1 | /* |
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2 | * deadprops.c: mod_dav_svn dead property provider functions for Subversion |
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3 | * |
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4 | * ==================================================================== |
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5 | * Copyright (c) 2000-2004 CollabNet. All rights reserved. |
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6 | * |
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7 | * This software is licensed as described in the file COPYING, which |
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8 | * you should have received as part of this distribution. The terms |
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9 | * are also available at http://subversion.tigris.org/license-1.html. |
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10 | * If newer versions of this license are posted there, you may use a |
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11 | * newer version instead, at your option. |
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12 | * |
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13 | * This software consists of voluntary contributions made by many |
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14 | * individuals. For exact contribution history, see the revision |
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15 | * history and logs, available at http://subversion.tigris.org/. |
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16 | * ==================================================================== |
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17 | */ |
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18 | |
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19 | #include <apr_hash.h> |
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20 | |
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21 | #include <httpd.h> |
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22 | #include <mod_dav.h> |
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23 | |
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24 | #include "svn_xml.h" |
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25 | #include "svn_pools.h" |
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26 | #include "svn_dav.h" |
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27 | #include "svn_base64.h" |
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28 | #include "svn_props.h" |
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29 | #include "private/svn_log.h" |
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30 | |
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31 | #include "dav_svn.h" |
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32 | |
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33 | |
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34 | struct dav_db { |
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35 | const dav_resource *resource; |
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36 | apr_pool_t *p; |
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37 | |
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38 | /* the resource's properties that we are sequencing over */ |
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39 | apr_hash_t *props; |
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40 | apr_hash_index_t *hi; |
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41 | |
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42 | /* used for constructing repos-local names for properties */ |
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43 | svn_stringbuf_t *work; |
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44 | |
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45 | /* passed to svn_repos_ funcs that fetch revprops. */ |
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46 | svn_repos_authz_func_t authz_read_func; |
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47 | void *authz_read_baton; |
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48 | }; |
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49 | |
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50 | |
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51 | struct dav_deadprop_rollback { |
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52 | dav_prop_name name; |
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53 | svn_string_t value; |
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54 | }; |
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55 | |
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56 | |
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57 | /* retrieve the "right" string to use as a repos path */ |
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58 | static const char * |
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59 | get_repos_path(struct dav_resource_private *info) |
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60 | { |
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61 | return info->repos_path; |
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62 | } |
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63 | |
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64 | |
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65 | /* construct the repos-local name for the given DAV property name */ |
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66 | static void |
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67 | get_repos_propname(dav_db *db, |
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68 | const dav_prop_name *name, |
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69 | const char **repos_propname) |
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70 | { |
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71 | if (strcmp(name->ns, SVN_DAV_PROP_NS_SVN) == 0) |
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72 | { |
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73 | /* recombine the namespace ("svn:") and the name. */ |
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74 | svn_stringbuf_set(db->work, SVN_PROP_PREFIX); |
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75 | svn_stringbuf_appendcstr(db->work, name->name); |
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76 | *repos_propname = db->work->data; |
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77 | } |
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78 | else if (strcmp(name->ns, SVN_DAV_PROP_NS_CUSTOM) == 0) |
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79 | { |
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80 | /* the name of a custom prop is just the name -- no ns URI */ |
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81 | *repos_propname = name->name; |
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82 | } |
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83 | else |
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84 | { |
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85 | *repos_propname = NULL; |
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86 | } |
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87 | } |
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88 | |
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89 | |
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90 | static dav_error * |
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91 | get_value(dav_db *db, const dav_prop_name *name, svn_string_t **pvalue) |
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92 | { |
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93 | const char *propname; |
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94 | svn_error_t *serr; |
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95 | |
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96 | /* get the repos-local name */ |
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97 | get_repos_propname(db, name, &propname); |
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98 | |
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99 | if (propname == NULL) |
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100 | { |
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101 | /* we know these are not present. */ |
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102 | *pvalue = NULL; |
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103 | return NULL; |
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104 | } |
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105 | |
