
101     // static destructor
102     static struct Destructor { ~Destructor() { apr_terminate(); } } destructor;
103 }
104
105 Svn::Svn(const QString &pathToRepository)
106     : d(new SvnPrivate(pathToRepository))
107 {
108 }
109
110 Svn::~Svn()
111 {
112     delete d;
113 }
114
115 void Svn::setMatchRules(const MatchRuleList &matchRules)
116 {
117     d->matchRules = matchRules;
118 }
119
120 void Svn::setRepositories(const RepositoryHash &repositories)
121 {
122     d->repositories = repositories;
123 }
124
125 int Svn::youngestRevision()
126 {
127     return d->youngestRevision();
128 }
129
130 bool Svn::exportRevision(int revnum)
131 {
132     return d->exportRevision(revnum) == EXIT_SUCCESS;
133 }
134
135 SvnPrivate::SvnPrivate(const QString &pathToRepository)
136     : global_pool(NULL)
137 {
138     openRepository(pathToRepository);
139
140     // get the youngest revision
141     svn_fs_youngest_rev(&youngest_rev, fs, global_pool);
142 }
143
144 SvnPrivate::~SvnPrivate()
145 {
146     svn_pool_destroy(global_pool);
147 }
148
149 int SvnPrivate::youngestRevision()
150 {
151     return youngest_rev;
152 }
153
154 int SvnPrivate::openRepository(const QString &pathToRepository)
155 {
156     svn_repos_t *repos;
157     SVN_ERR(svn_repos_open(&repos, QFile::encodeName(pathToRepository), global_pool));
158     fs = svn_repos_fs(repos);
159
160     return EXIT_SUCCESS;
161 }
162
163 enum RuleType { AnyRule = 0, NoIgnoreRule = 0x01, NoRecurseRule = 0x02 };
164
165 static MatchRuleList::ConstIterator
166 findMatchRule(const MatchRuleList &matchRules, int revnum, const QString &current,
167               int ruleMask = AnyRule)
168 {
169     MatchRuleList::ConstIterator it = matchRules.constBegin(),
170                                 end = matchRules.constEnd();
171     for ( ; it != end; ++it) {
172         if (it->minRevision > revnum)
173             continue;
174         if (it->maxRevision != -1 && it->maxRevision < revnum)
175             continue;
176         if (it->action == Rules::Match::Ignore && ruleMask & NoIgnoreRule)
177             continue;
178         if (it->action == Rules::Match::Recurse && ruleMask & NoRecurseRule)
179             continue;
180         if (it->rx.indexIn(current) == 0)
181             return it;
182     }
183
184     // no match
185     return end;
186 }
187
188 static void splitPathName(const Rules::Match &rule, const QString &pathName, QString *svnprefix_p,
189                           QString *repository_p, QString *branch_p, QString *path_p)
190 {
191     QString svnprefix = pathName;
192     svnprefix.truncate(rule.rx.matchedLength());
193     if (svnprefix_p)
194         *svnprefix_p = svnprefix;
195
196     if (repository_p) {
197         *repository_p = svnprefix;
198         repository_p->replace(rule.rx, rule.repository);
199     }
200
201     if (branch_p) {
202         *branch_p = svnprefix;
203         branch_p->replace(rule.rx, rule.branch);
204     }
205
206     if (path_p)
207         *path_p = pathName.mid(svnprefix.length());
208 }
209
210 static int pathMode(svn_fs_root_t *fs_root, const char *pathname, apr_pool_t *pool)
211 {
212     svn_string_t *propvalue;
213     SVN_ERR(svn_fs_node_prop(&propvalue, fs_root, pathname, "svn:executable", pool));
214     int mode = 0100644;
215     if (propvalue)
216         mode = 0100755;
217
218     // maybe it's a symlink?
