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authorLibravatar Michael Haggerty <mhagger@alum.mit.edu>2013-04-22 21:52:29 +0200
committerLibravatar Junio C Hamano <gitster@pobox.com>2013-05-01 15:33:10 -0700
commit694b7a1999fa331e00ed9297f3b6b01f7da7a104 (patch)
treede2b4beb210056fb0d30953b0c75186d7f30715a /contrib/thunderbird-patch-inline/README
parentt3211: demonstrate loss of peeled refs if a packed ref is deleted (diff)
downloadtgif-694b7a1999fa331e00ed9297f3b6b01f7da7a104.tar.xz
repack_without_ref(): write peeled refs in the rewritten file
When a reference that existed in the packed-refs file is deleted, the packed-refs file must be rewritten. Previously, the file was rewritten without any peeled refs, even if the file contained peeled refs when it was read. This was not a bug, because the packed-refs file header didn't claim that the file contained peeled values. But it had a performance cost, because the repository would lose the benefit of having precomputed peeled references until pack-refs was run again. Teach repack_without_ref() to write peeled refs to the packed-refs file (regardless of whether they were present in the old version of the file). This means that if the old version of the packed-refs file was not fully peeled, then repack_without_ref() will have to peel references. To avoid the expense of reading lots of loose references, we take two shortcuts relative to pack-refs: * If the peeled value of a reference is already known (i.e., because it was read from the old version of the packed-refs file), then output that peeled value again without any checks. This is the usual code path and should avoid any noticeable overhead. (This is different than pack-refs, which always re-peels references.) * We don't verify that the packed ref is still current. It could be that a packed references is overridden by a loose reference, in which case the packed ref is no longer needed and might even refer to an object that has been garbage collected. But we don't check; instead, we just try to peel all references. If peeling is successful, the peeled value is written out (even though it might not be needed any more); if not, then the reference is silently omitted from the output. The extra overhead of peeling references in repack_without_ref() should only be incurred the first time the packed-refs file is written by a version of Git that knows about the "fully-peeled" attribute. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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