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 $cfg_git_bin --exec-dir
  69         # var_perl_bin          Full path to the perl interpreter to use
  70         # var_have_git_172      Set to 1 if git version >= 1.7.2 otherwise ''
  71         # var_have_git_173      Set to 1 if git version >= 1.7.3 otherwise ''
  72         # var_window_memory     Value to use for repack --window-memory=
  73         # var_big_file_threshold Value to use for core.bigFileThreshold
  74         # var_redelta_threshold Recompute deltas if no more than this many objs
  75         # var_log_window_size   Value to use for git-svn --log-window-size=
  76         # var_utf8_locale       Value to use for a UTF-8 locale if available
  77         # var_xargs_r           A "-r" if xargs needs it to behave correctly
  78         # var_du_exclude        Option to exclude PATTERN from du if available
  79         # var_du_follow         Option to follow command line sym links if available
  80         _cfg_vars="$(get_girocco_config_pm_var_list)"
  81         eval "$_cfg_vars"
  82         printf '%s\n' "$_cfg_vars"
  83         printf 'var_group=%s\n' "${cfg_owning_group:-$(id -gn)}"
  84         _gver="$("$cfg_git_bin" version 2>/dev/null | \
  85                 LC_ALL=C sed -ne 's/^[^0-9]*\([0-9][0-9]*\(\.[0-9][0-9]*\)*\).*$/\1/p')"
  86         printf 'var_git_ver=%s\n' "$_gver"
  87         printf 'var_git_exec_path="%s"\n' "$("$cfg_git_bin" --exec-path 2>/dev/null)"
  88         printf 'var_perl_bin="%s"\n' "${cfg_perl_bin:-$(unset -f perl; command -v perl)}"
  89         printf 'var_have_git_172=%s\n' "$([ $(vcmp "$_gver" 1.7.2) -ge 0 ] && echo 1)"
  90         printf 'var_have_git_173=%s\n' "$([ $(vcmp "$_gver" 1.7.3) -ge 0 ] && echo 1)"
  91         __girocco_conf="$GIROCCO_CONF"
  92         [ -n "$__girocco_conf" ] || __girocco_conf="Girocco::Config"
  93         [ -z "$basedir" ] || __girocco_extrainc="-I$basedir"
  94         printf "var_window_memory=%s\n" \
  95                 "$(perl -I@basedir@ $__girocco_extrainc -M$__girocco_conf \
  96                 -MGirocco::Util -e 'print calc_windowmemory')"
  97         printf "var_big_file_threshold=%s\n" \
  98                 "$(perl -I@basedir@ $__girocco_extrainc -M$__girocco_conf \
  99                 -MGirocco::Util -e 'print calc_bigfilethreshold')"
 100         printf "var_redelta_threshold=%s\n" \
 101                 "$(perl -I@basedir@ $__girocco_extrainc -M$__girocco_conf \
 102                 -MGirocco::Util -e 'print calc_redeltathreshold')"
 103         printf 'var_log_window_size=%s\n' "${cfg_svn_log_window_size:-250}"
 104         # We parse the output of `locale -a` and select a suitable UTF-8 locale.
 105         _guess_locale="$(locale -a | LC_ALL=C grep -viE '^(posix|c)(\..*)?$' | \
 106                 LC_ALL=C grep -iE '\.utf-?8$' | LC_ALL=C sed -e 's/\.[Uu][Tt][Ff]-*8$//' | \
 107                 LC_ALL=C sed -e '/en_US/ s/^/0 /; /en_US/ !s/^/1 /' | LC_ALL=C sort | \
 108                 head -n 1 | LC_ALL=C cut -d ' ' -f 2)"
 109         [ -z "$_guess_locale" ] || printf 'var_utf8_locale=%s.UTF-8\n' "$_guess_locale"
 110         # On some broken platforms running xargs without -r and empty input runs the command
 111         printf 'var_xargs_r=%s\n' "$(: | command xargs echo -r)"
 112         # The disk usage report produces better numbers if du has an exclude option
 113         _x0="$(basename "$0")"
 114         _x0="${_x0%?}?*"
 115         for _duopt in --exclude -I; do
 116                 if _test="$(du $_duopt 's?lib.s*' $_duopt "$_x0" "$0" 2>/dev/null)" && [ -z "$_test" ]; then
 117                         printf 'var_du_exclude=%s\n' "$_duopt"
 118                         break
 119                 fi
 120         done
 121         if _test="$(du -H "$0" 2>/dev/null)" && [ -n "$_test" ]; then
 122                 printf 'var_du_follow=%s\n' "-H"
 123                 break
 124         fi
 125 )
 126
 127 # If basedir has been replaced, and shlib_vars.sh exists, get the config
 128 # definitions from it rather than running Perl.
