rpm/lib/install.c

#include <alloca.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/signal.h>
#include <sys/stat.h>		/* needed for mkdir(2) prototype! */
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
#include <zlib.h>

#include "header.h"
#include "install.h"
#include "md5.h"
#include "misc.h"
#include "package.h"
#include "rpmerr.h"
#include "rpmlib.h"

enum instActions { CREATE, BACKUP, KEEP, SAVE, SKIP };
enum fileTypes { DIR, BDEV, CDEV, SOCK, PIPE, REG, LINK } ;

struct fileToInstall {
    char * fileName;
    int size;
} ;

struct replacedFile {
    int recOffset, fileNumber;
} ;

enum fileTypes whatis(short mode);
int filecmp(short mode1, char * md51, char * link1, 
	      short mode2, char * md52, char * link2);
enum instActions decideFileFate(char * filespec, short dbMode, char * dbMd5,
				char * dbLink, short newMode, char * newMd5,
				char * newLink);
static int installArchive(char * prefix, int fd, struct fileToInstall * files,
			  int fileCount, notifyFunction notify,
			  char ** installArchive);
static int packageAlreadyInstalled(rpmdb db, char * name, char * version, 
				   char * release, int * recOffset, int flags);
static int setFileOwnerships(char * prefix, char ** fileList, 
			     char ** fileOwners, char ** fileGroups, 
			     enum instActions * instActions, int fileCount);
static int setFileOwner(char * prefix, char * file, char * owner, 
			char * group);
static int createDirectories(char * prefix, char ** fileList, int fileCount);
static int mkdirIfNone(char * directory, mode_t perms);
static int instHandleSharedFiles(rpmdb db, int ignoreOffset, char ** fileList, 
			         char ** fileMd5List, int_16 * fileModeList,
				 char ** fileLinkList,
				 int fileCount, enum instActions * instActions, 
			 	 char ** prefixedFileList, int * notErrors,
				 struct replacedFile ** repListPtr, int flags);
static int fileCompare(const void * one, const void * two);
static int installSources(char * prefix, int fd, char ** specFilePtr);
static int markReplacedFiles(rpmdb db, struct replacedFile * replList);
static int ensureOlder(rpmdb db, char * name, char * newVersion, 
		       char * newRelease, int dbOffset);

/* 0 success */
/* 1 bad magic */
/* 2 error */
int rpmInstallSourcePackage(char * prefix, int fd, char ** specFile) {
    int rc, isSource;
    Header h;

    rc = pkgReadHeader(fd, &h, &isSource);
    if (rc) return rc;

    if (!isSource) {
	error(RPMERR_NOTSRPM, "source package expected, binary found");
	return 2;
    }

    if (h) freeHeader(h);

    return installSources(prefix, fd, specFile);
}

/* 0 success */
/* 1 bad magic */
/* 2 error */
int rpmInstallPackage(char * prefix, rpmdb db, int fd, int flags, 
		      notifyFunction notify, char * labelFormat) {
    int rc, isSource;
    char * name, * version, * release;
    Header h;
    int fileCount, type;
    char ** fileList;
    char ** fileOwners, ** fileGroups, ** fileMd5s, ** fileLinkList;
    uint_32 * fileFlagsList;
    uint_32 * fileSizesList;
    int_16 * fileModesList;
    int_32 installTime;
    char * fileStatesList;
    struct fileToInstall * files;
    enum instActions * instActions = NULL;
    int i;
    int archiveFileCount = 0;
    int installFile = 0;
    int normalState = 0;
    int otherOffset = 0;
    char * ext = NULL, * newpath;
    int prefixLength = strlen(prefix);
    char ** prefixedFileList = NULL;
    struct replacedFile * replacedList = NULL;
    char * sptr, * dptr;
    int length;
    dbIndexSet matches;
    int * oldVersions;
    int * intptr;
    int_8 thisArch, * pkgArch;

    oldVersions = alloca(sizeof(int));
    *oldVersions = 0;

    rc = pkgReadHeader(fd, &h, &isSource);
    if (rc) return rc;

    if (isSource) {
	/* We deal with source packages pretty badly. They should end
	   up in the database, and we should be smarter about installing
	   them. Old source packages are broken though, and this hack
	   is the easiest way. It's too bad the notify stuff doesn't work
	   though  */

	if (flags & INSTALL_TEST) {
	    message(MESS_DEBUG, "stopping install as we're running --test\n");
	    return 0;
	}

	if (h) freeHeader(h);

	return installSources(prefix, fd, NULL);
    }

    getEntry(h, RPMTAG_NAME, &type, (void **) &name, &fileCount);
    getEntry(h, RPMTAG_VERSION, &type, (void **) &version, &fileCount);
    getEntry(h, RPMTAG_RELEASE, &type, (void **) &release, &fileCount);

