tools/crm_diff.c

/* */
This source file includes following definitions.
new_string_cb
original_string_cb
patch_cb
print_patch
apply_patch
log_patch_cib_versions
generate_patch
build_arg_context
main
   1 /*
   2  * Copyright 2005-2024 the Pacemaker project contributors
   3  *
   4  * The version control history for this file may have further details.
   5  *
   6  * This source code is licensed under the GNU General Public License version 2
   7  * or later (GPLv2+) WITHOUT ANY WARRANTY.
   8  */
   9 
  10 #include <crm_internal.h>
  11 
  12 #include <stdio.h>
  13 #include <unistd.h>
  14 #include <stdlib.h>
  15 #include <errno.h>
  16 #include <fcntl.h>
  17 #include <sys/param.h>
  18 #include <sys/types.h>
  19 
  20 #include <crm/crm.h>
  21 #include <crm/common/cmdline_internal.h>
  22 #include <crm/common/output_internal.h>
  23 #include <crm/common/xml.h>
  24 #include <crm/common/ipc.h>
  25 #include <crm/cib.h>
  26 
  27 #define SUMMARY "Compare two Pacemaker configurations (in XML format) to produce a custom diff-like output, " \
  28                 "or apply such an output as a patch"
  29 
  30 struct {
  31     gboolean apply;
  32     gboolean as_cib;
  33     gboolean no_version;
  34     gboolean raw_1;
  35     gboolean raw_2;
  36     gboolean use_stdin;
  37     char *xml_file_1;
  38     char *xml_file_2;
  39 } options;
  40 
  41 gboolean new_string_cb(const gchar *option_name, const gchar *optarg, gpointer data, GError **error);
  42 gboolean original_string_cb(const gchar *option_name, const gchar *optarg, gpointer data, GError **error);
  43 gboolean patch_cb(const gchar *option_name, const gchar *optarg, gpointer data, GError **error);
  44 
  45 static GOptionEntry original_xml_entries[] = {
  46     { "original", 'o', 0, G_OPTION_ARG_STRING, &options.xml_file_1,
  47       "XML is contained in the named file",
  48       "FILE" },
  49     { "original-string", 'O', 0, G_OPTION_ARG_CALLBACK, original_string_cb,
  50       "XML is contained in the supplied string",
  51       "STRING" },
  52 
  53     { NULL }
  54 };
  55 
  56 static GOptionEntry operation_entries[] = {
  57     { "new", 'n', 0, G_OPTION_ARG_STRING, &options.xml_file_2,
  58       "Compare the original XML to the contents of the named file",
  59       "FILE" },
  60     { "new-string", 'N', 0, G_OPTION_ARG_CALLBACK, new_string_cb,
  61       "Compare the original XML with the contents of the supplied string",
  62       "STRING" },
  63     { "patch", 'p', 0, G_OPTION_ARG_CALLBACK, patch_cb,
  64       "Patch the original XML with the contents of the named file",
  65       "FILE" },
  66 
  67     { NULL }
  68 };
  69 
  70 static GOptionEntry addl_entries[] = {
  71     { "cib", 'c', 0, G_OPTION_ARG_NONE, &options.as_cib,
  72       "Compare/patch the inputs as a CIB (includes versions details)",
  73       NULL },
  74     { "stdin", 's', 0, G_OPTION_ARG_NONE, &options.use_stdin,
  75       "",
  76       NULL },
  77     { "no-version", 'u', 0, G_OPTION_ARG_NONE, &options.no_version,
  78       "Generate the difference without versions details",
  79       NULL },
  80 
  81     { NULL }
  82 };
  83 
  84 gboolean
  85 new_string_cb(const gchar *option_name, const gchar *optarg, gpointer data, GError **error) {
     /*  */
  86     options.raw_2 = TRUE;
  87     pcmk__str_update(&options.xml_file_2, optarg);
  88     return TRUE;
  89 }
  90 
  91 gboolean
  92 original_string_cb(const gchar *option_name, const gchar *optarg, gpointer data, GError **error) {
     /*  */
  93     options.raw_1 = TRUE;
  94     pcmk__str_update(&options.xml_file_1, optarg);
  95     return TRUE;
  96 }
  97 
  98 gboolean
  99 patch_cb(const gchar *option_name, const gchar *optarg, gpointer data, GError **error) {
     /*  */
 100     options.apply = TRUE;
 101     pcmk__str_update(&options.xml_file_2, optarg);