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106 | /* ### if db->props exists, then try in there first */ |
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107 | |
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108 | /* Working Baseline, Baseline, or (Working) Version resource */ |
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109 | if (db->resource->baselined) |
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110 | if (db->resource->type == DAV_RESOURCE_TYPE_WORKING) |
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111 | serr = svn_fs_txn_prop(pvalue, db->resource->info->root.txn, |
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112 | propname, db->p); |
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113 | else |
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114 | serr = svn_repos_fs_revision_prop(pvalue, |
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115 | db->resource->info-> repos->repos, |
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116 | db->resource->info->root.rev, propname, |
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117 | db->authz_read_func, |
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118 | db->authz_read_baton, db->p); |
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119 | else |
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120 | serr = svn_fs_node_prop(pvalue, db->resource->info->root.root, |
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121 | get_repos_path(db->resource->info), |
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122 | propname, db->p); |
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123 | if (serr != NULL) |
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124 | return dav_svn__convert_err(serr, HTTP_INTERNAL_SERVER_ERROR, |
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125 | "could not fetch a property", |
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126 | db->resource->pool); |
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127 | |
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128 | return NULL; |
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129 | } |
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130 | |
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131 | |
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132 | static dav_error * |
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133 | save_value(dav_db *db, const dav_prop_name *name, const svn_string_t *value) |
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134 | { |
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135 | const char *propname; |
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136 | svn_error_t *serr; |
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137 | |
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138 | /* get the repos-local name */ |
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139 | get_repos_propname(db, name, &propname); |
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140 | |
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141 | if (propname == NULL) |
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142 | { |
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143 | if (db->resource->info->repos->autoversioning) |
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144 | /* ignore the unknown namespace of the incoming prop. */ |
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145 | propname = name->name; |
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146 | else |
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147 | return dav_new_error(db->p, HTTP_CONFLICT, 0, |
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148 | "Properties may only be defined in the " |
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149 | SVN_DAV_PROP_NS_SVN " and " SVN_DAV_PROP_NS_CUSTOM |
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150 | " namespaces."); |
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151 | } |
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152 | |
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153 | /* Working Baseline or Working (Version) Resource */ |
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154 | if (db->resource->baselined) |
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155 | if (db->resource->working) |
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156 | serr = svn_repos_fs_change_txn_prop(db->resource->info->root.txn, |
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157 | propname, value, db->resource->pool); |
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158 | else |
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159 | { |
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160 | /* ### VIOLATING deltaV: you can't proppatch a baseline, it's |
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161 | not a working resource! But this is how we currently |
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162 | (hackily) allow the svn client to change unversioned rev |
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163 | props. See issue #916. */ |
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164 | serr = svn_repos_fs_change_rev_prop3 |
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165 | (db->resource->info->repos->repos, |
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166 | db->resource->info->root.rev, |
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167 | db->resource->info->repos->username, |
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168 | propname, value, TRUE, TRUE, |
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169 | db->authz_read_func, |
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170 | db->authz_read_baton, |
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171 | db->resource->pool); |
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172 | |
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173 | /* Tell the logging subsystem about the revprop change. */ |
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174 | dav_svn__operational_log(db->resource->info, |
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175 | svn_log__change_rev_prop( |
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176 | db->resource->info->root.rev, |
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177 | propname, |
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178 | db->resource->pool)); |
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179 | } |
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180 | else |
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181 | serr = svn_repos_fs_change_node_prop(db->resource->info->root.root, |
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182 | get_repos_path(db->resource->info), |
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183 | propname, value, db->resource->pool); |
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184 | if (serr != NULL) |
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185 | return dav_svn__convert_err(serr, HTTP_INTERNAL_SERVER_ERROR, |
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186 | NULL, |
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187 | db->resource->pool); |
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188 | |
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189 | /* a change to the props was made; make sure our cached copy is gone */ |
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190 | db->props = NULL; |
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191 | |
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192 | return NULL; |
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193 | } |
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194 | |
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195 | |
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196 | static dav_error * |
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197 | db_open(apr_pool_t *p, |
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198 | const dav_resource *resource, |
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199 | int ro, |
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200 | dav_db **pdb) |
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201 | { |
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202 | dav_db *db; |
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203 | dav_svn__authz_read_baton *arb; |
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204 | |
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205 | /* Some resource types do not have deadprop databases. Specifically: |