    /* make sure we're trying to install this on the proper architecture */
    thisArch = getArchNum();
    getEntry(h, RPMTAG_ARCH, &type, (void **) &pkgArch, &fileCount);
    if (thisArch != *pkgArch) {
	error(RPMERR_BADARCH, "package %s-%s-%s is for a different "
	      "architecture", name, version, release);
	freeHeader(h);
	return 2;
    }

    if (labelFormat) {
	printf(labelFormat, name, version, release);
	fflush(stdout);
    }

    message(MESS_DEBUG, "package: %s-%s-%s files test = %d\n", 
		name, version, release, flags & INSTALL_TEST);

    if (packageAlreadyInstalled(db, name, version, release, &otherOffset, 
				flags)) {
	freeHeader(h);
	return 2;
    }

    if (flags & INSTALL_UPGRADE) {
	/* 
	   We need to get a list of all old version of this package. We let
	   this install procede normally then, but:

		1) we don't report conflicts between the new package and
		   the old versions installed
		2) when we're done, we uninstall the old versions

	   Note if the version being installed is already installed, we don't
	   put that in the list -- that situation is handled normally.
	*/

	rc = rpmdbFindPackage(db, name, &matches);
	if (rc == -1) return 2;
	
	if (!rc) {
	    intptr = oldVersions = alloca((matches.count + 1) * sizeof(int));
	    for (i = 0; i < matches.count; i++) {
		if (matches.recs[i].recOffset != otherOffset) {
		    if (!(flags & INSTALL_UPGRADETOOLD)) 
			if (ensureOlder(db, name, version, release, 
					matches.recs[i].recOffset)) 
			    return 2;
		    *intptr++ = matches.recs[i].recOffset;
		}
	    }
	    *intptr++ = 0;
	}
    }

    fileList = NULL;
    if (getEntry(h, RPMTAG_FILENAMES, &type, (void **) &fileList, 
		 &fileCount)) {

	instActions = alloca(sizeof(enum instActions) * fileCount);
	prefixedFileList = alloca(sizeof(char *) * fileCount);

	getEntry(h, RPMTAG_FILEMD5S, &type, (void **) &fileMd5s, &fileCount);
	getEntry(h, RPMTAG_FILEFLAGS, &type, (void **) &fileFlagsList, 
		 &fileCount);
	getEntry(h, RPMTAG_FILEMODES, &type, (void **) &fileModesList, 
		 &fileCount);
	getEntry(h, RPMTAG_FILELINKTOS, &type, (void **) &fileLinkList, 
		 &fileCount);

	/* check for any config files that already exist. If they do, plan
	   on making a backup copy. If that's not the right thing to do
	   instHandleSharedFiles() below will take care of the problem */
	for (i = 0; i < fileCount; i++) {
	    if (prefixLength > 1) {
		prefixedFileList[i] = alloca(strlen(fileList[i]) + 
				prefixLength + 3);
		strcpy(prefixedFileList[i], prefix);
		strcat(prefixedFileList[i], "/");
		strcat(prefixedFileList[i], fileList[i]);
	    } else 
		prefixedFileList[i] = fileList[i];

	    instActions[i] = CREATE;
	    if ((fileFlagsList[i] & RPMFILE_CONFIG) &&
		!S_ISDIR(fileModesList[i])) {
		if (exists(prefixedFileList[i])) {
		    message(MESS_DEBUG, "%s exists - backing up\n", 
				prefixedFileList[i]);
		    instActions[i] = BACKUP;
		}
	    }

	    if ((fileFlagsList[i] & RPMFILE_DOC) && (flags & INSTALL_NODOCS))
		instActions[i] = SKIP;
	}

	rc = instHandleSharedFiles(db, 0, fileList, fileMd5s, fileModesList,
				   fileLinkList, fileCount, instActions, 
				   prefixedFileList, oldVersions, 
				   &replacedList, flags);

	free(fileMd5s);
	free(fileLinkList);
	if (rc) {
	    if (replacedList) free(replacedList);
	    free(fileList);
	    return 2;
	}
    }
    
    if (flags & INSTALL_TEST) {
	message(MESS_DEBUG, "stopping install as we're running --test\n");
	free(fileList);
	if (replacedList) free(replacedList);
	return 0;
    }

    message(MESS_DEBUG, "running preinstall script (if any)\n");
    if (runScript(prefix, h, RPMTAG_PREIN, flags & INSTALL_NOSCRIPTS)) {
	free(fileList);
	if (replacedList) free(replacedList);
	return 2;
    }

    if (fileList) {

	if (createDirectories(prefix, fileList, fileCount)) {
	    freeHeader(h);
	    free(fileList);
	    if (replacedList) free(replacedList);
	    return 2;
	}

	getEntry(h, RPMTAG_FILESIZES, &type, (void **) &fileSizesList, 
		 &fileCount);

	files = alloca(sizeof(struct fileToInstall) * fileCount);
	fileStatesList = malloc(sizeof(char) * fileCount);
	for (i = 0; i < fileCount; i++) {
	    switch (instActions[i]) {
	      case BACKUP:
		ext = ".rpmorig";
		installFile = 1;
		normalState = 1;
		break;

	      case SAVE:
		ext = ".rpmsave";
		installFile = 1;
		normalState = 1;
		break;

	      case CREATE:
		installFile = 1;
		normalState = 1;
		ext = NULL;
		break;

