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tests: test behavior of IOError during transactions (issue5658)...
tests: test behavior of IOError during transactions (issue5658) ui._write(), ui._write_err(), and ui.flush() all trap IOError and re-raise as error.StdioError. If a caller doesn't catch StdioError when writing to stdio, it could bubble all the way to dispatch. This commit adds tests for I/O failures around various transaction operations. The most notable badness is during abort. Here, an uncaught StdioError will result in incomplete transaction rollback, requiring an `hg rollback` to recover. This can result in a client "corrupting" a remote repo via terminated HTTP and SSH socket.

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graphnode.tmpl
7 lines | 201 B | application/x-cheetah | CheetahLexer
changeset: {node}
user: {user}
date: {age}
summary: {desc}
{branches%branchname}{tags%tagname}{bookmarks%bookmarkname}
node: ({col}, {row}) (color {color})
{edges%graphedge}