/*

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

  * Copyright (C) 2008  Red Hat, Inc

  *

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

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

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

  * (at your option) any later version.

  *

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

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

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  *

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

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

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

  */

 #include "config.h"

 #include <stdio.h>

 #include <stddef.h>

 #include <stdlib.h>

 #include <string.h>

 #include <errno.h>

 #include <sys/stat.h>

 #include <sys/types.h>

 #if HAVE_SYS_WAIT_H

 #include <sys/wait.h>

 #endif

 #include <fcntl.h>

 #include <dirent.h>

 #include <unistd.h>

 #if MSWIN_API

 #include <winsock2.h>	/* For ntohl() */

 #else

 #include <arpa/inet.h>

 #endif

 #include <limits.h>

 #include <zlib.h>

 #include <assert.h>

 #include "razor.h"

 #include "razor-internal.h"

 #ifndef O_BINARY

 #define O_BINARY	0

 #endif

 #define	RPM_LEAD_SIZE 96

 enum {

     PIPE	=  1,	/*!< pipe/fifo */

     CDEV	=  2,	/*!< character device */

     XDIR	=  4,	/*!< directory */

     BDEV	=  6,	/*!< block device */

     REG		=  8,	/*!< regular file */

     LINK	= 10,	/*!< hard link */

     SOCK	= 12	/*!< socket */

 };

 enum {

     RPMSENSE_LESS		= 1 << 1,

     RPMSENSE_GREATER		= 1 << 2,

     RPMSENSE_EQUAL		= 1 << 3,

     RPMSENSE_PREREQ		= 1 << 6,

     RPMSENSE_SCRIPT_PRE		= 1 << 9,

     RPMSENSE_SCRIPT_POST	= 1 << 10,

     RPMSENSE_SCRIPT_PREUN	= 1 << 11,

     RPMSENSE_SCRIPT_POSTUN	= 1 << 12,

 };