 129 if [ "@basedir@" = '@'basedir'@' ] || ! [ -r "@basedir@/shlib_vars.sh" ]; then
 130         # Import all the variables from Girocco::Config to the local environment,
 131         eval "$(get_girocco_config_var_list)"
 132 else
 133         # Import the variables from shlib_vars.sh which avoids needlessly
 134         # running another copy of Perl
 135         . "@basedir@/shlib_vars.sh"
 136 fi
 137
 138 # git_add_config "some.var=value"
 139 # every ' in value must be replaced with the 4-character sequence '\'' before
 140 # calling this function or Git will barf.  Will not be effective unless running
 141 # Git version 1.7.3 or later.
 142 git_add_config() {
 143         GIT_CONFIG_PARAMETERS="${GIT_CONFIG_PARAMETERS:+$GIT_CONFIG_PARAMETERS }'$1'"
 144         export GIT_CONFIG_PARAMETERS
 145 }
 146
 147 # Make sure we have a reproducible environment by using a controlled HOME dir
 148 XDG_CONFIG_HOME="$cfg_chroot/var/empty"
 149 HOME="$cfg_chroot/etc/girocco"
 150 TMPDIR="/tmp"
 151 GIT_CONFIG_NOSYSTEM=1
 152 GIT_ATTR_NOSYSTEM=1
 153 GIT_NO_REPLACE_OBJECTS=1
 154 GIT_TERMINAL_PROMPT=0
 155 GIT_ASKPASS="$cfg_basedir/bin/git-askpass-password"
 156 export XDG_CONFIG_HOME
 157 export HOME
 158 export TMPDIR
 159 export GIT_CONFIG_NOSYSTEM
 160 export GIT_ATTR_NOSYSTEM
 161 export GIT_NO_REPLACE_OBJECTS
 162 export GIT_TERMINAL_PROMPT
 163 export GIT_ASKPASS
 164 unset GIT_USER_AGENT
 165 unset GIT_HTTP_USER_AGENT
 166 if [ -n "$defined_cfg_git_client_ua" ]; then
 167         GIT_USER_AGENT="$cfg_git_client_ua"
 168         export GIT_USER_AGENT
 169         GIT_HTTP_USER_AGENT="$cfg_git_client_ua"
 170         export GIT_HTTP_USER_AGENT
 171 fi
 172 unset GIT_CONFIG_PARAMETERS
 173 [ -z "$var_big_file_threshold" ] ||
 174         git_add_config "core.bigFileThreshold=$var_big_file_threshold"
 175
 176 # We cannot use a git() {} or nc_openbsd() {} function to redirect git
 177 # and nc_openbsd to the desired executables because when using
 178 # "ENV_VAR=xxx func" the various /bin/sh implementations behave in various
 179 # different and unexpected ways:
 180 #   a) treat "ENV_VAR=xxx" like a separate, preceding "export ENV_VAR=xxx"
 181 #   b) treat "ENV_VAR=xxx" like a separate, prededing "ENV_VAR=xxx"
 182 #   c) treat "ENV_VAR=xxx" like a temporary setting only while running func
 183 # None of these are good.  We want a temporary "export ENV_VAR=xxx"
 184 # setting only while running func which none of the /bin/sh's do.
 185 #
 186 # Instead we'd like to use an alias that provides the desired behavior without
 187 # any of the bad (a), (b) or (c) effects.
 188 #
 189 # However, unfortunately, some of the crazy /bin/sh implementations do not
 190 # recognize alias expansions when preceded by variable assignments!
 191 #
 192 # So we are left with git() {} and nc_openbsd() {} functions and in the
 193 # case of git() {} we can compensate for (b) and (c) failing to export
 194 # but not (a) and (b) persisting the values so the caller will simply
 195 # have to beware and explicitly unset any variables that should not persist
 196 # beyond the function call itself.
 197
 198 git() (
 199         [ "${GIT_DIR+set}" = "set" ] && export GIT_DIR
 200         [ "${GIT_SSL_NO_VERIFY+set}" = "set" ] && export GIT_SSL_NO_VERIFY
 201         [ "${GIT_TRACE_PACKET+set}" = "set" ] && export GIT_TRACE_PACKET
 202         [ "${GIT_USER_AGENT+set}" = "set" ] && export GIT_USER_AGENT
 203         [ "${GIT_HTTP_USER_AGENT+set}" = "set" ] && export GIT_HTTP_USER_AGENT
 204         exec "$cfg_git_bin" "$@"
 205 )
 206
 207 # see comments for git() -- callers must explicitly export all variables
 208 # intended for the perl interpreter before using this function
 209 perl() { command "${var_perl_bin:-perl}" "$@"; }
 210
 211 nc_openbsd() { "$cfg_nc_openbsd_bin" "$@"; }
 212
 213 list_packs() { command "$cfg_basedir/bin/list_packs" "$@"; }
 214
 215 strftime() { command "$cfg_basedir/bin/strftime" "$@"; }
 216
 217 # Some platforms' broken xargs runs the command always at least once even if
 218 # there's no input unless given a special option.  Automatically supply the
 219 # option on those platforms by providing an xargs function.
