Add an installd command to link files
Given a pair of absolute paths {from_path, to_path} , check that
they are both valid apk subpaths (eg. /data/app/package/foo) and
link(2) to_path to from_path. This is required by staged installs,
where we link existing apks and oat files to their staging location.
bug: 20889739
Change-Id: I3b5e3b43677af68be59308121a4409caaa6a72f0
diff --git a/cmds/installd/commands.cpp b/cmds/installd/commands.cpp
index 99da968..ebd71a0 100644
--- a/cmds/installd/commands.cpp
+++ b/cmds/installd/commands.cpp
@@ -1778,6 +1778,31 @@
return delete_dir_contents(apk_path, 1 /* also_delete_dir */ , NULL /* exclusion_predicate */);
}
+int link_file(const char* relative_path, const char* from_base, const char* to_base) {
+ char from_path[PKG_PATH_MAX];
+ char to_path[PKG_PATH_MAX];
+ snprintf(from_path, PKG_PATH_MAX, "%s/%s", from_base, relative_path);
+ snprintf(to_path, PKG_PATH_MAX, "%s/%s", to_base, relative_path);
+
+ if (validate_apk_path_subdirs(from_path)) {
+ ALOGE("invalid app data sub-path '%s' (bad prefix)\n", from_path);
+ return -1;
+ }
+
+ if (validate_apk_path_subdirs(to_path)) {
+ ALOGE("invalid app data sub-path '%s' (bad prefix)\n", to_path);
+ return -1;
+ }
+
+ const int ret = link(from_path, to_path);
+ if (ret < 0) {
+ ALOGE("link(%s, %s) failed : %s", from_path, to_path, strerror(errno));
+ return -1;
+ }
+
+ return 0;
+}
+
int calculate_oat_file_path(char path[PKG_PATH_MAX], const char *oat_dir, const char *apk_path,
const char *instruction_set) {
char *file_name_start;