Don't retry bad request responses (#137)

These are returned for incorrect request paramaters (non-utf8, characters not allowed in usernames, etc.) and repeating the request without changing the parameters is pointless.

Log clearly when the initial parsing of a JSON object fails (#132)

* Split out root element parsing into a shared ParseJsonRoot; add better error logging.

* remove a couple of perhaps-overeager log lines; add a missing space to fix a typo.

* Properly initialize the tokener before use.

* Also, don't forget to free the tokener after use.

* respond to Leos review feedback

* fix build failure due to goto jumping over initialization

Log clearly when the initial parsing of a JSON object fails (#132)

* Split out root element parsing into a shared ParseJsonRoot; add better error logging.

* remove a couple of perhaps-overeager log lines; add a missing space to fix a typo.

* Properly initialize the tokener before use.

* Also, don't forget to free the tokener after use.

* respond to Leos review feedback

* fix build failure due to goto jumping over initialization

Log clearly when the initial parsing of a JSON object fails (#132)

* Split out root element parsing into a shared ParseJsonRoot; add better error logging.

* remove a couple of perhaps-overeager log lines; add a missing space to fix a typo.

* Properly initialize the tokener before use.

* Also, don't forget to free the tokener after use.

* respond to Leos review feedback

* fix build failure due to goto jumping over initialization

pam: bring back pam's account management implementation (#133)

With this change users can get back to using these pam modules for their
own custom pam configurations in a way to differentiate oslogin users (i.e.
reported issue #123).

PS: These modules will not be automatically added to google's managed pam
configurations by guest-agent.

build: fix DESTDIR concatenation (#124)

When updating the COS build we found out that the build system wasn't
properly concatenating DESTDIR and the target dirs if DESTDIR didn't
end with a slash. The following make call would produce an invalid
result:

make DESTDIR=/path/to/target LIBDIR=lib64

One would expect to have lib artifacts installed to
/path/to/target/lib64 instead we were installing artifacts to
/path/to/targetlib64.

build: fix clang build (#122)

Remove include/oslogin_sshca.h from the list of dependecies. It is
passed to the linker command as a part of $^ variable and causes
clang build error:

    clang: error: clang: cannot specify -o when generating multiple output fileserror:
    cannot specify -o when generating multiple output files

Update owners. (#121)

Fix HTTP calls retry logic (#117)

packaging: make the dependency explicit (#120)

Force guest-agent to be present in at least a given version.