svn-bisect - Online in the Cloud

PROGRAM:

NAME

svn-bisect - Bisect Subversion revisions to find a regression

SYNOPSIS

svn-bisect start [good_rev [bad_rev]]

svn-bisect {good|bad} [rev]

svn-bisect run command

svn-bisect reset

svn-bisect status

DESCRIPTION

svn-bisect helps to automate finding a bug or behavior change in a Subversion working
copy. Given an initial “good” revision, with the desired or original behavior, and a
newer “bad” revision, with the undesired or modified behavior, svn-bisect will do a binary
search through the revision range to find which revision caused the change.

svn-bisect must be initialized in a working copy, with svn-bisect start. It also needs to
be given at least one good revision (the baseline) and one bad revision (known modified
behavior) revision.

Sub-commands:

start Initializes or reinitializes svn-bisect; optionally takes good and bad revision
parameters.

good rev

bad rev
Tells svn-bisect that a revision is good or bad, defining or narrowing the search
space. If not specified, revision defaults to the current revision in the working
copy. svn-bisect will then update to a revision halfway between the new good and
bad boundaries. If this update crosses a point where a branch was created, it
switches in or out of the branch.

reset Resets the working copy to the revision and branch where svn-bisect start was run.
In the simple case this is equivalent to rm -r .svn-bisect; svn update, but not if
it has crossed branches, and not if you did not start at the HEAD revision. In any
case, svn-bisect never keeps track of mixed-revision working copies, so do not use
svn-bisect in a working copy that will need to be restored to mixed revisions.

status Prints a brief status message.

run command
Runs the bisection in a loop. You must have already defined initial good and bad
boundary conditions. Each iteration through the loop runs command as a shell
command (a single argument, quoted if necessary) on the chosen revision, then marks
the revision as good or bad, based on the exit status of command.

EXAMPLES

Assume you are trying to find which revision between 1250 and 1400 caused the make check
command to fail.

svn-bisect start 1250 1400
svn-bisect run 'make check'
svn-bisect reset

ENVIRONMENT

SVN The Subversion command-line program to call (default svn).

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