Add noextract configuration option

Closes #208
Fixes #165

lib/conf.c

@@ -145,6 +145,19 @@ store_ignored_pkg(struct xbps_handle *xhp, const char *pkgname)
 	xbps_dbg_printf(xhp, "Added ignored package: %s\n", pkgname);
 }
 
+static void
+store_noextract(struct xbps_handle *xhp, const char *value)
+{
+	if (*value == '\0')
+		return;
+	if (xhp->noextract == NULL) {
+		xhp->noextract = xbps_array_create();
+		assert(xhp->noextract);
+	}
+	xbps_array_add_cstring(xhp->noextract, value);
+	xbps_dbg_printf(xhp, "Added noextract pattern: %s\n", value);
+}
+
 enum {
 	KEY_ERROR = 0,
 	KEY_ARCHITECTURE,
@@ -152,6 +165,7 @@ enum {
 	KEY_CACHEDIR,
 	KEY_IGNOREPKG,
 	KEY_INCLUDE,
+	KEY_NOEXTRACT,
 	KEY_PRESERVE,
 	KEY_REPOSITORY,
 	KEY_ROOTDIR,
@@ -169,6 +183,7 @@ static const struct key {
 	{ "cachedir",      8, KEY_CACHEDIR },
 	{ "ignorepkg",     9, KEY_IGNOREPKG },
 	{ "include",       7, KEY_INCLUDE },
+	{ "noextract",     9, KEY_NOEXTRACT },
 	{ "preserve",      8, KEY_PRESERVE },
 	{ "repository",   10, KEY_REPOSITORY },
 	{ "rootdir",       7, KEY_ROOTDIR },
@@ -353,6 +368,9 @@ parse_file(struct xbps_handle *xhp, const char *path, bool nested)
 		case KEY_IGNOREPKG:
 			store_ignored_pkg(xhp, val);
 			break;
+		case KEY_NOEXTRACT:
+			store_noextract(xhp, val);
+			break;
 		case KEY_INCLUDE:
 			/* Avoid double-nested parsing, only allow it once */
 			if (nested) {

lib/package_unpack.c

@@ -305,6 +305,15 @@ unpack_archive(struct xbps_handle *xhp,
 				xucd_stats = true;
 			}
 		}
+		/*
+		 * Skip files that match noextract patterns from configuration file.
+		 */
+		if (xhp->noextract && xbps_patterns_match(xhp->noextract, entry_pname+1)) {
+			xbps_set_cb_state(xhp, XBPS_STATE_UNPACK_FILE_PRESERVED, 0,
+			    pkgver, "%s: file `%s' won't be extracted, "
+			    "it matches a noextract pattern.", pkgver, entry_pname);
+			continue;
+		}
 		/*
 		 * Always check that extracted file exists and hash
 		 * doesn't match, in that case overwrite the file.
@@ -323,7 +332,7 @@ unpack_archive(struct xbps_handle *xhp,
 			    "and must be preserved, skipping.\n", entry_pname);
 			xbps_set_cb_state(xhp, XBPS_STATE_UNPACK_FILE_PRESERVED, 0,
 			    pkgver, "%s: file `%s' won't be extracted, "
-			    "it's preserved.\n", pkgver, entry_pname);
+			    "it's preserved.", pkgver, entry_pname);
 			continue;
 		}
 

lib/util.c

@@ -648,3 +648,27 @@ xbps_symlink_target(struct xbps_handle *xhp, const char *path, const char *tgt)
 
 	return res;
 }
+
+bool
+xbps_patterns_match(xbps_array_t patterns, const char *path)
+{
+	bool match = false;
+
+	if (patterns == NULL)
+		return false;
+
+	for (unsigned int i = 0; i < xbps_array_count(patterns); i++) {
+		const char *pattern = NULL;
+		bool negate = false;
+		if (!xbps_array_get_cstring_nocopy(patterns, i, &pattern))
+			continue;
+		if (pattern == NULL)
+			continue;
+		if ((negate = *pattern == '!') || *pattern == '\\')
+			pattern++;
+		if (fnmatch(pattern, path, 0) == 0)
+			match = !negate;
+	}
+
+	return match;
+}