shlib.sh

   1 #!/bin/sh
   2 #
   3 # This is generic shell library for all the scripts used by Girocco;
   4 # most importantly, it introduces all the $cfg_* shell variables.
   5
   6 # SHA-1 patterns
   7 octet='[0-9a-f][0-9a-f]'
   8 octet4="$octet$octet$octet$octet"
   9 octet19="$octet4$octet4$octet4$octet4$octet$octet$octet"
  10 octet20="$octet4$octet4$octet4$octet4$octet4"
  11 nullsha="0000000000000000000000000000000000000000"
  12 # tab
  13 tab="$(printf '\t')"
  14
  15 # set a sane umask that never excludes any user or group permissions
  16 umask $(printf '0%03o' $(( $(umask) & ~0770 )) )
  17
  18 vcmp() {
  19         # Compare $1 to $2 each of which must match \d+(\.\d+)*
  20         # An empty string ('') for $1 or $2 is treated like 0
  21         # Outputs:
  22         #  -1 if $1 < $2
  23         #   0 if $1 = $2
  24         #   1 if $1 > $2
  25         # Note that `vcmp 1.8 1.8.0.0.0.0` correctly outputs 0.
  26         while
  27                 _a="${1%%.*}"
  28                 _b="${2%%.*}"
  29                 [ -n "$_a" -o -n "$_b" ]
  30         do
  31                 if [ "${_a:-0}" -lt "${_b:-0}" ]; then
  32                         echo -1
  33                         return
  34                 elif [ "${_a:-0}" -gt "${_b:-0}" ]; then
  35                         echo 1
  36                         return
  37                 fi
  38                 _a2="${1#$_a}"
  39                 _b2="${2#$_b}"
  40                 set -- "${_a2#.}" "${_b2#.}"
  41         done
  42         echo 0
  43 }
  44
  45 get_girocco_config_pm_var_list() {
  46         # Export all the variables from Girocco::Config to suitable var= lines
  47         # prefixing them with 'cfg_'. E.g. $cfg_admin is admin's mail address now
  48         # and also setting a 'defined_cfg_' prefix to 1 if they are not undef.
  49         __girocco_conf="$GIROCCO_CONF"
  50         [ -n "$__girocco_conf" ] || __girocco_conf="Girocco::Config"
  51         [ -z "$basedir" ] || __girocco_extrainc="-I$basedir"
  52         perl -I@basedir@ $__girocco_extrainc -M$__girocco_conf -le \
  53                 'foreach (sort {uc($a) cmp uc($b)} keys %Girocco::Config::) {
  54                         my $val = ${$Girocco::Config::{$_}}; defined($val) or $val="";
  55                         $val =~ s/([\\"\$\`])/\\$1/gos;
  56                         $val =~ s/(?:\r\n|\r|\n)$//os;
  57                         print "cfg_$_=\"$val\"";
  58                         print "defined_cfg_$_=",
  59                                 (defined(${$Girocco::Config::{$_}})?"1":"");
  60                 }'
  61 }
  62
  63 get_girocco_config_var_list() (
  64         # Same as get_girocco_config_pm_var_list except that
  65         # the following variables (all starting with var_) are added:
  66         # var_group             cfg_owning_group if defined otherwise `id -gn`
  67         # var_git_ver           The version number part from `git version`
  68         # var_git_exec_path     The result of $cfg_git_bin --exec-dir
  69         # var_perl_bin          Full path to the perl interpreter to use
  70         # var_have_git_172      Set to 1 if git version >= 1.7.2 otherwise ''
  71         # var_have_git_173      Set to 1 if git version >= 1.7.3 otherwise ''
  72         # var_window_memory     Value to use for repack --window-memory=
  73         # var_big_file_threshold Value to use for core.bigFileThreshold
  74         # var_log_window_size   Value to use for git-svn --log-window-size=
  75         # var_utf8_locale       Value to use for a UTF-8 locale if available
  76         # var_xargs_r           A "-r" if xargs needs it to behave correctly
