Mercurial > hg
view tests/test-convert-svn-branches.t @ 27430:e240e914d226 stable
revlog: seek to end of file before writing (issue4943)
Revlogs were recently refactored to open file handles in "a+" and use a
persistent file handle for reading and writing. This drastically
reduced the number of file handles being opened.
Unfortunately, it appears that some versions of Solaris lose the file
offset when performing a write after the handle has been seeked.
The simplest workaround is to seek to EOF on files opened in a+ mode
before writing to them, which is what this patch does.
Ideally, this code would exist in the vfs layer. However, this would
require creating a proxy class for file objects in order to provide a
custom implementation of write(). This would add overhead. Since
revlogs are the only files we open in a+ mode, the one-off workaround
in revlog.py should be sufficient.
This patch appears to have little to no impact on performance on my
Linux machine.
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Thu, 17 Dec 2015 17:16:02 -0800 |
parents | 584044e5ad57 |
children | 46da52f4b820 |
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#require svn svn-bindings $ cat >> $HGRCPATH <<EOF > [extensions] > convert = > EOF $ svnadmin create svn-repo $ svnadmin load -q svn-repo < "$TESTDIR/svn/branches.svndump" Convert trunk and branches $ cat > branchmap <<EOF > old3 newbranch > > > EOF $ hg convert --branchmap=branchmap --datesort -r 10 svn-repo A-hg initializing destination A-hg repository scanning source... sorting... converting... 10 init projA 9 hello 8 branch trunk, remove c and dir 7 change a 6 change b 5 move and update c 4 move and update c 3 change b again 2 move to old2 1 move back to old 0 last change to a Test template keywords $ hg -R A-hg log --template '{rev} {svnuuid}{svnpath}@{svnrev}\n' 10 644ede6c-2b81-4367-9dc8-d786514f2cde/trunk@10 9 644ede6c-2b81-4367-9dc8-d786514f2cde/branches/old@9 8 644ede6c-2b81-4367-9dc8-d786514f2cde/branches/old2@8 7 644ede6c-2b81-4367-9dc8-d786514f2cde/branches/old@7 6 644ede6c-2b81-4367-9dc8-d786514f2cde/trunk@6 5 644ede6c-2b81-4367-9dc8-d786514f2cde/branches/old@6 4 644ede6c-2b81-4367-9dc8-d786514f2cde/branches/old@5 3 644ede6c-2b81-4367-9dc8-d786514f2cde/trunk@4 2 644ede6c-2b81-4367-9dc8-d786514f2cde/branches/old@3 1 644ede6c-2b81-4367-9dc8-d786514f2cde/trunk@2 0 644ede6c-2b81-4367-9dc8-d786514f2cde/trunk@1 Convert again $ hg convert --branchmap=branchmap --datesort svn-repo A-hg scanning source... sorting... converting... 0 branch trunk@1 into old3 $ cd A-hg $ hg log -G --template 'branch={branches} {rev} {desc|firstline} files: {files}\n' o branch=newbranch 11 branch trunk@1 into old3 files: | | o branch= 10 last change to a files: a | | | | o branch=old 9 move back to old files: | | | | | o branch=old2 8 move to old2 files: | | | | | o branch=old 7 change b again files: b | | | | o | branch= 6 move and update c files: b | | | | | o branch=old 5 move and update c files: c | | | | | o branch=old 4 change b files: b | | | | o | branch= 3 change a files: a | | | | | o branch=old 2 branch trunk, remove c and dir files: c | |/ | o branch= 1 hello files: a b c dir/e |/ o branch= 0 init projA files: $ hg branches newbranch 11:a6d7cc050ad1 default 10:6e2b33404495 old 9:93c4b0f99529 old2 8:b52884d7bead (inactive) $ hg tags -q tip $ cd .. Test hg failing to call itself $ HG=foobar hg convert svn-repo B-hg 2>&1 | grep abort abort: Mercurial failed to run itself, check hg executable is in PATH Convert 'trunk' to branch other than 'default' $ cat > branchmap <<EOF > default hgtrunk > > > EOF $ hg convert --branchmap=branchmap --datesort -r 10 svn-repo C-hg initializing destination C-hg repository scanning source... sorting... converting... 10 init projA 9 hello 8 branch trunk, remove c and dir 7 change a 6 change b 5 move and update c 4 move and update c 3 change b again 2 move to old2 1 move back to old 0 last change to a $ cd C-hg $ hg branches --template '{branch}\n' hgtrunk old old2 $ cd ..