219     SVN_ERR(svn_fs_node_prop(&propvalue, fs_root, pathname, "svn:special", pool));
220     if (propvalue && strcmp(propvalue->data, "symlink") == 0)
221         mode = 0120000;
222
223     return mode;
224 }
225
226 svn_error_t *QIODevice_write(void *baton, const char *data, apr_size_t *len)
227 {
228     QIODevice *device = reinterpret_cast<QIODevice *>(baton);
229     device->write(data, *len);
230
231     if (device->bytesToWrite() > 16384)
232         device->waitForBytesWritten(0);
233     return SVN_NO_ERROR;
234 }
235
236 static svn_stream_t *streamForDevice(QIODevice *device, apr_pool_t *pool)
237 {
238     svn_stream_t *stream = svn_stream_create(device, pool);
239     svn_stream_set_write(stream, QIODevice_write);
240
241     return stream;
242 }
243
244 static int dumpBlob(Repository::Transaction *txn, svn_fs_root_t *fs_root,
245                     const char *pathname, const QString &finalPathName, apr_pool_t *pool)
246 {
247     AprAutoPool dumppool(pool);
248     // what type is it?
249     int mode = pathMode(fs_root, pathname, dumppool);
250
251     svn_filesize_t stream_length;
252
253     SVN_ERR(svn_fs_file_length(&stream_length, fs_root, pathname, dumppool));
254     QIODevice *io = txn->addFile(finalPathName, mode, stream_length);
255
256 #ifndef DRY_RUN
257     // open the file
258     svn_stream_t *in_stream, *out_stream;
259     SVN_ERR(svn_fs_file_contents(&in_stream, fs_root, pathname, dumppool));
260
261     // open a generic svn_stream_t for the QIODevice
262     out_stream = streamForDevice(io, dumppool);
263     SVN_ERR(svn_stream_copy(in_stream, out_stream, dumppool));
264
265     // print an ending newline
266     io->putChar('\n');
267 #endif
268
269     return EXIT_SUCCESS;
270 }
271
272 static int recursiveDumpDir(Repository::Transaction *txn, svn_fs_root_t *fs_root,
273                             const QByteArray &pathname, const QString &finalPathName,
274                             apr_pool_t *pool)
275 {
276     // get the dir listing
277     apr_hash_t *entries;
278     SVN_ERR(svn_fs_dir_entries(&entries, fs_root, pathname, pool));
279     AprAutoPool dirpool(pool);
280
281     for (apr_hash_index_t *i = apr_hash_first(pool, entries); i; i = apr_hash_next(i)) {
282         dirpool.clear();
283         const void *vkey;
284         void *value;
285         apr_hash_this(i, &vkey, NULL, &value);
286
287         svn_fs_dirent_t *dirent = reinterpret_cast<svn_fs_dirent_t *>(value);
288         QByteArray entryName = pathname + '/' + dirent->name;
289         QString entryFinalName = finalPathName + dirent->name;
290
291         if (dirent->kind == svn_node_dir) {
292             entryFinalName += '/';
293             if (recursiveDumpDir(txn, fs_root, entryName, entryFinalName, dirpool) == EXIT_FAILURE)
294                 return EXIT_FAILURE;
295         } else if (dirent->kind == svn_node_file) {
296             printf("+");
297             fflush(stdout);
298             if (dumpBlob(txn, fs_root, entryName, entryFinalName, dirpool) == EXIT_FAILURE)
299                 return EXIT_FAILURE;
300         }
301     }
302
303     return EXIT_SUCCESS;
304 }
305
306 static bool wasDir(svn_fs_t *fs, int revnum, const char *pathname, apr_pool_t *pool)
307 {
308     AprAutoPool subpool(pool);
309     svn_fs_root_t *fs_root;
310     if (svn_fs_revision_root(&fs_root, fs, revnum, subpool) != SVN_NO_ERROR)
311         return false;
312
313     svn_boolean_t is_dir;
314     if (svn_fs_is_dir(&is_dir, fs_root, pathname, subpool) != SVN_NO_ERROR)
315         return false;
316
317     return is_dir;
318 }
319
320 time_t get_epoch(char *svn_date)
321 {
322     struct tm tm;
323     memset(&tm, 0, sizeof tm);
324     QByteArray date(svn_date, strlen(svn_date) - 8);
325     strptime(date, "%Y-%m-%dT%H:%M:%S", &tm);
326     return mktime(&tm);
327 }
328
329 class SvnRevision
330 {
331 public:
332     AprAutoPool pool;
333     QHash<QString, Repository::Transaction *> transactions;
334     MatchRuleList matchRules;
335     RepositoryHash repositories;
336     IdentityHash identities;
337
338     svn_fs_t *fs;
339     svn_fs_root_t *fs_root;
340     int revnum;
341
342     SvnRevision(int revision, svn_fs_t *f, apr_pool_t *parent_pool)