  77         # var_du_exclude        Option to exclude PATTERN from du if available
  78         # var_du_follow         Option to follow command line sym links if available
  79         _cfg_vars="$(get_girocco_config_pm_var_list)"
  80         eval "$_cfg_vars"
  81         printf '%s\n' "$_cfg_vars"
  82         printf 'var_group=%s\n' "${cfg_owning_group:-$(id -gn)}"
  83         _gver="$("$cfg_git_bin" version 2>/dev/null | \
  84                 sed -ne 's/^[^0-9]*\([0-9][0-9]*\(\.[0-9][0-9]*\)*\).*$/\1/p')"
  85         printf 'var_git_ver=%s\n' "$_gver"
  86         printf 'var_git_exec_path="%s"\n' "$("$cfg_git_bin" --exec-path 2>/dev/null)"
  87         printf 'var_perl_bin="%s"\n' "${cfg_perl_bin:-$(unset -f perl; command -v perl)}"
  88         printf 'var_have_git_172=%s\n' "$([ $(vcmp "$_gver" 1.7.2) -ge 0 ] && echo 1)"
  89         printf 'var_have_git_173=%s\n' "$([ $(vcmp "$_gver" 1.7.3) -ge 0 ] && echo 1)"
  90         __girocco_conf="$GIROCCO_CONF"
  91         [ -n "$__girocco_conf" ] || __girocco_conf="Girocco::Config"
  92         [ -z "$basedir" ] || __girocco_extrainc="-I$basedir"
  93         printf "var_window_memory=%s\n" \
  94                 "$(perl -I@basedir@ $__girocco_extrainc -M$__girocco_conf \
  95                 -MGirocco::Util -e 'print calc_windowmemory')"
  96         printf "var_big_file_threshold=%s\n" \
  97                 "$(perl -I@basedir@ $__girocco_extrainc -M$__girocco_conf \
  98                 -MGirocco::Util -e 'print calc_bigfilethreshold')"
  99         printf 'var_log_window_size=%s\n' "${cfg_svn_log_window_size:-250}"
 100         # We parse the output of `locale -a` and select a suitable UTF-8 locale.
 101         _guess_locale="$(locale -a | grep -viE '^(posix|c)(\..*)?$' | \
 102                 grep -iE '\.utf-?8$' | sed -e 's/\.[Uu][Tt][Ff]-*8$//' | \
 103                 sed -e '/en_US/ s/^/0 /; /en_US/ !s/^/1 /' | LC_ALL=C sort | \
 104                 head -n 1 | cut -d ' ' -f 2)"
 105         [ -z "$_guess_locale" ] || printf 'var_utf8_locale=%s.UTF-8\n' "$_guess_locale"
 106         # On some broken platforms running xargs without -r and empty input runs the command
 107         printf 'var_xargs_r=%s\n' "$(: | command xargs echo -r)"
 108         # The disk usage report produces better numbers if du has an exclude option
 109         _x0="$(basename "$0")"
 110         _x0="${_x0%?}?*"
 111         for _duopt in --exclude -I; do
 112                 if _test="$(du $_duopt 's?lib.s*' $_duopt "$_x0" "$0" 2>/dev/null)" && [ -z "$_test" ]; then
 113                         printf 'var_du_exclude=%s\n' "$_duopt"
 114                         break
 115                 fi
 116         done
 117         if _test="$(du -H "$0" 2>/dev/null)" && [ -n "$_test" ]; then
 118                 printf 'var_du_follow=%s\n' "-H"
 119                 break
 120         fi
 121 )
 122
 123 # If basedir has been replaced, and shlib_vars.sh exists, get the config
 124 # definitions from it rather than running Perl.
 125 if [ "@basedir@" = '@'basedir'@' ] || ! [ -r "@basedir@/shlib_vars.sh" ]; then
 126         # Import all the variables from Girocco::Config to the local environment,
 127         eval "$(get_girocco_config_var_list)"
 128 else
 129         # Import the variables from shlib_vars.sh which avoids needlessly
 130         # running another copy of Perl
 131         . "@basedir@/shlib_vars.sh"
 132 fi
 133
 134 # git_add_config "some.var=value"
 135 # every ' in value must be replaced with the 4-character sequence '\'' before
 136 # calling this function or Git will barf.  Will not be effective unless running
 137 # Git version 1.7.3 or later.
