[Rpm-maint] [rpm-software-management/rpm] How to change a header value of something in the base and in the package file itself? (#478)

[Victor Polevoy]

@n3npq Could you help me please?

```c
static int readPackage(const char *packageFileName)
{
    int ret = 0;

    const FD_t fd = Fopen(packageFileName, "r+.ufdio");
    if (fd == NULL || Ferror(fd)) {
        fprintf(stderr, _("%s: open failed: %s\n"), packageFileName, Fstrerror(fd));
        ret = 1;
        goto exit;
    }

    /* Read rpm lead */
    char *msg = NULL;
    if (rpmLeadRead(fd, NULL, &msg) != RPMRC_OK) {
        fprintf(stderr, _("Unable to read rpm lead from %s: %s\n"), packageFileName, msg);
        ret = 2;
        goto exit;
    }

    struct hdrblob_s sigblob;
    if (hdrblobRead(fd, 1, 0, RPMTAG_HEADERSIGNATURES, &sigblob, &msg)) {
        fprintf(stderr, _("Could not read signature header from %s: %s\n"), packageFileName, msg);
        ret = 3;
        goto exit;
    }

    struct hdrblob_s blob;
    if (hdrblobRead(fd, 1, 1, RPMTAG_HEADERIMMUTABLE, &blob, &msg)) {
        fprintf(stderr, _("Could not read header from %s: %s\n"), packageFileName, msg);
        ret = 5;
        goto exit;
    }

    Header sigh = NULL;
    if (hdrblobImport(&sigblob, 0, &sigh, &msg)) {
        fprintf(stderr, _("Could not parse signature header from %s: %s\n"), packageFileName, msg);
        ret = 4;
		goto exit;
    }


    Header h = NULL;
    if (hdrblobImport(&blob, 0, &h, &msg)) {
        fprintf(stderr, _("Could not parse header from %s: %s\n"), packageFileName, msg);
        ret = 6;
		goto exit;
    }

    if (!sigh || !h) {
        fprintf(stderr, "PARASHA");
        ret = 7;
        goto exit;
    }
    // whenever I try to read any header value I receive (none) or (null) here, but pointers are not null (the check above ensure they are not)
}
```

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