--- /dev/null
+/*
+ * Copyright (c) 2005 Zmanda Inc. All Rights Reserved.
+ *
+ * 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.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Contact information: Zmanda Inc, 505 N Mathlida Ave, Suite 120
+ * Sunnyvale, CA 94085, USA, or: http://www.zmanda.com
+ */
+
+/*
+ * $Id: taperscan.c,v 1.9 2006/03/10 14:29:22 martinea Exp $
+ *
+ * This contains the implementation of the taper-scan algorithm, as it is
+ * used by taper, amcheck, and amtape. See the header file taperscan.h for
+ * interface information. */
+
+#include <amanda.h>
+#include <tapeio.h>
+#include <conffile.h>
+#include "changer.h"
+#include "tapefile.h"
+
+int scan_read_label P((char *dev, char *wantlabel,
+ char** label, char** timestamp,
+ char**error_message));
+int changer_taper_scan P((char *wantlabel, char** gotlabel, char**timestamp,
+ char**error_message, char **tapedev));
+char *find_brand_new_tape_label();
+
+/* NO GLOBALS PLEASE! */
+
+/* How does the taper scan algorithm work? Like this:
+ * 1) If there is a barcode reader, and we have a recyclable tape, use the
+ * reader to load the oldest tape.
+ * 2) Otherwise, search through the changer until we find a new tape
+ * or the oldest recyclable tape.
+ * 3) If we couldn't find the oldest recyclable tape or a new tape,
+ * but if in #2 we found *some* recyclable tape, use the oldest one we
+ * found.
+ * 4) At this point, we give up.
+ */
+
+/* This function checks the label of a single tape, which may or may not
+ * have been loaded by the changer. With the addition of char *dev, it has
+ * the same interface as taper_scan.
+ * Return value is the same as taper_scan.
+ */
+int scan_read_label(char *dev, char *desired_label,
+ char** label, char** timestamp, char** error_message) {
+ char *result = NULL;
+ char *errstr = NULL;
+
+ *label = *timestamp = NULL;
+ result = tape_rdlabel(dev, timestamp, label);
+ if (result != NULL) {
+ if (CHECK_NOT_AMANDA_TAPE_MSG(result) &&
+ getconf_seen(CNF_LABEL_NEW_TAPES)) {
+ amfree(result);
+
+ *label = find_brand_new_tape_label();
+ if (*label != NULL) {
+ *timestamp = stralloc("X");
+ vstrextend(error_message,
+ "Found a non-amanda tape, will label it `",
+ *label, "'.\n", NULL);
+ return 3;
+ }
+ vstrextend(error_message,
+ "Found a non-amanda tape, but have no labels left.\n",
+ NULL);
+ return -1;
+ }
+ amfree(*timestamp);
+ amfree(*label);
+ vstrextend(error_message, result, "\n", NULL);
+ amfree(result);
+ return -1;
+ }
+
+ if ((*label == NULL) || (*timestamp == NULL)) {
+ error("Invalid return from tape_rdlabel");
+ }
+
+ vstrextend(error_message, "read label `", *label, "', date `",
+ *timestamp, "'\n", NULL);
+
+ if (desired_label != NULL && strcmp(*label, desired_label) == 0) {
+ /* Got desired label. */
+ return 1;
+ }
+
+ /* Is this actually an acceptable tape? */
+ if (strcmp(*label, FAKE_LABEL) != 0) {
+ char *labelstr;
+ labelstr = getconf_str(CNF_LABELSTR);
+ if(!match(labelstr, *label)) {
+ vstrextend(&errstr, "label ", *label,
+ " doesn\'t match labelstr \"",
+ labelstr, "\"\n", NULL);
+ return -1;
+ } else {
+ tape_t *tp;
+ if (strcmp(*timestamp, "X") == 0) {
+ /* new, labeled tape. */
+ return 1;
+ }
+
+ tp = lookup_tapelabel(*label);
+
+ if(tp == NULL) {
+ vstrextend(&errstr, "label ", *label,
+ " match labelstr but it not listed in the tapelist file.\n",
+ NULL);
+ return -1;
+ } else if(tp != NULL && !reusable_tape(tp)) {
+ vstrextend(&errstr, "cannot overwrite active tape ", *label,
+ "\n", NULL);
+ return -1;
+ }
+ }
+ }
+
+ /* Yay! We got a good tape! */
+ return 2;
+}
+
+/* Interface is the same as taper_scan, with the addition of the tapedev
+ * output. */
+typedef struct {
+ char *wantlabel;
+ char **gotlabel;
+ char **timestamp;
+ char **error_message;
+ char **tapedev;
+ char *first_labelstr_slot;
+ int backwards;
+ int tape_status;
+} changertrack_t;
+
+int scan_slot(void *data, int rc, char *slotstr, char *device) {
+ int label_result;
+ changertrack_t *ct = ((changertrack_t*)data);
+
+ switch (rc) {
+ default:
+ newvstralloc(*(ct->error_message), *(ct->error_message),
+ "fatal changer error ", slotstr, ": ",
+ changer_resultstr, NULL);
+ return 1;
+ case 1:
+ newvstralloc(*(ct->error_message), *(ct->error_message),
+ "changer error ", slotstr, ": ", changer_resultstr, NULL);
