X-Git-Url: http://git.ozlabs.org/?p=petitboot;a=blobdiff_plain;f=discover%2Fpaths.c;h=d95e359e9f170b6a69e925a9002bdbe512818ec3;hp=fe7a87635fe7384642cb0400d2c4d4497032358a;hb=9974f2d82b9450eaccd7661b3bfabb686ab8e161;hpb=965e71e54686b0987409276933c085f794bf21f6

diff --git a/discover/paths.c b/discover/paths.c
index fe7a876..d95e359 100644
--- a/discover/paths.c
+++ b/discover/paths.c
@@ -5,151 +5,303 @@
 #include <stdlib.h>
 
 #include <talloc/talloc.h>
+#include <system/system.h>
+#include <url/url.h>
+#include <log/log.h>
 
 #include "paths.h"
 
 #define DEVICE_MOUNT_BASE (LOCAL_STATE_DIR "/petitboot/mnt")
 
-struct mount_map {
-	char *dev, *mnt;
-};
-
-static struct mount_map *mount_map;
-static int mount_map_size;
-
-static int is_prefix(const char *str, const char *prefix)
+const char *mount_base(void)
 {
-	return !strncmp(str, prefix, strlen(prefix));
+	return DEVICE_MOUNT_BASE;
 }
 
-static int is_prefix_ignorecase(const char *str, const char *prefix)
+char *join_paths(void *alloc_ctx, const char *a, const char *b)
 {
-	return !strncasecmp(str, prefix, strlen(prefix));
+	char *full_path;
+
+	full_path = talloc_array(alloc_ctx, char, strlen(a) + strlen(b) + 2);
+
+	strcpy(full_path, a);
+	if (b[0] != '/' && a[strlen(a) - 1] != '/')
+		strcat(full_path, "/");
+	strcat(full_path, b);
+
+	return full_path;
 }
 
-const char *mount_base(void)
+
+static char *local_name(void *ctx)
 {
-	return DEVICE_MOUNT_BASE;
+	char *tmp, *ret;
+
+	tmp = tempnam(NULL, "pb-");
+
+	if (!tmp)
+		return NULL;
+
+	ret = talloc_strdup(ctx, tmp);
+	free(tmp);
+
+	return ret;
 }
 
-char *encode_label(void *alloc_ctx, const char *label)
+/**
+ * pb_load_nfs - Mounts the NFS export and returns the local file path.
+ *
+ * Returns the local file path in a talloc'ed character string on success,
+ * or NULL on error.
+ */
+static char *load_nfs(void *ctx, struct pb_url *url)
 {
-	char *str, *c;
-	unsigned int i;
+	int result;
+	const char *argv[8];
+	const char **p;
+	char *local;
+	char *opts;
 
-	/* the label can be expanded by up to four times */
-	str = talloc_size(alloc_ctx, strlen(label) * 4 + 1);
-	c = str;
+	local = local_name(ctx);
 
-	for (i = 0; i < strlen(label); i++) {
+	if (!local)
+		return NULL;
 
-		if (label[i] == '/' || label[i] == '\\') {
-			sprintf(c, "\\x%02x", label[i]);
-			c += 4;
-			continue;
-		}
+	result = pb_mkdir_recursive(local);
 
-		*(c++) = label[i];
-	}
+	if (result)
+		goto fail;
 
-	*c = '\0';
+	opts = talloc_strdup(NULL, "ro,nolock,nodiratime");
 
-	return str;
-}
+	if (url->port)
+		opts = talloc_asprintf_append(opts, ",port=%s", url->port);
 
-char *parse_device_path(void *alloc_ctx,
-		const char *dev_str, const char *cur_dev)
-{
-	char *dev, tmp[256], *enc;
+	p = argv;
+	*p++ = pb_system_apps.mount;	/* 1 */
+	*p++ = "-t";			/* 2 */
+	*p++ = "nfs";			/* 3 */
+	*p++ = opts;			/* 4 */
+	*p++ = url->host;		/* 5 */
+	*p++ = url->dir;		/* 6 */
+	*p++ = local;			/* 7 */
+	*p++ = NULL;			/* 8 */
 
-	if (is_prefix_ignorecase(dev_str, "uuid=")) {
-		dev = talloc_asprintf(alloc_ctx, "/dev/disk/by-uuid/%s",
-				dev_str + strlen("uuid="));
-		return dev;
-	}
+	result = pb_run_cmd(argv, 1, 0);
 
