unify common parts of extlinux and syslinux installer

Thus we can share same command line options and reduce a lot of dup
code...

Seems like a big patch, but the changes are quite safe, no much logical
change.

Signed-off-by: Alek Du <alek.du@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 171 insertions, 0 deletions

diff --git a/libinstaller/syslxopt.c b/libinstaller/syslxopt.c
new file mode 100644
index 00000000..7718de3a
--- /dev/null
+++ b/libinstaller/syslxopt.c
@@ -0,0 +1,171 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 2010 Intel Corp. - 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, Inc., 53 Temple Place Ste 330,
+ *   Boston MA 02111-1307, USA; either version 2 of the License, or
+ *   (at your option) any later version; incorporated herein by reference.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * syslxopt.c
+ *
+ * parse cmdline for extlinux and syslinux installer
+ *
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <getopt.h>
+#include <sysexits.h>
+#include "../version.h"
+#include "syslxcom.h"
+#include "syslxopt.h"
+
+/* These are the options we can set their values */
+struct sys_options opt = {
+    .sectors = 0,
+    .heads = 0,
+    .raid_mode = 0,
+    .stupid_mode = 0,
+    .reset_adv = 0,
+    .set_once = NULL,
+    .update_only = -1,
+    .directory = NULL,
+    .device = NULL,
+    .offset = 0,
+};
+
+const struct option long_options[] = {
+    {"install", 0, NULL, 'i'},
+    {"directory", 1, NULL, 'd'},
+    {"offset", 1, NULL, 'f'},
+    {"update", 0, NULL, 'U'},
+    {"zipdrive", 0, NULL, 'z'},
+    {"sectors", 1, NULL, 'S'},
+    {"stupid", 0, NULL, 's'},
+    {"heads", 1, NULL, 'H'},
+    {"raid-mode", 0, NULL, 'r'},
+    {"version", 0, NULL, 'v'},
+    {"help", 0, NULL, 'h'},
+    {"once", 1, NULL, 'o'},
+    {"clear-once", 0, NULL, 'O'},
+    {"reset-adv", 0, NULL, OPT_RESET_ADV},
+    {0, 0, 0, 0}
+};
+
+const char short_options[] = "id:f:UuzS:H:rvho:O";
+
+void __attribute__ ((noreturn)) usage(int rv, int mode)
+{
+    if (mode) /* for unmounted fs installation */
+	fprintf(stderr,
+	    "Usage: %s [options] device\n"
+	    "  --offset     -f Offset of the file system on the device \n"
+	    "  --directory  -d  Directory for installation target\n",
+	    program);
+    else /* actually extlinux can also use -d to provide directory too */
+	fprintf(stderr,
+	    "Usage: %s [options] directory\n",
+	    program);
+    fprintf(stderr,
+	    "  --install    -i  Install over the current bootsector\n"
+	    "  --update     -U  Update a previous EXTLINUX installation\n"
+	    "  --zip        -z  Force zipdrive geometry (-H 64 -S 32)\n"
+	    "  --sectors=#  -S  Force the number of sectors per track\n"
+	    "  --heads=#    -H  Force number of heads\n"
+	    "  --stupid     -s  Slow, safe and stupid mode\n"
+	    "  --raid       -r  Fall back to the next device on boot failure\n"
+	    "  --once=...   -o  Execute a command once upon boot\n"
+	    "  --clear-once -O  Clear the boot-once command\n"
+	    "  --reset-adv      Reset auxilliary data\n"
+	    "\n"
+	    "  Note: geometry is determined at boot time for devices which\n"
+	    "  are considered hard disks by the BIOS.  Unfortunately, this is\n"
+	    "  not possible for devices which are considered floppy disks,\n"
+	    "  which includes zipdisks and LS-120 superfloppies.\n"
+	    "\n"
+	    "  The -z option is useful for USB devices which are considered\n"
+	    "  hard disks by some BIOSes and zipdrives by other BIOSes.\n"
+	    );
+
+    exit(rv);
+}
+
+void parse_options(int argc, char *argv[], int mode)
+{
+    int o;
+
+    program = argv[0];
+    while ((o = getopt_long(argc, argv, short_options,
+			    long_options, NULL)) != EOF) {
+	switch (o) {
+	case 'z':
+	    opt.heads = 64;
+	    opt.sectors = 32;
+	    break;
+	case 'S':
+	    opt.sectors = strtoul(optarg, NULL, 0);
+	    if (opt.sectors < 1 || opt.sectors > 63) {
+		fprintf(stderr,
+			"%s: invalid number of sectors: %u (must be 1-63)\n",
+			program, opt.sectors);
+		exit(EX_USAGE);
+	    }
+	    break;
+	case 'H':
+	    opt.heads = strtoul(optarg, NULL, 0);
+	    if (opt.heads < 1 || opt.heads > 256) {
+		fprintf(stderr,
+			"%s: invalid number of heads: %u (must be 1-256)\n",
+			program, opt.heads);
+		exit(EX_USAGE);
+	    }
+	    break;
+	case 'r':
+	    opt.raid_mode = 1;
+	    break;
+	case 's':
+	    opt.stupid_mode = 1;
+	    break;
+	case 'i':
+	    opt.update_only = 0;
+	    break;
+	case 'u':
+	case 'U':
+	    opt.update_only = 1;
+	    break;
+	case 'h':
+	    usage(0, mode);
+	    break;
+	case 'o':
+	    opt.set_once = optarg;
+	    break;
+	case 'f':
+	    opt.offset = strtoul(optarg, NULL, 0);
+	case 'O':
+	    opt.set_once = "";
+	    break;
+	case 'd':
+	    opt.directory = optarg;
+	case OPT_RESET_ADV:
+	    opt.reset_adv = 1;
+	    break;
+	case 'v':
+	    fputs(program, stderr);
+	    fputs(" " VERSION_STR
+		  "  Copyright 1994-" YEAR_STR " H. Peter Anvin \n", stderr);
+	    exit(0);
+	default:
+	    usage(EX_USAGE, mode);
+	}
+    }
+    if (mode)
+	opt.device = argv[optind];
+    else if (!opt.directory)
+	opt.directory = argv[optind];
+}