pkg: allow filtering files at install time

Add 2 new options: FILES_IGNORE_GLOB and FILES_IGNORE_REGEX which allows
a consumer to filter out some files from installation a installation
time

for example:
$ pkg -o FILES_IGNORE_REGEX=".*man.*\.gz$" \
      -o FILES_IGNORE_GLOB="*/share/doc/*" \
      install package

Will install all the files from "package" but skip documentation and
manpages

libpkg/pkg_add.c

@@ -748,6 +748,11 @@ pkg_extract_finalize(struct pkg *pkg)
 	install_as_user = (getenv("INSTALL_AS_USER") != NULL);
 
 	while (pkg_files(pkg, &f) == EPKG_OK) {
+
+		if (match_ucl_lists(f->path,
+		    pkg_config_get("FILES_IGNORE_GLOB"),
+		    pkg_config_get("FILES_IGNORE_REGEX")))
+			continue;
 		append_touched_file(f->path);
 		if (*f->temppath == '\0')
 			continue;
@@ -1030,6 +1035,10 @@ pkg_rollback_pkg(struct pkg *p)
 	struct pkg_file *f = NULL;
 
 	while (pkg_files(p, &f) == EPKG_OK) {
+		if (match_ucl_lists(f->path,
+		    pkg_config_get("FILES_IGNORE_GLOB"),
+		    pkg_config_get("FILES_IGNORE_REGEX")))
+			continue;
 		if (*f->temppath != '\0') {
 			unlinkat(p->rootfd, f->temppath, 0);
 		}
@@ -1128,6 +1137,11 @@ pkg_add_common(struct pkgdb *db, const char *path, unsigned flags,
 	/* analyse previous files */
 	f = NULL;
 	while (pkg_files(pkg, &f) == EPKG_OK) {
+		if (match_ucl_lists(f->path,
+		    pkg_config_get("FILES_IGNORE_GLOB"),
+		    pkg_config_get("FILES_IGNORE_REGEX"))) {
+			continue;
+		}
 		if (faccessat(pkg->rootfd, RELATIVE_PATH(f->path), F_OK, 0) == 0) {
 			f->previous = PKG_FILE_EXIST;
 			if (!pkgdb_file_exists(db, f->path)) {
@@ -1373,6 +1387,10 @@ pkg_add_fromdir(struct pkg *pkg, const char *src)
 
 	hardlinks = kh_init_hls();
 	while (pkg_files(pkg, &f) == EPKG_OK) {
+		if (match_ucl_lists(f->path,
+		    pkg_config_get("FILES_IGNORE_GLOB"),
+		    pkg_config_get("FILES_IGNORE_REGEX")))
+			continue;
 		if (fstatat(fromfd, RELATIVE_PATH(f->path), &st,
 		    AT_SYMLINK_NOFOLLOW) == -1) {
 			kh_destroy_hls(hardlinks);

libpkg/pkg_config.c

@@ -491,6 +491,18 @@ static struct config_entry c[] = {
 		"FALSE",
 		"Accept legacy package extensions when creating the repository",
 	},
+	{
+		PKG_ARRAY,
+		"FILES_IGNORE_GLOB",
+		"NULL",
+		"patterns of files to not extract from the package",
+	},
+	{
+		PKG_ARRAY,
+		"FILES_IGNORE_REGEX",
+		"NULL",
+		"patterns of files to not extract from the package",
+	},
 };
 
 static bool parsed = false;

libpkg/pkgdb.c

@@ -1817,6 +1817,12 @@ pkgdb_register_pkg(struct pkgdb *db, struct pkg *pkg, int forced,
 
 	while (pkg_files(pkg, &file) == EPKG_OK) {
 		bool		permissive = false;
+		if (match_ucl_lists(file->path,
+		    pkg_config_get("FILES_IGNORE_GLOB"),
+		    pkg_config_get("FILES_IGNORE_REGEX"))) {
+			continue;
+			printf("matched\n");
+		}
 
 		ret = run_prstmt(FILES, file->path, file->sum, package_id);
 		if (ret == SQLITE_DONE)