-	if (is_prefix_ignorecase(dev_str, "label=")) {
-		enc = encode_label(NULL, dev_str + strlen("label="));
-		dev = talloc_asprintf(alloc_ctx, "/dev/disk/by-label/%s", enc);
-		talloc_free(enc);
-		return dev;
-	}
+	talloc_free(opts);
+
+	if (result)
+		goto fail;
+
+	local = talloc_asprintf_append(local,  "/%s", url->path);
+	pb_log("%s: local '%s'\n", __func__, local);
 
-	/* normalise '/dev/foo' to 'foo' for easy comparisons, we'll expand
-	 * back before returning.
-	 */
-	if (is_prefix(dev_str, "/dev/"))
-		dev_str += strlen("/dev/");
+	return local;
 
-	return join_paths(alloc_ctx, "/dev", dev_str);
+fail:
+	pb_rmdir_recursive("/", local);
+	talloc_free(local);
+	return NULL;
 }
 
-const char *mountpoint_for_device(const char *dev)
+/**
+ * pb_load_sftp - Loads a remote file via sftp and returns the local file path.
+ *
+ * Returns the local file path in a talloc'ed character string on success,
+ * or NULL on error.
+ */
+static char *load_sftp(void *ctx, struct pb_url *url)
 {
-	int i;
+	int result;
+	const char *argv[4];
+	const char **p;
+	char *local;
 
-	if (is_prefix(dev, "/dev/"))
-		dev += strlen("/dev/");
+	local = local_name(ctx);
 
-	/* check existing entries in the map */
-	for (i = 0; i < mount_map_size; i++)
-		if (!strcmp(mount_map[i].dev, dev))
-			return mount_map[i].mnt;
+	if (!local)
+		return NULL;
 
-	/* no existing entry, create a new one */
-	i = mount_map_size++;
-	mount_map = talloc_realloc(NULL, mount_map,
-			struct mount_map, mount_map_size);
+	p = argv;
+	*p++ = pb_system_apps.sftp;					/* 1 */
+	*p++ = talloc_asprintf(local, "%s:%s", url->host, url->path);	/* 2 */
+	*p++ = local;							/* 3 */
+	*p++ = NULL;							/* 4 */
 
-	mount_map[i].dev = talloc_strdup(mount_map, dev);
-	mount_map[i].mnt = join_paths(mount_map, DEVICE_MOUNT_BASE, dev);
-	return mount_map[i].mnt;
-}
+	result = pb_run_cmd(argv, 1, 0);
 
-char *resolve_path(void *alloc_ctx, const char *path, const char *current_dev)
-{
-	static const char s_file[] = "file://";
-	char *ret;
-	const char *devpath, *sep;
-
-	/* test for urls */
-
-	if (!strncasecmp(path, s_file, sizeof(s_file) - 1))
-		path += sizeof(s_file) - 1;
-	else if (strstr(path, "://"))
-		return talloc_strdup(alloc_ctx, path);
-
-	sep = strchr(path, ':');
-	if (!sep) {
-		devpath = mountpoint_for_device(current_dev);
-		ret = join_paths(alloc_ctx, devpath, path);
-	} else {
-		/* parse just the device name into dev */
-		char *tmp, *dev;
-		tmp = talloc_strndup(NULL, path, sep - path);
-		dev = parse_device_path(NULL, tmp, current_dev);
-
-		devpath = mountpoint_for_device(dev);
-		ret = join_paths(alloc_ctx, devpath, sep + 1);
-
-		talloc_free(dev);
-		talloc_free(tmp);
-	}
+	if (result)
+		goto fail;
 