	      case KEEP:
		installFile = 0;
		normalState = 1;
		ext = NULL;
		break;

	      case SKIP:
		installFile = 0;
		normalState = 0;
		ext = NULL;
		break;
	    }

	    if (ext) {
		newpath = malloc(strlen(prefixedFileList[i]) + 20);
		strcpy(newpath, prefixedFileList[i]);
		strcat(newpath, ext);
		message(MESS_WARNING, "%s saved as %s\n", prefixedFileList[i], 
			newpath);
		/* XXX this message is a bad idea - it'll make glint more
		   difficult */

		if (rename(prefixedFileList[i], newpath)) {
		    error(RPMERR_RENAME, "rename of %s to %s failed: %s\n",
			  prefixedFileList[i], newpath, strerror(errno));
		    if (replacedList) free(replacedList);
		    return 2;
		}

		free(newpath);
	    }

	    if (installFile) {
 		/* 1) we skip over the leading /
		   2) we have to escape globbing characters :-( */

		length = strlen(fileList[i]);
		files[archiveFileCount].fileName = alloca((length * 2) + 1);
		dptr = files[archiveFileCount].fileName;
		for (sptr = fileList[i] + 1; *sptr; sptr++) {
		    switch (*sptr) {
		      case '*': case '[': case ']': case '?': case '\\':
			*dptr++ = '\\';
			/*fallthrough*/
		      default:
			*dptr++ = *sptr;
		    }
		}
		*dptr++ = *sptr;

		files[archiveFileCount].size = fileSizesList[i];

		archiveFileCount++;
	    }

	    if (normalState) 
		fileStatesList[i] = RPMFILE_STATE_NORMAL;
	    else
		fileStatesList[i] = RPMFILE_STATE_NOTINSTALLED;
	}

	/* the file pointer for fd is pointing at the cpio archive */
	if (installArchive(prefix, fd, files, archiveFileCount, notify, NULL)) {
	    freeHeader(h);
	    free(fileList);
	    if (replacedList) free(replacedList);
	    return 2;
	}

	if (getEntry(h, RPMTAG_FILEUSERNAME, &type, (void **) &fileOwners, 
		     &fileCount)) {
	    if (getEntry(h, RPMTAG_FILEGROUPNAME, &type, (void **) &fileGroups, 
			 &fileCount)) {
		if (setFileOwnerships(prefix, fileList, fileOwners, fileGroups, 
				instActions, fileCount)) {
		    free(fileOwners);
		    free(fileGroups);
		    free(fileList);
		    free(fileStatesList);
		    if (replacedList) free(replacedList);

		    return 2;
		}
		free(fileGroups);
	    }
	    free(fileOwners);
	}
	free(fileList);

	addEntry(h, RPMTAG_FILESTATES, CHAR_TYPE, fileStatesList, fileCount);
	free(fileStatesList);

	installTime = time(NULL);
	addEntry(h, RPMTAG_INSTALLTIME, INT32_TYPE, &installTime, 1);
    }

    if (replacedList) {
	rc = markReplacedFiles(db, replacedList);
	free(replacedList);

	if (rc) return rc;
    }

    /* if this package has already been installed, remove it from the database
       before adding the new one */
    if (otherOffset) {
        rpmdbRemove(db, otherOffset, 1);
    }

    if (rpmdbAdd(db, h)) {
	freeHeader(h);
	return 2;
    }

    message(MESS_DEBUG, "running postinstall script (if any)\n");

    if (runScript(prefix, h, RPMTAG_POSTIN, flags & INSTALL_NOSCRIPTS)) {
	return 2;
    }

    if (flags & INSTALL_UPGRADE) {
	message(MESS_DEBUG, "removing old versions of package\n");
	intptr = oldVersions;
	while (*intptr) {
	    rpmRemovePackage(prefix, db, *intptr, 0);
	    intptr++;
	}
    }

    return 0;
}

#define BLOCKSIZE 1024

static int installArchive(char * prefix, int fd, struct fileToInstall * files,
			  int fileCount, notifyFunction notify, 
			  char ** specFile) {
    gzFile stream;
    char buf[BLOCKSIZE];
    pid_t child;
    int p[2];
    int statusPipe[2];
    int bytesRead;
    int bytes;
    int status;
    int cpioFailed = 0;
    void * oldhandler;
    char * cpioBinary;
    int needSecondPipe;
    char line[1024];
    int j;
    int i = 0;
    unsigned long totalSize = 0;
    unsigned long sizeInstalled = 0;
    struct fileToInstall fileInstalled;
    struct fileToInstall * file;
    char * chptr;
    char ** args;
    int len;
    int childDead = 0;

