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Beautify the rule debug output
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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;
290         if (finalPathName.isEmpty())
291             entryFinalName = dirent->name;
292         else
293             entryFinalName = finalPathName + '/' + dirent->name;
294
295         if (dirent->kind == svn_node_dir) {
296             if (recursiveDumpDir(txn, fs_root, entryName, entryFinalName, dirpool) == EXIT_FAILURE)
297                 return EXIT_FAILURE;
298         } else if (dirent->kind == svn_node_file) {
299             printf("+");
300             fflush(stdout);
301             if (dumpBlob(txn, fs_root, entryName, entryFinalName, dirpool) == EXIT_FAILURE)
302                 return EXIT_FAILURE;
303         }
304     }
305
306     return EXIT_SUCCESS;
307 }
308
309 static bool wasDir(svn_fs_t *fs, int revnum, const char *pathname, apr_pool_t *pool)
310 {
311     AprAutoPool subpool(pool);
312     svn_fs_root_t *fs_root;
313     if (svn_fs_revision_root(&fs_root, fs, revnum, subpool) != SVN_NO_ERROR)
314         return false;
315
316     svn_boolean_t is_dir;
317     if (svn_fs_is_dir(&is_dir, fs_root, pathname, subpool) != SVN_NO_ERROR)
318         return false;
319
320     return is_dir;
321 }
322
323 time_t get_epoch(char *svn_date)
324 {
325     struct tm tm;
326     memset(&tm, 0, sizeof tm);
327     QByteArray date(svn_date, strlen(svn_date) - 8);
328     strptime(date, "%Y-%m-%dT%H:%M:%S", &tm);
329     return mktime(&tm);
330 }
331
332 class SvnRevision
333 {
334 public:
335     AprAutoPool pool;
336     QHash<QString, Repository::Transaction *> transactions;
337     MatchRuleList matchRules;
338     RepositoryHash repositories;
339     IdentityHash identities;
340
341     svn_fs_t *fs;
342     svn_fs_root_t *fs_root;
343     int revnum;
344
345     SvnRevision(int revision, svn_fs_t *f, apr_pool_t *parent_pool)
346         : pool(parent_pool), fs(f), fs_root(0), revnum(revision)
347     {
348     }
349
350     int open()
351     {
352         SVN_ERR(svn_fs_revision_root(&fs_root, fs, revnum, pool));
353         return EXIT_SUCCESS;
354     }
355
356     int prepareTransactions();
357     int commit();
358
359     int exportEntry(const char *path, const svn_fs_path_change_t *change);
360     int exportInternal(const char *path, const svn_fs_path_change_t *change,
361                        const char *path_from, svn_revnum_t rev_from,
362                        const QString &current, const Rules::Match &rule);
363     int recurse(const char *path, const svn_fs_path_change_t *change,
364                 const char *path_from, svn_revnum_t rev_from, apr_pool_t *pool);
365 };
366
367 int SvnPrivate::exportRevision(int revnum)
368 {
369     SvnRevision rev(revnum, fs, global_pool);
370     rev.matchRules = matchRules;
371     rev.repositories = repositories;
372     rev.identities = identities;
373
374     // open this revision:
375     printf("Exporting revision %d ", revnum);
376     fflush(stdout);
377
378     if (rev.open() == EXIT_FAILURE)
379         return EXIT_FAILURE;
380
381     if (rev.prepareTransactions() == EXIT_FAILURE)
382         return EXIT_FAILURE;
383
384     if (rev.transactions.isEmpty()) {
385         printf(" nothing to do\n");
386         return EXIT_SUCCESS;    // no changes?
