gitolite/src/hooks/update

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#!/usr/bin/perl
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use strict;
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use warnings;
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# === update ===
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# this is gitolite's update hook
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# part of the gitolite (GL) suite
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# how run: via git, being copied as .git/hooks/update in every repo
# when: every push
# input:
# - see man githooks for STDIN
# - uses the compiled config file to get permissions info
# output: based on permissions etc., exit 0 or 1
# security:
# - none
# robustness:
# other notes:
# ----------------------------------------------------------------------------
# common definitions
# ----------------------------------------------------------------------------
our ($GL_CONF_COMPILED, $PERSONAL);
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our %repos;
# we should already have the GL_RC env var set when we enter this hook
die "parse $ENV{GL_RC} failed: " . ($! or $@) unless do $ENV{GL_RC};
# then "do" the compiled config file, whose name we now know
die "parse $GL_CONF_COMPILED failed: " . ($! or $@) unless do $GL_CONF_COMPILED;
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# ----------------------------------------------------------------------------
# start...
# ----------------------------------------------------------------------------
my $ref = shift;
my $oldsha = shift;
my $newsha = shift;
my $merge_base = '0' x 40;
# compute a merge-base if both SHAs are non-0, else leave it as '0'x40
# (i.e., for branch create or delete, merge_base == '0'x40)
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chomp($merge_base = `git merge-base $oldsha $newsha`)
unless $oldsha eq '0' x 40
or $newsha eq '0' x 40;
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# some of this is from an example hook in Documentation/howto of git.git, with
# some variations
# what are you trying to do? (is it 'W' or '+'?)
my $perm = 'W';
# rewriting a tag is considered a rewind, in terms of permissions
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$perm = '+' if $ref =~ m(refs/tags/) and $oldsha ne ('0' x 40);
# non-ff push to ref
# notice that ref delete looks like a rewind, as it should
$perm = '+' if $oldsha ne $merge_base;
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my @allowed_refs;
# personal stuff -- right at the start in the new regime, I guess!
push @allowed_refs, { "$PERSONAL/$ENV{GL_USER}/" => "RW+" } if $PERSONAL;
# we want specific perms to override @all, so they come first
push @allowed_refs, @ { $repos{$ENV{GL_REPO}}{$ENV{GL_USER}} || [] };
push @allowed_refs, @ { $repos{$ENV{GL_REPO}}{'@all'} || [] };
for my $ar (@allowed_refs)
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{
my $refex = (keys %$ar)[0];
# refex? sure -- a regex to match a ref against :)
next unless $ref =~ /$refex/;
if ($ar->{$refex} =~ /\Q$perm/)
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{
# if log failure isn't important enough to block pushes, get rid of
# all the error checking
open my $log_fh, ">>", $ENV{GL_LOG}
or die "open log failed: $!\n";
print $log_fh "$ENV{GL_TS} $perm\t" .
substr($oldsha, 0, 14) . "\t" . substr($newsha, 0, 14) .
"\t$ENV{GL_REPO}\t$ref\t$ENV{GL_USER}\t$refex\n";
close $log_fh or die "close log failed: $!\n";
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exit 0;
}
}
die "$perm $ref $ENV{GL_REPO} $ENV{GL_USER} DENIED by fallthru\n";