343         : pool(parent_pool), fs(f), fs_root(0), revnum(revision)
344     {
345     }
346
347     int open()
348     {
349         SVN_ERR(svn_fs_revision_root(&fs_root, fs, revnum, pool));
350         return EXIT_SUCCESS;
351     }
352
353     int prepareTransactions();
354     int commit();
355
356     int exportEntry(const char *path, const svn_fs_path_change_t *change, apr_hash_t *changes);
357     int exportDispatch(const char *path, const svn_fs_path_change_t *change,
358                        const char *path_from, svn_revnum_t rev_from,
359                        apr_hash_t *changes, const QString &current, const Rules::Match &rule,
360                        apr_pool_t *pool);
361     int exportInternal(const char *path, const svn_fs_path_change_t *change,
362                        const char *path_from, svn_revnum_t rev_from,
363                        const QString &current, const Rules::Match &rule);
364     int recurse(const char *path, const svn_fs_path_change_t *change,
365                 const char *path_from, svn_revnum_t rev_from,
366                 apr_hash_t *changes, apr_pool_t *pool);
367 };
368
369 int SvnPrivate::exportRevision(int revnum)
370 {
371     SvnRevision rev(revnum, fs, global_pool);
372     rev.matchRules = matchRules;
373     rev.repositories = repositories;
374     rev.identities = identities;
375
376     // open this revision:
377     printf("Exporting revision %d ", revnum);
378     fflush(stdout);
379
380     if (rev.open() == EXIT_FAILURE)
381         return EXIT_FAILURE;
382
383     if (rev.prepareTransactions() == EXIT_FAILURE)
384         return EXIT_FAILURE;
385
386     if (rev.transactions.isEmpty()) {
387         printf(" nothing to do\n");
388         return EXIT_SUCCESS;    // no changes?
389     }
390
391     if (rev.commit() == EXIT_FAILURE)
392         return EXIT_FAILURE;
393
394     printf(" done\n");
395     return EXIT_SUCCESS;
396 }
397
398 int SvnRevision::prepareTransactions()
399 {
400     // find out what was changed in this revision:
401     apr_hash_t *changes;
402     SVN_ERR(svn_fs_paths_changed(&changes, fs_root, pool));
403     for (apr_hash_index_t *i = apr_hash_first(pool, changes); i; i = apr_hash_next(i)) {
404         const void *vkey;
405         void *value;
406         apr_hash_this(i, &vkey, NULL, &value);
407         const char *key = reinterpret_cast<const char *>(vkey);
408         svn_fs_path_change_t *change = reinterpret_cast<svn_fs_path_change_t *>(value);
409
410         if (exportEntry(key, change, changes) == EXIT_FAILURE)
411             return EXIT_FAILURE;
412     }
413
414     return EXIT_SUCCESS;
415 }
416
417 int SvnRevision::commit()
418 {
419     // now create the commit
420     apr_hash_t *revprops;
421     SVN_ERR(svn_fs_revision_proplist(&revprops, fs, revnum, pool));
422     svn_string_t *svnauthor = (svn_string_t*)apr_hash_get(revprops, "svn:author", APR_HASH_KEY_STRING);
423     svn_string_t *svndate = (svn_string_t*)apr_hash_get(revprops, "svn:date", APR_HASH_KEY_STRING);
424     svn_string_t *svnlog = (svn_string_t*)apr_hash_get(revprops, "svn:log", APR_HASH_KEY_STRING);
425
426     QByteArray log = (char *)svnlog->data;
427     QByteArray authorident = svnauthor ? identities.value((char *)svnauthor->data) : QByteArray();
428     time_t epoch = get_epoch((char*)svndate->data);
429     if (authorident.isEmpty()) {
430         if (!svnauthor || svn_string_isempty(svnauthor))
431             authorident = "nobody <nobody@localhost>";
432         else
433             authorident = svnauthor->data + QByteArray(" <") +
434                           svnauthor->data + QByteArray("@localhost>");
435     }
436
437     foreach (Repository::Transaction *txn, transactions) {
438         txn->setAuthor(authorident);
439         txn->setDateTime(epoch);
440         txn->setLog(log);
441
442         txn->commit();
443         delete txn;
444     }
445
446     return EXIT_SUCCESS;
447 }
448
449 int SvnRevision::exportEntry(const char *key, const svn_fs_path_change_t *change,
450                              apr_hash_t *changes)
451 {
452     AprAutoPool revpool(pool.data());
453     QString current = QString::fromUtf8(key);
454
455     // was this copied from somewhere?