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206 | REGULAR, VERSION, and WORKING resources have them. (SVN does not |
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207 | have WORKSPACE resources, and isn't covered here) */ |
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208 | if (resource->type == DAV_RESOURCE_TYPE_HISTORY |
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209 | || resource->type == DAV_RESOURCE_TYPE_ACTIVITY |
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210 | || resource->type == DAV_RESOURCE_TYPE_PRIVATE) |
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211 | { |
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212 | *pdb = NULL; |
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213 | return NULL; |
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214 | } |
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215 | |
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216 | /* If the DB is being opened R/W, and this isn't a working resource, then |
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217 | we have a problem! */ |
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218 | if (!ro && resource->type != DAV_RESOURCE_TYPE_WORKING) |
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219 | { |
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220 | /* ### Exception: in violation of deltaV, we *are* allowing a |
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221 | baseline resource to receive a proppatch, as a way of |
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222 | changing unversioned rev props. Remove this someday: see IZ #916. */ |
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223 | if (! (resource->baselined |
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224 | && resource->type == DAV_RESOURCE_TYPE_VERSION)) |
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225 | return dav_new_error(p, HTTP_CONFLICT, 0, |
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226 | "Properties may only be changed on working " |
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227 | "resources."); |
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228 | } |
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229 | |
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230 | db = apr_pcalloc(p, sizeof(*db)); |
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231 | |
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232 | db->resource = resource; |
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233 | db->p = svn_pool_create(p); |
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234 | |
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235 | /* ### temp hack */ |
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236 | db->work = svn_stringbuf_ncreate("", 0, db->p); |
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237 | |
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238 | /* make our path-based authz callback available to svn_repos_* funcs. */ |
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239 | arb = apr_pcalloc(p, sizeof(*arb)); |
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240 | arb->r = resource->info->r; |
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241 | arb->repos = resource->info->repos; |
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242 | db->authz_read_baton = arb; |
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243 | db->authz_read_func = dav_svn__authz_read_func(arb); |
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244 | |
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245 | /* ### use RO and node's mutable status to look for an error? */ |
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246 | |
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247 | *pdb = db; |
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248 | |
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249 | return NULL; |
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250 | } |
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251 | |
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252 | |
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253 | static void |
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254 | db_close(dav_db *db) |
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255 | { |
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256 | svn_pool_destroy(db->p); |
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257 | } |
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258 | |
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259 | |
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260 | static dav_error * |
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261 | db_define_namespaces(dav_db *db, dav_xmlns_info *xi) |
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262 | { |
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263 | dav_xmlns_add(xi, "S", SVN_DAV_PROP_NS_SVN); |
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264 | dav_xmlns_add(xi, "C", SVN_DAV_PROP_NS_CUSTOM); |
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265 | dav_xmlns_add(xi, "V", SVN_DAV_PROP_NS_DAV); |
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266 | |
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267 | /* ### we don't have any other possible namespaces right now. */ |
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268 | |
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269 | return NULL; |
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270 | } |
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271 | |
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272 | static dav_error * |
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273 | db_output_value(dav_db *db, |
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274 | const dav_prop_name *name, |
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275 | dav_xmlns_info *xi, |
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276 | apr_text_header *phdr, |
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277 | int *found) |
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278 | { |
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279 | const char *prefix; |
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280 | const char *s; |
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281 | svn_string_t *propval; |
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282 | dav_error *err; |
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283 | apr_pool_t *pool = db->resource->pool; |
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284 | |
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285 | if ((err = get_value(db, name, &propval)) != NULL) |
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286 | return err; |
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287 | |
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288 | /* return whether the prop was found, then punt or handle it. */ |
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289 | *found = (propval != NULL); |
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290 | if (propval == NULL) |
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291 | return NULL; |
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292 | |
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293 | if (strcmp(name->ns, SVN_DAV_PROP_NS_CUSTOM) == 0) |
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294 | prefix = "C:"; |
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295 | else |
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296 | prefix = "S:"; |
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297 | |
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298 | if (propval->len == 0) |
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299 | { |
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300 | /* empty value. add an empty elem. */ |
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301 | s = apr_psprintf(pool, "<%s%s/>" DEBUG_CR, prefix, name->name); |
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302 | apr_text_append(pool, phdr, s); |
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303 | } |
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304 | else |
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305 | { |
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306 | /* add <prefix:name [V:encoding="base64"]>value</prefix:name> */ |
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307 | const char *xml_safe; |
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308 | const char *encoding = ""; |
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309 | |
