Parse postinstall program progress updates.
In Android postinstall is expected to take a long time in common cases.
This patch allows the postinstall program to report back to the updater
a progress indication, which will then be forwarded to all the clients
listening. These progress updates are part of the FINALIZING status.
Bug: 27880754
TEST=Added unittests. Deployed an update to an edison-eng and post-install reported progress back with the postinstall_example.
(cherry picked from commit 0d29854cf5bb05a22cf161b50052539aa420a36e)
Change-Id: I003e996bd5a9acccfc83012345351174d269107c
diff --git a/common/utils.cc b/common/utils.cc
index 2b09560..304aba2 100644
--- a/common/utils.cc
+++ b/common/utils.cc
@@ -189,6 +189,35 @@
return true;
}
+bool ReadAll(
+ int fd, void* buf, size_t count, size_t* out_bytes_read, bool* eof) {
+ char* c_buf = static_cast<char*>(buf);
+ size_t bytes_read = 0;
+ *eof = false;
+ while (bytes_read < count) {
+ ssize_t rc = HANDLE_EINTR(read(fd, c_buf + bytes_read, count - bytes_read));
+ if (rc < 0) {
+ // EAGAIN and EWOULDBLOCK are normal return values when there's no more
+ // input and we are in non-blocking mode.
+ if (errno != EWOULDBLOCK && errno != EAGAIN) {
+ PLOG(ERROR) << "Error reading fd " << fd;
+ *out_bytes_read = bytes_read;
+ return false;
+ }
+ break;
+ } else if (rc == 0) {
+ // A value of 0 means that we reached EOF and there is nothing else to
+ // read from this fd.
+ *eof = true;
+ break;
+ } else {
+ bytes_read += rc;
+ }
+ }
+ *out_bytes_read = bytes_read;
+ return true;
+}
+
bool WriteAll(int fd, const void* buf, size_t count) {
const char* c_buf = static_cast<const char*>(buf);
ssize_t bytes_written = 0;