456     svn_revnum_t rev_from;
457     const char *path_from;
458     SVN_ERR(svn_fs_copied_from(&rev_from, &path_from, fs_root, key, revpool));
459
460     // is this a directory?
461     svn_boolean_t is_dir;
462     SVN_ERR(svn_fs_is_dir(&is_dir, fs_root, key, revpool));
463     if (is_dir) {
464         if (path_from == NULL) {
465             // no, it's a new directory being added
466             // Git doesn't handle directories, so we don't either
467             //qDebug() << "   mkdir ignored:" << key;
468             return EXIT_SUCCESS;
469         }
470
471         current += '/';
472         qDebug() << "   " << key << "was copied from" << path_from;
473     }
474
475     // find the first rule that matches this pathname
476     MatchRuleList::ConstIterator match = findMatchRule(matchRules, revnum, current);
477     if (match != matchRules.constEnd()) {
478         const Rules::Match &rule = *match;
479         return exportDispatch(key, change, path_from, rev_from, changes, current, rule, revpool);
480     }
481
482     if (is_dir && path_from != NULL) {
483         qDebug() << current << "is a copy-with-history, auto-recursing";
484         return recurse(key, change, path_from, rev_from, changes, revpool);
485     } else if (wasDir(fs, revnum - 1, key, revpool)) {
486         qDebug() << current << "was a directory; ignoring";
487     } else if (change->change_kind == svn_fs_path_change_delete) {
488         qDebug() << current << "is being deleted but I don't know anything about it; ignoring";
489     } else {
490         qCritical() << current << "did not match any rules; cannot continue";
491         return EXIT_FAILURE;
492     }
493
494     return EXIT_SUCCESS;
495 }
496
497 int SvnRevision::exportDispatch(const char *key, const svn_fs_path_change_t *change,
498                                 const char *path_from, svn_revnum_t rev_from,
499                                 apr_hash_t *changes, const QString &current,
500                                 const Rules::Match &rule, apr_pool_t *pool)
501 {
502     switch (rule.action) {
503     case Rules::Match::Ignore:
504         // ignore rule
505         qDebug() << "   " << qPrintable(current) << "rev" << revnum
506                  << "-> ignored (rule" << rule << ")";
507         return EXIT_SUCCESS;
508
509     case Rules::Match::Recurse:
510         return recurse(key, change, path_from, rev_from, changes, pool);
511
512     case Rules::Match::Export:
513         return exportInternal(key, change, path_from, rev_from, current, rule);
514     }
515 }
516
517 int SvnRevision::exportInternal(const char *key, const svn_fs_path_change_t *change,
518                                 const char *path_from, svn_revnum_t rev_from,
519                                 const QString &current, const Rules::Match &rule)
520 {
521     QString svnprefix, repository, branch, path;
522     splitPathName(rule, current, &svnprefix, &repository, &branch, &path);
523
524     printf(".");
525     fflush(stdout);
526 //                qDebug() << "   " << qPrintable(current) << "rev" << revnum << "->"
527 //                         << qPrintable(repository) << qPrintable(branch) << qPrintable(path);
528
529     if (path.isEmpty() && path_from != NULL) {
530         QString previous = QString::fromUtf8(path_from) + '/';
531         MatchRuleList::ConstIterator prevmatch =
532             findMatchRule(matchRules, rev_from, previous, NoIgnoreRule);
533         if (prevmatch != matchRules.constEnd()) {
534             QString prevsvnprefix, prevrepository, prevbranch, prevpath;
535             splitPathName(*prevmatch, previous, &prevsvnprefix, &prevrepository,
536                           &prevbranch, &prevpath);
537
538             if (!prevpath.isEmpty()) {
539                 qDebug() << qPrintable(current) << "is a partial branch of repository"
540                          << qPrintable(prevrepository) << "branch"
541                          << qPrintable(prevbranch) << "subdir"
542                          << qPrintable(prevpath);
543             } else if (prevrepository != repository) {
544                 qWarning() << qPrintable(current) << "rev" << revnum
545                            << "is a cross-repository copy (from repository"
546                            << qPrintable(prevrepository) << "branch"
547                            << qPrintable(prevbranch) << "path"
