Move fstree dirscan code back to libfstree

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

2 files changed, 136 insertions, 1 deletions

diff --git a/lib/fstree/Makemodule.am b/lib/fstree/Makemodule.am
index 56394a6..97a2e6b 100644
--- a/lib/fstree/Makemodule.am
+++ b/lib/fstree/Makemodule.am
@@ -1,7 +1,7 @@
 libfstree_a_SOURCES = lib/fstree/fstree.c lib/fstree/fstree_from_file.c
 libfstree_a_SOURCES += lib/fstree/fstree_sort.c lib/fstree/hardlink.c
 libfstree_a_SOURCES += lib/fstree/post_process.c lib/fstree/get_path.c
-libfstree_a_SOURCES += lib/fstree/mknode.c
+libfstree_a_SOURCES += lib/fstree/mknode.c lib/fstree/fstree_from_dir.c
 libfstree_a_SOURCES += lib/fstree/add_by_path.c lib/fstree/get_by_path.c
 libfstree_a_SOURCES += include/fstree.h lib/fstree/internal.h
 libfstree_a_SOURCES += lib/fstree/source_date_epoch.c
diff --git a/lib/fstree/fstree_from_dir.c b/lib/fstree/fstree_from_dir.c
new file mode 100644
index 0000000..e61b706
--- /dev/null
+++ b/lib/fstree/fstree_from_dir.c
@@ -0,0 +1,135 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * fstree_from_dir.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+#include "fstree.h"
+
+#include <dirent.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#ifdef _WIN32
+int fstree_from_dir(fstree_t *fs, const char *path, unsigned int flags)
+{
+	(void)fs; (void)path; (void)flags;
+	fputs("Packing a directory is not supported on Windows.\n", stderr);
+	return -1;
+}
+#else
+static int populate_dir(int dir_fd, fstree_t *fs, tree_node_t *root,
+			dev_t devstart, unsigned int flags)
+{
+	char *extra = NULL;
+	struct dirent *ent;
+	struct stat sb;
+	tree_node_t *n;
+	int childfd;
+	DIR *dir;
+
+	dir = fdopendir(dir_fd);
+	if (dir == NULL) {
+		perror("fdopendir");
+		close(dir_fd);
+		return -1;
+	}
+
+	/* XXX: fdopendir can dup and close dir_fd internally
+	   and still be compliant with the spec. */
+	dir_fd = dirfd(dir);
+
+	for (;;) {
+		errno = 0;
+		ent = readdir(dir);
+
+		if (ent == NULL) {
+			if (errno) {
+				perror("readdir");
+				goto fail;
+			}
+			break;
+		}
+
+		if (!strcmp(ent->d_name, "..") || !strcmp(ent->d_name, "."))
+			continue;
+
+		if (fstatat(dir_fd, ent->d_name, &sb, AT_SYMLINK_NOFOLLOW)) {
+			perror(ent->d_name);
+			goto fail;
+		}
+
+		if ((flags & DIR_SCAN_ONE_FILESYSTEM) && sb.st_dev != devstart)
+			continue;
+
+		if (S_ISLNK(sb.st_mode)) {
+			extra = calloc(1, sb.st_size + 1);
+			if (extra == NULL)
+				goto fail_rdlink;
+
+			if (readlinkat(dir_fd, ent->d_name,
+				       extra, sb.st_size) < 0) {
+				goto fail_rdlink;
+			}
+
+			extra[sb.st_size] = '\0';
+		}
+
+		if (!(flags & DIR_SCAN_KEEP_TIME))
+			sb.st_mtime = fs->defaults.st_mtime;
+
+		n = fstree_mknode(root, ent->d_name, strlen(ent->d_name),
+				  extra, &sb);
+		if (n == NULL) {
+			perror("creating tree node");
+			goto fail;
+		}
+
+		free(extra);
+		extra = NULL;
+
+		if (S_ISDIR(n->mode)) {
+			childfd = openat(dir_fd, n->name, O_DIRECTORY |
+					 O_RDONLY | O_CLOEXEC);
+			if (childfd < 0) {
+				perror(n->name);
+				goto fail;
+			}
+
+			if (populate_dir(childfd, fs, n, devstart, flags))
+				goto fail;
+		}
+	}
+
+	closedir(dir);
+	return 0;
+fail_rdlink:
+	perror("readlink");
+fail:
+	closedir(dir);
+	free(extra);
+	return -1;
+}
+
+int fstree_from_dir(fstree_t *fs, const char *path, unsigned int flags)
+{
+	struct stat sb;
+	int fd;
+
+	fd = open(path, O_DIRECTORY | O_RDONLY | O_CLOEXEC);
+	if (fd < 0) {
+		perror(path);
+		return -1;
+	}
+
+	if (fstat(fd, &sb)) {
+		perror(path);
+		close(fd);
+		return -1;
+	}
+
+	return populate_dir(fd, fs, fs->root, sb.st_dev, flags);
+}
+#endif