 enum {

     RPMTAG_NAME  		= 1000,	/* s */

     RPMTAG_VERSION		= 1001,	/* s */

     RPMTAG_RELEASE		= 1002,	/* s */

     RPMTAG_EPOCH   		= 1003,	/* i */

     RPMTAG_SUMMARY		= 1004,	/* s{} */

     RPMTAG_DESCRIPTION		= 1005,	/* s{} */

     RPMTAG_BUILDTIME		= 1006,	/* i */

     RPMTAG_BUILDHOST		= 1007,	/* s */

     RPMTAG_INSTALLTIME		= 1008,	/* i */

     RPMTAG_SIZE			= 1009,	/* i */

     RPMTAG_DISTRIBUTION		= 1010,	/* s */

     RPMTAG_VENDOR		= 1011,	/* s */

     RPMTAG_GIF			= 1012,	/* x */

     RPMTAG_XPM			= 1013,	/* x */

     RPMTAG_LICENSE		= 1014,	/* s */

     RPMTAG_PACKAGER		= 1015,	/* s */

     RPMTAG_GROUP		= 1016,	/* s{} */

     RPMTAG_CHANGELOG		= 1017, /*!< s[] internal */

     RPMTAG_SOURCE		= 1018,	/* s[] */

     RPMTAG_PATCH		= 1019,	/* s[] */

     RPMTAG_URL			= 1020,	/* s */

     RPMTAG_OS			= 1021,	/* s legacy used int */

     RPMTAG_ARCH			= 1022,	/* s legacy used int */

     RPMTAG_PREIN		= 1023,	/* s */

     RPMTAG_POSTIN		= 1024,	/* s */

     RPMTAG_PREUN		= 1025,	/* s */

     RPMTAG_POSTUN		= 1026,	/* s */

     RPMTAG_OLDFILENAMES		= 1027, /* s[] obsolete */

     RPMTAG_FILESIZES		= 1028,	/* i */

     RPMTAG_FILESTATES		= 1029, /* c */

     RPMTAG_FILEMODES		= 1030,	/* h */

     RPMTAG_FILEUIDS		= 1031, /*!< internal */

     RPMTAG_FILEGIDS		= 1032, /*!< internal */

     RPMTAG_FILERDEVS		= 1033,	/* h */

     RPMTAG_FILEMTIMES		= 1034, /* i */

     RPMTAG_FILEMD5S		= 1035,	/* s[] */

     RPMTAG_FILELINKTOS		= 1036,	/* s[] */

     RPMTAG_FILEFLAGS		= 1037,	/* i */

     RPMTAG_ROOT			= 1038, /*!< internal - obsolete */

     RPMTAG_FILEUSERNAME		= 1039,	/* s[] */

     RPMTAG_FILEGROUPNAME	= 1040,	/* s[] */

     RPMTAG_EXCLUDE		= 1041, /*!< internal - obsolete */

     RPMTAG_EXCLUSIVE		= 1042, /*!< internal - obsolete */

     RPMTAG_ICON			= 1043,

     RPMTAG_SOURCERPM		= 1044,	/* s */

     RPMTAG_FILEVERIFYFLAGS	= 1045,	/* i */

     RPMTAG_ARCHIVESIZE		= 1046,	/* i */

     RPMTAG_PROVIDENAME		= 1047,	/* s[] */

     RPMTAG_REQUIREFLAGS		= 1048,	/* i */

     RPMTAG_REQUIRENAME		= 1049,	/* s[] */

     RPMTAG_REQUIREVERSION	= 1050,	/* s[] */

     RPMTAG_NOSOURCE		= 1051, /*!< internal */

     RPMTAG_NOPATCH		= 1052, /*!< internal */

     RPMTAG_CONFLICTFLAGS	= 1053, /* i */

     RPMTAG_CONFLICTNAME		= 1054,	/* s[] */

     RPMTAG_CONFLICTVERSION	= 1055,	/* s[] */

     RPMTAG_DEFAULTPREFIX	= 1056, /*!< internal - deprecated */

     RPMTAG_BUILDROOT		= 1057, /*!< internal */

     RPMTAG_INSTALLPREFIX	= 1058, /*!< internal - deprecated */

     RPMTAG_EXCLUDEARCH		= 1059,

     RPMTAG_EXCLUDEOS		= 1060,

     RPMTAG_EXCLUSIVEARCH	= 1061,

     RPMTAG_EXCLUSIVEOS		= 1062,

     RPMTAG_AUTOREQPROV		= 1063, /*!< internal */

     RPMTAG_RPMVERSION		= 1064,	/* s */

     RPMTAG_TRIGGERSCRIPTS	= 1065,	/* s[] */

     RPMTAG_TRIGGERNAME		= 1066,	/* s[] */

     RPMTAG_TRIGGERVERSION	= 1067,	/* s[] */

     RPMTAG_TRIGGERFLAGS		= 1068,	/* i */

     RPMTAG_TRIGGERINDEX		= 1069,	/* i */

     RPMTAG_VERIFYSCRIPT		= 1079,	/* s */

     RPMTAG_CHANGELOGTIME	= 1080,	/* i */

     RPMTAG_CHANGELOGNAME	= 1081,	/* s[] */

     RPMTAG_CHANGELOGTEXT	= 1082,	/* s[] */

