upstream/mercurial-mirror Files · tests/test-revlog-v2.t

show: use consistent (and possibly shorter) node lengths...

show: use consistent (and possibly shorter) node lengths `hg show` makes heavy use of shortest() to limit the length of the node hash. For the "stack" and "work" views, you are often looking at multiple lines of similar output for "lines" of work. It is visually appeasing for things to vertically align. A naive use of {shortest(node, N)} could result in variable length nodes and for the first character of the description to vary by a column or two. We implement a function to determine the longest shortest prefix for a set of revisions. The new function is used to determine the printed node length for all `hg show` views. .. feature:: show: use consistent node length in views Our previous shortest node length of 5 was arbitrarily chosen. shortest() already does the work of ensuring that a partial node isn't ambiguous with an integer revision, which is our primary risk of a collision for very short nodes. It should be safe to go with the shortest node possible. Existing code is also optimized to handle nodes as short as 4. So, we decrease the minimum hash length from 5 to 4. We also add a test demonstrating that prefix collisions increase the node length. .. feature:: show: decrease minimum displayed hash length from 5 to 4 Differential Revision: https://phab.mercurial-scm.org/D558

Gregory Szorc - - Load All Authors

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      A repo with unknown revlogv2 requirement string cannot be opened

        $ hg init invalidreq

        $ cd invalidreq

        $ echo exp-revlogv2.unknown >> .hg/requires

        $ hg log

        abort: repository requires features unknown to this Mercurial: exp-revlogv2.unknown!

        (see https://mercurial-scm.org/wiki/MissingRequirement for more information)

        [255]

        $ cd ..

      Can create and open repo with revlog v2 requirement

        $ cat >> $HGRCPATH << EOF

        > [experimental]

        > revlogv2 = enable-unstable-format-and-corrupt-my-data

        > EOF

        $ hg init empty-repo

        $ cd empty-repo

        $ cat .hg/requires

        dotencode

        exp-revlogv2.0

        fncache

        store

        $ hg log

      Unknown flags to revlog are rejected

        >>> with open('.hg/store/00changelog.i', 'wb') as fh:

        ...     fh.write('\x00\x04\xde\xad')

        $ hg log

        abort: unknown flags (0x04) in version 57005 revlog 00changelog.i!

        [255]

        $ cd ..

      Writing a simple revlog v2 works

        $ hg init simple

        $ cd simple

        $ touch foo

        $ hg -q commit -A -m initial

        $ hg log

        changeset:   0:96ee1d7354c4

        tag:         tip

        user:        test

        date:        Thu Jan 01 00:00:00 1970 +0000

        summary:     initial

      Header written as expected (changelog always disables generaldelta)

        $ f --hexdump --bytes 4 .hg/store/00changelog.i

        .hg/store/00changelog.i:

        0000: 00 01 de ad                                     |....|

        $ f --hexdump --bytes 4 .hg/store/data/foo.i

        .hg/store/data/foo.i:

        0000: 00 03 de ad                                     |....|

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				A repo with unknown revlogv2 requirement string cannot be opened

				$ hg init invalidreq
				$ cd invalidreq
				$ echo exp-revlogv2.unknown >> .hg/requires
				$ hg log
				abort: repository requires features unknown to this Mercurial: exp-revlogv2.unknown!
				(see https://mercurial-scm.org/wiki/MissingRequirement for more information)
				[255]
				$ cd ..

				Can create and open repo with revlog v2 requirement

				$ cat >> $HGRCPATH << EOF
				> [experimental]
				> revlogv2 = enable-unstable-format-and-corrupt-my-data
				> EOF

				$ hg init empty-repo
				$ cd empty-repo
				$ cat .hg/requires
				dotencode
				exp-revlogv2.0
				fncache
				store

				$ hg log

				Unknown flags to revlog are rejected

				>>> with open('.hg/store/00changelog.i', 'wb') as fh:
				... fh.write('\x00\x04\xde\xad')

				$ hg log
				abort: unknown flags (0x04) in version 57005 revlog 00changelog.i!
				[255]

				$ cd ..

				Writing a simple revlog v2 works

				$ hg init simple
				$ cd simple
				$ touch foo
				$ hg -q commit -A -m initial

				$ hg log
				changeset: 0:96ee1d7354c4
				tag: tip
				user: test
				date: Thu Jan 01 00:00:00 1970 +0000
				summary: initial

				Header written as expected (changelog always disables generaldelta)

				$ f --hexdump --bytes 4 .hg/store/00changelog.i
				.hg/store/00changelog.i:
				0000: 00 01 de ad \|....\|

				$ f --hexdump --bytes 4 .hg/store/data/foo.i
				.hg/store/data/foo.i:
				0000: 00 03 de ad \|....\|