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lib/fs.c

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/*@-mods@*/
#include "system.h"
#include "rpmlib.h"
#include "rpmmacro.h"   /* XXX for rpmGetPath */
#include "debug.h"

#define MNT_DEV_PREFIX  "/mnt/"
#define MNT_DEV_PREFIX_LENGTH   (sizeof(MNT_DEV_PREFIX)-1)

/*@-usereleased -onlytrans@*/

struct fsinfo {
/*@only@*/ const char * mntPoint;       
    dev_t dev;                          
    int rdonly;                         
};

/*@unchecked@*/
/*@only@*/ /*@null@*/ static struct fsinfo * filesystems = NULL;
/*@unchecked@*/
/*@only@*/ /*@null@*/ static const char ** fsnames = NULL;
/*@unchecked@*/
static int numFilesystems = 0;

void freeFilesystems(void)
{
    if (filesystems) {
        int i;
        for (i = 0; i < numFilesystems; i++)
            filesystems[i].mntPoint = _free(filesystems[i].mntPoint);
        filesystems = _free(filesystems);
    }
    if (fsnames) {
#if 0   /* XXX leak/segfault on exit of "rpm -qp --qf '%{#fsnames}' pkg" */
        free(fsnames);
#endif
        fsnames = NULL;
    }
    numFilesystems = 0;
}

#if HAVE_MNTCTL

/* modeled after sample code from Till Bubeck */

#include <sys/mntctl.h>
#include <sys/vmount.h>

/* 
 * There is NO mntctl prototype in any header file of AIX 3.2.5! 
 * So we have to declare it by ourself...
 */
int mntctl(int command, int size, char *buffer);

static int getFilesystemList(void)
        /*@*/
{
    int size;
    void * buf;
    struct vmount * vm;
    struct stat sb;
    int rdonly = 0;
    int num;
    int fsnameLength;
    int i;

    num = mntctl(MCTL_QUERY, sizeof(size), (char *) &size);
    if (num < 0) {
        rpmError(RPMERR_MTAB, _("mntctl() failed to return size: %s\n"), 
                 strerror(errno));
        return 1;
    }

    /*
     * Double the needed size, so that even when the user mounts a 
     * filesystem between the previous and the next call to mntctl
     * the buffer still is large enough.
     */
    size *= 2;

    buf = alloca(size);
    num = mntctl(MCTL_QUERY, size, buf);
    if ( num <= 0 ) {
        rpmError(RPMERR_MTAB, _("mntctl() failed to return mount points: %s\n"), 
                 strerror(errno));
        return 1;
    }

    numFilesystems = num;

    filesystems = xcalloc((numFilesystems + 1), sizeof(*filesystems));
    fsnames = xcalloc((numFilesystems + 1), sizeof(char *));
    
    for (vm = buf, i = 0; i < num; i++) {
        char *fsn;
        fsnameLength = vm->vmt_data[VMT_STUB].vmt_size;
        fsn = xmalloc(fsnameLength + 1);
        strncpy(fsn, (char *)vm + vm->vmt_data[VMT_STUB].vmt_off, 
                fsnameLength);

        filesystems[i].mntPoint = fsnames[i] = fsn;
        if (strncmp(mntdir, MNT_DEV_PREFIX, MNT_DEV_PREFIX_LENGTH)) {
        if (stat(filesystems[i].mntPoint, &sb)) {
            rpmError(RPMERR_STAT, _("failed to stat %s: %s\n"), fsnames[i],
                        strerror(errno));

            freeFilesystems();
            return 1;
        }
        } else
                sb.st_dev = 0;
        
        filesystems[i].dev = sb.st_dev;
        filesystems[i].rdonly = rdonly;

        /* goto the next vmount structure: */
        vm = (struct vmount *)((char *)vm + vm->vmt_length);
    }

    filesystems[i].mntPoint = NULL;
    fsnames[i]              = NULL;

    return 0;
}

#else   /* HAVE_MNTCTL */

static int getFilesystemList(void)
        /*@globals fileSystem, internalState@*/
        /*@modifies fileSystem, internalState@*/
{
    int numAlloced = 10;
    struct stat sb;
    int i;
    const char * mntdir;
    int rdonly = 0;

#   if GETMNTENT_ONE || GETMNTENT_TWO
    our_mntent item;
    FILE * mtab;

        mtab = fopen(MOUNTED, "r");
        if (!mtab) {
            rpmError(RPMERR_MTAB, _("failed to open %s: %s\n"), MOUNTED, 
                     strerror(errno));
            return 1;
        }
#   elif HAVE_GETMNTINFO_R
    struct statfs * mounts = NULL;
    int mntCount = 0, bufSize = 0, flags = MNT_NOWAIT;
    int nextMount = 0;

        getmntinfo_r(&mounts, flags, &mntCount, &bufSize);
#   endif

    filesystems = xcalloc((numAlloced + 1), sizeof(*filesystems));      /* XXX memory leak */

    numFilesystems = 0;
    while (1) {
#       if GETMNTENT_ONE
            /* this is Linux */
            /*@-modunconnomods -moduncon @*/
            our_mntent * itemptr = getmntent(mtab);
            if (!itemptr) break;
            item = *itemptr;    /* structure assignment */
            mntdir = item.our_mntdir;
#if defined(MNTOPT_RO)
            /*@-compdef@*/
            if (hasmntopt(itemptr, MNTOPT_RO) != NULL)
                rdonly = 1;
            /*@=compdef@*/
#endif
            /*@=modunconnomods =moduncon @*/
#       elif GETMNTENT_TWO
            /* Solaris, maybe others */
            if (getmntent(mtab, &item)) break;
            mntdir = item.our_mntdir;
#       elif HAVE_GETMNTINFO_R
            if (nextMount == mntCount) break;
            mntdir = mounts[nextMount++].f_mntonname;
#       endif