     RPMTAG_BROKENMD5		= 1083, /*!< internal - obsolete */

     RPMTAG_PREREQ		= 1084, /*!< internal */

     RPMTAG_PREINPROG		= 1085,	/* s */

     RPMTAG_POSTINPROG		= 1086,	/* s */

     RPMTAG_PREUNPROG		= 1087,	/* s */

     RPMTAG_POSTUNPROG		= 1088,	/* s */

     RPMTAG_BUILDARCHS		= 1089,

     RPMTAG_OBSOLETENAME		= 1090,	/* s[] */

     RPMTAG_VERIFYSCRIPTPROG	= 1091,	/* s */

     RPMTAG_TRIGGERSCRIPTPROG	= 1092,	/* s */

     RPMTAG_DOCDIR		= 1093, /*!< internal */

     RPMTAG_COOKIE		= 1094,	/* s */

     RPMTAG_FILEDEVICES		= 1095,	/* i */

     RPMTAG_FILEINODES		= 1096,	/* i */

     RPMTAG_FILELANGS		= 1097,	/* s[] */

     RPMTAG_PREFIXES		= 1098,	/* s[] */

     RPMTAG_INSTPREFIXES		= 1099,	/* s[] */

     RPMTAG_TRIGGERIN		= 1100, /*!< internal */

     RPMTAG_TRIGGERUN		= 1101, /*!< internal */

     RPMTAG_TRIGGERPOSTUN	= 1102, /*!< internal */

     RPMTAG_AUTOREQ		= 1103, /*!< internal */

     RPMTAG_AUTOPROV		= 1104, /*!< internal */

     RPMTAG_CAPABILITY		= 1105, /*!< internal - obsolete */

     RPMTAG_SOURCEPACKAGE	= 1106, /*!< i src.rpm header marker */

     RPMTAG_OLDORIGFILENAMES	= 1107, /*!< internal - obsolete */

     RPMTAG_BUILDPREREQ		= 1108, /*!< internal */

     RPMTAG_BUILDREQUIRES	= 1109, /*!< internal */

     RPMTAG_BUILDCONFLICTS	= 1110, /*!< internal */

     RPMTAG_BUILDMACROS		= 1111, /*!< internal - unused */

     RPMTAG_PROVIDEFLAGS		= 1112,	/* i */

     RPMTAG_PROVIDEVERSION	= 1113,	/* s[] */

     RPMTAG_OBSOLETEFLAGS	= 1114,	/* i */

     RPMTAG_OBSOLETEVERSION	= 1115,	/* s[] */

     RPMTAG_DIRINDEXES		= 1116,	/* i */

     RPMTAG_BASENAMES		= 1117,	/* s[] */

     RPMTAG_DIRNAMES		= 1118,	/* s[] */

     RPMTAG_ORIGDIRINDEXES	= 1119, /*!< internal */

     RPMTAG_ORIGBASENAMES	= 1120, /*!< internal */

     RPMTAG_ORIGDIRNAMES		= 1121, /*!< internal */

     RPMTAG_OPTFLAGS		= 1122,	/* s */

     RPMTAG_DISTURL		= 1123,	/* s */

     RPMTAG_PAYLOADFORMAT	= 1124,	/* s */

     RPMTAG_PAYLOADCOMPRESSOR	= 1125,	/* s */

     RPMTAG_PAYLOADFLAGS		= 1126,	/* s */

     RPMTAG_INSTALLCOLOR		= 1127, /*!< i transaction color when installed */

     RPMTAG_INSTALLTID		= 1128,	/* i */

     RPMTAG_REMOVETID		= 1129,	/* i */

     RPMTAG_SHA1RHN		= 1130, /*!< internal - obsolete */

     RPMTAG_RHNPLATFORM		= 1131,	/* s */

     RPMTAG_PLATFORM		= 1132,	/* s */

     RPMTAG_PATCHESNAME		= 1133, /*!< placeholder (SuSE) */

     RPMTAG_PATCHESFLAGS		= 1134, /*!< placeholder (SuSE) */

     RPMTAG_PATCHESVERSION	= 1135, /*!< placeholder (SuSE) */

     RPMTAG_CACHECTIME		= 1136,	/* i */

     RPMTAG_CACHEPKGPATH		= 1137,	/* s */

     RPMTAG_CACHEPKGSIZE		= 1138,	/* i */

     RPMTAG_CACHEPKGMTIME	= 1139,	/* i */

     RPMTAG_FILECOLORS		= 1140,	/* i */

     RPMTAG_FILECLASS		= 1141,	/* i */

     RPMTAG_CLASSDICT		= 1142,	/* s[] */

     RPMTAG_FILEDEPENDSX		= 1143,	/* i */

     RPMTAG_FILEDEPENDSN		= 1144,	/* i */

     RPMTAG_DEPENDSDICT		= 1145,	/* i */

     RPMTAG_SOURCEPKGID		= 1146,	/* x */

     RPMTAG_FILECONTEXTS		= 1147,	/* s[] */

     RPMTAG_FSCONTEXTS		= 1148,	/*!< s[] extension */

     RPMTAG_RECONTEXTS		= 1149,	/*!< s[] extension */

     RPMTAG_POLICIES		= 1150,	/*!< s[] selinux *.te policy file. */