 102     return TRUE;
 103 }
 104 
 105 static void
 106 print_patch(xmlNode *patch)
     /*  */
 107 {
 108     GString *buffer = g_string_sized_new(1024);
 109 
 110     pcmk__xml_string(patch, pcmk__xml_fmt_pretty, buffer, 0);
 111 
 112     printf("%s", buffer->str);
 113     g_string_free(buffer, TRUE);
 114     fflush(stdout);
 115 }
 116 
 117 // \return Standard Pacemaker return code
 118 static int
 119 apply_patch(xmlNode *input, xmlNode *patch, gboolean as_cib)
     /*  */
 120 {
 121     xmlNode *output = pcmk__xml_copy(NULL, input);
 122     int rc = xml_apply_patchset(output, patch, as_cib);
 123 
 124     rc = pcmk_legacy2rc(rc);
 125     if (rc != pcmk_rc_ok) {
 126         fprintf(stderr, "Could not apply patch: %s\n", pcmk_rc_str(rc));
 127         pcmk__xml_free(output);
 128         return rc;
 129     }
 130 
 131     if (output != NULL) {
 132         char *buffer;
 133 
 134         print_patch(output);
 135 
 136         buffer = pcmk__digest_xml(output, true);
 137         crm_trace("Digest: %s", pcmk__s(buffer, "<null>\n"));
 138         free(buffer);
 139         pcmk__xml_free(output);
 140     }
 141     return pcmk_rc_ok;
 142 }
 143 
 144 static void
 145 log_patch_cib_versions(xmlNode *patch)
     /*  */
 146 {
 147     int add[] = { 0, 0, 0 };
 148     int del[] = { 0, 0, 0 };
 149 
 150     const char *fmt = NULL;
 151     const char *digest = NULL;
 152 
 153     xml_patch_versions(patch, add, del);
 154     fmt = crm_element_value(patch, PCMK_XA_FORMAT);
 155     digest = crm_element_value(patch, PCMK__XA_DIGEST);
 156 
 157     if (add[2] != del[2] || add[1] != del[1] || add[0] != del[0]) {
 158         crm_info("Patch: --- %d.%d.%d %s", del[0], del[1], del[2], fmt);
 159         crm_info("Patch: +++ %d.%d.%d %s", add[0], add[1], add[2], digest);
 160     }
 161 }
 162 
 163 // \return Standard Pacemaker return code
 164 static int
 165 generate_patch(xmlNode *object_1, xmlNode *object_2, const char *xml_file_2,
     /*  */
 166                gboolean as_cib, gboolean no_version)
 167 {
 168     const char *vfields[] = {
 169         PCMK_XA_ADMIN_EPOCH,
 170         PCMK_XA_EPOCH,
 171         PCMK_XA_NUM_UPDATES,
 172     };
 173 
 174     xmlNode *output = NULL;
 175 
 176     /* If we're ignoring the version, make the version information
 177      * identical, so it isn't detected as a change. */
 178     if (no_version) {
 179         int lpc;
 180 
 181         for (lpc = 0; lpc < PCMK__NELEM(vfields); lpc++) {
 182             crm_copy_xml_element(object_1, object_2, vfields[lpc]);
 183         }
 184     }
 185 
 186     xml_track_changes(object_2, NULL, object_2, FALSE);
 187     if(as_cib) {
 188         xml_calculate_significant_changes(object_1, object_2);
 189     } else {
 190         xml_calculate_changes(object_1, object_2);
 191     }
 192     crm_log_xml_debug(object_2, (xml_file_2? xml_file_2: "target"));
 193 
 194     output = xml_create_patchset(0, object_1, object_2, NULL, FALSE);
 195 
 196     pcmk__log_xml_changes(LOG_INFO, object_2);
 197     xml_accept_changes(object_2);
 198 
 199     if (output == NULL) {
 200         return pcmk_rc_ok;  // No changes
 201     }
 202 
 203     patchset_process_digest(output, object_1, object_2, as_cib);
 204 
 205     if (as_cib) {
 206         log_patch_cib_versions(output);
 207 
 208     } else if (no_version) {
 209         pcmk__xml_free(pcmk__xe_first_child(output, PCMK_XE_VERSION, NULL,
 210                                             NULL));
 211     }
 212 
 213     pcmk__log_xml_patchset(LOG_NOTICE, output);
 214     print_patch(output);
 215     pcmk__xml_free(output);
 216 
 217     /* pcmk_rc_error means there's a non-empty diff.
 218      * @COMPAT Choose a more descriptive return code, like one that maps to
 219      * CRM_EX_DIGEST?