    /* fd should be a gzipped cpio archive */

    needSecondPipe = (notify != NULL) || specFile;

    if (specFile) *specFile = NULL;
    
    if (access("/bin/cpio",  X_OK))  {
	if (access("/usr/bin/cpio",  X_OK))  {
	    error(RPMERR_CPIO, "cpio cannot be found in /bin or /usr/sbin");
	    return 1;
	} else 
	    cpioBinary = "/usr/bin/cpio";
    } else
	cpioBinary = "/bin/cpio";

    args = alloca(sizeof(char *) * (fileCount + 10));

    args[i++] = cpioBinary;
    args[i++] = "--extract";
    args[i++] = "--unconditional";
    args[i++] = "--preserve-modification-time";
    args[i++] = "--make-directories";
    args[i++] = "--quiet";

    if (needSecondPipe)
	args[i++] = "--verbose";

    /* note - if fileCount == 0, all files get installed */

    for (j = 0; j < fileCount; j++)
	args[i++] = files[j].fileName;

    args[i++] = NULL;
    
    stream = gzdopen(fd, "r");
    pipe(p);

    if (needSecondPipe) {
	pipe(statusPipe);
	for (i = 0; i < fileCount; i++)
	    totalSize += files[i].size;
	qsort(files, fileCount, sizeof(struct fileToInstall), fileCompare);
    }

    oldhandler = signal(SIGPIPE, SIG_IGN);

    child = fork();
    if (!child) {
	chdir(prefix);

	close(p[1]);   /* we don't need to write to it */
	close(0);      /* stdin will come from the pipe instead */
	dup2(p[0], 0);
	close(p[0]);

	if (needSecondPipe) {
	    close(statusPipe[0]);   /* we don't need to read from it*/
	    close(2);      	    /* stderr will go to a pipe instead */
	    dup2(statusPipe[1], 2);
	    close(statusPipe[1]);
	}

	execv(args[0], args);

	exit(-1);
    }

    close(p[0]);
    if (needSecondPipe) {
	close(statusPipe[1]);
	fcntl(statusPipe[0], F_SETFL, O_NONBLOCK);
    }

    do {
	if (waitpid(child, &status, WNOHANG)) childDead = 1;
	
	bytesRead = gzread(stream, buf, sizeof(buf));
	if (write(p[1], buf, bytesRead) != bytesRead) {
	     cpioFailed = 1;
	     childDead = 1;
	     kill(SIGTERM, child);
	}

	if (needSecondPipe) {
	    bytes = read(statusPipe[0], line, sizeof(line));

	    while (bytes > 0) {
		fileInstalled.fileName = line;

		while ((chptr = (strchr(fileInstalled.fileName, '\n')))) {
		    *chptr = '\0';

		    message(MESS_DEBUG, "file \"%s\" complete\n", 
				fileInstalled.fileName);

		    if (notify) {
			file = bsearch(&fileInstalled, files, fileCount, 
				       sizeof(struct fileToInstall), 
				       fileCompare);
			if (file) {
			    sizeInstalled += file->size;
			    notify(sizeInstalled, totalSize);
			}
		    }

		    if (specFile) {
			len = strlen(fileInstalled.fileName);
			if (fileInstalled.fileName[len - 1] == 'c' &&
			    fileInstalled.fileName[len - 2] == 'e' &&
			    fileInstalled.fileName[len - 3] == 'p' &&
			    fileInstalled.fileName[len - 4] == 's' &&
			    fileInstalled.fileName[len - 5] == '.') {

			    if (*specFile) free(*specFile);
			    *specFile = strdup(fileInstalled.fileName);
			}
		    }
		 
		    fileInstalled.fileName = chptr + 1;
		}

		bytes = read(statusPipe[0], line, sizeof(line));
	    }
	}
    } while (!childDead);

    gzclose(stream);
    close(p[1]);
    if (needSecondPipe) close(statusPipe[0]);
    signal(SIGPIPE, oldhandler);
    waitpid(child, &status, 0);

    if (cpioFailed || !WIFEXITED(status) || WEXITSTATUS(status)) {
	/* this would probably be a good place to check if disk space
	   was used up - if so, we should return a different error */
	error(RPMERR_CPIO, "unpacking of archive failed");
	return 1;
    }

    if (notify)
	notify(totalSize, totalSize);

    return 0;
}

static int packageAlreadyInstalled(rpmdb db, char * name, char * version, 
				   char * release, int * offset, int flags) {
    char * secVersion, * secRelease;
    Header sech;
    int i;
    dbIndexSet matches;
    int type, count;

    if (!rpmdbFindPackage(db, name, &matches)) {
	for (i = 0; i < matches.count; i++) {
	    sech = rpmdbGetRecord(db, matches.recs[i].recOffset);
	    if (!sech) {
		return 1;
	    }

	    getEntry(sech, RPMTAG_VERSION, &type, (void **) &secVersion, 
			&count);
	    getEntry(sech, RPMTAG_RELEASE, &type, (void **) &secRelease, 
			&count);

	    if (!strcmp(secVersion, version) && !strcmp(secRelease, release)) {
		*offset = matches.recs[i].recOffset;
		if (!(flags & INSTALL_REPLACEPKG)) {
		    error(RPMERR_PKGINSTALLED, 
			  "package %s-%s-%s is already installed",
			  name, version, release);
		    freeHeader(sech);
		    return 1;
		}
	    }