     RPMTAG_PRETRANS		= 1151,	/* s */

     RPMTAG_POSTTRANS		= 1152,	/* s */

     RPMTAG_PRETRANSPROG		= 1153,	/* s */

     RPMTAG_POSTTRANSPROG	= 1154,	/* s */

     RPMTAG_DISTTAG		= 1155,	/* s */

     RPMTAG_SUGGESTSNAME		= 1156,	/* s[] extension placeholder */

     RPMTAG_SUGGESTSVERSION	= 1157,	/* s[] extension placeholder */

     RPMTAG_SUGGESTSFLAGS	= 1158,	/* i   extension placeholder */

     RPMTAG_ENHANCESNAME		= 1159,	/* s[] extension placeholder */

     RPMTAG_ENHANCESVERSION	= 1160,	/* s[] extension placeholder */

     RPMTAG_ENHANCESFLAGS	= 1161,	/* i   extension placeholder */

     RPMTAG_PRIORITY		= 1162, /* i   extension placeholder */

     RPMTAG_CVSID		= 1163, /* s */

     RPMTAG_TRIGGERPREIN		= 1171, /*!< internal */

 };

 struct rpm_header {

 	unsigned char magic[4];

 	unsigned char reserved[4];

 	int nindex;

 	int hsize;

 };

 struct rpm_header_index {

 	int tag;

 	int type;

 	int offset;

 	int count;

 };

 struct razor_rpm {

 	struct rpm_header *signature;

 	struct rpm_header *header;

 	const char **dirs;

 	const char *pool;

 	void *map;

 	size_t size;

 	void *payload;

 };

 static struct rpm_header_index *

 razor_rpm_get_header(struct razor_rpm *rpm, unsigned int tag)

 {

 	struct rpm_header_index *index, *end;

 	index = (struct rpm_header_index *) (rpm->header + 1);

 	end = index + ntohl(rpm->header->nindex);

 	while (index < end) {

 		if (ntohl(index->tag) == tag)

 			return index;

 		index++;

 	}

 	return NULL;

 }

 static const void *

 razor_rpm_get_indirect(struct razor_rpm *rpm,

 		       unsigned int tag, unsigned int *count)

 {

 	struct rpm_header_index *index;

 	index = razor_rpm_get_header(rpm, tag);

 	if (index != NULL) {

 		if (count)

 			*count = ntohl(index->count);

 		return rpm->pool + ntohl(index->offset);

 	}

 	return NULL;

 }

 static uint32_t

 rpm_to_razor_flags(uint32_t flags)

 {

 	uint32_t razor_flags;

 	razor_flags = 0;

 	if (flags & RPMSENSE_LESS)

 		razor_flags |= RAZOR_PROPERTY_LESS;

 	if (flags & RPMSENSE_EQUAL)

 		razor_flags |= RAZOR_PROPERTY_EQUAL;

 	if (flags & RPMSENSE_GREATER)

 		razor_flags |= RAZOR_PROPERTY_GREATER;

 	if (flags & RPMSENSE_SCRIPT_PRE)

 		razor_flags |= RAZOR_PROPERTY_PRE;

 	if (flags & RPMSENSE_SCRIPT_POST)

 		razor_flags |= RAZOR_PROPERTY_POST;

 	if (flags & RPMSENSE_SCRIPT_PREUN)

 		razor_flags |= RAZOR_PROPERTY_PREUN;

 	if (flags & RPMSENSE_SCRIPT_POSTUN)

 		razor_flags |= RAZOR_PROPERTY_POSTUN;

 	return razor_flags;

 }

 static void

 import_properties(struct razor_importer *importer, uint32_t type,

 		  struct razor_rpm *rpm,

 		  int name_tag, int version_tag, int flags_tag)

 {

 	const char *name, *version;

 	const uint32_t *flags;

 	uint32_t f;

 	unsigned int i, count;

 	name = razor_rpm_get_indirect(rpm, name_tag, &count);

 	if (name == NULL)

 		return;

 	flags = razor_rpm_get_indirect(rpm, flags_tag, &count);

 	version = razor_rpm_get_indirect(rpm, version_tag, &count);

 	for (i = 0; i < count; i++) {

 		f = rpm_to_razor_flags(ntohl(flags[i]));

 		razor_importer_add_property(importer, name, f | type, version);

 		name += strlen(name) + 1;

 		version += strlen(version) + 1;

