save a last_install file with the result of the last package install attempt

When installing a package, create /cache/recovery/last_install, which
contains the filename of the package and a 1 or 0 for success or
failure.

Also, don't mount ext4 and vfat filesystems as read-only (on devices
where /cache is ext4, we need it to be read-write).

Change-Id: I0cf2a1921bbd65e06343aa74e2006577fac77c2c

1 files changed, 3 insertions, 0 deletions

diff --git a/common.h b/common.h
index cba4c86..ef2fe9f 100644
--- a/common.h
+++ b/common.h
@@ -126,4 +126,7 @@ typedef struct {
 
 } UIParameters;
 
+// fopen a file, mounting volumes and making parent dirs as necessary.
+FILE* fopen_path(const char *path, const char *mode);
+
 #endif  // RECOVERY_COMMON_H