 220 xargs() { command xargs $var_xargs_r "$@"; }
 221
 222 _addrlist() {
 223         _list=
 224         for _addr in "$@"; do
 225                 [ -z "$_list" ] || _list="$_list, "
 226                 _list="$_list$_addr"
 227         done
 228         echo "$_list"
 229 }
 230
 231 _sendmail() {
 232         _mailer="${cfg_sendmail_bin:-/usr/sbin/sendmail}"
 233         if [ -n "$cfg_sender" ]; then
 234                 "$_mailer" -i -f "$cfg_sender" "$@"
 235         else
 236                 "$_mailer" -i "$@"
 237         fi
 238 }
 239
 240 mail() {
 241         _subject=
 242         if [ "$1" = "-s" ]; then
 243                 shift
 244                 _subject="$1"
 245                 shift
 246         fi
 247         {
 248                 echo "From: \"$cfg_name\" ($cfg_title) <$cfg_admin>"
 249                 echo "To: $(_addrlist "$@")"
 250                 [ -z "$_subject" ] || echo "Subject: $_subject"
 251                 echo "MIME-Version: 1.0"
 252                 echo "Content-Type: text/plain; charset=utf-8"
 253                 echo "Content-Transfer-Encoding: 8bit"
 254                 [ -n "$cfg_suppress_x_girocco" ] || echo "X-Girocco: $cfg_gitweburl"
 255                 echo "Auto-Submitted: auto-generated"
 256                 echo ""
 257                 cat
 258         } | _sendmail "$@"
 259 }
 260
 261 # bang CMD... will execute the command with well-defined failure mode;
 262 # set bang_action to string of the failed action ('clone', 'update', ...);
 263 # pre-set bang_once=1 to make sure jobs banging on a repo repeatedly will
 264 # not spam the owner; re-define the bang_trap() function to do custom
 265 # cleanup before bailing out
 266 bang() {
 267         if [ -n "$show_progress" ]; then
 268                 exec 3>&1
 269                 errcode=
 270                 read -r errcode <<-EOT || :
 271                 $(
 272                         exec 4>&3 3>&1 1>&4 4>&-
 273                         { "$@" 3>&- || echo $? >&3; } 2>&1 | tee -a "$bang_log"
 274                 )
 275                 EOT
 276                 exec 3>&-
 277                 if [ -z "$errcode" ]; then
 278                         # All right. Cool.
 279                         return;
 280                 fi
 281         else
 282                 if "$@" >>"$bang_log" 2>&1; then
 283                         # All right. Cool.
 284                         return;
 285                 else
 286                         errcode="$?"
 287                 fi
 288         fi
 289         if ! [ -e .banged ] || [ -e .bangagain ]; then
 290                 rm -f .bangagain
 291                 bangmailok=true
 292                 ! [ -f HEAD -a -f config -a -d objects ] ||
 293                 bangmailok="$(GIT_DIR=. git config --bool gitweb.statusupdates 2>/dev/null || echo true)"
 294                 bangaddrs=''
 295                 [ "$bangmailok" = "false" -o -z "$mail" ] || bangaddrs="$mail"
 296                 [ -z "$cfg_admincc" -o "$cfg_admincc" = "0" -o -z "$cfg_admin" ] ||
 297                 if [ -z "$bangaddrs" ]; then bangaddrs="$cfg_admin"; else bangaddrs="$bangaddrs,$cfg_admin"; fi
 298                 [ -z "$bangaddrs" ] ||
 299                 {
 300                         echo "$* failed with error code $errcode"
 301                         echo ""
 302                         [ ! -n "$bang_once" ] || echo "you will not receive any more notifications until recovery"
 303                         echo "this status message may be disabled on the project admin page"
 304                         echo ""
 305                         echo "Log follows:"
 306                         echo ""
 307                         cat "$bang_log"
 308                 } | mail -s "[$cfg_name] $proj $bang_action failed" "$bangaddrs"
 309         fi
 310         touch .banged
 311         cat "$bang_log" > .banglog
 312         bang_trap
 313         exit 1
 314 }
 315
 316 # bang_eval CMD... will evaluate the command with well-defined failure mode;
 317 # Identical to bang CMD... except the command is eval'd instead of executed.
