nodemap: track the maximum revision tracked in the nodemap
We need a simple way to detect when the on disk data contains less revision
than the index we read from disk. The docket file is meant for this, we just had
to start tracking that data.
We should also try to detect strip operation, but we will deal with this in
later changesets. Right now we are focusing on defining the API for index
supporting persistent nodemap.
Differential Revision: https://phab.mercurial-scm.org/D7888
===================================
Test the persistent on-disk nodemap
===================================
$ hg init test-repo
$ cd test-repo
$ cat << EOF >> .hg/hgrc
> [experimental]
> exp-persistent-nodemap=yes
> [devel]
> persistent-nodemap=yes
> EOF
$ hg debugbuilddag .+5000
$ hg debugnodemap --metadata
uid: ???????????????? (glob)
tip-rev: 5000
$ f --size .hg/store/00changelog.n
.hg/store/00changelog.n: size=26
$ f --sha256 .hg/store/00changelog-*.nd
.hg/store/00changelog-????????????????.nd: sha256=b961925120e1c9bc345c199b2cc442abc477029fdece37ef9d99cbe59c0558b7 (glob)
$ hg debugnodemap --dump-new | f --sha256 --size
size=122880, sha256=b961925120e1c9bc345c199b2cc442abc477029fdece37ef9d99cbe59c0558b7
$ hg debugnodemap --dump-disk | f --sha256 --bytes=256 --hexdump --size
size=122880, sha256=b961925120e1c9bc345c199b2cc442abc477029fdece37ef9d99cbe59c0558b7
0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
0010: ff ff ff ff ff ff ff ff ff ff fa c2 ff ff ff ff |................|
0020: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
0030: ff ff ff ff ff ff ed b3 ff ff ff ff ff ff ff ff |................|
0040: ff ff ff ff ff ff ee 34 00 00 00 00 ff ff ff ff |.......4........|
0050: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
0060: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
0070: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
0080: ff ff ff ff ff ff f8 50 ff ff ff ff ff ff ff ff |.......P........|
0090: ff ff ff ff ff ff ff ff ff ff ec c7 ff ff ff ff |................|
00a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
00b0: ff ff ff ff ff ff fa be ff ff f2 fc ff ff ff ff |................|
00c0: ff ff ff ff ff ff ef ea ff ff ff ff ff ff f9 17 |................|
00d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
00e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
00f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
$ hg debugnodemap --check
revision in index: 5001
revision in nodemap: 5001
add a new commit
$ hg up
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo foo > foo
$ hg add foo
$ hg ci -m 'foo'
$ hg debugnodemap --metadata
uid: ???????????????? (glob)
tip-rev: 5001
$ f --size .hg/store/00changelog.n
.hg/store/00changelog.n: size=26
(The pure code use the debug code that perform incremental update, the C code reencode from scratch)
#if pure
$ f --sha256 .hg/store/00changelog-*.nd --size
.hg/store/00changelog-????????????????.nd: size=123072, sha256=136472751566c8198ff09e306a7d2f9bd18bd32298d614752b73da4d6df23340 (glob)
#else
$ f --sha256 .hg/store/00changelog-*.nd --size
.hg/store/00changelog-????????????????.nd: size=122880, sha256=bfafebd751c4f6d116a76a37a1dee2a251747affe7efbcc4f4842ccc746d4db9 (glob)
#endif
$ hg debugnodemap --check
revision in index: 5002
revision in nodemap: 5002