 138 git_add_config() {
 139         GIT_CONFIG_PARAMETERS="${GIT_CONFIG_PARAMETERS:+$GIT_CONFIG_PARAMETERS }'$1'"
 140         export GIT_CONFIG_PARAMETERS
 141 }
 142
 143 # Make sure we have a reproducible environment by using a controlled HOME dir
 144 XDG_CONFIG_HOME="$cfg_chroot/var/empty"
 145 HOME="$cfg_chroot/etc/girocco"
 146 GIT_CONFIG_NOSYSTEM=1
 147 GIT_ATTR_NOSYSTEM=1
 148 GIT_NO_REPLACE_OBJECTS=1
 149 GIT_TERMINAL_PROMPT=0
 150 GIT_ASKPASS="$cfg_basedir/bin/git-askpass-password"
 151 export XDG_CONFIG_HOME
 152 export HOME
 153 export GIT_CONFIG_NOSYSTEM
 154 export GIT_ATTR_NOSYSTEM
 155 export GIT_NO_REPLACE_OBJECTS
 156 export GIT_TERMINAL_PROMPT
 157 export GIT_ASKPASS
 158 unset GIT_USER_AGENT
 159 unset GIT_HTTP_USER_AGENT
 160 if [ -n "$defined_cfg_git_client_ua" ]; then
 161         GIT_USER_AGENT="$cfg_git_client_ua"
 162         export GIT_USER_AGENT
 163         GIT_HTTP_USER_AGENT="$cfg_git_client_ua"
 164         export GIT_HTTP_USER_AGENT
 165 fi
 166 unset GIT_CONFIG_PARAMETERS
 167 [ -z "$var_big_file_threshold" ] ||
 168         git_add_config "core.bigFileThreshold=$var_big_file_threshold"
 169
 170 # We cannot use a git() {} or nc_openbsd() {} function to redirect git
 171 # and nc_openbsd to the desired executables because when using
 172 # "ENV_VAR=xxx func" the various /bin/sh implementations behave in various
 173 # different and unexpected ways:
 174 #   a) treat "ENV_VAR=xxx" like a separate, preceding "export ENV_VAR=xxx"
 175 #   b) treat "ENV_VAR=xxx" like a separate, prededing "ENV_VAR=xxx"
 176 #   c) treat "ENV_VAR=xxx" like a temporary setting only while running func
 177 # None of these are good.  We want a temporary "export ENV_VAR=xxx"
 178 # setting only while running func which none of the /bin/sh's do.
 179 #
 180 # Instead we'd like to use an alias that provides the desired behavior without
 181 # any of the bad (a), (b) or (c) effects.
 182 #
 183 # However, unfortunately, some of the crazy /bin/sh implementations do not
 184 # recognize alias expansions when preceded by variable assignments!
 185 #
 186 # So we are left with git() {} and nc_openbsd() {} functions and in the
 187 # case of git() {} we can compensate for (b) and (c) failing to export
 188 # but not (a) and (b) persisting the values so the caller will simply
 189 # have to beware and explicitly unset any variables that should not persist
 190 # beyond the function call itself.
 191
 192 git() (
 193         [ "${GIT_DIR+set}" = "set" ] && export GIT_DIR
 194         [ "${GIT_SSL_NO_VERIFY+set}" = "set" ] && export GIT_SSL_NO_VERIFY
 195         [ "${GIT_TRACE_PACKET+set}" = "set" ] && export GIT_TRACE_PACKET
 196         [ "${GIT_USER_AGENT+set}" = "set" ] && export GIT_USER_AGENT
 197         [ "${GIT_HTTP_USER_AGENT+set}" = "set" ] && export GIT_HTTP_USER_AGENT
 198         exec "$cfg_git_bin" "$@"
 199 )
 200
 201 # see comments for git() -- callers must explicitly export all variables
 202 # intended for the perl interpreter before using this function
 203 perl() { command "${var_perl_bin:-perl}" "$@"; }
 204
 205 nc_openbsd() { "$cfg_nc_openbsd_bin" "$@"; }
 206
 207 # Some platforms' broken xargs runs the command always at least once even if
 208 # there's no input unless given a special option.  Automatically supply the
 209 # option on those platforms by providing an xargs function.