#ifdef   our_mnttype
        if ( item.our_mnttype && *item.our_mnttype && !strcmp( "supermount", item.our_mnttype ) )
                continue;
#endif

        if (stat(mntdir, &sb)) {
            rpmError(RPMERR_STAT, _("failed to stat %s: %s\n"), mntdir,
                        strerror(errno));

            freeFilesystems();
            return 1;
        }

        numFilesystems++;
        if ((numFilesystems + 1) == numAlloced) {
            numAlloced += 10;
            filesystems = xrealloc(filesystems, 
                                  sizeof(*filesystems) * (numAlloced + 1));
        }

        filesystems[numFilesystems-1].dev = sb.st_dev;
        filesystems[numFilesystems-1].mntPoint = xstrdup(mntdir);
        filesystems[numFilesystems-1].rdonly = rdonly;
    }

#   if GETMNTENT_ONE || GETMNTENT_TWO
        (void) fclose(mtab);
#   elif HAVE_GETMNTINFO_R
        mounts = _free(mounts);
#   endif

    filesystems[numFilesystems].dev = 0;
    filesystems[numFilesystems].mntPoint = NULL;
    filesystems[numFilesystems].rdonly = 0;

    fsnames = xcalloc((numFilesystems + 1), sizeof(*fsnames));
    for (i = 0; i < numFilesystems; i++)
        fsnames[i] = filesystems[i].mntPoint;
    fsnames[numFilesystems] = NULL;

    return 0; 
}
#endif  /* HAVE_MNTCTL */

int rpmGetFilesystemList(const char *** listptr, int * num)
{
    if (!fsnames) 
        if (getFilesystemList())
            return 1;

    if (listptr) *listptr = fsnames;
    if (num) *num = numFilesystems;

    return 0;
}

int rpmGetFilesystemUsage(const char ** fileList, int_32 * fssizes, int numFiles,
                          uint_32 ** usagesPtr, /*@unused@*/ int flags)
{
    int_32 * usages;
    int i, len, j;
    char * buf, * dirName;
    char * chptr;
    int maxLen;
    char * lastDir;
    const char * sourceDir;
    int lastfs = 0;
    int lastDev = -1;           /* I hope nobody uses -1 for a st_dev */
    struct stat sb;

    if (!fsnames) 
        if (getFilesystemList())
            return 1;

    usages = xcalloc(numFilesystems, sizeof(usages));

    sourceDir = rpmGetPath("%{_sourcedir}", NULL);

    maxLen = strlen(sourceDir);
    for (i = 0; i < numFiles; i++) {
        len = strlen(fileList[i]);
        if (maxLen < len) maxLen = len;
    }
    
    buf = alloca(maxLen + 1);
    lastDir = alloca(maxLen + 1);
    dirName = alloca(maxLen + 1);
    *lastDir = '\0';

    /* cut off last filename */
    for (i = 0; i < numFiles; i++) {
        if (*fileList[i] == '/') {
            strcpy(buf, fileList[i]);
            chptr = buf + strlen(buf) - 1;
            while (*chptr != '/') chptr--;
            if (chptr == buf)
                buf[1] = '\0';
            else
                *chptr-- = '\0';
        } else {
            /* this should only happen for source packages (gulp) */
            strcpy(buf,  sourceDir);
        }

        if (strcmp(lastDir, buf)) {
            strcpy(dirName, buf);
            chptr = dirName + strlen(dirName) - 1;
            while (stat(dirName, &sb)) {
                if (errno != ENOENT) {
                    rpmError(RPMERR_STAT, _("failed to stat %s: %s\n"), buf,
                                strerror(errno));
                    sourceDir = _free(sourceDir);
                    usages = _free(usages);
                    return 1;
                }

                /* cut off last directory part, because it was not found. */
                while (*chptr != '/') chptr--;

                if (chptr == dirName)
                    dirName[1] = '\0';
                else
                    *chptr-- = '\0';
            }

            if (lastDev != sb.st_dev) {
                for (j = 0; j < numFilesystems; j++)
                    if (filesystems && filesystems[j].dev == sb.st_dev)
                        /*@innerbreak@*/ break;

                if (j == numFilesystems) {
                    rpmError(RPMERR_BADDEV, 
                                _("file %s is on an unknown device\n"), buf);
                    sourceDir = _free(sourceDir);
                    usages = _free(usages);
                    return 1;
                }

                lastfs = j;
                lastDev = sb.st_dev;
            }
        }

        strcpy(lastDir, buf);
        usages[lastfs] += fssizes[i];
    }

    sourceDir = _free(sourceDir);

    /*@-branchstate@*/
    if (usagesPtr)
        *usagesPtr = usages;
    else
        usages = _free(usages);
    /*@=branchstate@*/

    return 0;
}
/*@=usereleased =onlytrans@*/
/*@=mods@*/

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