 	}

 }

 static void

 import_files(struct razor_importer *importer, struct razor_rpm *rpm)

 {

 	const char *name;

 	const uint32_t *index;

 	unsigned int i, count;

 	char buffer[256];

 	if (rpm->dirs == NULL)

 		return;

 	/* assert: count is the same for all arrays */

 	index = razor_rpm_get_indirect(rpm, RPMTAG_DIRINDEXES, &count);

 	name = razor_rpm_get_indirect(rpm, RPMTAG_BASENAMES, &count);

 	for (i = 0; i < count; i++) {

 		snprintf(buffer, sizeof buffer,

 			 "%s%s", rpm->dirs[ntohl(*index)], name);

 		razor_importer_add_file(importer, buffer);

 		name += strlen(name) + 1;

 		index++;

 	}

 }

 RAZOR_EXPORT struct razor_rpm *

 razor_rpm_open(const char *filename)

 {

 	struct razor_rpm *rpm;

 	struct rpm_header_index *base, *index;

 	unsigned int count, i, nindex, hsize;

 	const char *name;

 	assert (filename != NULL);

 	rpm = malloc(sizeof *rpm);

 	if (rpm == NULL)

 		return NULL;

 	memset(rpm, 0, sizeof *rpm);

 	rpm->map = razor_file_get_contents(filename, &rpm->size);

 	if (!rpm->map) {

 		fprintf(stderr, "couldn't get contents of %s (%s)\n", filename,

 			strerror(errno));

 		return NULL;

 	}

 	rpm->signature = rpm->map + RPM_LEAD_SIZE;

 	nindex = ntohl(rpm->signature->nindex);

 	hsize = ntohl(rpm->signature->hsize);

 	rpm->header = (void *) (rpm->signature + 1) +

 		ALIGN(nindex * sizeof *index + hsize, 8);

 	nindex = ntohl(rpm->header->nindex);

 	hsize = ntohl(rpm->header->hsize);

 	rpm->payload = (void *) (rpm->header + 1) +

 		nindex * sizeof *index + hsize;

 	base = (struct rpm_header_index *) (rpm->header + 1);

 	rpm->pool = (void *) base + nindex * sizeof *index;

 	/* Look up dir names now so we can index them directly. */

 	name = razor_rpm_get_indirect(rpm, RPMTAG_DIRNAMES, &count);

 	if (name) {

 		rpm->dirs = calloc(count, sizeof *rpm->dirs);

 		for (i = 0; i < count; i++) {

 			rpm->dirs[i] = name;

 			name += strlen(name) + 1;

 		}

 	} else {

 		name = razor_rpm_get_indirect(rpm, RPMTAG_OLDFILENAMES,

 					      &count);

 		if (name) {

 			fprintf(stderr, "old filenames not supported\n");

 			return NULL;

 		}

 	}

 	return rpm;

 }

 struct cpio_file_header {

 	char magic[6];

 	char inode[8];

 	char mode[8];

 	char uid[8];

 	char gid[8];

 	char nlink[8];

 	char mtime[8];

 	char filesize[8];

 	char devmajor[8];

 	char devminor[8];

 	char rdevmajor[8];

 	char rdevminor[8];

 	char namesize[8];

 	char checksum[8];

 	char filename[0];

 };

 /* gzip flags */

 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */

 #define HEAD_CRC     0x02 /* bit 1 set: header CRC present */

 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */

 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */

 #define COMMENT      0x10 /* bit 4 set: file comment present */

 #define RESERVED     0xE0 /* bits 5..7: reserved */

 struct installer {

 	const char *root;

 	struct razor_rpm *rpm;

 	z_stream stream;

 	unsigned char buffer[32768];

 	size_t rest, length;

 };

 static int

 installer_inflate(struct installer *installer)

 {

 	size_t length;

 	int err;

 	if (installer->rest > sizeof installer->buffer)

 		length = sizeof installer->buffer;

 	else

 		length = installer->rest;

 	installer->stream.next_out = installer->buffer;

 	installer->stream.avail_out = length;

 	err = inflate(&installer->stream, Z_SYNC_FLUSH);

 	if (err != Z_OK && err != Z_STREAM_END) {

 		fprintf(stderr, "inflate error: %d (%s)\n", err,

 			strerror(errno));

 		return -1;

