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
|
/*
* headrev.c : print out the HEAD revision of a repository.
*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
* ====================================================================
*
* To compile on unix against Subversion and APR libraries, try
* something like:
*
* cc headrev.c -o headrev \
* -I/usr/local/include/subversion-1 -I/usr/local/apache2/include \
* -L/usr/local/apache2/lib -L/usr/local/lib \
* -lsvn_client-1 -lsvn_ra-1 -lsvn_subr-1 -lapr-0 -laprutil-0
*
*/
#include "svn_client.h"
#include "svn_pools.h"
#include "svn_config.h"
#include "svn_fs.h"
#include "svn_path.h"
#include "svn_cmdline.h"
/* Display a prompt and read a one-line response into the provided buffer,
removing a trailing newline if present. */
static svn_error_t *
prompt_and_read_line(const char *prompt,
char *buffer,
size_t max)
{
int len;
printf("%s: ", prompt);
if (fgets(buffer, max, stdin) == NULL)
return svn_error_create(0, NULL, "error reading stdin");
len = strlen(buffer);
if (len > 0 && buffer[len-1] == '\n')
buffer[len-1] = 0;
return SVN_NO_ERROR;
}
/* A tiny callback function of type 'svn_auth_simple_prompt_func_t'. For
a much better example, see svn_cl__auth_simple_prompt in the official
svn cmdline client. */
static svn_error_t *
my_simple_prompt_callback (svn_auth_cred_simple_t **cred,
void *baton,
const char *realm,
const char *username,
svn_boolean_t may_save,
apr_pool_t *pool)
{
svn_auth_cred_simple_t *ret = apr_pcalloc (pool, sizeof (*ret));
char answerbuf[100];
if (realm)
{
printf ("Authentication realm: %s\n", realm);
}
if (username)
ret->username = apr_pstrdup (pool, username);
else
{
SVN_ERR (prompt_and_read_line("Username", answerbuf, sizeof(answerbuf)));
ret->username = apr_pstrdup (pool, answerbuf);
}
SVN_ERR (prompt_and_read_line("Password", answerbuf, sizeof(answerbuf)));
ret->password = apr_pstrdup (pool, answerbuf);
*cred = ret;
return SVN_NO_ERROR;
}
/* A tiny callback function of type 'svn_auth_username_prompt_func_t'. For
a much better example, see svn_cl__auth_username_prompt in the official
svn cmdline client. */
static svn_error_t *
my_username_prompt_callback (svn_auth_cred_username_t **cred,
void *baton,
const char *realm,
svn_boolean_t may_save,
apr_pool_t *pool)
{
svn_auth_cred_username_t *ret = apr_pcalloc (pool, sizeof (*ret));
char answerbuf[100];
if (realm)
{
printf ("Authentication realm: %s\n", realm);
}
SVN_ERR (prompt_and_read_line("Username", answerbuf, sizeof(answerbuf)));
ret->username = apr_pstrdup (pool, answerbuf);
*cred = ret;
return SVN_NO_ERROR;
}
/* A callback function used when the RA layer needs a handle to a
temporary file. This is a reduced version of the callback used in
the official svn cmdline client. */
static svn_error_t *
open_tmp_file (apr_file_t **fp,
void *callback_baton,
apr_pool_t *pool)
{
const char *path;
const char *ignored_filename;
SVN_ERR (svn_io_temp_dir (&path, pool));
path = svn_path_join (path, "tempfile", pool);
/* Open a unique file, with delete-on-close set. */
SVN_ERR (svn_io_open_unique_file2 (fp, &ignored_filename,
path, ".tmp",
svn_io_file_del_on_close, pool));
return SVN_NO_ERROR;
}
int
main (int argc, const char **argv)
{
apr_pool_t *pool;
svn_error_t *err;
const char *URL;
svn_ra_session_t *session;
svn_ra_callbacks2_t *cbtable;
svn_revnum_t rev;
apr_hash_t *cfg_hash;
svn_auth_baton_t *auth_baton;
if (argc <= 1)
{
printf ("Usage: %s URL\n", argv[0]);
printf (" Print HEAD revision of URL's repository.\n");
return EXIT_FAILURE;
}
else
URL = argv[1];
/* Initialize the app. Send all error messages to 'stderr'. */
if (svn_cmdline_init ("headrev", stderr) != EXIT_SUCCESS)
return EXIT_FAILURE;
/* Create top-level memory pool. Be sure to read the HACKING file to
understand how to properly use/free subpools. */
pool = svn_pool_create (NULL);
/* Initialize the FS library. */
err = svn_fs_initialize (pool);
if (err) goto hit_error;
/* Make sure the ~/.subversion run-time config files exist, and load. */
err = svn_config_ensure (NULL, pool);
if (err) goto hit_error;
err = svn_config_get_config (&cfg_hash, NULL, pool);
if (err) goto hit_error;
/* Build an authentication baton. */
{
/* There are many different kinds of authentication back-end
"providers". See svn_auth.h for a full overview. */
svn_auth_provider_object_t *provider;
apr_array_header_t *providers
= apr_array_make (pool, 4, sizeof (svn_auth_provider_object_t *));
svn_client_get_simple_prompt_provider (&provider,
my_simple_prompt_callback,
NULL, /* baton */
2, /* retry limit */ pool);
APR_ARRAY_PUSH (providers, svn_auth_provider_object_t *) = provider;
svn_client_get_username_prompt_provider (&provider,
my_username_prompt_callback,
NULL, /* baton */
2, /* retry limit */ pool);
APR_ARRAY_PUSH (providers, svn_auth_provider_object_t *) = provider;
/* Register the auth-providers into the context's auth_baton. */
svn_auth_open (&auth_baton, providers, pool);
}
/* Create a table of callbacks for the RA session, mostly nonexistent. */
cbtable = apr_pcalloc (pool, sizeof(*cbtable));
cbtable->auth_baton = auth_baton;
cbtable->open_tmp_file = open_tmp_file;
/* Now do the real work. */
err = svn_ra_open2(&session, URL, cbtable, NULL, cfg_hash, pool);
if (err) goto hit_error;
err = svn_ra_get_latest_revnum(session, &rev, pool);
if (err) goto hit_error;
printf ("The latest revision is %ld.\n", rev);
return EXIT_SUCCESS;
hit_error:
svn_handle_error2 (err, stderr, FALSE, "headrev: ");
return EXIT_FAILURE;
}
|
