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rhg: centralize index header parsing...

rhg: centralize index header parsing Centralize index header parsing, parse the generaldelta flag, and leave breadcrumbs to relate the code to python. Differential Revision: https://phab.mercurial-scm.org/D11881

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        Arseniy Alekseyev
    
rhg: demonstrate that rhg breaks on non-generaldelta revlogs...

              r49287
            
        $ NO_FALLBACK="env RHG_ON_UNSUPPORTED=abort"

        $ cat << EOF >> $HGRCPATH

        > [format]

        > sparse-revlog = no

        > EOF

        $ hg init repo --config format.generaldelta=no --config format.usegeneraldelta=no

        $ cd repo

        $ (echo header; seq.py 20) > f

        $ hg commit -q -Am initial

        $ (echo header; seq.py 20; echo footer) > f

        $ hg commit -q -Am x

        $ hg update ".^"

        1 files updated, 0 files merged, 0 files removed, 0 files unresolved

        $ (seq.py 20; echo footer) > f

        $ hg commit -q -Am y

        $ hg debugdeltachain f --template '{rev} {prevrev} {deltatype}\n'

        0 -1 base

        1 0 prev

        2 1 prev

      rhg breaks on non-generaldelta revlogs:

        $ $NO_FALLBACK hg cat f -r . | f --sha256 --size

        abort: corrupted revlog (rhg !)

        size=0, sha256=e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 (rhg !)

        size=58, sha256=0cf0386dd4813cc3b957ea790146627dfc0ec42ad3fcf47221b9842e4d5764c1 (no-rhg !)

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Arseniy Alekseyev rhg: demonstrate that rhg breaks on non-generaldelta revlogs...	r49287
		$ NO_FALLBACK="env RHG_ON_UNSUPPORTED=abort"

		$ cat << EOF >> $HGRCPATH
		> [format]
		> sparse-revlog = no
		> EOF

		$ hg init repo --config format.generaldelta=no --config format.usegeneraldelta=no
		$ cd repo
		$ (echo header; seq.py 20) > f
		$ hg commit -q -Am initial
		$ (echo header; seq.py 20; echo footer) > f
		$ hg commit -q -Am x
		$ hg update ".^"
		1 files updated, 0 files merged, 0 files removed, 0 files unresolved
		$ (seq.py 20; echo footer) > f
		$ hg commit -q -Am y
		$ hg debugdeltachain f --template '{rev} {prevrev} {deltatype}\n'
		0 -1 base
		1 0 prev
		2 1 prev

		rhg breaks on non-generaldelta revlogs:

		$ $NO_FALLBACK hg cat f -r . \| f --sha256 --size
		abort: corrupted revlog (rhg !)
		size=0, sha256=e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 (rhg !)
		size=58, sha256=0cf0386dd4813cc3b957ea790146627dfc0ec42ad3fcf47221b9842e4d5764c1 (no-rhg !)