 210 xargs() { command xargs $var_xargs_r "$@"; }
 211
 212 _addrlist() {
 213         _list=
 214         for _addr in "$@"; do
 215                 [ -z "$_list" ] || _list="$_list, "
 216                 _list="$_list$_addr"
 217         done
 218         echo "$_list"
 219 }
 220
 221 _sendmail() {
 222         _mailer="${cfg_sendmail_bin:-/usr/sbin/sendmail}"
 223         if [ -n "$cfg_sender" ]; then
 224                 "$_mailer" -i -f "$cfg_sender" "$@"
 225         else
 226                 "$_mailer" -i "$@"
 227         fi
 228 }
 229
 230 mail() {
 231         _subject=
 232         if [ "$1" = "-s" ]; then
 233                 shift
 234                 _subject="$1"
 235                 shift
 236         fi
 237         {
 238                 echo "From: \"$cfg_name\" ($cfg_title) <$cfg_admin>"
 239                 echo "To: $(_addrlist "$@")"
 240                 [ -z "$_subject" ] || echo "Subject: $_subject"
 241                 echo "MIME-Version: 1.0"
 242                 echo "Content-Type: text/plain; charset=utf-8"
 243                 echo "Content-Transfer-Encoding: 8bit"
 244                 echo "Auto-Submitted: auto-generated"
 245                 echo ""
 246                 cat
 247         } | _sendmail "$@"
 248 }
 249
 250 # bang CMD... will execute the command with well-defined failure mode;
 251 # set bang_action to string of the failed action ('clone', 'update', ...);
 252 # pre-set bang_once=1 to make sure jobs banging on a repo repeatedly will
 253 # not spam the owner; re-define the bang_trap() function to do custom
 254 # cleanup before bailing out
 255 bang() {
 256         if [ -n "$show_progress" ]; then
 257                 exec 3>&1
 258                 errcode=
 259                 read -r errcode <<-EOT || :
 260                 $(
 261                         exec 4>&3 3>&1 1>&4 4>&-
 262                         { "$@" 3>&- || echo $? >&3; } 2>&1 | tee -a "$bang_log"
 263                 )
 264                 EOT
 265                 exec 3>&-
 266                 if [ -z "$errcode" ]; then
 267                         # All right. Cool.
 268                         return;
 269                 fi
 270         else
 271                 if "$@" >>"$bang_log" 2>&1; then
 272                         # All right. Cool.
 273                         return;
 274                 else
 275                         errcode="$?"
 276                 fi
 277         fi
 278         if ! [ -e .banged ] || [ -e .bangagain ]; then
 279                 rm -f .bangagain
 280                 bangmailok=true
 281                 ! [ -f HEAD -a -f config -a -d objects ] ||
 282                 bangmailok="$(GIT_DIR=. git config --bool gitweb.statusupdates 2>/dev/null || echo true)"
 283                 bangaddrs=''
 284                 [ "$bangmailok" = "false" -o -z "$mail" ] || bangaddrs="$mail"
 285                 [ -z "$cfg_admincc" -o "$cfg_admincc" = "0" -o -z "$cfg_admin" ] ||
 286                 if [ -z "$bangaddrs" ]; then bangaddrs="$cfg_admin"; else bangaddrs="$bangaddrs,$cfg_admin"; fi
 287                 [ -z "$bangaddrs" ] ||
 288                 {
 289                         echo "$* failed with error code $errcode"
 290                         echo ""
 291                         [ ! -n "$bang_once" ] || echo "you will not receive any more notifications until recovery"
 292                         echo "this status message may be disabled on the project admin page"
 293                         echo ""
 294                         echo "Log follows:"
 295                         echo ""
 296                         cat "$bang_log"
 297                 } | mail -s "[$cfg_name] $proj $bang_action failed" "$bangaddrs"
 298         fi
 299         touch .banged
 300         cat "$bang_log" > .banglog
 301         bang_trap
 302         exit 1
 303 }
 304
 305 # bang_eval CMD... will evaluate the command with well-defined failure mode;
 306 # Identical to bang CMD... except the command is eval'd instead of executed.
 307 bang_eval() {
 308         bang eval "$*"
 309 }
 310
 311 # Default bang settings:
 312 bang_setup() {
 313         bang_action="lame_programmer"
 314         bang_once=
 315         bang_trap() { :; }
 316         bang_log="$(mktemp -t repomgr-XXXXXX)"
 317         trap 'rm -f "$bang_log"' EXIT
 318         trap 'exit 130' INT
 319         trap 'exit 143' TERM
 320 }
 321
 322 # Remove banged status
 323 bang_reset() {
 324         rm -f .banged .bangagain .banglog
 325 }
 326
 327 # Check to see if banged status
 328 is_banged() {
 329         [ -e .banged ]
 330 }
 331
 332
 333 # Progress report - if show_progress is set, shows the given message.
