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yum.c
author Kristian H?gsberg <krh@redhat.com>
Mon Apr 07 11:56:48 2008 -0400 (2008-04-07)
changeset 202 e8594c82dffc
parent 143 59a9513fac54
child 212 e8f493d8ff9a
permissions -rw-r--r--
Remove redundant curl initialization. 
     1 #define _GNU_SOURCE

     2 

     3 #include <string.h>

     4 #include <stdio.h>

     5 #include <sys/stat.h>

     6 #include <sys/mman.h>

     7 #include <unistd.h>

     8 #include <fcntl.h>

     9 #include <errno.h>

    10 

    11 #include <expat.h>

    12 #include <zlib.h>

    13 #include "razor.h"

    14 

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

    16 

    17 enum {

    18 	YUM_STATE_BEGIN,

    19 	YUM_STATE_PACKAGE_NAME,

    20 	YUM_STATE_PACKAGE_ARCH,

    21 	YUM_STATE_CHECKSUM,

    22 	YUM_STATE_REQUIRES,

    23 	YUM_STATE_PROVIDES,

    24 	YUM_STATE_OBSOLETES,

    25 	YUM_STATE_CONFLICTS,

    26 	YUM_STATE_FILE

    27 };

    28 

    29 struct yum_context {

    30 	XML_Parser primary_parser;

    31 	XML_Parser filelists_parser;

    32 	XML_Parser current_parser;

    33 

    34 	struct razor_importer *importer;

    35 	struct import_property_context *current_property_context;

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

    37 	char pkgid[128];

    38 	int state;

    39 };

    40 

    41 static enum razor_version_relation

    42 yum_to_razor_flags (const char *flags)

    43 {

    44 	/* FIXME? */

    45 	if (!flags)

    46 		return RAZOR_VERSION_EQUAL;

    47 

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

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

    50 			return RAZOR_VERSION_LESS;

    51 		else

    52 			return RAZOR_VERSION_LESS_OR_EQUAL;

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

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

    55 			return RAZOR_VERSION_GREATER;

    56 		else

    57 			return RAZOR_VERSION_GREATER_OR_EQUAL;

    58 	} else

    59 		return RAZOR_VERSION_EQUAL;

    60 }

    61 

    62 static void

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

    64 {

    65 	struct yum_context *ctx = data;

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

    67 	char buffer[128];

    68 	int i;

    69 

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

    71 		ctx->state = YUM_STATE_PACKAGE_NAME;

    72 		ctx->p = ctx->name;

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

    74 		ctx->state = YUM_STATE_PACKAGE_ARCH;

    75 		ctx->p = ctx->arch;

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

    77 		epoch = NULL;

    78 		version = NULL;

    79 		release = NULL;

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

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

    82 				epoch = atts[i + 1];

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

    84 				version = atts[i + 1];

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

    86 				release = atts[i + 1];

    87 		}

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

    89 			fprintf(stderr, "invalid version tag, "

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

    91 			return;

    92 		}

    93 

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

    95 		razor_importer_begin_package(ctx->importer,

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

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

    98 		ctx->p = ctx->pkgid;

    99 		ctx->state = YUM_STATE_CHECKSUM;

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

   101 		ctx->state = YUM_STATE_REQUIRES;

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

   103 		ctx->state = YUM_STATE_PROVIDES;

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

   105 		ctx->state = YUM_STATE_OBSOLETES;

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

   107 		ctx->state = YUM_STATE_CONFLICTS;

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

   109 		   ctx->state != YUM_STATE_BEGIN) {

   110 		n = NULL;

   111 		epoch = NULL;

   112 		version = NULL;

   113 		release = NULL;

   114 		flags = NULL;

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

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

   117 				n = atts[i + 1];

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

   119 				epoch = atts[i + 1];

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

   121 				version = atts[i + 1];

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

   123 				release = atts[i + 1];

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

   125 				flags = atts[i + 1];

   126 		}

   127 

   128 		if (n == NULL) {

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

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

   131 			return;

   132 		}

   133 

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

   135 		switch (ctx->state) {

   136 		case YUM_STATE_REQUIRES:

   137 			razor_importer_add_property(ctx->importer, n,

   138 						    yum_to_razor_flags (flags),

   139 						    buffer,

   140 						    RAZOR_PROPERTY_REQUIRES);

   141 			break;

   142 		case YUM_STATE_PROVIDES:

   143 			razor_importer_add_property(ctx->importer, n,

   144 						    yum_to_razor_flags (flags),

   145 						    buffer,

   146 						    RAZOR_PROPERTY_PROVIDES);

   147 			break;

   148 		case YUM_STATE_OBSOLETES:

   149 			razor_importer_add_property(ctx->importer, n,

   150 						    yum_to_razor_flags (flags),

   151 						    buffer,

   152 						    RAZOR_PROPERTY_OBSOLETES);

   153 			break;

   154 		case YUM_STATE_CONFLICTS:

