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authorLibravatar Brad King <brad.king@kitware.com>2013-09-04 11:22:43 -0400
committerLibravatar Junio C Hamano <gitster@pobox.com>2013-09-04 11:10:28 -0700
commit98aee92d5c9e5161a8c11b7666996e4ffffe80ab (patch)
treede4b08360058b244cc3ef5b2858d1da7fc4bad26 /contrib/ciabot
parentrefs: add function to repack without multiple refs (diff)
downloadtgif-98aee92d5c9e5161a8c11b7666996e4ffffe80ab.tar.xz
refs: add update_refs for multiple simultaneous updates
Add 'struct ref_update' to encode the information needed to update or delete a ref (name, new sha1, optional old sha1, no-deref flag). Add function 'update_refs' accepting an array of updates to perform. First sort the input array to order locks consistently everywhere and reject multiple updates to the same ref. Then acquire locks on all refs with verified old values. Then update or delete all refs accordingly. Fail if any one lock cannot be obtained or any one old value does not match. Though the refs themselves cannot be modified together in a single atomic transaction, this function does enable some useful semantics. For example, a caller may create a new branch starting from the head of another branch and rewind the original branch at the same time. This transfers ownership of commits between branches without risk of losing commits added to the original branch by a concurrent process, or risk of a concurrent process creating the new branch first. Signed-off-by: Brad King <brad.king@kitware.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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