	    freeHeader(sech);
	}
    }

    return 0;
}

static int setFileOwnerships(char * prefix, char ** fileList, 
			     char ** fileOwners, char ** fileGroups, 
			     enum instActions * instActions, int fileCount) {
    int i;

    message(MESS_DEBUG, "setting file owners and groups by name (not id)\n");

    for (i = 0; i < fileCount; i++) {
	if (instActions[i] != SKIP) {
	    /* ignore errors here - setFileOwner handles them reasonable
	       and we want to keep running */
	    setFileOwner(prefix, fileList[i], fileOwners[i], fileGroups[i]);
	}
    }

    return 0;
}

/* setFileOwner() is really poorly implemented. It really ought to use 
   hash tables. I just made the guess that most files would be owned by 
   root or the same person/group who owned the last file. Those two values 
   are cached, everything else is looked up via getpw() and getgr() functions. 
   If this performs too poorly I'll have to implement it properly :-( */

static int setFileOwner(char * prefix, char * file, char * owner, 
			char * group) {
    static char * lastOwner = NULL, * lastGroup = NULL;
    static uid_t lastUID;
    static gid_t lastGID;
    uid_t uid = 0;
    gid_t gid = 0;
    struct passwd * pwent;
    struct group * grent;
    char * filespec;

    filespec = alloca(strlen(prefix) + strlen(file) + 5);
    strcpy(filespec, prefix);
    strcat(filespec, "/");
    strcat(filespec, file);

    if (!strcmp(owner, "root"))
	uid = 0;
    else if (lastOwner && !strcmp(lastOwner, owner))
	uid = lastUID;
    else {
	pwent = getpwnam(owner);
	if (!pwent) {
	    error(RPMERR_NOUSER, "user %s does not exist - using root", owner);
	    uid = 0;
	} else {
	    uid = pwent->pw_uid;
	    if (lastOwner) free(lastOwner);
	    lastOwner = strdup(owner);
	    lastUID = uid;
	}
    }

    if (!strcmp(group, "root"))
	gid = 0;
    else if (lastGroup && !strcmp(lastGroup, group))
	gid = lastGID;
    else {
	grent = getgrnam(group);
	if (!grent) {
	    error(RPMERR_NOGROUP, "group %s does not exist - using root", 
			group);
	    gid = 0;
	} else {
	    gid = grent->gr_gid;
	    if (lastGroup) free(lastGroup);
	    lastGroup = strdup(owner);
	    lastGID = gid;
	}
    }
	
    message(MESS_DEBUG, "%s owned by %s (%d), group %s (%d)\n", filespec,
	    owner, uid, group, gid);
    if (chown(filespec, uid, gid)) {
	error(RPMERR_CHOWN, "cannot set owner and group for %s - %s\n",
		filespec, strerror(errno));
	/* screw with the permissions so it's not SUID and 0.0 */
	chmod(filespec, 0644);
	return 1;
    }

    return 0;
}

/* This could be more efficient. A brute force tokenization and mkdir's
   seems like horrible overkill. I did make it know better then trying to 
   create the same directory sintrg twice in a row though. That should make it 
   perform adequatally thanks to the sorted filelist.

   This could create directories that should be symlinks :-( RPM building
   should probably resolve symlinks in paths.

   This creates directories which are always 0755, despite the current umask */

static int createDirectories(char * prefix, char ** fileList, int fileCount) {
    int i;
    char * lastDirectory;
    char * buffer;
    int bufferLength;
    int prefixLength = strlen(prefix);
    int neededLength;
    char * chptr;

    lastDirectory = malloc(1);
    lastDirectory[0] = '\0';

    bufferLength = 1000;		/* should be more then adequate */
    buffer = malloc(bufferLength);

    for (i = 0; i < fileCount; i++) {
	neededLength = prefixLength + 5 + strlen(fileList[i]);
	if (neededLength > bufferLength) { 
	    free(buffer);
	    bufferLength = neededLength * 2;
	    buffer = malloc(bufferLength);
	}
	strcpy(buffer, prefix);
	strcat(buffer, "/");
	strcat(buffer, fileList[i]);
	
	for (chptr = buffer + strlen(buffer) - 1; *chptr; chptr--) {
	    if (*chptr == '/') break;
	}

	if (! *chptr) continue;		/* no path, just filename */
	if (chptr == buffer) continue;  /* /filename - no directories */

	*chptr = '\0';			/* buffer is now just directories */

	if (!strcmp(buffer, lastDirectory)) continue;
	
	for (chptr = buffer + 1; *chptr; chptr++) {
	    if (*chptr == '/') {
		if (*(chptr -1) != '/') {
		    *chptr = '\0';
		    if (mkdirIfNone(buffer, 0755)) {
			free(lastDirectory);
			free(buffer);
			return 1;
		    }
		    *chptr = '/';
		}
	    }
	}

	if (mkdirIfNone(buffer, 0755)) {
	    free(lastDirectory);
	    free(buffer);
	    return 1;
	}

	free(lastDirectory);
	lastDirectory = strdup(buffer);
    }

    free(lastDirectory);
    free(buffer);

    return 0;
}

static int mkdirIfNone(char * directory, mode_t perms) {
    int rc;
    char * chptr;