-	return ret;
+	return local;
+
+fail:
+	talloc_free(local);
+	return NULL;
 }
 
-char *join_paths(void *alloc_ctx, const char *a, const char *b)
+/**
+ * pb_load_tftp - Loads a remote file via tftp and returns the local file path.
+ *
+ * Returns the local file path in a talloc'ed character string on success,
+ * or NULL on error.
+ */
+
+static char *load_tftp(void *ctx, struct pb_url *url)
 {
-	char *full_path;
+	int result;
+	const char *argv[10];
+	const char **p;
+	char *local;
+
+	local = local_name(ctx);
+
+	if (!local)
+		return NULL;
+
+	/* first try busybox tftp args */
+
+	p = argv;
+	*p++ = pb_system_apps.tftp;	/* 1 */
+	*p++ = "-g";			/* 2 */
+	*p++ = "-l";			/* 3 */
+	*p++ = local;			/* 4 */
+	*p++ = "-r";			/* 5 */
+	*p++ = url->path;		/* 6 */
+	*p++ = url->host;		/* 7 */
+	if (url->port)
+		*p++ = url->port;	/* 8 */
+	*p++ = NULL;			/* 9 */
+
+	result = pb_run_cmd(argv, 1, 0);
+
+	if (!result)
+		return local;
+
+	/* next try tftp-hpa args */
+
+	p = argv;
+	*p++ = pb_system_apps.tftp;	/* 1 */
+	*p++ = "-m";			/* 2 */
+	*p++ = "binary";		/* 3 */
+	*p++ = url->host;		/* 4 */
+	if (url->port)
+		*p++ = url->port;	/* 5 */
+	*p++ = "-c";			/* 6 */
+	*p++ = "get";			/* 7 */
+	*p++ = url->path;		/* 8 */
+	*p++ = local;			/* 9 */
+	*p++ = NULL;			/* 10 */
+
+	result = pb_run_cmd(argv, 1, 0);
+
+	if (!result)
+		return local;
+
+	talloc_free(local);
+	return NULL;
+}
 
-	full_path = talloc_array(alloc_ctx, char, strlen(a) + strlen(b) + 2);
+enum wget_flags {
+	wget_empty = 0,
+	wget_no_check_certificate = 1,
+};
 
-	strcpy(full_path, a);
-	if (b[0] != '/' && a[strlen(a) - 1] != '/')
-		strcat(full_path, "/");
-	strcat(full_path, b);
+/**
+ * pb_load_wget - Loads a remote file via wget and returns the local file path.
+ *
+ * Returns the local file path in a talloc'ed character string on success,
+ * or NULL on error.
+ */
 
-	return full_path;
+static char *load_wget(void *ctx, struct pb_url *url, enum wget_flags flags)
+{
+	int result;
+	const char *argv[7];
+	const char **p;
+	char *local;
+
+	local = local_name(ctx);
+
+	if (!local)
+		return NULL;
+
+	p = argv;
+	*p++ = pb_system_apps.wget;			/* 1 */
+#if !defined(DEBUG)
+	*p++ = "--quiet";				/* 2 */
+#endif
+	*p++ = "-O";					/* 3 */
+	*p++ = local;					/* 4 */
+	*p++ = url->full;				/* 5 */
+	if (flags & wget_no_check_certificate)
+		*p++ = "--no-check-certificate";	/* 6 */
+	*p++ = NULL;					/* 7 */
+
+	result = pb_run_cmd(argv, 1, 0);
+
+	if (result)
+		goto fail;
+
+	return local;
+
+fail:
+	talloc_free(local);
+	return NULL;
 }
 
+/**
+ * load_url - Loads a (possibly) remote URL and returns the local file
+ * path.
+ * @ctx: The talloc context to associate with the returned string.
+ * @URL: The remote file URL.
+ * @tempfile: An optional variable pointer to be set when a temporary local
+ *  file is created.
+ *
+ * Returns the local file path in a talloc'ed character string on success,
+ * or NULL on error.
+ */
+
+char *load_url(void *ctx, struct pb_url *url, unsigned int *tempfile)
+{
+	char *local;
+	int tmp = 0;
+
+	if (!url)
+		return NULL;
+
+	switch (url->scheme) {
+	case pb_url_ftp:
+	case pb_url_http:
+		local = load_wget(ctx, url, 0);
+		tmp = !!local;
+		break;
+	case pb_url_https:
+		local = load_wget(ctx, url, wget_no_check_certificate);
+		tmp = !!local;
+		break;
+	case pb_url_nfs:
+		local = load_nfs(ctx, url);
+		tmp = !!local;
+		break;
+	case pb_url_sftp:
+		local = load_sftp(ctx, url);
+		tmp = !!local;
+		break;
+	case pb_url_tftp:
+		local = load_tftp(ctx, url);
+		tmp = !!local;
+		break;
+	default:
+		local = talloc_strdup(ctx, url->full);
+		tmp = 0;
+		break;
+	}
+
+	if (tempfile)
+		*tempfile = tmp;
+
+	talloc_free(url);
+	return local;
+}