get rid of unneeded recv_imsg_error calls got_privsep_recv_imsg users don't need to bother to look whether the imsg type is GOT_IMSG_ERROR because got_privsep_recv_imsg already takes care of that and turns GOT_IMSG_ERROR into `struct got_error's automatically. ok stsp@

rework got_privesp_recv_tree to use got_privsep_recv_imsg ok stsp@

add signer_id option to got.conf(5) Setting this option will cause 'got tag' to sign all created tags using the SSH key, unless overridden by the -s flag. ok stsp@

create and verify tags signed by SSH keys This adds a new -s flag to 'got tag' that specifies the signer identity (for example, a key file) of the tagger. The tag object will include a signature that validates each of the tag object headers and the tag message. Verifying these signed tags requires maintaining an allowed signers file which maps signer identities (i.e. the email address of the tagger) to SSH public keys. See ssh-keygen(1) for more details of the allowed signers file. After creating this file and providing the path to it in got.conf(5) using the allowed_signers option, tags may be verified using with 'got tag -V tag_name'. The return code will be non-zero if a signature fails to verify. ok stsp@

fix imsg_add TREE_ENTRY: Result too large on i386 There's a math error when computing the size of one entries in the batching code. Reported by semarie, ok semarie stsp

implement support for commit coloring in got-read-pack for speed ok op, tracey

build with -Wmissing-prototypes ok stsp@

fix unexpected imsg error after incomplete enumeration in got-read-pack reported by jrick and op@ ok op@

memset all stack-allocated structs used to send messages; ok stsp@

zero the whole struct got_imsg_object before sending it otherwise some fields may be unitialized and fail the validation done on the receiving side. ok stsp@

fix a harmless off-by-one from previous commit

fix a bug in got_privsep_send_object_idlist() exposed by recent changes The old code did not work correctly if only a single object Id was to be sent to got-read-pack. Make got-read-pack error out if the list of commits for object enumeration is empty to catch this problem if it occurs again. Found by the send_basic test, which was failing with GOT_TEST_PACK=1 ok tracey

let got-read-pack be explicit about whether it could enumerate all objects This allows the main process to avoid looping over all object IDs again in case the pack file used for enumeration is complete. ok op@

remove trailing whitespaces

compute object size, not pointer size in this case they're luckily the same; got_imsg_object_idlist and got_imsg_reused_delta only have one size_t long field. ok stsp@