xbps-uhelper: restore compat.

Add 'digest' and 'fetch' actions again for compatibility,
but don't mention them in usage().

This way previous versions of xbps-src (that don't require xbps-0.54)
still work without changes.

bin/xbps-uhelper/Makefile

@@ -2,7 +2,7 @@ TOPDIR = ../..
 -include $(TOPDIR)/config.mk
 
 BIN = xbps-uhelper
-OBJS = main.o
+OBJS = main.o ../xbps-install/fetch_cb.o
 MAN =
 
 include $(TOPDIR)/mk/prog.mk

bin/xbps-uhelper/main.c

@@ -35,6 +35,7 @@
 #include <getopt.h>
 
 #include <xbps.h>
+#include "../xbps-install/defs.h"
 
 static void __attribute__((noreturn))
 usage(void)
@@ -79,13 +80,29 @@ usage(void)
 	exit(EXIT_FAILURE);
 }
 
+static char *
+fname(char *url)
+{
+	char *filename;
+
+	if ((filename = strrchr(url, '>'))) {
+		*filename = '\0';
+	} else {
+		filename = strrchr(url, '/');
+	}
+	if (filename == NULL)
+		return NULL;
+	return filename + 1;
+}
+
 int
 main(int argc, char **argv)
 {
 	xbps_dictionary_t dict;
 	struct xbps_handle xh;
+	struct xferstat xfer;
 	const char *version, *rootdir = NULL, *confdir = NULL;
-	char *pkgname;
+	char *pkgname, *filename;
 	int flags = 0, c, rv = 0;
 	const struct option longopts[] = {
 		{ NULL, 0, NULL, 0 }
@@ -123,10 +140,13 @@ main(int argc, char **argv)
 	if ((strcmp(argv[0], "version") == 0) ||
 	    (strcmp(argv[0], "real-version") == 0) ||
 	    (strcmp(argv[0], "arch") == 0) ||
+	    (strcmp(argv[0], "fetch") == 0) ||
 	    (strcmp(argv[0], "getsystemdir") == 0)) {
 		/*
 		* Initialize libxbps.
 		*/
+		xh.fetch_cb = fetch_file_progress_cb;
+		xh.fetch_cb_data = &xfer;
 		xh.flags = flags;
 		if (rootdir)
 			xbps_strlcpy(xh.rootdir, rootdir, sizeof(xh.rootdir));
@@ -268,6 +288,39 @@ main(int argc, char **argv)
 			usage();
 
 		printf("%s\n", XBPS_SYSDEFCONF_PATH);
+	} else if (strcmp(argv[0], "digest") == 0) {
+		/* Prints SHA256 hashes for specified files */
+		if (argc < 2)
+			usage();
+
+		for (int i = 1; i < argc; i++) {
+			filename = xbps_file_hash(argv[i]);
+			if (filename == NULL) {
+				fprintf(stderr,
+				    "E: couldn't get hash for %s (%s)\n",
+				    argv[i], strerror(errno));
+				exit(EXIT_FAILURE);
+			}
+			printf("%s\n", filename);
+		}
+	} else if (strcmp(argv[0], "fetch") == 0) {
+		/* Fetch a file from specified URL */
+		if (argc < 2)
+			usage();
+
+		for (int i = 1; i < argc; i++) {
+			filename = fname(argv[i]);
+			rv = xbps_fetch_file_dest(&xh, argv[i], filename, "v");
+
+			if (rv == -1) {
+				fprintf(stderr, "%s: %s\n", argv[i],
+				    xbps_fetch_error_string());
+			} else if (rv == 0) {
+				printf("%s: file is identical with remote.\n", argv[i]);
+			} else {
+				rv = 0;
+			}
+		}
 	} else {
 		usage();
 	}