convert/gnuarch: parse continuation-of revisions in gnuarch source In GNU Arch, continuation-of was often used for: - tagging revisions - continue working on a project in a new archive, because arch was scaling poorly in revision numbers (cat-logs were slow to be parsed and scanned through) - very similar to the previous point, fork his own branch of a project. Parsing this header information will allow to 'follow' new history because it often hints at older/forked/personal revision trees. This patch however just implements the parsing of the continuation-of header. A followup patch will implement the proper use of this new information.

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#!/bin/sh

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hg init repo

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cd repo

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echo foo > foo

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hg ci -qAm 'add foo' -d '0 0'

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echo >> foo

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hg ci -m 'change foo' -d '0 0'

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hg up -qC 0

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echo bar > bar

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hg ci -qAm 'add bar' -d '0 0'

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hg log

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cd ..

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hg init copy

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cd copy

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echo '% pull a missing revision'

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hg pull -qr missing ../repo

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echo '% pull -r 0'

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hg pull -qr 0 ../repo

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hg log

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echo '% pull -r 1'

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hg pull -qr 1 ../repo

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hg log

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# this used to abort: received changelog group is empty

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echo '% pull -r 1 again'

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hg pull -qr 1 ../repo