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2021-01-01update copyrights for 2021
Using "make update-copyrights" after setting GNULIB_PATH in my config.mak
2020-09-19gcf2: transparently retry on missing OID
Since we only get OIDs from trusted local data sources (over.sqlite3), we can safely retry within the -gcf2 process without worry about clients spamming us with requests for invalid OIDs and triggering reopens.
2020-09-19gcf2: libgit2-based git cat-file alternative
Having tens of thousands of inboxes and associated git processes won't work well, so we'll use libgit2 to access the object DB directly. We only care about OID lookups and won't need to rely on per-repo revision names or paths. The Git::Raw XS package won't be used since its manpages don't promise a stable API. Since we already use Inline::C and have experience with I::C when it comes to compatibility, this only introduces libgit2 itself as a source of new incompatibilities. This also provides an excuse for me to writev(2) to reduce syscalls, but liburing is on the horizon for next year.