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310 | /* Ensure XML-safety of our property values before sending them |
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311 | across the wire. */ |
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312 | if (! svn_xml_is_xml_safe(propval->data, propval->len)) |
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313 | { |
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314 | const svn_string_t *enc_propval |
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315 | = svn_base64_encode_string2(propval, TRUE, pool); |
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316 | xml_safe = enc_propval->data; |
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317 | encoding = apr_pstrcat(pool, " V:encoding=\"base64\"", NULL); |
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318 | } |
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319 | else |
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320 | { |
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321 | svn_stringbuf_t *xmlval = NULL; |
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322 | svn_xml_escape_cdata_string(&xmlval, propval, pool); |
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323 | xml_safe = xmlval->data; |
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324 | } |
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325 | |
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326 | s = apr_psprintf(pool, "<%s%s%s>", prefix, name->name, encoding); |
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327 | apr_text_append(pool, phdr, s); |
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328 | |
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329 | /* the value is in our pool which means it has the right lifetime. */ |
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330 | /* ### at least, per the current mod_dav architecture/API */ |
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331 | apr_text_append(pool, phdr, xml_safe); |
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332 | |
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333 | s = apr_psprintf(pool, "</%s%s>" DEBUG_CR, prefix, name->name); |
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334 | apr_text_append(pool, phdr, s); |
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335 | } |
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336 | |
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337 | return NULL; |
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338 | } |
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339 | |
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340 | |
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341 | static dav_error * |
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342 | db_map_namespaces(dav_db *db, |
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343 | const apr_array_header_t *namespaces, |
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344 | dav_namespace_map **mapping) |
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345 | { |
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346 | /* we don't need a namespace mapping right now. nothing to do */ |
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347 | return NULL; |
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348 | } |
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349 | |
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350 | |
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351 | static dav_error * |
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352 | db_store(dav_db *db, |
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353 | const dav_prop_name *name, |
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354 | const apr_xml_elem *elem, |
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355 | dav_namespace_map *mapping) |
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356 | { |
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357 | const svn_string_t *propval; |
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358 | apr_pool_t *pool = db->p; |
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359 | apr_xml_attr *attr = elem->attr; |
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360 | |
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361 | /* SVN sends property values as a big blob of bytes. Thus, there should be |
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362 | no child elements of the property-name element. That also means that |
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363 | the entire contents of the blob is located in elem->first_cdata. The |
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364 | dav_xml_get_cdata() will figure it all out for us, but (normally) it |
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365 | should be awfully fast and not need to copy any data. */ |
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366 | |
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367 | propval = svn_string_create |
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368 | (dav_xml_get_cdata(elem, pool, 0 /* strip_white */), pool); |
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369 | |
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370 | /* Check for special encodings of the property value. */ |
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371 | while (attr) |
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372 | { |
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373 | if (strcmp(attr->name, "encoding") == 0) /* ### namespace check? */ |
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374 | { |
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375 | const char *enc_type = attr->value; |
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376 | |
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377 | /* Handle known encodings here. */ |
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378 | if (enc_type && (strcmp(enc_type, "base64") == 0)) |
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379 | propval = svn_base64_decode_string(propval, pool); |
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380 | else |
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381 | return dav_new_error(pool, HTTP_INTERNAL_SERVER_ERROR, 0, |
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382 | "Unknown property encoding"); |
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383 | break; |
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384 | } |
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385 | /* Next attribute, please. */ |
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386 | attr = attr->next; |
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387 | } |
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388 | |
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389 | return save_value(db, name, propval); |
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390 | } |
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391 | |
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392 | |
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393 | static dav_error * |
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394 | db_remove(dav_db *db, const dav_prop_name *name) |
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395 | { |
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396 | svn_error_t *serr; |
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397 | const char *propname; |
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398 | |
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399 | /* get the repos-local name */ |
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400 | get_repos_propname(db, name, &propname); |
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401 | |
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402 | /* ### non-svn props aren't in our repos, so punt for now */ |
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403 | if (propname == NULL) |
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404 | return NULL; |
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405 | |
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406 | /* Working Baseline or Working (Version) Resource */ |
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407 | if (db->resource->baselined) |
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408 | if (db->resource->working) |
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409 | serr = svn_repos_fs_change_txn_prop(db->resource->info->root.txn, |