    /* if the path is '/' we get ENOFILE not found" from mkdir, rather
       then EEXIST which is weird */
    for (chptr = directory; *chptr; chptr++)
	if (*chptr != '/') break;
    if (!*chptr) return 0;

    if (exists(directory)) return 0;

    message(MESS_DEBUG, "trying to make %s\n", directory);

    rc = mkdir(directory, perms);
    if (!rc || errno == EEXIST) return 0;

    chmod(directory, perms);  /* this should not be modified by the umask */

    error(RPMERR_MKDIR, "failed to create %s - %s\n", directory, 
	  strerror(errno));

    return errno;
}

int filecmp(short mode1, char * md51, char * link1, 
	      short mode2, char * md52, char * link2) {
    enum fileTypes what1, what2;

    what1 = whatis(mode1);
    what2 = whatis(mode2);

    if (what1 != what2) return 1;

    if (what1 == LINK)
	return strcmp(link1, link2);
    else if (what1 == REG)
	return strcmp(md51, md52);

    return 0;
}

enum instActions decideFileFate(char * filespec, short dbMode, char * dbMd5,
				char * dbLink, short newMode, char * newMd5,
				char * newLink) {
    char buffer[1024];
    char * dbAttr, * newAttr;
    enum fileTypes dbWhat, newWhat, diskWhat;
    struct stat sb;
    int i;

    if (lstat(filespec, &sb)) {
	/* the file doesn't exist on the disk - might as well make it */
	return CREATE;
    }

    diskWhat = whatis(sb.st_mode);
    dbWhat = whatis(dbMode);
    newWhat = whatis(newMode);

    if (diskWhat != newWhat) {
	message(MESS_DEBUG, "	file type on disk is different then package - "
			"saving\n");
	return SAVE;
    } else if (newWhat != dbWhat && diskWhat != dbWhat) {
	message(MESS_DEBUG, "	file type in database is different then disk"
			" and package file - saving\n");
	return SAVE;
    } else if (dbWhat != newWhat) {
	message(MESS_DEBUG, "	file type changed - replacing\n");
	return CREATE;
    } else if (dbWhat != LINK && dbWhat != REG) {
	message(MESS_DEBUG, "	can't check file for changes - replacing\n");
	return CREATE;
    }

    if (dbWhat == REG) {
	if (mdfile(filespec, buffer)) {
	    /* assume the file has been removed, don't freak */
	    message(MESS_DEBUG, "	file not present - creating");
	    return CREATE;
	}
	dbAttr = dbMd5;
	newAttr = newMd5;
    } else /* dbWhat == LINK */ {
	i = readlink(filespec, buffer, sizeof(buffer) - 1);
	if (i == -1) {
	    /* assume the file has been removed, don't freak */
	    message(MESS_DEBUG, "	file not present - creating");
	    return CREATE;
	}
	dbAttr = dbLink;
	newAttr = newLink;
     }

    /* this order matters - we'd prefer to CREATE the file is at all 
       possible in case something else (like the timestamp) has changed */

    if (!strcmp(dbAttr, buffer)) {
	/* this config file has never been modified, so 
	   just replace it */
	message(MESS_DEBUG, "	old == current, replacing "
		"with new version\n");
	return CREATE;
    }

    if (!strcmp(dbAttr, newAttr)) {
	/* this file is the same in all versions of this package */
	message(MESS_DEBUG, "	old == new, keeping\n");
	return KEEP;
    }

    /* the config file on the disk has been modified, but
       the ones in the two packages are different. It would
       be nice if RPM was smart enough to at least try and
       merge the difference ala CVS, but... */
    message(MESS_DEBUG, "	files changed too much - backing up\n");
	    
    return SAVE;
}

/* return 0: okay, continue install */
/* return 1: problem, halt install */

static int instHandleSharedFiles(rpmdb db, int ignoreOffset, char ** fileList, 
			         char ** fileMd5List, int_16 * fileModesList,
				 char ** fileLinkList,
				 int fileCount, enum instActions * instActions, 
			 	 char ** prefixedFileList, int * notErrors,
				 struct replacedFile ** repListPtr, int flags) {
    struct sharedFile * sharedList;
    int secNum, mainNum;
    int sharedCount;
    int i, type;
    int * intptr;
    Header sech = NULL;
    int secOffset = 0;
    int secFileCount;
    char ** secFileMd5List, ** secFileList, ** secFileLinksList;
    char * secFileStatesList;
    int_16 * secFileModesList;
    uint_32 * secFileFlagsList;
    char * name, * version, * release;
    int rc = 0;
    struct replacedFile * replacedList;
    int numReplacedFiles, numReplacedAlloced;

    if (findSharedFiles(db, 0, fileList, fileCount, &sharedList, 
			&sharedCount)) {
	return 1;
    }
    
    numReplacedAlloced = 10;
    numReplacedFiles = 0;
    replacedList = malloc(sizeof(*replacedList) * numReplacedAlloced);

