rpm2cpio.c

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/* rpmarchive: spit out the main archive portion of a package */

#include "system.h"
const char *__progname;

#include <rpm/rpmlib.h>         /* rpmReadPackageFile .. */
#include <rpm/rpmtag.h>
#include <rpm/rpmio.h>
#include <rpm/rpmpgp.h>

#include <rpm/rpmts.h>

#include "debug.h"

int main(int argc, char *argv[])
{
    FD_t fdi, fdo;
    Header h;
    char * rpmio_flags = NULL;
    int rc;
    off_t payload_size;
    FD_t gzdi;
    
    setprogname(argv[0]);       /* Retrofit glibc __progname */
    rpmReadConfigFiles(NULL, NULL);
    if (argc == 1)
        fdi = fdDup(STDIN_FILENO);
    else {
        if (rstreq(argv[1], "-h") || rstreq(argv[1], "--help")) {
            fprintf(stderr, "Usage: rpm2cpio file.rpm\n");
            exit(EXIT_FAILURE);
        }
        fdi = Fopen(argv[1], "r.ufdio");
    }

    if (Ferror(fdi)) {
        fprintf(stderr, "%s: %s: %s\n", argv[0],
                (argc == 1 ? "<stdin>" : argv[1]), Fstrerror(fdi));
        exit(EXIT_FAILURE);
    }
    fdo = fdDup(STDOUT_FILENO);

    {   rpmts ts = rpmtsCreate();
        rpmVSFlags vsflags = 0;

        /* XXX retain the ageless behavior of rpm2cpio */
        vsflags |= _RPMVSF_NODIGESTS;
        vsflags |= _RPMVSF_NOSIGNATURES;
        vsflags |= RPMVSF_NOHDRCHK;
        (void) rpmtsSetVSFlags(ts, vsflags);

        rc = rpmReadPackageFile(ts, fdi, "rpm2cpio", &h);

        ts = rpmtsFree(ts);
    }

    switch (rc) {
    case RPMRC_OK:
    case RPMRC_NOKEY:
    case RPMRC_NOTTRUSTED:
        break;
    case RPMRC_NOTFOUND:
        fprintf(stderr, _("argument is not an RPM package\n"));
        exit(EXIT_FAILURE);
        break;
    case RPMRC_FAIL:
    default:
        fprintf(stderr, _("error reading header from package\n"));
        exit(EXIT_FAILURE);
        break;
    }

    /* Retrieve payload size and compression type. */
    {   const char *compr = headerGetString(h, RPMTAG_PAYLOADCOMPRESSOR);
        rpmio_flags = rstrscat(NULL, "r.", compr ? compr : "gzip", NULL);
        payload_size = headerGetNumber(h, RPMTAG_LONGARCHIVESIZE);
    }

    gzdi = Fdopen(fdi, rpmio_flags);    /* XXX gzdi == fdi */
    free(rpmio_flags);

    if (gzdi == NULL) {
        fprintf(stderr, _("cannot re-open payload: %s\n"), Fstrerror(gzdi));
        exit(EXIT_FAILURE);
    }

    /*
     * XXX HACK for #1142949: should be equality test, but archive size
     * short by cpio trailer size in packages built with rpm 4.12.0
     * and its pre-releases.
     */
    rc = (ufdCopy(gzdi, fdo) >= payload_size) ? EXIT_SUCCESS : EXIT_FAILURE;

    Fclose(fdo);

    Fclose(gzdi);       /* XXX gzdi == fdi */

    return rc;
}