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yum.c
author Kristian H?gsberg <krh@localhost.localdomain>
Wed Apr 30 18:22:47 2008 -0400 (2008-04-30)
changeset 214 d1e9e6a80151
parent 192 55b177b689c0
child 224 5803b6151d02
permissions -rw-r--r--
Add more TODO items. 
     1 /*

     2  * Copyright (C) 2008  Kristian Høgsberg <krh@redhat.com>

     3  * Copyright (C) 2008  Red Hat, Inc

     4  *

     5  * This program is free software; you can redistribute it and/or modify

     6  * it under the terms of the GNU General Public License as published by

     7  * the Free Software Foundation; either version 2 of the License, or

     8  * (at your option) any later version.

     9  *

    10  * This program is distributed in the hope that it will be useful,

    11  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    13  * GNU General Public License for more details.

    14  *

    15  * You should have received a copy of the GNU General Public License along

    16  * with this program; if not, write to the Free Software Foundation, Inc.,

    17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

    18  */

    19 

    20 #define _GNU_SOURCE

    21 

    22 #include <string.h>

    23 #include <stdio.h>

    24 #include <sys/stat.h>

    25 #include <sys/mman.h>

    26 #include <unistd.h>

    27 #include <fcntl.h>

    28 #include <errno.h>

    29 

    30 #include <expat.h>

    31 #include <zlib.h>

    32 #include "razor.h"

    33 

    34 /* Import a yum filelist as a razor package set. */

    35 

    36 enum {

    37 	YUM_STATE_BEGIN,

    38 	YUM_STATE_PACKAGE_NAME,

    39 	YUM_STATE_PACKAGE_ARCH,

    40 	YUM_STATE_CHECKSUM,

    41 	YUM_STATE_REQUIRES,

    42 	YUM_STATE_PROVIDES,

    43 	YUM_STATE_OBSOLETES,

    44 	YUM_STATE_CONFLICTS,

    45 	YUM_STATE_FILE

    46 };

    47 

    48 struct yum_context {

    49 	XML_Parser primary_parser;

    50 	XML_Parser filelists_parser;

    51 	XML_Parser current_parser;

    52 

    53 	struct razor_importer *importer;

    54 	struct import_property_context *current_property_context;

    55 	char name[256], arch[64], buffer[512], *p;

    56 	char pkgid[128];

    57 	int state;

    58 };

    59 

    60 static enum razor_version_relation

    61 yum_to_razor_flags (const char *flags)

    62 {

    63 	/* FIXME? */

    64 	if (!flags)

    65 		return RAZOR_VERSION_EQUAL;

    66 

    67 	if (flags[0] == 'L') {

    68 		if (flags[1] == 'T')

    69 			return RAZOR_VERSION_LESS;

    70 		else

    71 			return RAZOR_VERSION_LESS_OR_EQUAL;

    72 	} else if (flags[0] == 'G') {

    73 		if (flags[1] == 'T')

    74 			return RAZOR_VERSION_GREATER;

    75 		else

    76 			return RAZOR_VERSION_GREATER_OR_EQUAL;

    77 	} else

    78 		return RAZOR_VERSION_EQUAL;

    79 }

    80 

    81 static void

    82 yum_primary_start_element(void *data, const char *name, const char **atts)

    83 {

    84 	struct yum_context *ctx = data;

    85 	const char *n, *epoch, *version, *release, *flags;

    86 	char buffer[128];

    87 	int i;

    88 

    89 	if (strcmp(name, "name") == 0) {

    90 		ctx->state = YUM_STATE_PACKAGE_NAME;

    91 		ctx->p = ctx->name;

    92 	} else if (strcmp(name, "arch") == 0) {

    93 		ctx->state = YUM_STATE_PACKAGE_ARCH;

    94 		ctx->p = ctx->arch;

    95 	} else if (strcmp(name, "version") == 0) {

    96 		epoch = NULL;

    97 		version = NULL;

    98 		release = NULL;

    99 		for (i = 0; atts[i]; i += 2) {

   100 			if (strcmp(atts[i], "epoch") == 0)

   101 				epoch = atts[i + 1];

   102 			else if (strcmp(atts[i], "ver") == 0)

   103 				version = atts[i + 1];

   104 			else if (strcmp(atts[i], "rel") == 0)

   105 				release = atts[i + 1];

   106 		}

   107 		if (version == NULL || release == NULL) {

   108 			fprintf(stderr, "invalid version tag, "

   109 				"missing version or  release attribute\n");

   110 			return;

   111 		}

   112 

   113 		razor_build_evr(buffer, sizeof buffer, epoch, version, release);

