diff options
Diffstat (limited to 'Debian/Dgit.pm')
| -rw-r--r-- | Debian/Dgit.pm | 199 |
1 files changed, 194 insertions, 5 deletions
diff --git a/Debian/Dgit.pm b/Debian/Dgit.pm index dcecbd1..c4a61af 100644 --- a/Debian/Dgit.pm +++ b/Debian/Dgit.pm @@ -29,6 +29,8 @@ use Config; use Digest::SHA; use Data::Dumper; use IPC::Open2; +use File::Path; +use File::Basename; BEGIN { use Exporter (); @@ -42,10 +44,10 @@ BEGIN { server_branch server_ref stat_exists link_ltarget hashfile - fail ensuredir executable_on_path + fail ensuredir must_getcwd executable_on_path waitstatusmsg failedcmd_waitstatus failedcmd_report_cmd failedcmd - cmdoutput cmdoutput_errok + runcmd cmdoutput cmdoutput_errok git_rev_parse git_cat_file git_get_ref git_for_each_ref git_for_each_tag_referring is_fast_fwd @@ -55,10 +57,18 @@ BEGIN { initdebug enabledebug enabledebuglevel printdebug debugcmd $debugprefix *debuglevel *DEBUG - shellquote printcmd messagequote); + shellquote printcmd messagequote + $negate_harmful_gitattrs + changedir git_slurp_config_src + playtree_setup); # implicitly uses $main::us - %EXPORT_TAGS = ( policyflags => [qw(NOFFCHECK FRESHREPO NOCOMMITCHECK)] ); - @EXPORT_OK = @{ $EXPORT_TAGS{policyflags} }; + %EXPORT_TAGS = ( policyflags => [qw(NOFFCHECK FRESHREPO NOCOMMITCHECK)], + playground => [qw(record_maindir $maindir $local_git_cfg + $maindir_gitdir $maindir_gitcommon + fresh_playground $playground + ensure_a_playground)]); + @EXPORT_OK = ( @{ $EXPORT_TAGS{policyflags} }, + @{ $EXPORT_TAGS{playground} } ); } our @EXPORT_OK; @@ -82,6 +92,8 @@ sub NOCOMMITCHECK () { return 0x8; } our $debugprefix; our $debuglevel = 0; +our $negate_harmful_gitattrs = "-text -eol -crlf -ident -filter"; + our $forkcheck_mainprocess; sub forkcheck_setup () { @@ -216,6 +228,12 @@ sub ensuredir ($) { die "mkdir $dir: $!"; } +sub must_getcwd () { + my $d = getcwd(); + defined $d or fail "getcwd failed: $!"; + return $d; +} + sub executable_on_path ($) { my ($program) = @_; return 1 if $program =~ m{/}; @@ -276,6 +294,12 @@ sub failedcmd { fail failedcmd_waitstatus(); } +sub runcmd { + debugcmd "+",@_; + $!=0; $?=-1; + failedcmd @_ if system @_; +} + sub cmdoutput_errok { confess Dumper(\@_)." ?" if grep { !defined } @_; debugcmd "|",@_; @@ -406,4 +430,169 @@ sub is_fast_fwd ($$) { } } +sub changedir ($) { + my ($newdir) = @_; + printdebug "CD $newdir\n"; + chdir $newdir or confess "chdir: $newdir: $!"; +} + +sub git_slurp_config_src ($) { + my ($src) = @_; + # returns $r such that $r->{KEY}[] = VALUE + my @cmd = (qw(git config -z --get-regexp), "--$src", qw(.*)); + debugcmd "|",@cmd; + + local ($debuglevel) = $debuglevel-2; + local $/="\0"; + + my $r = { }; + open GITS, "-|", @cmd or die $!; + while (<GITS>) { + chomp or die; + printdebug "=> ", (messagequote $_), "\n"; + m/\n/ or die "$_ ?"; + push @{ $r->{$`} }, $'; #'; + } + $!=0; $?=0; + close GITS + or ($!==0 && $?==256) + or failedcmd @cmd; + return $r; +} + +# ========== playground handling ========== + +# terminology: +# +# $maindir user's git working tree +# $playground area in .git/ where we can make files, unpack, etc. etc. +# playtree git working tree sharing object store with the user's +# inside playground, or identical to it +# +# other globals +# +# $local_git_cfg hash of arrays of values: git config from $maindir +# +# expected calling pattern +# +# firstly +# +# [record_maindir] +# must be run in directory containing .git +# assigns to $maindir if not already set +# also calls git_slurp_config_src to record git config +# in $local_git_cfg, unless it's already set +# +# fresh_playground SUBDIR_PATH_COMPONENTS +# e.g fresh_playground 'dgit/unpack' ('.git/' is implied) +# default SUBDIR_PATH_COMPONENTS is $playground_subdir +# calls record_maindir +# sets up a new playground (destroying any old one) +# assigns to $playground and returns the same pathname +# caller may call multiple times with different subdir paths +# createing different playgrounds; but $playground global can +# refer only to one, obv. +# +# ensure_a_playground SUBDIR_PATH_COMPONENTS +# like fresh_playground except: +# merely ensures the directory exists; does not delete an existing one +# never sets global $playground +# +# then can use +# +# changedir $playground +# changedir $maindir +# +# playtree_setup $local_git_cfg +# # ^ call in some (perhaps trivial) subdir of $playground +# +# rmtree $playground + +# ----- maindir ----- + +# these three all go together +our $maindir; +our $maindir_gitdir; +our $maindir_gitcommon; + +our $local_git_cfg; + +sub record_maindir () { + if (!defined $maindir) { + $maindir = must_getcwd(); + if (!stat "$maindir/.git") { + fail "cannot stat $maindir/.git: $!"; + } + if (-d _) { + # we fall back to this in case we have a pre-worktree + # git, which may not know git rev-parse --git-common-dir + $maindir_gitdir = "$maindir/.git"; + $maindir_gitcommon = "$maindir/.git"; + } else { + $maindir_gitdir = cmdoutput qw(git rev-parse --git-dir); + $maindir_gitcommon = cmdoutput qw(git rev-parse --git-common-dir); + } + } + $local_git_cfg //= git_slurp_config_src 'local'; +} + +# ----- playgrounds ----- + +our $playground; + +sub ensure_a_playground_parent ($) { + my ($spc) = @_; + record_maindir(); + $spc = "$maindir_gitdir/$spc"; + my $parent = dirname $spc; + mkdir $parent or $!==EEXIST + or fail "failed to mkdir playground parent $parent: $!"; + return $spc; +} + +sub ensure_a_playground ($) { + my ($spc) = @_; + $spc = ensure_a_playground_parent $spc; + mkdir $spc or $!==EEXIST or fail "failed to mkdir a playground $spc: $!"; + return $spc; +} + +sub fresh_playground ($) { + my ($spc) = @_; + $spc = ensure_a_playground_parent $spc; + rmtree $spc; + mkdir $spc or fail "failed to mkdir the playground $spc: $!"; + return $playground = $spc; +} + +# ----- playtrees ----- + +sub playtree_setup (;$) { + my ($t_local_git_cfg) = @_; + $t_local_git_cfg //= $local_git_cfg; + # for use in the playtree + # $maindir must be set, eg by calling record_maindir or fresh_playground + runcmd qw(git init -q); + runcmd qw(git config gc.auto 0); + foreach my $copy (qw(user.email user.name user.useConfigOnly + core.sharedRepository + core.compression core.looseCompression + core.bigFileThreshold core.fsyncObjectFiles)) { + my $v = $t_local_git_cfg->{$copy}; + next unless $v; + runcmd qw(git config), $copy, $_ foreach @$v; + } + # this is confusing: we have + # . playtree, not a worktree, has .git/, our cwd + # $maindir might be a worktree so + # $maindir_gitdir contains our main working "dgit", HEAD, etc. + # $maindir_gitcommon the shared stuff, including .objects + rmtree('.git/objects'); + symlink "$maindir_gitcommon/objects",'.git/objects' or die $!; + ensuredir '.git/info'; + open GA, "> .git/info/attributes" or die $!; + print GA "* $negate_harmful_gitattrs\n" or die $!; + close GA or die $!; +} + 1; |