+ return 0;
+ case 0:
+ vstrextend(ct->error_message, "slot ", slotstr, ": ", NULL);
+ label_result = scan_read_label(device, ct->wantlabel, ct->gotlabel,
+ ct->timestamp, ct->error_message);
+ if (label_result == 1 || label_result == 3 ||
+ (label_result == 2 && !ct->backwards)) {
+ *(ct->tapedev) = stralloc(device);
+ ct->tape_status = label_result;
+ return 1;
+ } else if (label_result == 2) {
+ if (ct->first_labelstr_slot == NULL)
+ ct->first_labelstr_slot = stralloc(slotstr);
+ return 0;
+ } else {
+ return 0;
+ }
+ }
+ /* NOTREACHED */
+ return 1;
+}
+
+static int
+scan_init(void *data, int rc, int nslots, int backwards, int searchable) {
+ changertrack_t *ct = ((changertrack_t*)data);
+
+ if (rc) {
+ newvstralloc(*(ct->error_message), *(ct->error_message),
+ "could not get changer info: ", changer_resultstr, NULL);
+ }
+
+ ct->backwards = backwards;
+ return 0;
+}
+
+int changer_taper_scan(char* wantlabel,
+ char** gotlabel, char** timestamp,
+ char** error_message, char **tapedev) {
+ changertrack_t local_data = {wantlabel, gotlabel, timestamp,
+ error_message, tapedev, NULL, 0, 0};
+
+ *gotlabel = *timestamp = *tapedev = NULL;
+
+ changer_find(&local_data, scan_init, scan_slot, wantlabel);
+
+ if (*(local_data.tapedev)) {
+ /* We got it, and it's loaded. */
+ return local_data.tape_status;
+ } else if (local_data.first_labelstr_slot) {
+ /* Use plan B. */
+ if (changer_loadslot(local_data.first_labelstr_slot,
+ NULL, tapedev) == 0) {
+ return scan_read_label(*tapedev, NULL, gotlabel, timestamp,
+ error_message);
+ }
+ }
+
+ /* Didn't find a tape. :-( */
+ assert(local_data.tape_status <= 0);
+ return -1;
+}
+
+int taper_scan(char* wantlabel,
+ char** gotlabel, char** timestamp, char** error_message,
+ char** tapedev) {
+
+ *gotlabel = *timestamp = *error_message = NULL;
+ *tapedev = getconf_str(CNF_TAPEDEV);
+
+ if (wantlabel == NULL) {
+ tape_t *tmp;
+ tmp = lookup_last_reusable_tape(0);
+ if (tmp != NULL) {
+ wantlabel = tmp->label;
+ }
+ }
+
+ if (changer_init()) {
+ return changer_taper_scan(wantlabel, gotlabel, timestamp,
+ error_message, tapedev);
+ }
+
+ return scan_read_label(*tapedev, wantlabel,
+ gotlabel, timestamp, error_message);
+}
+
+#define AUTO_LABEL_MAX_LEN 1024
+char* find_brand_new_tape_label() {
+ char *format;
+ char newlabel[AUTO_LABEL_MAX_LEN];
+ char tmpnum[12];
+ char tmpfmt[16];
+ char *auto_pos = NULL;
+ int i, format_len, label_len, auto_len;
+ tape_t *tp;
+
+ if (!getconf_seen(CNF_LABEL_NEW_TAPES)) {
+ return NULL;
+ }
+ format = getconf_str(CNF_LABEL_NEW_TAPES);
+ format_len = strlen(format);
+
+ memset(newlabel, 0, AUTO_LABEL_MAX_LEN);
+ label_len = 0;
+ auto_len = -1; /* Only find the first '%' */
+ while (*format != '\0') {
+ if (label_len + 4 > AUTO_LABEL_MAX_LEN) {
+ fprintf(stderr, "Auto label format is too long!\n");
+ return NULL;
+ }
+
+ if (*format == '\\') {
+ /* Copy the next character. */
+ newlabel[label_len++] = format[1];
+ format += 2;
+ } else if (*format == '%' && auto_len == -1) {
+ /* This is the format specifier. */
+ auto_pos = newlabel + label_len;
+ auto_len = 0;
+ while (*format == '%' && label_len < AUTO_LABEL_MAX_LEN) {
+ newlabel[label_len++] = '%';
+ auto_len ++;
+ format ++;
+ }
+ } else {
+ /* Just copy a character. */
+ newlabel[label_len++] = *(format++);
+ }
+ }
+
+ /* Sometimes we copy the null, sometimes not. */
+ if (newlabel[label_len] != '\0') {
+ newlabel[label_len++] = '\0';
+ }
+
+ if (auto_pos == NULL) {
+ fprintf(stderr, "Auto label template contains no '%%'!\n");
+ return NULL;
+ }
+
+ sprintf(tmpfmt, "%%0%dd", auto_len);
+
+ for (i = 1; i < INT_MAX; i ++) {
+ sprintf(tmpnum, tmpfmt, i);
+ if (strlen(tmpnum) != auto_len) {
+ fprintf(stderr, "All possible auto-labels used.\n");
+ return NULL;
+ }
+
+ strncpy(auto_pos, tmpnum, auto_len);
+
+ tp = lookup_tapelabel(newlabel);
+ if (tp == NULL) {
+ /* Got it. Double-check that this is a labelstr match. */
+ if (!match(getconf_str(CNF_LABELSTR), newlabel)) {
+ fprintf(stderr, "New label %s does not match labelstr %s!\n",
+ newlabel, getconf_str(CNF_LABELSTR));
+ return 0;
+ }
+ return stralloc(newlabel);
+ }
+ }
+
+ /* NOTREACHED. Unless you have over two billion tapes. */
+ fprintf(stderr, "Taper internal error in find_brand_new_tape_label.");
+ return 0;
+}
projects / debian / amanda / blobdiff