 	}

 	installer->rest -= length;

 	installer->length = length;

 	return 0;

 }

 static int

 installer_align(struct installer *installer, size_t size)

 {

 	unsigned char buffer[4];

 	int err;

 	installer->stream.next_out = buffer;

 	installer->stream.avail_out =

 		(size - installer->stream.total_out) & (size - 1);

 	if (installer->stream.avail_out == 0)

 		return 0;

 	err = inflate(&installer->stream, Z_SYNC_FLUSH);

 	if (err != Z_OK && err != Z_STREAM_END) {

 		fprintf(stderr, "inflate error: %d (%s)\n", err,

 			strerror(errno));

 		return -1;

 	}

 	return 0;

 }

 static int

 create_path(struct installer *installer, const char *path, unsigned int mode)

 {

 	char buffer[PATH_MAX];

 	struct stat buf;

 	int fd, ret;

 	if (razor_create_dir(installer->root, path) < 0)

 		return -1;

 	snprintf(buffer, sizeof buffer, "%s%s", installer->root, path);

 	switch (mode >> 12) {

 	case REG:

 		/* FIXME: handle the case where a file is already there. */

 		fd = open(buffer, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,

 			  mode & 0x1ff);

 		if (fd < 0){

 			fprintf(stderr, "failed to create file %s\n", buffer);

 			return -1;

 		}

 		while (installer->rest > 0) {

 			if (installer_inflate(installer)) {

 				fprintf(stderr, "failed to inflate\n");

 				return -1;

 			}

 			if (razor_write(fd, installer->buffer,

 					installer->length)) {

 				fprintf(stderr, "failed to write payload\n");

 				return -1;

 			}

 		}

 		if (close(fd) < 0) {

 			fprintf(stderr, "failed to close %s: %s\n", buffer,

 				strerror(errno));

 			return -1;

 		}

 		return 0;

 	case XDIR:

 		ret = mkdir(buffer, mode & 0x1ff);

 		if (ret == 0 || errno != EEXIST)

 			return ret;

 		if (stat(buffer, &buf) || !S_ISDIR(buf.st_mode)) {

 			/* FIXME: also check that mode match. */

 			fprintf(stderr,

 				"%s exists but is not a directory\n", buffer);

 			return -1;

 		}

 		return 0;

 	case LINK:

 #if HAVE_SYMLINK

 		if (installer_inflate(installer)) {

 			fprintf(stderr, "failed to inflate\n");

 			return -1;

 		}

 		if (installer->length >= sizeof installer->buffer) {

 			fprintf(stderr, "link name too long\n");

 			return -1;

 		}

 		installer->buffer[installer->length] = '\0';

 		if (symlink((const char *) installer->buffer, buffer)) {

 			perror("failed to create symlink");

 			return -1;

 		}

 		return 0;

 #else

 		/* fall through */

 #endif

 	case PIPE:

 	case CDEV:

 	case BDEV:

 	case SOCK:

 		printf("%s: unhandled file type %d\n", buffer, mode >> 12);

 		return 0;

 	default:

 		printf("%s: unknown file type %d\n", buffer, mode >> 12);

 		return 0;

 	}

 }

 static int

 run_script(struct installer *installer,

 	   unsigned int program_tag, unsigned int script_tag)

 {

 #if HAVE_CHROOT

 	int pid, status, fd[2];

 #else

 	FILE *fp;

 #endif

 	const char *script = NULL, *program = NULL;

 	program = razor_rpm_get_indirect(installer->rpm, program_tag, NULL);

 	script = razor_rpm_get_indirect(installer->rpm, script_tag, NULL);

 	if (program == NULL && script == NULL) {

 		return 0;

 	} else if (program == NULL) {

 #if MSWIN_API

 		program = getenv("COMSPEC");

 		if (program) {

 			program = strchr(program, '=');

 			if (program)

 				program++;

 		}

 		if (!program)

 			program = "c:\\windows\\system32\\cmd.exe";

 #else

 		program = "/bin/sh";

 #endif

 	}

 #if HAVE_CHROOT

 	if (pipe(fd) < 0) {

 		fprintf(stderr, "failed to create pipe\n");

 		return -1;