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410 | propname, NULL, db->resource->pool); |
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411 | else |
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412 | /* ### VIOLATING deltaV: you can't proppatch a baseline, it's |
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413 | not a working resource! But this is how we currently |
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414 | (hackily) allow the svn client to change unversioned rev |
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415 | props. See issue #916. */ |
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416 | serr = svn_repos_fs_change_rev_prop3(db->resource->info->repos->repos, |
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417 | db->resource->info->root.rev, |
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418 | db->resource->info->repos->username, |
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419 | propname, NULL, TRUE, TRUE, |
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420 | db->authz_read_func, |
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421 | db->authz_read_baton, |
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422 | db->resource->pool); |
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423 | else |
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424 | serr = svn_repos_fs_change_node_prop(db->resource->info->root.root, |
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425 | get_repos_path(db->resource->info), |
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426 | propname, NULL, db->resource->pool); |
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427 | if (serr != NULL) |
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428 | return dav_svn__convert_err(serr, HTTP_INTERNAL_SERVER_ERROR, |
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429 | "could not remove a property", |
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430 | db->resource->pool); |
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431 | |
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432 | /* a change to the props was made; make sure our cached copy is gone */ |
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433 | db->props = NULL; |
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434 | |
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435 | return NULL; |
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436 | } |
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437 | |
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438 | |
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439 | static int |
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440 | db_exists(dav_db *db, const dav_prop_name *name) |
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441 | { |
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442 | const char *propname; |
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443 | svn_string_t *propval; |
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444 | svn_error_t *serr; |
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445 | int retval; |
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446 | |
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447 | /* get the repos-local name */ |
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448 | get_repos_propname(db, name, &propname); |
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449 | |
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450 | /* ### non-svn props aren't in our repos */ |
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451 | if (propname == NULL) |
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452 | return 0; |
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453 | |
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454 | /* Working Baseline, Baseline, or (Working) Version resource */ |
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455 | if (db->resource->baselined) |
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456 | if (db->resource->type == DAV_RESOURCE_TYPE_WORKING) |
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457 | serr = svn_fs_txn_prop(&propval, db->resource->info->root.txn, |
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458 | propname, db->p); |
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459 | else |
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460 | serr = svn_repos_fs_revision_prop(&propval, |
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461 | db->resource->info->repos->repos, |
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462 | db->resource->info->root.rev, |
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463 | propname, |
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464 | db->authz_read_func, |
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465 | db->authz_read_baton, db->p); |
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466 | else |
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467 | serr = svn_fs_node_prop(&propval, db->resource->info->root.root, |
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468 | get_repos_path(db->resource->info), |
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469 | propname, db->p); |
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470 | |
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471 | /* ### try and dispose of the value? */ |
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472 | |
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473 | retval = (serr == NULL && propval != NULL); |
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474 | svn_error_clear(serr); |
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475 | return retval; |
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476 | } |
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477 | |
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478 | static void get_name(dav_db *db, dav_prop_name *pname) |
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479 | { |
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480 | if (db->hi == NULL) |
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481 | { |
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482 | pname->ns = pname->name = NULL; |
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483 | } |
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484 | else |
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485 | { |
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486 | const void *name; |
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487 | |
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488 | apr_hash_this(db->hi, &name, NULL, NULL); |
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489 | |
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490 | #define PREFIX_LEN (sizeof(SVN_PROP_PREFIX) - 1) |
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491 | if (strncmp(name, SVN_PROP_PREFIX, PREFIX_LEN) == 0) |
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492 | #undef PREFIX_LEN |
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493 | { |
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494 | pname->ns = SVN_DAV_PROP_NS_SVN; |
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495 | pname->name = (const char *)name + 4; |
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496 | } |
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497 | else |
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498 | { |
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499 | pname->ns = SVN_DAV_PROP_NS_CUSTOM; |
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500 | pname->name = name; |
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501 | } |
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502 | } |
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503 | } |
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504 | |
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505 | |
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506 | static dav_error * |
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507 | db_first_name(dav_db *db, dav_prop_name *pname) |
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508 | { |
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509 | /* for operational logging */ |
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510 | const char *action = NULL; |
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511 | |
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512 | /* if we don't have a copy of the properties, then get one */ |
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513 | if (db->props == NULL) |
