convert: add a mode where mercurial_sink skips empty revisions. The getchanges function of some converter_source classes can return some false positives. I.e. they sometimes claim that a file "foo" was changed in some revision, even though its contents are still the same. convert_svn is particularly bad, but I think this can also happen with convert_cvs and, at least in theory, with mercurial_source. For regular conversions this is not really a problem - as long as getfile returns the right contents, we'll get a converted revision with the right contents. But when we use --filemap, this could lead to superfluous revisions being converted. Instead of fixing every converter_source, I decided to change mercurial_sink to work around this problem. When --filemap is used, we're interested only in revisions that touch some specific files. If a revision doesn't change any of these files, then we're not interested in it (at least for revisions with a single parent; merges are special). For mercurial_sink, we abuse this property and rollback a commit if the manifest text hasn't changed. This avoids duplicating the logic from localrepo.filecommit to detect unchanged files.

     1

#!/bin/sh

     2

     3

mkdir t

     4

cd t

     5

hg init

     6

echo "added file1" > file1

     7

echo "added file2" > file2

     8

hg add file1 file2

     9

hg commit -m "added file1 and file2" -d "1000000 0" -u user

    10

echo "changed file1" >> file1

    11

hg commit -m "changed file1" -d "1000000 0" -u user

    12

hg -q log

    13

hg id

    14

hg update -C 0

    15

hg id

    16

echo "changed file1" >> file1

    17

hg id

    18

hg revert --all

    19

hg diff

    20

hg status

    21

hg id

    22

hg update

    23

hg diff

    24

hg status

    25

hg id

    26

hg update -C 0

    27

echo "changed file1" >> file1

    28

hg update

    29

hg diff

    30

hg status

    31

hg id

    32

hg revert --all

    33

hg diff

    34

hg status

    35

hg id

    36

hg revert -r tip --all

    37

hg diff

    38

hg status

    39

hg id

    40

hg update -C

    41

hg diff

    42

hg status

    43

hg id

    44