 	}

 	pid = fork();

 	if (pid < 0) {

 		perror("failed to fork");

 	} else if (pid == 0) {

 		if (dup2(fd[0], STDIN_FILENO) < 0) {

 			perror("failed redirect stdin");

 			exit(-1);

 		}

 		if (close(fd[0]) < 0 || close(fd[1]) < 0) {

 			perror("failed to close pipe");

 			exit(-1);

 		}

 		if (chroot(installer->root) < 0) {

 			fprintf(stderr, "failed to chroot to %s: %s\n",

 				installer->root, strerror(errno));

 			exit(-1);

 		}

 		printf("executing program %s in chroot %s\n",

 		       program, installer->root);

 		if (execl(program, program, NULL)) {

 			fprintf(stderr, "failed to exec %s: %s\n", program,

 				strerror(errno));

 			exit(-1);

 		}

 	} else {

 		if (script && razor_write(fd[1], script, strlen(script)) < 0) {

 			perror("failed to pipe script");

 			return -1;

 		}

 		if (close(fd[0]) || close(fd[1])) {

 			perror("failed to close pipe");

 			return -1;

 		}

 		if (wait(&status) < 0) {

 			perror("wait for child failed");

 			return -1;

 		}

 		if (status)

 			printf("script exited with status %d\n", status);

 	}

 #else

 	fp = popen(program, "w");

 	if (fwrite(script, strlen(script), 1, fp) != 1) {

 		perror("failed to pipe script");

 		return -1;

 	}

 	pclose(fp);

 #endif

 	return 0;

 }

 static int

 installer_init(struct installer *installer)

 {

 	unsigned char *gz_header;

 	int method, flags, err;

 	gz_header = installer->rpm->payload;

 	if (gz_header[0] != 0x1f || gz_header[1] != 0x8b) {

 		fprintf(stderr, "payload section doesn't have gz header\n");

 		return -1;

 	}

 	method = gz_header[2];

 	flags = gz_header[3];

 	if (method != Z_DEFLATED || flags != 0) {

 		fprintf(stderr,

 			"unknown payload compression method or flags set\n");

 		return -1;

 	}

 	installer->stream.zalloc = NULL;

 	installer->stream.zfree = NULL;

 	installer->stream.opaque = NULL;

 	installer->stream.next_in  = gz_header + 10;

 	installer->stream.avail_in =

 		(installer->rpm->map + installer->rpm->size) -

 		(void *) installer->stream.next_in;

 	installer->stream.next_out = NULL;

 	installer->stream.avail_out = 0;

 	err = inflateInit2(&installer->stream, -MAX_WBITS);

 	if (err != Z_OK) {

 		fprintf(stderr, "inflateInit error: %d\n", err);

 		return -1;

 	}

 	return 0;

 }

 static int

 installer_finish(struct installer *installer)

 {

 	int err;

 	err = inflateEnd(&installer->stream);

 	if (err != Z_OK) {

 		fprintf(stderr, "inflateEnd error: %d\n", err);

 		return -1;

 	}

 	return 0;

 }

 static unsigned long

 fixed_hex_to_ulong(const char *hex, int length)

 {

 	long l;

 	int i;

 	for (i = 0, l = 0; i < length; i++) {

 		if (hex[i] < 'a')

 			l = l * 16 + hex[i] - '0';

 		else

 			l = l * 16 + hex[i] - 'a' + 10;

 	}

 	return l;

 }

 RAZOR_EXPORT int

 razor_rpm_install(struct razor_rpm *rpm, const char *root)

 {

 	struct installer installer;

 	struct cpio_file_header *header;

 	struct stat buf;

 	unsigned int mode;

 	char *path;

 	size_t filesize;

 	assert (rpm != NULL);

 	assert (root != NULL);

 	installer.rpm = rpm;

 	installer.root = root;

 	/* FIXME: Only do this before a transaction, not per rpm. */

 	if (*root && (stat(root, &buf) < 0 || !S_ISDIR(buf.st_mode))) {

 		fprintf(stderr,

 			"root installation directory \"%s\" does not exist\n",

 			root);

 		return -1;