548                            << qPrintable(prevpath) << "rev" << rev_from << ")";
549             } else if (prevbranch == branch) {
550                 // same branch and same repository
551                 qDebug() << qPrintable(current) << "rev" << revnum
552                          << "is an SVN rename from"
553                          << qPrintable(previous) << "rev" << rev_from;
554                 return EXIT_SUCCESS;
555             } else {
556                 // same repository but not same branch
557                 // this means this is a plain branch
558                 qDebug() << qPrintable(repository) << ": branch"
559                          << qPrintable(branch) << "is branching from"
560                          << qPrintable(prevbranch);
561
562                 Repository *repo = repositories.value(repository, 0);
563                 if (!repo) {
564                     qCritical() << "Rule" << rule
565                                 << "references unknown repository" << repository;
566                     return EXIT_FAILURE;
567                 }
568
569                 repo->createBranch(branch, revnum, prevbranch, rev_from);
570                 return EXIT_SUCCESS;
571             }
572         }
573     }
574
575     Repository::Transaction *txn = transactions.value(repository + branch, 0);
576     if (!txn) {
577         Repository *repo = repositories.value(repository, 0);
578         if (!repo) {
579             qCritical() << "Rule" << rule
580                         << "references unknown repository" << repository;
581             return EXIT_FAILURE;
582         }
583
584         txn = repo->newTransaction(branch, svnprefix, revnum);
585         if (!txn)
586             return EXIT_FAILURE;
587
588         transactions.insert(repository + branch, txn);
589     }
590
591     if (change->change_kind == svn_fs_path_change_delete) {
592         txn->deleteFile(path);
593     } else if (!current.endsWith('/')) {
594         dumpBlob(txn, fs_root, key, path, pool);
595     } else {
596         QString pathNoSlash = path;
597         pathNoSlash.chop(1);
598         txn->deleteFile(pathNoSlash);
599         recursiveDumpDir(txn, fs_root, key, path, pool);
600     }
601
602     return EXIT_SUCCESS;
603 }
604
605 int SvnRevision::recurse(const char *path, const svn_fs_path_change_t *change,
606                          const char *path_from, svn_revnum_t rev_from,
607                          apr_hash_t *changes, apr_pool_t *pool)
608 {
609     // get the dir listing
610     apr_hash_t *entries;
611     SVN_ERR(svn_fs_dir_entries(&entries, fs_root, path, pool));
612
613     AprAutoPool dirpool(pool);
614     for (apr_hash_index_t *i = apr_hash_first(pool, entries); i; i = apr_hash_next(i)) {
615         dirpool.clear();
616         const void *vkey;
617         void *value;
618         apr_hash_this(i, &vkey, NULL, &value);
619
620         svn_fs_dirent_t *dirent = reinterpret_cast<svn_fs_dirent_t *>(value);
621         QByteArray entry = path + QByteArray("/") + dirent->name;
622         QByteArray entryFrom;
623         if (path_from)
624             entryFrom = path_from + QByteArray("/") + dirent->name;
625
626         // check if this entry is in the changelist for this revision already
627         if (apr_hash_get(changes, entry.constData(), APR_HASH_KEY_STRING)) {
628             qDebug() << entry << "rev" << revnum
629                      << "is in the change-list, deferring to that one";
630             continue;
631         }
632
633         QString current = QString::fromUtf8(entry);
634         if (dirent->kind == svn_node_dir)
635             current += '/';
636
637         // find the first rule that matches this pathname
638         MatchRuleList::ConstIterator match = findMatchRule(matchRules, revnum, current);
639         if (match != matchRules.constEnd()) {
640             if (exportDispatch(entry, change, entryFrom.isNull() ? 0 : entryFrom.constData(),
641                                rev_from, changes, current, *match, dirpool) == EXIT_FAILURE)
642                 return EXIT_FAILURE;
643         } else {
644             qCritical() << current << "rev" << revnum
645                         << "did not match any rules; cannot continue";
646             return EXIT_FAILURE;
647         }
648     }
649
650     return EXIT_SUCCESS;
651 }
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