    for (i = 0; i < sharedCount; i++) {
	if (sharedList[i].secRecOffset == ignoreOffset) continue;

	if (secOffset != sharedList[i].secRecOffset) {
	    if (secOffset) {
		freeHeader(sech);
		free(secFileMd5List);
		free(secFileLinksList);
		free(secFileList);
	    }

	    secOffset = sharedList[i].secRecOffset;
	    sech = rpmdbGetRecord(db, secOffset);
	    if (!sech) {
		error(RPMERR_DBCORRUPT, "cannot read header at %d for "
		      "uninstall", secOffset);
		rc = 1;
		break;
	    }

	    getEntry(sech, RPMTAG_NAME, &type, (void **) &name, 
		     &secFileCount);
	    getEntry(sech, RPMTAG_VERSION, &type, (void **) &version, 
		     &secFileCount);
	    getEntry(sech, RPMTAG_RELEASE, &type, (void **) &release, 
		     &secFileCount);

	    message(MESS_DEBUG, "package %s-%s-%s contain shared files\n", 
		    name, version, release);

	    if (!getEntry(sech, RPMTAG_FILENAMES, &type, 
			  (void **) &secFileList, &secFileCount)) {
		error(RPMERR_DBCORRUPT, "package %s contains no files\n",
		      name);
		freeHeader(sech);
		rc = 1;
		break;
	    }

	    getEntry(sech, RPMTAG_FILESTATES, &type, 
		     (void **) &secFileStatesList, &secFileCount);
	    getEntry(sech, RPMTAG_FILEMD5S, &type, 
		     (void **) &secFileMd5List, &secFileCount);
	    getEntry(sech, RPMTAG_FILEFLAGS, &type, 
		     (void **) &secFileFlagsList, &secFileCount);
	    getEntry(sech, RPMTAG_FILELINKTOS, &type, 
		     (void **) &secFileLinksList, &secFileCount);
	    getEntry(sech, RPMTAG_FILEMODES, &type, 
		     (void **) &secFileModesList, &secFileCount);
	}

 	secNum = sharedList[i].secFileNumber;
	mainNum = sharedList[i].mainFileNumber;

	message(MESS_DEBUG, "file %s is shared\n", secFileList[secNum]);

	intptr = notErrors;
	while (*intptr) {
	    if (*intptr == sharedList[i].secRecOffset) break;
	    intptr++;
	}

	/* if this instance of the shared file is already recorded as
	   replaced, just forget about it */
	if (secFileStatesList[sharedList[i].secFileNumber] == 
		RPMFILE_STATE_REPLACED) {
	    message(MESS_DEBUG, "	old version already replaced\n");
	    continue;
	} else if (secFileStatesList[sharedList[i].secFileNumber] == 
		RPMFILE_STATE_NOTINSTALLED) {
	    message(MESS_DEBUG, "	other version never installed\n");
	    continue;
	}

	if (filecmp(fileModesList[mainNum], fileMd5List[mainNum], 
		    fileLinkList[mainNum], secFileModesList[secNum],
		    secFileMd5List[secNum], secFileLinksList[secNum])) {
	    if (!(flags & INSTALL_REPLACEFILES) && !(*intptr)) {
		error(RPMERR_PKGINSTALLED, "%s conflicts with file from "
		      "%s-%s-%s", fileList[sharedList[i].mainFileNumber],
		      name, version, release);
		rc = 1;
	    } else {
		if (numReplacedFiles == numReplacedAlloced) {
		    numReplacedAlloced += 10;
		    replacedList = realloc(replacedList, 
					   sizeof(*replacedList) * 
					       numReplacedAlloced);
		}
	       
		replacedList[numReplacedFiles].recOffset = 
		    sharedList[i].secRecOffset;
		replacedList[numReplacedFiles].fileNumber = 	
		    sharedList[i].secFileNumber;
		numReplacedFiles++;

		message(MESS_DEBUG, "%s from %s-%s-%s will be replaced\n", 
			fileList[sharedList[i].mainFileNumber],
			name, version, release);
	    }
	}

	/* if this is a config file, we need to be carefull here */
	if (secFileFlagsList[sharedList[i].secFileNumber] & RPMFILE_CONFIG) {
	    instActions[sharedList[i].mainFileNumber] = 
		decideFileFate(fileList[mainNum], secFileModesList[secNum],
			       secFileMd5List[secNum], secFileLinksList[secNum],
			       fileModesList[mainNum], fileMd5List[mainNum],
			       fileLinkList[mainNum]);
	}
    }

    if (secOffset) {
	freeHeader(sech);
	free(secFileMd5List);
	free(secFileLinksList);
	free(secFileList);
    }

    free(sharedList);
   
    if (!numReplacedFiles) 
	free(replacedList);
    else {
	replacedList[numReplacedFiles].recOffset = 0;  /* mark the end */
	*repListPtr = replacedList;
    }

    return rc;
}

static int fileCompare(const void * one, const void * two) {
    return strcmp(((struct fileToInstall *) one)->fileName,
		  ((struct fileToInstall *) two)->fileName);
}