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514 | { |
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515 | svn_error_t *serr; |
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516 | |
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517 | /* Working Baseline, Baseline, or (Working) Version resource */ |
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518 | if (db->resource->baselined) |
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519 | { |
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520 | if (db->resource->type == DAV_RESOURCE_TYPE_WORKING) |
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521 | serr = svn_fs_txn_proplist(&db->props, |
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522 | db->resource->info->root.txn, |
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523 | db->p); |
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524 | else |
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525 | { |
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526 | action = svn_log__rev_proplist(db->resource->info->root.rev, |
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527 | db->resource->pool); |
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528 | serr = svn_repos_fs_revision_proplist |
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529 | (&db->props, |
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530 | db->resource->info->repos->repos, |
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531 | db->resource->info->root.rev, |
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532 | db->authz_read_func, |
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533 | db->authz_read_baton, |
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534 | db->p); |
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535 | } |
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536 | } |
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537 | else |
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538 | { |
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539 | svn_node_kind_t kind; |
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540 | serr = svn_fs_node_proplist(&db->props, |
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541 | db->resource->info->root.root, |
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542 | get_repos_path(db->resource->info), |
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543 | db->p); |
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544 | if (! serr) |
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545 | serr = svn_fs_check_path(&kind, db->resource->info->root.root, |
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546 | get_repos_path(db->resource->info), |
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547 | db->p); |
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548 | |
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549 | if (! serr) |
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550 | { |
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551 | if (kind == svn_node_dir) |
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552 | action = svn_log__get_dir(db->resource->info->repos_path, |
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553 | db->resource->info->root.rev, |
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554 | FALSE, TRUE, 0, db->resource->pool); |
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555 | else |
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556 | action = svn_log__get_file(db->resource->info->repos_path, |
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557 | db->resource->info->root.rev, |
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558 | FALSE, TRUE, db->resource->pool); |
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559 | } |
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560 | } |
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561 | if (serr != NULL) |
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562 | return dav_svn__convert_err(serr, HTTP_INTERNAL_SERVER_ERROR, |
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563 | "could not begin sequencing through " |
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564 | "properties", |
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565 | db->resource->pool); |
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566 | } |
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567 | |
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568 | /* begin the iteration over the hash */ |
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569 | db->hi = apr_hash_first(db->p, db->props); |
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570 | |
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571 | /* fetch the first key */ |
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572 | get_name(db, pname); |
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573 | |
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574 | /* If we have a high-level action to log, do so. */ |
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575 | if (action != NULL) |
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576 | dav_svn__operational_log(db->resource->info, action); |
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577 | |
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578 | return NULL; |
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579 | } |
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580 | |
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581 | |
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582 | static dav_error * |
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583 | db_next_name(dav_db *db, dav_prop_name *pname) |
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584 | { |
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585 | /* skip to the next hash entry */ |
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586 | if (db->hi != NULL) |
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587 | db->hi = apr_hash_next(db->hi); |
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588 | |
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589 | /* fetch the key */ |
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590 | get_name(db, pname); |
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591 | |
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592 | return NULL; |
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593 | } |
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594 | |
---|
595 | |
---|
596 | static dav_error * |
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597 | db_get_rollback(dav_db *db, |
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598 | const dav_prop_name *name, |
---|
599 | dav_deadprop_rollback **prollback) |
---|
600 | { |
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601 | dav_error *err; |
---|
602 | dav_deadprop_rollback *ddp; |
---|
603 | svn_string_t *propval; |
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604 | |
---|
605 | if ((err = get_value(db, name, &propval)) != NULL) |
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606 | return err; |
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607 | |
---|
608 | ddp = apr_palloc(db->p, sizeof(*ddp)); |
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609 | ddp->name = *name; |
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610 | ddp->value.data = propval ? propval->data : NULL; |
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611 | ddp->value.len = propval ? propval->len : 0; |
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612 | |
---|
613 | *prollback = ddp; |
---|
614 | return NULL; |
---|
615 | } |
---|
616 | |
---|
617 | |
---|
618 | static dav_error * |
---|
619 | db_apply_rollback(dav_db *db, dav_deadprop_rollback *rollback) |
---|
620 | { |
---|
621 | if (rollback->value.data == NULL) |
---|
622 | { |
---|
623 | return db_remove(db, &rollback->name); |
---|
624 | } |
---|
625 | |
---|
626 | return save_value(db, &rollback->name, &rollback->value); |
---|
627 | } |
---|
628 | |
---|
629 | |
---|
630 | const dav_hooks_propdb dav_svn__hooks_propdb = { |
---|
631 | db_open, |
---|
632 | db_close, |
---|
633 | db_define_namespaces, |
---|
634 | db_output_value, |
---|
635 | db_map_namespaces, |
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636 | db_store, |
---|
637 | db_remove, |
---|
638 | db_exists, |
---|
639 | db_first_name, |
---|
640 | db_next_name, |
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641 | db_get_rollback, |
---|
642 | db_apply_rollback, |
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643 | }; |
---|