upstream/mercurial-mirror Files · tests/test-excessive-merge.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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        $ hg init

        $ echo foo > a

        $ echo foo > b

        $ hg add a b

        $ hg ci -m "test"

        $ echo blah > a

        $ hg ci -m "branch a"

        $ hg co 0

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

        $ echo blah > b

        $ hg ci -m "branch b"

        created new head

        $ HGMERGE=true hg merge 1

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

        (branch merge, don't forget to commit)

        $ hg ci -m "merge b/a -> blah"

        $ hg co 1

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

        $ HGMERGE=true hg merge 2

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

        (branch merge, don't forget to commit)

        $ hg ci -m "merge a/b -> blah"

        created new head

        $ hg log

        changeset:   4:2ee31f665a86

        tag:         tip

        parent:      1:96155394af80

        parent:      2:92cc4c306b19

        user:        test

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

        summary:     merge a/b -> blah

        changeset:   3:e16a66a37edd

        parent:      2:92cc4c306b19

        parent:      1:96155394af80

        user:        test

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

        summary:     merge b/a -> blah

        changeset:   2:92cc4c306b19

        parent:      0:5e0375449e74

        user:        test

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

        summary:     branch b

        changeset:   1:96155394af80

        user:        test

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

        summary:     branch a

        changeset:   0:5e0375449e74

        user:        test

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

        summary:     test

        $ hg debugindex --changelog

           rev    offset  length  ..... linkrev nodeid       p1           p2 (re)

             0         0      60  .....       0 5e0375449e74 000000000000 000000000000 (re)

             1        60      62  .....       1 96155394af80 5e0375449e74 000000000000 (re)

             2       122      62  .....       2 92cc4c306b19 5e0375449e74 000000000000 (re)

             3       184      69  .....       3 e16a66a37edd 92cc4c306b19 96155394af80 (re)

             4       253      69  .....       4 2ee31f665a86 96155394af80 92cc4c306b19 (re)

      revision 1

        $ hg manifest --debug 1

        79d7492df40aa0fa093ec4209be78043c181f094 644   a

        2ed2a3912a0b24502043eae84ee4b279c18b90dd 644   b

      revision 2

        $ hg manifest --debug 2

        2ed2a3912a0b24502043eae84ee4b279c18b90dd 644   a

        79d7492df40aa0fa093ec4209be78043c181f094 644   b

      revision 3

        $ hg manifest --debug 3

        79d7492df40aa0fa093ec4209be78043c181f094 644   a

        79d7492df40aa0fa093ec4209be78043c181f094 644   b

      revision 4

        $ hg manifest --debug 4

        79d7492df40aa0fa093ec4209be78043c181f094 644   a

        79d7492df40aa0fa093ec4209be78043c181f094 644   b

        $ hg debugindex a

           rev    offset  length  ..... linkrev nodeid       p1           p2 (re)

             0         0       5  .....       0 2ed2a3912a0b 000000000000 000000000000 (re)

             1         5       6  .....       1 79d7492df40a 2ed2a3912a0b 000000000000 (re)

        $ hg verify

        checking changesets

        checking manifests

        crosschecking files in changesets and manifests

        checking files

        2 files, 5 changesets, 4 total revisions

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				$ hg init

				$ echo foo > a
				$ echo foo > b
				$ hg add a b

				$ hg ci -m "test"

				$ echo blah > a

				$ hg ci -m "branch a"

				$ hg co 0
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved

				$ echo blah > b

				$ hg ci -m "branch b"
				created new head
				$ HGMERGE=true hg merge 1
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				(branch merge, don't forget to commit)

				$ hg ci -m "merge b/a -> blah"

				$ hg co 1
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				$ HGMERGE=true hg merge 2
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				(branch merge, don't forget to commit)
				$ hg ci -m "merge a/b -> blah"
				created new head

				$ hg log
				changeset: 4:2ee31f665a86
				tag: tip
				parent: 1:96155394af80
				parent: 2:92cc4c306b19
				user: test
				date: Thu Jan 01 00:00:00 1970 +0000
				summary: merge a/b -> blah

				changeset: 3:e16a66a37edd
				parent: 2:92cc4c306b19
				parent: 1:96155394af80
				user: test
				date: Thu Jan 01 00:00:00 1970 +0000
				summary: merge b/a -> blah

				changeset: 2:92cc4c306b19
				parent: 0:5e0375449e74
				user: test
				date: Thu Jan 01 00:00:00 1970 +0000
				summary: branch b

				changeset: 1:96155394af80
				user: test
				date: Thu Jan 01 00:00:00 1970 +0000
				summary: branch a

				changeset: 0:5e0375449e74
				user: test
				date: Thu Jan 01 00:00:00 1970 +0000
				summary: test

				$ hg debugindex --changelog
				rev offset length ..... linkrev nodeid p1 p2 (re)
				0 0 60 ..... 0 5e0375449e74 000000000000 000000000000 (re)
				1 60 62 ..... 1 96155394af80 5e0375449e74 000000000000 (re)
				2 122 62 ..... 2 92cc4c306b19 5e0375449e74 000000000000 (re)
				3 184 69 ..... 3 e16a66a37edd 92cc4c306b19 96155394af80 (re)
				4 253 69 ..... 4 2ee31f665a86 96155394af80 92cc4c306b19 (re)

				revision 1
				$ hg manifest --debug 1
				79d7492df40aa0fa093ec4209be78043c181f094 644 a
				2ed2a3912a0b24502043eae84ee4b279c18b90dd 644 b
				revision 2
				$ hg manifest --debug 2
				2ed2a3912a0b24502043eae84ee4b279c18b90dd 644 a
				79d7492df40aa0fa093ec4209be78043c181f094 644 b
				revision 3
				$ hg manifest --debug 3
				79d7492df40aa0fa093ec4209be78043c181f094 644 a
				79d7492df40aa0fa093ec4209be78043c181f094 644 b
				revision 4
				$ hg manifest --debug 4
				79d7492df40aa0fa093ec4209be78043c181f094 644 a
				79d7492df40aa0fa093ec4209be78043c181f094 644 b

				$ hg debugindex a
				rev offset length ..... linkrev nodeid p1 p2 (re)
				0 0 5 ..... 0 2ed2a3912a0b 000000000000 000000000000 (re)
				1 5 6 ..... 1 79d7492df40a 2ed2a3912a0b 000000000000 (re)

				$ hg verify
				checking changesets
				checking manifests
				crosschecking files in changesets and manifests
				checking files
				2 files, 5 changesets, 4 total revisions