   114 		razor_importer_begin_package(ctx->importer,

   115 					     ctx->name, buffer, ctx->arch);

   116 	} else if (strcmp(name, "checksum") == 0) {

   117 		ctx->p = ctx->pkgid;

   118 		ctx->state = YUM_STATE_CHECKSUM;

   119 	} else if (strcmp(name, "rpm:requires") == 0) {

   120 		ctx->state = YUM_STATE_REQUIRES;

   121 	} else if (strcmp(name, "rpm:provides") == 0) {

   122 		ctx->state = YUM_STATE_PROVIDES;

   123 	} else if (strcmp(name, "rpm:obsoletes") == 0) {

   124 		ctx->state = YUM_STATE_OBSOLETES;

   125 	} else if (strcmp(name, "rpm:conflicts") == 0) {

   126 		ctx->state = YUM_STATE_CONFLICTS;

   127 	} else if (strcmp(name, "rpm:entry") == 0 &&

   128 		   ctx->state != YUM_STATE_BEGIN) {

   129 		n = NULL;

   130 		epoch = NULL;

   131 		version = NULL;

   132 		release = NULL;

   133 		flags = NULL;

   134 		for (i = 0; atts[i]; i += 2) {

   135 			if (strcmp(atts[i], "name") == 0)

   136 				n = atts[i + 1];

   137 			else if (strcmp(atts[i], "epoch") == 0)

   138 				epoch = atts[i + 1];

   139 			else if (strcmp(atts[i], "ver") == 0)

   140 				version = atts[i + 1];

   141 			else if (strcmp(atts[i], "rel") == 0)

   142 				release = atts[i + 1];

   143 			else if (strcmp(atts[i], "flags") == 0)

   144 				flags = atts[i + 1];

   145 		}

   146 

   147 		if (n == NULL) {

   148 			fprintf(stderr, "invalid rpm:entry, "

   149 				"missing name or version attributes\n");

   150 			return;

   151 		}

   152 

   153 		razor_build_evr(buffer, sizeof buffer, epoch, version, release);

   154 		switch (ctx->state) {

   155 		case YUM_STATE_REQUIRES:

   156 			razor_importer_add_property(ctx->importer, n,

   157 						    yum_to_razor_flags (flags),

   158 						    buffer,

   159 						    RAZOR_PROPERTY_REQUIRES);

   160 			break;

   161 		case YUM_STATE_PROVIDES:

   162 			razor_importer_add_property(ctx->importer, n,

   163 						    yum_to_razor_flags (flags),

   164 						    buffer,

   165 						    RAZOR_PROPERTY_PROVIDES);

   166 			break;

   167 		case YUM_STATE_OBSOLETES:

   168 			razor_importer_add_property(ctx->importer, n,

   169 						    yum_to_razor_flags (flags),

   170 						    buffer,

   171 						    RAZOR_PROPERTY_OBSOLETES);

   172 			break;

   173 		case YUM_STATE_CONFLICTS:

   174 			razor_importer_add_property(ctx->importer, n,

   175 						    yum_to_razor_flags (flags),

   176 						    buffer,

   177 						    RAZOR_PROPERTY_CONFLICTS);

   178 			break;

   179 		}

   180 	}

   181 }

   182 

   183 static void

   184 yum_primary_end_element (void *data, const char *name)

   185 {

   186 	struct yum_context *ctx = data;

   187 

   188 	switch (ctx->state) {

   189 	case YUM_STATE_PACKAGE_NAME:

   190 	case YUM_STATE_PACKAGE_ARCH:

   191 	case YUM_STATE_CHECKSUM:

   192 	case YUM_STATE_FILE:

   193 		ctx->state = YUM_STATE_BEGIN;

   194 		break;

   195 	}

   196 

   197 	if (strcmp(name, "package") == 0) {

   198 		XML_StopParser(ctx->current_parser, XML_TRUE);

   199 		ctx->current_parser = ctx->filelists_parser;

   200 	}

   201 }

   202 

   203 static void

   204 yum_character_data (void *data, const XML_Char *s, int len)

   205 {

   206 	struct yum_context *ctx = data;

   207 

   208 	switch (ctx->state) {

   209 	case YUM_STATE_PACKAGE_NAME:

   210 	case YUM_STATE_PACKAGE_ARCH:

   211 	case YUM_STATE_CHECKSUM:

   212 	case YUM_STATE_FILE:

   213 		memcpy(ctx->p, s, len);

   214 		ctx->p += len;

   215 		*ctx->p = '\0';

   216 		break;

   217 	}

   218 }

   219 

   220 static void

   221 yum_filelists_start_element(void *data, const char *name, const char **atts)

   222 {

   223 	struct yum_context *ctx = data;