 	}

 	if (installer_init(&installer))

 		return -1;

 	run_script(&installer, RPMTAG_PREINPROG, RPMTAG_PREIN);

 	while (installer.stream.avail_in > 0) {

 		installer.rest = sizeof *header;

 		if (installer_inflate(&installer))

 			return -1;

 		header = (struct cpio_file_header *) installer.buffer;

 		mode = fixed_hex_to_ulong(header->mode, sizeof header->mode);

 		filesize = fixed_hex_to_ulong(header->filesize,

 					      sizeof header->filesize);

 		installer.rest = fixed_hex_to_ulong(header->namesize,

 						    sizeof header->namesize);

 		if (installer_inflate(&installer) ||

 		    installer_align(&installer, 4))

 			return -1;

 		path = (char *) installer.buffer;

 		/* This convention is so lame... */

 		if (strcmp(path, "TRAILER!!!") == 0)

 			break;

 		installer.rest = filesize;

 		if (create_path(&installer, path + 1, mode) < 0)

 			return -1;

 		if (installer_align(&installer, 4))

 			return -1;

 	}

 	if (installer_finish(&installer))

 		return -1;

 	run_script(&installer, RPMTAG_POSTINPROG, RPMTAG_POSTIN);

 	return 0;

 }

 RAZOR_EXPORT int

 razor_rpm_close(struct razor_rpm *rpm)

 {

 	int err;

 	assert (rpm != NULL);

 	free(rpm->dirs);

 	err = razor_file_free_contents(rpm->map, rpm->size);

 	free(rpm);

 	return err;

 }

 RAZOR_EXPORT int

 razor_importer_add_rpm(struct razor_importer *importer, struct razor_rpm *rpm)

 {

 	const char *name, *version, *release, *arch;

 	const char *summary, *description, *url, *license;

 	const uint32_t *epoch;

 	char evr[128], buf[16];

 	assert (importer != NULL);

 	assert (rpm != NULL);

 	name = razor_rpm_get_indirect(rpm, RPMTAG_NAME, NULL);

 	epoch = razor_rpm_get_indirect(rpm, RPMTAG_EPOCH, NULL);

 	version = razor_rpm_get_indirect(rpm, RPMTAG_VERSION, NULL);

 	release = razor_rpm_get_indirect(rpm, RPMTAG_RELEASE, NULL);

 	arch = razor_rpm_get_indirect(rpm, RPMTAG_ARCH, NULL);

 	summary = razor_rpm_get_indirect(rpm, RPMTAG_SUMMARY, NULL);

 	description = razor_rpm_get_indirect(rpm, RPMTAG_DESCRIPTION, NULL);

 	url = razor_rpm_get_indirect(rpm, RPMTAG_URL, NULL);

 	license = razor_rpm_get_indirect(rpm, RPMTAG_LICENSE, NULL);

 	if (epoch) {

 		snprintf(buf, sizeof buf, "%lu", ntohl(*epoch));

 		razor_build_evr(evr, sizeof evr, buf, version, release);

 	} else {

 		razor_build_evr(evr, sizeof evr, NULL, version, release);

 	}

 	razor_importer_begin_package(importer, name, evr, arch);

 	razor_importer_add_details(importer, summary, description, url,

 				   license);

 	import_properties(importer, RAZOR_PROPERTY_REQUIRES, rpm,

 			  RPMTAG_REQUIRENAME,

 			  RPMTAG_REQUIREVERSION,

 			  RPMTAG_REQUIREFLAGS);

 	import_properties(importer, RAZOR_PROPERTY_PROVIDES, rpm,

 			  RPMTAG_PROVIDENAME,

 			  RPMTAG_PROVIDEVERSION,

 			  RPMTAG_PROVIDEFLAGS);

 	import_properties(importer, RAZOR_PROPERTY_OBSOLETES, rpm,

 			  RPMTAG_OBSOLETENAME,

 			  RPMTAG_OBSOLETEVERSION,

 			  RPMTAG_OBSOLETEFLAGS);

 	import_properties(importer, RAZOR_PROPERTY_CONFLICTS, rpm,

 			  RPMTAG_CONFLICTNAME,

 			  RPMTAG_CONFLICTVERSION,

 			  RPMTAG_CONFLICTFLAGS);

 	import_files(importer, rpm);

 	razor_importer_finish_package(importer);

 	return 0;

 }