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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 public:
61     inline AprAutoPool(apr_pool_t *parent = NULL)
62         { pool = svn_pool_create(parent); }
63     inline ~AprAutoPool()
64         { svn_pool_destroy(pool); }
65
66     inline apr_pool_t *data() const { return pool; }
67     inline operator apr_pool_t *() const { return pool; }
68 };
69
70 class SvnPrivate
71 {
72 public:
73     MatchRuleList matchRules;
74     RepositoryHash repositories;
75     IdentityHash identities;
76
77     SvnPrivate(const QString &pathToRepository);
78     ~SvnPrivate();
79     int youngestRevision();
80     int exportRevision(int revnum);
81
82     int openRepository(const QString &pathToRepository);
83
84 private:
85     AprAutoPool global_pool;
86     svn_fs_t *fs;
87     svn_revnum_t youngest_rev;
88 };
89
90 void Svn::initialize()
91 {
92     // initialize APR or exit
93     if (apr_initialize() != APR_SUCCESS) {
94         fprintf(stderr, "You lose at apr_initialize().\n");
95         exit(1);
96     }
97
98     // static destructor
99     static struct Destructor { ~Destructor() { apr_terminate(); } } destructor;
100 }
101
102 Svn::Svn(const QString &pathToRepository)
103     : d(new SvnPrivate(pathToRepository))
104 {
105 }
106
107 Svn::~Svn()
108 {
109     delete d;
110 }
111
112 void Svn::setMatchRules(const MatchRuleList &matchRules)
113 {
114     d->matchRules = matchRules;
115 }
116
117 void Svn::setRepositories(const RepositoryHash &repositories)
118 {
119     d->repositories = repositories;
120 }
121
122 int Svn::youngestRevision()
123 {
124     return d->youngestRevision();
125 }
126
127 bool Svn::exportRevision(int revnum)
128 {
129     return d->exportRevision(revnum) == EXIT_SUCCESS;
130 }
131
132 SvnPrivate::SvnPrivate(const QString &pathToRepository)
133     : global_pool(NULL)
134 {
135     openRepository(pathToRepository);
136
137     // get the youngest revision
138     svn_fs_youngest_rev(&youngest_rev, fs, global_pool);
139 }
140
141 SvnPrivate::~SvnPrivate()
142 {
143     svn_pool_destroy(global_pool);
144 }
145
146 int SvnPrivate::youngestRevision()
147 {
148     return youngest_rev;
149 }
150
151 int SvnPrivate::openRepository(const QString &pathToRepository)
152 {
153     svn_repos_t *repos;
154     SVN_ERR(svn_repos_open(&repos, QFile::encodeName(pathToRepository), global_pool));
155     fs = svn_repos_fs(repos);
156
157     return EXIT_SUCCESS;
158 }
159
160 static int pathMode(svn_fs_root_t *fs_root, const char *pathname, apr_pool_t *pool)
161 {
162     svn_string_t *propvalue;
163     SVN_ERR(svn_fs_node_prop(&propvalue, fs_root, pathname, "svn:executable", pool));
164     int mode = 0100644;
165     if (propvalue)
166         mode = 0100755;
167
168     // maybe it's a symlink?
169     SVN_ERR(svn_fs_node_prop(&propvalue, fs_root, pathname, "svn:special", pool));
170     if (strcmp(propvalue->data, "symlink") == 0)
171         mode = 0120000;
172
173     return mode;
174 }
175
176 svn_error_t *QIODevice_write(void *baton, const char *data, apr_size_t *len)
177 {
178     QIODevice *device = reinterpret_cast<QIODevice *>(baton);
179     device->write(data, *len);
180     return SVN_NO_ERROR;
181 }
182
183 static svn_stream_t *streamForDevice(QIODevice *device, apr_pool_t *pool)
184 {
185     svn_stream_t *stream = svn_stream_create(device, pool);
186     svn_stream_set_write(stream, QIODevice_write);
187
188     return stream;
189 }
190
191 static int dumpBlob(Repository::Transaction *txn, svn_fs_root_t *fs_root,
192                     const char *pathname, apr_pool_t *pool)
193 {
194     // what type is it?