   224 	const char *pkg, *pkgid;

   225 	int i;

   226 

   227 	if (strcmp(name, "package") == 0) {

   228 		pkg = NULL;

   229 		pkgid = NULL;

   230 		for (i = 0; atts[i]; i += 2) {

   231 			if (strcmp(atts[i], "name") == 0)

   232 				pkg = atts[i + 1];

   233 			else if (strcmp(atts[i], "pkgid") == 0)

   234 				pkgid = atts[i + 1];

   235 		}

   236 		if (strcmp(pkgid, ctx->pkgid) != 0)

   237 			fprintf(stderr, "primary.xml and filelists.xml "

   238 				"mismatch for %s: %s vs %s",

   239 				pkg, pkgid, ctx->pkgid);

   240 	} else if (strcmp(name, "file") == 0) {

   241 		ctx->state = YUM_STATE_FILE;

   242 		ctx->p = ctx->buffer;

   243 	}

   244 }

   245 

   246 

   247 static void

   248 yum_filelists_end_element (void *data, const char *name)

   249 {

   250 	struct yum_context *ctx = data;

   251 

   252 	ctx->state = YUM_STATE_BEGIN;

   253 	if (strcmp(name, "package") == 0) {

   254 		XML_StopParser(ctx->current_parser, XML_TRUE);

   255 		ctx->current_parser = ctx->primary_parser;

   256 		razor_importer_finish_package(ctx->importer);

   257 	} else if (strcmp(name, "file") == 0)

   258 		razor_importer_add_file(ctx->importer, ctx->buffer);

   259 

   260 }

   261 

   262 #define XML_BUFFER_SIZE 4096

   263 

   264 struct razor_set *

   265 razor_set_create_from_yum(void)

   266 {

   267 	struct yum_context ctx;

   268 	void *buf;

   269 	int len, ret;

   270 	gzFile primary, filelists;

   271 	XML_ParsingStatus status;

   272 

   273 	ctx.importer = razor_importer_new();	

   274 	ctx.state = YUM_STATE_BEGIN;

   275 

   276 	ctx.primary_parser = XML_ParserCreate(NULL);

   277 	XML_SetUserData(ctx.primary_parser, &ctx);

   278 	XML_SetElementHandler(ctx.primary_parser,

   279 			      yum_primary_start_element,

   280 			      yum_primary_end_element);

   281 	XML_SetCharacterDataHandler(ctx.primary_parser,

   282 				    yum_character_data);

   283 

   284 	ctx.filelists_parser = XML_ParserCreate(NULL);

   285 	XML_SetUserData(ctx.filelists_parser, &ctx);

   286 	XML_SetElementHandler(ctx.filelists_parser,

   287 			      yum_filelists_start_element,

   288 			      yum_filelists_end_element);

   289 	XML_SetCharacterDataHandler(ctx.filelists_parser,

   290 				    yum_character_data);

   291 

   292 	primary = gzopen("primary.xml.gz", "rb");

   293 	if (primary == NULL)

   294 		return NULL;

   295 	filelists = gzopen("filelists.xml.gz", "rb");

   296 	if (filelists == NULL)

   297 		return NULL;

   298 

   299 	ctx.current_parser = ctx.primary_parser;

   300 

   301 	do {

   302 		XML_GetParsingStatus(ctx.current_parser, &status);

   303 		switch (status.parsing) {

   304 		case XML_SUSPENDED:

   305 			ret = XML_ResumeParser(ctx.current_parser);

   306 			break;

   307 		case XML_PARSING:

   308 		case XML_INITIALIZED:

   309 			buf = XML_GetBuffer(ctx.current_parser,

   310 					    XML_BUFFER_SIZE);

   311 			if (ctx.current_parser == ctx.primary_parser)

   312 				len = gzread(primary, buf, XML_BUFFER_SIZE);

   313 			else

   314 				len = gzread(filelists, buf, XML_BUFFER_SIZE);

   315 			if (len < 0) {

   316 				fprintf(stderr,

   317 					"couldn't read input: %s\n",

   318 					strerror(errno));

   319 				return NULL;

   320 			}

   321 

   322 			XML_ParseBuffer(ctx.current_parser, len, len == 0);

   323 			break;

   324 		case XML_FINISHED:

   325 			break;

   326 		}

   327 	} while (status.parsing != XML_FINISHED);

   328 

   329 

   330 	XML_ParserFree(ctx.primary_parser);

   331 	XML_ParserFree(ctx.filelists_parser);

   332 

   333 	gzclose(primary);

   334 	gzclose(filelists);

   335 

   336 	return razor_importer_finish(ctx.importer);

   337 }
razor