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.

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#!/bin/sh

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# No local source

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hg clone a b

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echo $?

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# No remote source

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hg clone http://127.0.0.1:3121/a b

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echo $?

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rm -rf b # work around bug with http clone

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# Inaccessible source

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mkdir a

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chmod 000 a

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hg clone a b

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echo $?

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# Inaccessible destination

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mkdir b

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cd b

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hg init

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hg clone . ../a

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echo $?

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cd ..

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chmod 700 a

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rm -r a b

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# Source of wrong type

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if "$TESTDIR/hghave" -q fifo; then

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    mkfifo a

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    hg clone a b

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    echo $?

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    rm a

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else

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    echo "abort: repository a not found!"

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    echo 255

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fi

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# Default destination, same directory

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mkdir q

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cd q

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hg init

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cd ..

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hg clone q

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true