387     }
388
389     if (rev.commit() == EXIT_FAILURE)
390         return EXIT_FAILURE;
391
392     printf(" done\n");
393     return EXIT_SUCCESS;
394 }
395
396 int SvnRevision::prepareTransactions()
397 {
398     // find out what was changed in this revision:
399     apr_hash_t *changes;
400     SVN_ERR(svn_fs_paths_changed(&changes, fs_root, pool));
401     for (apr_hash_index_t *i = apr_hash_first(pool, changes); i; i = apr_hash_next(i)) {
402         const void *vkey;
403         void *value;
404         apr_hash_this(i, &vkey, NULL, &value);
405         const char *key = reinterpret_cast<const char *>(vkey);
406         svn_fs_path_change_t *change = reinterpret_cast<svn_fs_path_change_t *>(value);
407
408         if (exportEntry(key, change) == EXIT_FAILURE)
409             return EXIT_FAILURE;
410     }
411
412     return EXIT_SUCCESS;
413 }
414
415 int SvnRevision::commit()
416 {
417     // now create the commit
418     apr_hash_t *revprops;
419     SVN_ERR(svn_fs_revision_proplist(&revprops, fs, revnum, pool));
420     svn_string_t *svnauthor = (svn_string_t*)apr_hash_get(revprops, "svn:author", APR_HASH_KEY_STRING);
421     svn_string_t *svndate = (svn_string_t*)apr_hash_get(revprops, "svn:date", APR_HASH_KEY_STRING);
422     svn_string_t *svnlog = (svn_string_t*)apr_hash_get(revprops, "svn:log", APR_HASH_KEY_STRING);
423
424     QByteArray log = (char *)svnlog->data;
425     QByteArray authorident = svnauthor ? identities.value((char *)svnauthor->data) : QByteArray();
426     time_t epoch = get_epoch((char*)svndate->data);
427     if (authorident.isEmpty()) {
428         if (!svnauthor || svn_string_isempty(svnauthor))
429             authorident = "nobody <nobody@localhost>";
430         else
431             authorident = svnauthor->data + QByteArray(" <") +
432                           svnauthor->data + QByteArray("@localhost>");
433     }
434
435     foreach (Repository::Transaction *txn, transactions) {
436         txn->setAuthor(authorident);
437         txn->setDateTime(epoch);
438         txn->setLog(log);
439
440         txn->commit();
441         delete txn;
442     }
443
444     return EXIT_SUCCESS;
445 }
446
447 int SvnRevision::exportEntry(const char *key, const svn_fs_path_change_t *change)
448 {
449     AprAutoPool revpool(pool.data());
450     QString current = QString::fromUtf8(key);
451
452     // was this copied from somewhere?
453     svn_revnum_t rev_from;
454     const char *path_from;
455     SVN_ERR(svn_fs_copied_from(&rev_from, &path_from, fs_root, key, revpool));
456
457     // is this a directory?
458     svn_boolean_t is_dir;
459     SVN_ERR(svn_fs_is_dir(&is_dir, fs_root, key, revpool));
460     if (is_dir) {
461         if (path_from == NULL) {
462             // no, it's a new directory being added
463             // Git doesn't handle directories, so we don't either
464             //qDebug() << "   mkdir ignored:" << key;
465             return EXIT_SUCCESS;
466         }
467
468         current += '/';
469         qDebug() << "   " << key << "was copied from" << path_from;
470     }
471
472     // find the first rule that matches this pathname
473     MatchRuleList::ConstIterator match = findMatchRule(matchRules, revnum, current);
474     if (match != matchRules.constEnd()) {
475         const Rules::Match &rule = *match;
476         switch (rule.action) {
477         case Rules::Match::Ignore:
478             // ignore rule
479             qDebug() << "   " << qPrintable(current) << "rev" << revnum
480                      << "-> ignored (rule" << rule << ")";
481             return EXIT_SUCCESS;
482
483         case Rules::Match::Recurse:
484             // recurse rule
485             if (is_dir)
486                 return recurse(key, change, path_from, rev_from, revpool);
487             if (change->change_kind != svn_fs_path_change_delete)
488                 qWarning() << "   recurse rule" << rule
489                            << "applied to non-directory:" << qPrintable(current);
490             return EXIT_SUCCESS;
491
492         case Rules::Match::Export:
493             return exportInternal(key, change, path_from, rev_from, current, rule);
494         }
495     }
496
497     if (is_dir && path_from != NULL) {
498         qDebug() << current << "is a copy-with-history, auto-recursing";
499         return recurse(key, change, path_from, rev_from, revpool);
500     } else if (wasDir(fs, revnum - 1, key, revpool)) {
501         qDebug() << current << "was a directory; ignoring";
502     } else if (change->change_kind == svn_fs_path_change_delete) {
503         qDebug() << current << "is being deleted but I don't know anything about it; ignoring";
504     } else {
505         qCritical() << current << "did not match any rules; cannot continue";
506         return EXIT_FAILURE;
507     }
508
509     return EXIT_SUCCESS;
510 }
511
512 int SvnRevision::exportInternal(const char *key, const svn_fs_path_change_t *change,
513                                 const char *path_from, svn_revnum_t rev_from,
514                                 const QString &current, const Rules::Match &rule)
515 {
516     QString svnprefix, repository, branch, path;
517     splitPathName(rule, current, &svnprefix, &repository, &branch, &path);
518
