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Diffstat (limited to 'tools/git2svn.pl')
| -rwxr-xr-x | tools/git2svn.pl | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/tools/git2svn.pl b/tools/git2svn.pl new file mode 100755 index 00000000..c90ea96e --- /dev/null +++ b/tools/git2svn.pl @@ -0,0 +1,129 @@ +#!/usr/bin/perl +# +# This script pulls the current branch, then walks the first parents and +# commit each of them into subversion. +# +# Copyright (C) 2008 Thomas Guyot-Sionnest <dermoth@aei.ca> +# +# The subversion repository must not be taking any external commit or this +# script will erase them. This script cannot run off a bare repository. +# +# *** INITIAL SETUP *** +# +# 1. Run this command line to get the repository up and ready for this script: +# +# $ cd /path/to/repo/; git log -1 --pretty=format:%H >.git/git2svn.last_commit_hash +# +# 2. Configure the lines below... $ENV{'GIT_DIR'} must point to the .git +# directory of the git-svn repo. +# +# *** INITIAL SETUP *** +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. + +use strict; +use warnings; + +# This is the git working tree. Must be tied to a SVN repository +$ENV{'GIT_DIR'} = '/path/to/nagiosplug/.git'; + +# For some strange reasons this is needed: +$ENV{'GIT_SVN_ID'} = 'trunk'; + +# Path to git binary +my $git = '/usr/bin/git'; + +# Force commits from the hash stored in git2svn.last_commit_hash regardless +# of the state of the current repository. Use this if the repository was +# updated manually or if you need to set that hash to a specific value. +# NB: Re-committing old hashes will revert then roll again changes to SVN. +my $FORCE = 0; + +# Print debug output. Useful if you want to see what's being committed. +my $DEBUG = 0; + +for (@ARGV) { + $FORCE = 1 if (m/force/); + $DEBUG = 1 if (m/debug/); + if (m/help/ || m/--help/ || m/-h/) { + print "Usage: $0 [ debug ] [ force ] [ help ]\n"; + exit 0; + } +} + +# 1st get the current commit hash - we'll start committing to SVN from this one +print "Reading saved hash from $ENV{'GIT_DIR'}/git2svn.last_commit_hash\n" if ($DEBUG); +open(SAVHASH, "<$ENV{'GIT_DIR'}/git2svn.last_commit_hash") + or die("Can't open $ENV{'GIT_DIR'}/git2svn.last_commit_hash: $!"); +my $saved_commit_hash = <SAVHASH>; +chomp $saved_commit_hash; +print "Saved commit hash: $saved_commit_hash\n" if ($DEBUG); +close(SAVHASH); + +my $last_commit_hash; +if ($FORCE) { + $last_commit_hash = $saved_commit_hash; + print "Forcing last commit hash to $last_commit_hash\n" if ($DEBUG); +} else { + print "Running: $git log -1 --pretty=format:%H\n" if ($DEBUG); + $last_commit_hash = `$git log -1 --pretty=format:%H`; + die("Failed to retrieve last commit hash") if ($?); + chomp $last_commit_hash; + print "Last commit hash: $last_commit_hash\n" if ($DEBUG); + + # Sanity check + die("Last commit hash and saved commit hash don't match, aborting") + if ($last_commit_hash ne $saved_commit_hash); +} + +# 2nd pull the remote tree +print "Running: $git pull\n" if ($DEBUG); +`$git pull`; +die("Failed to pull") if ($?); + +# Then list all first parents since the last one and insert them into an array +my @commits; +print "Running: $git rev-list --first-parent $last_commit_hash..HEAD\n" if ($DEBUG); +open(REVLIST, "$git rev-list --first-parent $last_commit_hash..HEAD|") + or die("Failed to retrieve revision list: $!"); + +while (<REVLIST>) { + chomp; + unshift @commits, $_; + print "Prepending the list with $_\n" if ($DEBUG); +} + +close(REVLIST); + +if (@commits == 0) { + print "Nothing to do.\n"; + exit 0; +} + +# Finally, commit every revision found into SVN +foreach my $commit (@commits) { + print "Commiting $commit to Subversion\n"; + print "Running: $git svn set-tree $commit\n" if ($DEBUG); + `$git svn set-tree $commit`; + die("Failed to commit hash $commit") if ($?); +} + +# Once done, update the last commit hash +$last_commit_hash = pop @commits; +print "Writing last commit hash to $ENV{'GIT_DIR'}/git2svn.last_commit_hash\n" if ($DEBUG); +open(SAVHASH, ">$ENV{'GIT_DIR'}/git2svn.last_commit_hash") + or die("Can't open $ENV{'GIT_DIR'}/git2svn.last_commit_hash for writing: $!"); +print SAVHASH $last_commit_hash; +close(SAVHASH); + |