static int installSources(char * prefix, int fd, char ** specFilePtr) {
    char * specFile;
    char * sourceDir, * specDir;
    char * realSourceDir, * realSpecDir;
    char * instSpecFile, * correctSpecFile;

    message(MESS_DEBUG, "installing a source package\n");

    sourceDir = getVar(RPMVAR_SOURCEDIR);
    specDir = getVar(RPMVAR_SPECDIR);

    realSourceDir = alloca(strlen(prefix) + strlen(sourceDir) + 2);
    strcpy(realSourceDir, prefix);
    strcat(realSourceDir, "/");
    strcat(realSourceDir, sourceDir);

    realSpecDir = alloca(strlen(prefix) + strlen(specDir) + 2);
    strcpy(realSpecDir, prefix);
    strcat(realSpecDir, "/");
    strcat(realSpecDir, specDir);

    message(MESS_DEBUG, "sources in: %s\n", realSourceDir);
    message(MESS_DEBUG, "spec file in: %s\n", realSpecDir);

    if (installArchive(realSourceDir, fd, NULL, 0, NULL, &specFile)) {
	return 1;
    }

    if (!specFile) {
	error(RPMERR_NOSPEC, "source package contains no .spec file\n");
	return 1;
    }

    /* This logic doesn't work is realSpecDir and realSourceDir are on
       different filesystems XXX */
    instSpecFile = alloca(strlen(realSourceDir) + strlen(specFile) + 2);
    strcpy(instSpecFile, realSourceDir);
    strcat(instSpecFile, "/");
    strcat(instSpecFile, specFile);

    correctSpecFile = alloca(strlen(realSpecDir) + strlen(specFile) + 2);
    strcpy(correctSpecFile, realSpecDir);
    strcat(correctSpecFile, "/");
    strcat(correctSpecFile, specFile);

    message(MESS_DEBUG, "renaming %s to %s\n", instSpecFile, correctSpecFile);
    if (rename(instSpecFile, correctSpecFile)) {
	error(RPMERR_RENAME, "rename of %s to %s failed: %s\n",
		instSpecFile, correctSpecFile, strerror(errno));
	return 1;
    }

    if (specFilePtr)
	*specFilePtr = strdup(correctSpecFile);

    return 0;
}

static int markReplacedFiles(rpmdb db, struct replacedFile * replList) {
    struct replacedFile * fileInfo;
    Header secHeader = NULL, sh;
    char * secStates;
    int type, count;
    
    int secOffset = 0;

    for (fileInfo = replList; fileInfo->recOffset; fileInfo++) {
	if (secOffset != fileInfo->recOffset) {
	    if (secHeader) {
		/* ignore errors here - just do the best we can */

		rpmdbUpdateRecord(db, secOffset, secHeader);
		freeHeader(secHeader);
	    }

	    secOffset = fileInfo->recOffset;
	    sh = rpmdbGetRecord(db, secOffset);
	    if (!sh) {
		secOffset = 0;
	    } else {
		secHeader = copyHeader(sh);	/* so we can modify it */
		freeHeader(sh);
	    }

	    getEntry(secHeader, RPMTAG_FILESTATES, &type, (void **) &secStates, 
		     &count);
	}

	/* by now, secHeader is the right header to modify, secStates is
	   the right states list to modify  */
	
	secStates[fileInfo->fileNumber] = RPMFILE_STATE_REPLACED;
    }

    if (secHeader) {
	/* ignore errors here - just do the best we can */

	rpmdbUpdateRecord(db, secOffset, secHeader);
	freeHeader(secHeader);
    }

    return 0;
}

static int ensureOlder(rpmdb db, char * name, char * newVersion, 
		       char * newRelease, int dbOffset) {
    Header h;
    char * oldVersion, * oldRelease;
    int rc, result;
    int type, count;

    h = rpmdbGetRecord(db, dbOffset);
    if (!h) return 1;

    getEntry(h, RPMTAG_VERSION, &type, (void **) &oldVersion, &count);
    getEntry(h, RPMTAG_RELEASE, &type, (void **) &oldRelease, &count);

    result = vercmp(oldVersion, newVersion);
    if (result < 0)
	rc = 0;
    else if (result > 0) 
	rc = 1;
    else {
	result = vercmp(oldRelease, newRelease);
	if (result < 0)
	    rc = 0;
	else
	    rc = 1;
    }

    if (rc) 
	error(RPMERR_OLDPACKAGE, "package %s-%s-%s (which is newer) is already"
		" installed", name, oldVersion, oldRelease);

    freeHeader(h);

    return rc;
}

enum fileTypes whatis(short mode) {
    enum fileTypes result;

    if (S_ISDIR(mode))
	result = DIR;
    else if (S_ISCHR(mode))
	result = CDEV;
    else if (S_ISBLK(mode))
	result = BDEV;
    else if (S_ISLNK(mode))
	result = LINK;
    else if (S_ISSOCK(mode))
	result = SOCK;
    else if (S_ISFIFO(mode))
	result = PIPE;
    else
	result = REG;
 
    return result;
}