 334 progress() {
 335         [ ! -n "$show_progress" ] || echo "$@"
 336 }
 337
 338
 339 # Project config accessors; must be run in project directory
 340 config_get() {
 341         git config "gitweb.$1"
 342 }
 343
 344 config_set() {
 345         git config "gitweb.$1" "$2" && chgrp $var_group config && chmod g+w config
 346 }
 347
 348 config_set_raw() {
 349         git config "$1" "$2"        && chgrp $var_group config && chmod g+w config
 350 }
 351
 352 config_get_date_seconds() {
 353         _dt="$(config_get "$1" || :)"
 354         [ -n "$_dt" ] || return 1
 355         _ds="$(perl -I@basedir@ -MGirocco::Util -e "print parse_rfc2822_date('$_dt')")"
 356         [ -n "$_ds" ] || return 1
 357         echo "$_ds"
 358 }
 359
 360 # Tool for checking whether given number of seconds has not passed yet
 361 check_interval() {
 362         os="$(config_get_date_seconds "$1")" || return 1
 363         ns="$(date +%s)"
 364         [ $ns -lt $(($os+$2)) ]
 365 }
 366
 367 # Check if we are running with effective root permissions
 368 is_root() {
 369         [ "$(id -u 2>/dev/null)" = "0" ]
 370 }
 371
 372 # Check to see if the single argument is a Git directory
 373 is_git_dir() {
 374         # Just like Git's test except we ignore GIT_OBJECT_DIRECTORY
 375         # And we are slightly more picky (must be refs/.+ not refs/.*)
 376         [ -d "$1/objects" -a -x "$1/objects" ] || return 1
 377         [ -d "$1/refs" -a -x "$1/refs" ] || return 1
 378         if [ -L "$1/HEAD" ]; then
 379                 _hr="$(readlink "$1/HEAD")"
 380                 case "$_hr" in "refs/"?*) :;; *) return 1;; esac
 381         fi
 382         [ -f "$1/HEAD" -a -r "$1/HEAD" ] || return 1
 383         read -r _hr <"$1/HEAD" || return 1
 384         case "$_hr" in
 385                 $octet20)
 386                         return 0;;
 387                 ref:*)
 388                         _hr="${_hr##ref:*[ $tab]}"
 389                         case "$_hr" in "refs/"?*) return 0;; esac
 390         esac
 391         return 1
 392 }
 393
 394 # List all Git repositories, with given prefix if specified, one-per-line
 395 # All project names starting with _ are always excluded from the result
 396 get_repo_list() {
 397         if [ -n "$1" ]; then
 398                 cut -d : -f 1,3 "$cfg_chroot"/etc/group | grep "^$1"
 399         else
 400                 cut -d : -f 1,3 "$cfg_chroot"/etc/group
 401         fi | while IFS=: read name id; do
 402                 [ $id -lt 65536 ] || case "$name" in _*) :;; ?*) echo "$name"; esac
 403         done
 404 }
 405
 406 # returns empty string for non-mirrors, otherwise one of:
 407 #   m  =>  normal Git mirror
 408 #   s  =>  mirror from svn source
 409 #   d  =>  mirror from darcs source
 410 #   b  =>  mirror from bzr source
 411 #   h  =>  mirror from hg source
 412 # the optional passed in git dir defaults to "."
