libcutils: fs_config: alias "system/<partition>/" to "<partition>/"
For the known partitions entrenched in the build system: vendor, oem
and odm only. We will alias entries that reference system/<partition>
and <partition>/ so that if either are specified, the rule will apply
to both possible paths.
Test: gTest libcutils-tests
Bug: 37703469
Change-Id: Ida9405cbed323489a3d0599c1645e9be2c7b9d08
diff --git a/libcutils/fs_config.cpp b/libcutils/fs_config.cpp
index 2b3443f..e08ee70 100644
--- a/libcutils/fs_config.cpp
+++ b/libcutils/fs_config.cpp
@@ -273,6 +273,36 @@
return fd;
}
+// if path is "vendor/<stuff>", "oem/<stuff>" or "odm/<stuff>"
+static bool is_partition(const char* path, size_t len) {
+ static const char* partitions[] = {"vendor/", "oem/", "odm/"};
+ for (size_t i = 0; i < (sizeof(partitions) / sizeof(partitions[0])); ++i) {
+ size_t plen = strlen(partitions[i]);
+ if (len <= plen) continue;
+ if (!strncmp(path, partitions[i], plen)) return true;
+ }
+ return false;
+}
+
+// alias prefixes of "<partition>/<stuff>" to "system/<partition>/<stuff>" or
+// "system/<partition>/<stuff>" to "<partition>/<stuff>"
+static bool prefix_cmp(const char* prefix, const char* path, size_t len) {
+ if (!strncmp(prefix, path, len)) return true;
+
+ static const char system[] = "system/";
+ if (!strncmp(path, system, strlen(system))) {
+ path += strlen(system);
+ } else if (len <= strlen(system)) {
+ return false;
+ } else if (strncmp(prefix, system, strlen(system))) {
+ return false;
+ } else {
+ prefix += strlen(system);
+ len -= strlen(system);
+ }
+ return is_partition(prefix, len) && !strncmp(prefix, path, len);
+}
+
static bool fs_config_cmp(bool dir, const char* prefix, size_t len, const char* path, size_t plen) {
if (dir) {
if (plen < len) {
@@ -281,13 +311,13 @@
} else {
// If name ends in * then allow partial matches.
if (prefix[len - 1] == '*') {
- return !strncmp(prefix, path, len - 1);
+ return prefix_cmp(prefix, path, len - 1);
}
if (plen != len) {
return false;
}
}
- return !strncmp(prefix, path, len);
+ return prefix_cmp(prefix, path, len);
}
void fs_config(const char* path, int dir, const char* target_out_path, unsigned* uid, unsigned* gid,