195     int mode = pathMode(fs_root, pathname, pool);
196
197     svn_stream_t *in_stream, *out_stream;
198     svn_filesize_t stream_length;
199
200     SVN_ERR(svn_fs_file_length(&stream_length, fs_root, pathname, pool));
201     QIODevice *io = txn->addFile(pathname, mode, stream_length);
202
203     // open the file
204     SVN_ERR(svn_fs_file_contents(&in_stream, fs_root, pathname, pool));
205
206     // open a generic svn_stream_t for the QIODevice
207     out_stream = streamForDevice(io, pool);
208     SVN_ERR(svn_stream_copy(in_stream, out_stream, pool));
209
210     return EXIT_SUCCESS;
211 }
212
213 time_t get_epoch(char *svn_date)
214 {
215     struct tm tm;
216     memset(&tm, 0, sizeof tm);
217     QByteArray date(svn_date, strlen(svn_date) - 8);
218     strptime(date, "%Y-%m-%dT%H:%M:%S", &tm);
219     return mktime(&tm);
220 }
221
222 int SvnPrivate::exportRevision(int revnum)
223 {
224     AprAutoPool pool(global_pool);
225
226     // open this revision:
227     svn_fs_root_t *fs_root;
228     SVN_ERR(svn_fs_revision_root(&fs_root, fs, revnum, pool));
229     qDebug() << "Exporting revision" << revnum;
230
231     // find out what was changed in this revision:
232     QHash<QString, Repository::Transaction *> transactions;
233     apr_hash_t *changes;
234     SVN_ERR(svn_fs_paths_changed(&changes, fs_root, pool));
235     AprAutoPool revpool(pool);
236     for (apr_hash_index_t *i = apr_hash_first(pool, changes); i; i = apr_hash_next(i)) {
237         svn_pool_clear(revpool);
238
239         const void *vkey;
240         void *value;
241         apr_hash_this(i, &vkey, NULL, &value);
242         const char *key = reinterpret_cast<const char *>(vkey);
243
244         // is this a directory?
245         svn_boolean_t is_dir;
246         SVN_ERR(svn_fs_is_dir(&is_dir, fs_root, key, revpool));
247         if (is_dir)
248             continue;           // Git doesn't handle directories, so we don't either
249
250         QString current = QString::fromUtf8(key);
251
252         // find the first rule that matches this pathname
253         bool foundMatch = false;
254         foreach (Rules::Match rule, matchRules)
255             if (rule.rx.exactMatch(current)) {
256                 foundMatch = true;
257                 QString repository = current;
258                 QString branch = current;
259                 QString path = current;
260
261                 // do the replacement
262                 repository.replace(rule.rx, rule.repository);
263                 branch.replace(rule.rx, rule.branch);
264                 path.replace(rule.rx, rule.path);
265
266                 qDebug() << "..." << current << "->"
267                          << repository << branch << path;
268
269                 Repository::Transaction *txn = transactions.value(repository, 0);
270                 if (!txn) {
271                     Repository *repo = repositories.value(repository, 0);
272                     if (!repo) {
273                         qCritical() << "Rule" << rule.rx.pattern()
274                                     << "references unknown repository" << repository;
275                         return EXIT_FAILURE;
276                     }
277
278                     QString svnprefix = current;
279                     if (current.endsWith(path))
280                         current.chop(path.length());
281
282                     txn = repo->newTransaction(branch, svnprefix, revnum);
283                     if (!txn)
284                         return EXIT_FAILURE;
285
286                     transactions.insert(repository, txn);
287                 }
288
289                 svn_fs_path_change_t *change = reinterpret_cast<svn_fs_path_change_t *>(value);
290                 if (change->change_kind == svn_fs_path_change_delete)
291                     txn->deleteFile(path);
292                 else
293                     dumpBlob(txn, fs_root, key, revpool);
294
295                 break;
296             }
297
298         if (!foundMatch) {
299             qCritical() << current << "did not match any rules; cannot continue";
300             return EXIT_FAILURE;
301         }
302     }
303     svn_pool_clear(revpool);
304
305     if (transactions.isEmpty())
306         return true;            // no changes?
307
308     // now create the commit
309     apr_hash_t *revprops;
310     SVN_ERR(svn_fs_revision_proplist(&revprops, fs, revnum, pool));
311     svn_string_t *svnauthor = (svn_string_t*)apr_hash_get(revprops, "svn:author", APR_HASH_KEY_STRING);
312     svn_string_t *svndate = (svn_string_t*)apr_hash_get(revprops, "svn:date", APR_HASH_KEY_STRING);
313     svn_string_t *svnlog = (svn_string_t*)apr_hash_get(revprops, "svn:log", APR_HASH_KEY_STRING);
314
315     QByteArray log = (char *)svnlog->data;
316     QByteArray authorident = identities.value((char *)svnauthor->data);
317     time_t epoch = get_epoch((char*)svndate->data);
318     if (authorident.isEmpty()) {
319         if (!svnauthor || svn_string_isempty(svnauthor))
320             authorident = "nobody <nobody@localhost>";
321         else
322             authorident = svnauthor->data + QByteArray(" <") +
323                           svnauthor->data + QByteArray("@localhost>");
324     }
325
326     foreach (Repository::Transaction *txn, transactions) {
327         txn->setAuthor(authorident);
328         txn->setDateTime(epoch);
329         txn->setLog(log);
330
331         txn->commit();
332         delete txn;
333     }
334
335     return EXIT_SUCCESS;
336 }
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