Size of the abbreviated commit id to use. This value is the lower bound for the length of the abbreviated string. The default is 7.
Set to use the long format even when a shorter name could be used.
If the workdir is dirty and this is set, this string will be appended to the description string.
Describe format options structure
Initialize with GIT_DESCRIBE_FORMAT_OPTIONS_INIT. Alternatively, you can use git_describe_format_options_init.