 220      */
 221     return pcmk_rc_error;
 222 }
 223 
 224 static GOptionContext *
 225 build_arg_context(pcmk__common_args_t *args) {
     /*  */
 226     GOptionContext *context = NULL;
 227 
 228     const char *description = "Examples:\n\n"
 229                               "Obtain the two different configuration files by running cibadmin on the two cluster setups to compare:\n\n"
 230                               "\t# cibadmin --query > cib-old.xml\n\n"
 231                               "\t# cibadmin --query > cib-new.xml\n\n"
 232                               "Calculate and save the difference between the two files:\n\n"
 233                               "\t# crm_diff --original cib-old.xml --new cib-new.xml > patch.xml\n\n"
 234                               "Apply the patch to the original file:\n\n"
 235                               "\t# crm_diff --original cib-old.xml --patch patch.xml > updated.xml\n\n"
 236                               "Apply the patch to the running cluster:\n\n"
 237                               "\t# cibadmin --patch -x patch.xml\n";
 238 
 239     context = pcmk__build_arg_context(args, NULL, NULL, NULL);
 240     g_option_context_set_description(context, description);
 241 
 242     pcmk__add_arg_group(context, "xml", "Original XML:",
 243                         "Show original XML options", original_xml_entries);
 244     pcmk__add_arg_group(context, "operation", "Operation:",
 245                         "Show operation options", operation_entries);
 246     pcmk__add_arg_group(context, "additional", "Additional Options:",
 247                         "Show additional options", addl_entries);
 248     return context;
 249 }
 250 
 251 int
 252 main(int argc, char **argv)
     /*  */
 253 {
 254     xmlNode *object_1 = NULL;
 255     xmlNode *object_2 = NULL;
 256 
 257     crm_exit_t exit_code = CRM_EX_OK;
 258     GError *error = NULL;
 259 
 260     pcmk__common_args_t *args = pcmk__new_common_args(SUMMARY);
 261     gchar **processed_args = pcmk__cmdline_preproc(argv, "nopNO");
 262     GOptionContext *context = build_arg_context(args);
 263 
 264     int rc = pcmk_rc_ok;
 265 
 266     if (!g_option_context_parse_strv(context, &processed_args, &error)) {
 267         exit_code = CRM_EX_USAGE;
 268         goto done;
 269     }
 270 
 271     pcmk__cli_init_logging("crm_diff", args->verbosity);
 272 
 273     if (args->version) {
 274         g_strfreev(processed_args);
 275         pcmk__free_arg_context(context);
 276         /* FIXME:  When crm_diff is converted to use formatted output, this can go. */
 277         pcmk__cli_help('v');
 278     }
 279 
 280     if (options.apply && options.no_version) {
 281         fprintf(stderr, "warning: -u/--no-version ignored with -p/--patch\n");
 282     } else if (options.as_cib && options.no_version) {
 283         fprintf(stderr, "error: -u/--no-version incompatible with -c/--cib\n");
 284         exit_code = CRM_EX_USAGE;
 285         goto done;
 286     }
 287 
 288     if (options.raw_1) {
 289         object_1 = pcmk__xml_parse(options.xml_file_1);
 290 
 291     } else if (options.use_stdin) {
 292         fprintf(stderr, "Input first XML fragment:");
 293         object_1 = pcmk__xml_read(NULL);
 294 
 295     } else if (options.xml_file_1 != NULL) {
 296         object_1 = pcmk__xml_read(options.xml_file_1);
 297     }
 298 
 299     if (options.raw_2) {
 300         object_2 = pcmk__xml_parse(options.xml_file_2);
 301 
 302     } else if (options.use_stdin) {
 303         fprintf(stderr, "Input second XML fragment:");
 304         object_2 = pcmk__xml_read(NULL);
 305 
 306     } else if (options.xml_file_2 != NULL) {
 307         object_2 = pcmk__xml_read(options.xml_file_2);
 308     }
 309 
 310     if (object_1 == NULL) {
 311         fprintf(stderr, "Could not parse the first XML fragment\n");
 312         exit_code = CRM_EX_DATAERR;
 313         goto done;
 314     }
 315     if (object_2 == NULL) {
 316         fprintf(stderr, "Could not parse the second XML fragment\n");
 317         exit_code = CRM_EX_DATAERR;
 318         goto done;
 319     }
 320 
 321     if (options.apply) {
 322         rc = apply_patch(object_1, object_2, options.as_cib);
 323     } else {
 324         rc = generate_patch(object_1, object_2, options.xml_file_2, options.as_cib, options.no_version);
 325     }
 326     exit_code = pcmk_rc2exitc(rc);
 327 
 328 done:
 329     g_strfreev(processed_args);
 330     pcmk__free_arg_context(context);
 331     free(options.xml_file_1);
 332     free(options.xml_file_2);
 333     pcmk__xml_free(object_1);
 334     pcmk__xml_free(object_2);
 335 
 336     pcmk__output_and_clear_error(&error, NULL);
 337     crm_exit(exit_code);
 338 }
/* */
root/tools/crm_diff.c

DEFINITIONS