519     printf(".");
520     fflush(stdout);
521 //                qDebug() << "   " << qPrintable(current) << "rev" << revnum << "->"
522 //                         << qPrintable(repository) << qPrintable(branch) << qPrintable(path);
523
524     if (path.isEmpty() && path_from != NULL) {
525         QString previous = QString::fromUtf8(path_from) + '/';
526         MatchRuleList::ConstIterator prevmatch =
527             findMatchRule(matchRules, rev_from, previous, NoRecurseRule | NoIgnoreRule);
528         if (prevmatch != matchRules.constEnd()) {
529             QString prevsvnprefix, prevrepository, prevbranch, prevpath;
530             splitPathName(*prevmatch, previous, &prevsvnprefix, &prevrepository,
531                           &prevbranch, &prevpath);
532
533             if (!prevpath.isEmpty()) {
534                 qDebug() << qPrintable(current) << "is a partial branch of repository"
535                          << qPrintable(prevrepository) << "branch"
536                          << qPrintable(prevbranch) << "subdir"
537                          << qPrintable(prevpath);
538             } else if (prevrepository != repository) {
539                 qWarning() << qPrintable(current) << "rev" << revnum
540                            << "is a cross-repository copy (from repository"
541                            << qPrintable(prevrepository) << "branch"
542                            << qPrintable(prevbranch) << "path"
543                            << qPrintable(prevpath) << "rev" << rev_from << ")";
544             } else if (prevbranch == branch) {
545                 // same branch and same repository
546                 qDebug() << qPrintable(current) << "rev" << revnum
547                          << "is an SVN rename from"
548                          << qPrintable(previous) << "rev" << rev_from;
549                 return EXIT_SUCCESS;
550             } else {
551                 // same repository but not same branch
552                 // this means this is a plain branch
553                 qDebug() << qPrintable(repository) << ": branch"
554                          << qPrintable(branch) << "is branching from"
555                          << qPrintable(prevbranch);
556
557                 Repository *repo = repositories.value(repository, 0);
558                 if (!repo) {
559                     qCritical() << "Rule" << rule
560                                 << "references unknown repository" << repository;
561                     return EXIT_FAILURE;
562                 }
563
564                 repo->createBranch(branch, revnum, prevbranch, rev_from);
565             }
566         }
567     }
568
569     Repository::Transaction *txn = transactions.value(repository, 0);
570     if (!txn) {
571         Repository *repo = repositories.value(repository, 0);
572         if (!repo) {
573             qCritical() << "Rule" << rule
574                         << "references unknown repository" << repository;
575             return EXIT_FAILURE;
576         }
577
578         txn = repo->newTransaction(branch, svnprefix, revnum);
579         if (!txn)
580             return EXIT_FAILURE;
581
582         transactions.insert(repository, txn);
583     }
584
585     if (change->change_kind == svn_fs_path_change_delete) {
586         txn->deleteFile(path);
587     } else if (!current.endsWith('/')) {
588         dumpBlob(txn, fs_root, key, path, pool);
589     } else {
590         txn->deleteFile(path);
591         recursiveDumpDir(txn, fs_root, key, path, pool);
592     }
593
594     return EXIT_SUCCESS;
595 }
596
597 int SvnRevision::recurse(const char *path, const svn_fs_path_change_t *change,
598                          const char *path_from, svn_revnum_t rev_from,
599                          apr_pool_t *pool)
600 {
601     // get the dir listing
602     apr_hash_t *entries;
603     SVN_ERR(svn_fs_dir_entries(&entries, fs_root, path, pool));
604
605     AprAutoPool dirpool(pool);
606     for (apr_hash_index_t *i = apr_hash_first(pool, entries); i; i = apr_hash_next(i)) {
607         dirpool.clear();
608         const void *vkey;
609         void *value;
610         apr_hash_this(i, &vkey, NULL, &value);
611
612         svn_fs_dirent_t *dirent = reinterpret_cast<svn_fs_dirent_t *>(value);
613         QByteArray entry = path + QByteArray("/") + dirent->name;
614         QByteArray entryFrom;
615         if (path_from)
616             entryFrom = path_from + QByteArray("/") + dirent->name;
617
618         QString current = QString::fromUtf8(entry);
619         if (dirent->kind == svn_node_dir)
620             current += '/';
621
622         // find the first rule that matches this pathname
623         MatchRuleList::ConstIterator match = findMatchRule(matchRules, revnum, current);
624         if (match != matchRules.constEnd()) {
625             if (exportInternal(entry, change, entryFrom.isNull() ? 0 : entryFrom.constData(),
626                                rev_from, current, *match) == EXIT_FAILURE)
627                 return EXIT_FAILURE;
628         } else {
629             qCritical() << current << "did not match any rules; cannot continue";
630             return EXIT_FAILURE;
631         }
632     }
633 }
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