 413 # will fail if the directory does not have .nofetch and gitweb.baseurl
 414 # comes back empty
 415 get_mirror_type() {
 416         _gitdir="${1:-.}"
 417         # always return empty for non-mirrors
 418         [ ! -e "$_gitdir/.nofetch" ] || return 0
 419         _url="$(GIT_DIR="$_gitdir" config_get baseurl 2>/dev/null || :)"
 420         _url="${_url##* }"
 421         case "$_url" in
 422                 "")
 423                         return 1
 424                         ;;
 425                 svn://* | svn+http://* | svn+https://*)
 426                         echo 's'
 427                         ;;
 428                 darcs://*)
 429                         echo 'd'
 430                         ;;
 431                 bzr://*)
 432                         echo 'b'
 433                         ;;
 434                 hg+http://* | hg+https://*)
 435                         echo 'h'
 436                         ;;
 437                 *)
 438                         echo 'm'
 439                         ;;
 440         esac
 441         return 0
 442 }
 443
 444 # returns true if the passed in git dir (defaults to ".") is a mirror using git fast-import
 445 is_gfi_mirror() {
 446         case "$(get_mirror_type "$1" 2>/dev/null || :)" in
 447                 d|b|h)
 448                         # darcs, bzr and hg mirrors use git fast-import
 449                         return 0
 450                         ;;
 451                 *)
 452                         # Don't think git-svn currently uses git fast-import
 453                         # And Git mirrors certainly do not
 454                         return 1
 455                         ;;
 456         esac
 457         # assume it does not use git fast-import
 458         return 1
 459 }
 460
 461 # returns true if the passed in git dir (defaults to ".") is a mirror using git-svn
 462 is_svn_mirror() {
 463         [ "$(get_mirror_type "$1" 2>/dev/null || :)" = "s" ]
 464 }
 465
 466 # A well-known UTF-8 locale is required for some of the fast-import providers
 467 # in order to avoid mangling characters.  Ideally we could use "POSIX.UTF-8"
 468 # but that is not reliably UTF-8 but rather usually US-ASCII.
 469 # We parse the output of `locale -a` and select a suitable UTF-8 locale at
 470 # install time and store that in $var_utf8_locale if one is found.
 471 # If we cannot find one in the `locale -a` output then we just use a well-known
 472 # UTF-8 locale and hope for the best.  We set LC_ALL to our choice and export
 473 # it.  We only set this temporarily when running the fast-import providers.
 474 set_utf8_locale() {
 475         LC_ALL="${var_utf8_locale:-en_US.UTF-8}"
 476         export LC_ALL
 477 }
 478
 479 # hg-fast-export | git fast-import with error handling in current directory GIT_DIR
 480 git_hg_fetch() (
 481         set_utf8_locale
 482         _python="${PYTHON:-python}"
 483         _err1=
 484         _err2=
 485         exec 3>&1
 486         { read -r _err1 || :; read -r _err2 || :; } <<-EOT
 487         $(
 488                 exec 4>&3 3>&1 1>&4 4>&-
 489                 {
 490                         _e1=0
 491                         [ -f hg2git-marks ] || touch hg2git-marks
 492                         _af="$(git config hg.authorsfile || :)"
 493                         _cmd='GIT_DIR="$(pwd)" "$_python" "$cfg_basedir/bin/hg-fast-export.py" \
 494                                 --repo    "$(pwd)/repo.hg" \
 495                                 --marks   "$(pwd)/hg2git-marks" \
 496                                 --mapping "$(pwd)/hg2git-mapping" \
 497                                 --heads   "$(pwd)/hg2git-heads" \
 498                                 --status  "$(pwd)/hg2git-state" \
 499                                 -U unknown --force --flatten --hg-hash'
 500                         [ -z "$_af" ] || _cmd="$_cmd"' --authors "$_af"'
 501                         eval "$_cmd" 3>&- || _e1=$?
 502                         echo $_e1 >&3
 503                 } | \
 504                 {
 505                         _e2=0
 506                         rm -f hg2git-marks.new
 507                         git fast-import \
 508                                 --export-marks="$(pwd)/hg2git-marks.new" \
 509                                 --export-pack-edges="$(pwd)/gfi-packs" \
 510                                 --force 3>&- || _e2=$?
 511                         echo $_e2 >&3
 512                 }
 513         )
 514         EOT
 515         exec 3>&-
 516         [ "$_err1" = 0 -a "$_err2" = 0 ] || return 1
 517         if [ -f hg2git-marks ]; then
 518                 rm -f hg2git-marks.old
 519                 mv hg2git-marks hg2git-marks.old
 520         else
 521                 touch hg2git-marks.old
 522         fi
 523         cat hg2git-marks.old hg2git-marks.new | \
 524                 LC_ALL=C sort -t : -k2,2n -u | \
 525                 sed -ne "/^:[1-9][0-9]* $octet20\$/p" > hg2git-marks
 526         rm hg2git-marks.old hg2git-marks.new
 527         rm -f hg2git-heads
 528         git branch --no-color | \
 529         while IFS= read -r _head; do
 530                 echo ":${_head#??} $(git rev-parse "refs/heads/${_head#??}")"
 531         done > hg2git-heads
 532 )