This function will try to read a file into a byte buffer, and, if the
file doesn't exist, create its containing directory and the file itself.
If any of those actions fail due to permissions, the function will print
a warning about running the tool as root.
Reading from the file and bundle databases works like this, so the error
checking should be implemented in a single place.
Also, use the new function in ReadFileDatabase().
Signed-off-by: Érico Rolim <erico.erc@gmail.com>
- Introduces dependency on sys/unix for unix.Access. This is necessary
only in keys.go, since we run 'sbsign' as a command and can't check if
it failed due to permissions.
- Allows removing special casing in main.go for commands that don't
require root permissions.
- ReadFileDatabase() can now return errors due to the multiple ways in
which it can fail; it also warns the user about possibly requiring root.
- ReadFileDatabase() was using the global DBPath instead of its dbpath
parameter in multiple places. This has been fixed.
- VerifyESP() can now run without root.
- SignFile() checks if it can read the DB key before running sbsign.
Signed-off-by: Érico Rolim <erico.erc@gmail.com>
Morten Linderud
igo95862
Érico Rolim