   155 			razor_importer_add_property(ctx->importer, n,

   156 						    yum_to_razor_flags (flags),

   157 						    buffer,

   158 						    RAZOR_PROPERTY_CONFLICTS);

   159 			break;

   160 		}

   161 	}

   162 }

   163 

   164 static void

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

   166 {

   167 	struct yum_context *ctx = data;

   168 

   169 	switch (ctx->state) {

   170 	case YUM_STATE_PACKAGE_NAME:

   171 	case YUM_STATE_PACKAGE_ARCH:

   172 	case YUM_STATE_CHECKSUM:

   173 	case YUM_STATE_FILE:

   174 		ctx->state = YUM_STATE_BEGIN;

   175 		break;

   176 	}

   177 

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

   179 		XML_StopParser(ctx->current_parser, XML_TRUE);

   180 		ctx->current_parser = ctx->filelists_parser;

   181 	}

   182 }

   183 

   184 static void

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

   186 {

   187 	struct yum_context *ctx = data;

   188 

   189 	switch (ctx->state) {

   190 	case YUM_STATE_PACKAGE_NAME:

   191 	case YUM_STATE_PACKAGE_ARCH:

   192 	case YUM_STATE_CHECKSUM:

   193 	case YUM_STATE_FILE:

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

   195 		ctx->p += len;

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

   197 		break;

   198 	}

   199 }

   200 

   201 static void

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

   203 {

   204 	struct yum_context *ctx = data;

   205 	const char *pkg, *pkgid;

   206 	int i;

   207 

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

   209 		pkg = NULL;

   210 		pkgid = NULL;

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

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

   213 				pkg = atts[i + 1];

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

   215 				pkgid = atts[i + 1];

   216 		}

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

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

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

   220 				pkg, pkgid, ctx->pkgid);

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

   222 		ctx->state = YUM_STATE_FILE;

   223 		ctx->p = ctx->buffer;

   224 	}

   225 }

   226 

   227 

   228 static void

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

   230 {

   231 	struct yum_context *ctx = data;

   232 

   233 	ctx->state = YUM_STATE_BEGIN;

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

   235 		XML_StopParser(ctx->current_parser, XML_TRUE);

   236 		ctx->current_parser = ctx->primary_parser;

   237 		razor_importer_finish_package(ctx->importer);

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

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

   240 

   241 }

   242 

   243 #define XML_BUFFER_SIZE 4096

   244 

   245 struct razor_set *

   246 razor_set_create_from_yum(void)

   247 {

   248 	struct yum_context ctx;

   249 	void *buf;

   250 	int len, ret;

   251 	gzFile primary, filelists;

   252 	XML_ParsingStatus status;

   253 

   254 	ctx.importer = razor_importer_new();	

   255 	ctx.state = YUM_STATE_BEGIN;

   256 

   257 	ctx.primary_parser = XML_ParserCreate(NULL);

   258 	XML_SetUserData(ctx.primary_parser, &ctx);

   259 	XML_SetElementHandler(ctx.primary_parser,

   260 			      yum_primary_start_element,

   261 			      yum_primary_end_element);

   262 	XML_SetCharacterDataHandler(ctx.primary_parser,

   263 				    yum_character_data);

   264 

   265 	ctx.filelists_parser = XML_ParserCreate(NULL);

   266 	XML_SetUserData(ctx.filelists_parser, &ctx);

   267 	XML_SetElementHandler(ctx.filelists_parser,

   268 			      yum_filelists_start_element,

   269 			      yum_filelists_end_element);

   270 	XML_SetCharacterDataHandler(ctx.filelists_parser,

   271 				    yum_character_data);

   272 

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

   274 	if (primary == NULL)

   275 		return NULL;

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

   277 	if (filelists == NULL)

   278 		return NULL;

   279 

   280 	ctx.current_parser = ctx.primary_parser;

   281 

   282 	do {

   283 		XML_GetParsingStatus(ctx.current_parser, &status);

   284 		switch (status.parsing) {

   285 		case XML_SUSPENDED:

   286 			ret = XML_ResumeParser(ctx.current_parser);

   287 			break;

   288 		case XML_PARSING:

   289 		case XML_INITIALIZED:

   290 			buf = XML_GetBuffer(ctx.current_parser,

   291 					    XML_BUFFER_SIZE);

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

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

   294 			else

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

   296 			if (len < 0) {

   297 				fprintf(stderr,

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

   299 					strerror(errno));

   300 				return NULL;

   301 			}

   302 

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

   304 			break;

   305 		case XML_FINISHED:

   306 			break;

   307 		}

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

   309 

   310 

   311 	XML_ParserFree(ctx.primary_parser);

   312 	XML_ParserFree(ctx.filelists_parser);

   313 

   314 	gzclose(primary);

   315 	gzclose(filelists);

   316 

   317 	return razor_importer_finish(ctx.importer);

   318 }
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