 318 bang_eval() {
 319         bang eval "$*"
 320 }
 321
 322 # Default bang settings:
 323 bang_setup() {
 324         bang_action="lame_programmer"
 325         bang_once=
 326         bang_trap() { :; }
 327         bang_log="$(mktemp -t repomgr-XXXXXX)"
 328         trap 'rm -f "$bang_log"' EXIT
 329         trap 'exit 130' INT
 330         trap 'exit 143' TERM
 331 }
 332
 333 # Remove banged status
 334 bang_reset() {
 335         rm -f .banged .bangagain .banglog
 336 }
 337
 338 # Check to see if banged status
 339 is_banged() {
 340         [ -e .banged ]
 341 }
 342
 343
 344 # Progress report - if show_progress is set, shows the given message.
 345 progress() {
 346         [ ! -n "$show_progress" ] || echo "$@"
 347 }
 348
 349
 350 # Project config accessors; must be run in project directory
 351 config_get() {
 352         git config "gitweb.$1"
 353 }
 354
 355 config_set() {
 356         git config "gitweb.$1" "$2" && chgrp $var_group config && chmod g+w config
 357 }
 358
 359 config_set_raw() {
 360         git config "$1" "$2"        && chgrp $var_group config && chmod g+w config
 361 }
 362
 363 config_get_date_seconds() {
 364         _dt="$(config_get "$1" || :)"
 365         [ -n "$_dt" ] || return 1
 366         _ds="$(perl -I@basedir@ -MGirocco::Util -e "print parse_rfc2822_date('$_dt')")"
 367         [ -n "$_ds" ] || return 1
 368         echo "$_ds"
 369 }
 370
 371 # Tool for checking whether given number of seconds has not passed yet
 372 check_interval() {
 373         os="$(config_get_date_seconds "$1")" || return 1
 374         ns="$(date +%s)"
 375         [ $ns -lt $(($os+$2)) ]
 376 }
 377
 378 # Check if we are running with effective root permissions
 379 is_root() {
 380         [ "$(id -u 2>/dev/null)" = "0" ]
 381 }
 382
 383 # Check to see if the single argument is a Git directory
 384 is_git_dir() {
 385         # Just like Git's test except we ignore GIT_OBJECT_DIRECTORY
 386         # And we are slightly more picky (must be refs/.+ not refs/.*)
 387         [ -d "$1/objects" -a -x "$1/objects" ] || return 1
 388         [ -d "$1/refs" -a -x "$1/refs" ] || return 1
 389         if [ -L "$1/HEAD" ]; then
 390                 _hr="$(readlink "$1/HEAD")"
 391                 case "$_hr" in "refs/"?*) :;; *) return 1;; esac
 392         fi
 393         [ -f "$1/HEAD" -a -r "$1/HEAD" ] || return 1
 394         read -r _hr <"$1/HEAD" || return 1
 395         case "$_hr" in
 396                 $octet20)
 397                         return 0;;
 398                 ref:*)
 399                         _hr="${_hr##ref:*[ $tab]}"
 400                         case "$_hr" in "refs/"?*) return 0;; esac
 401         esac
 402         return 1
 403 }
 404
 405 # List all Git repositories, with given prefix if specified, one-per-line
 406 # All project names starting with _ are always excluded from the result
 407 get_repo_list() {
 408         if [ -n "$1" ]; then
 409                 LC_ALL=C cut -d : -f 1,3 "$cfg_chroot"/etc/group | LC_ALL=C grep "^$1"
 410         else
 411                 LC_ALL=C cut -d : -f 1,3 "$cfg_chroot"/etc/group
 412         fi | while IFS=: read name id; do
 413                 [ $id -lt 65536 ] || case "$name" in _*) :;; ?*) echo "$name"; esac
 414         done
 415 }
 416
 417 # Return success if the given project name has any forks
 418 has_forks() {
 419         _prj="${1%.git}"
 420         [ -n "$_prj" ] || return 1
 421         [ -d "$cfg_reporoot/$_prj" ] || return 1
 422         is_git_dir "$cfg_reporoot/$_prj.git" || return 1
 423         test $(get_repo_list "$_prj/[^/][^/]*:" | LC_ALL=C wc -l) -gt 0
 424 }
 425
 426 # returns empty string and error for empty string otherwise one of
 427 #   m  =>  normal Git mirror
 428 #   s  =>  mirror from svn source
 429 #   d  =>  mirror from darcs source
 430 #   b  =>  mirror from bzr source
 431 #   h  =>  mirror from hg source
 432 #   w  =>  mirror from mediawiki source
 433 #   f  =>  mirror from other fast-import source
 434 # note that if the string is non-empty and none of s, d, b or h match the
 435 # return will always be type m regardless of whether it's a valid Git URL
 436 get_url_mirror_type() {
 437         case "$1" in
 438                 "")
 439                         return 1
 440                         ;;
 441                 svn://* | svn+http://* | svn+https://* | svn+file://* | svn+ssh://*)
 442                         echo 's'
 443                         ;;
 444                 darcs://*)
 445                         echo 'd'
 446                         ;;
 447                 bzr://*)
 448                         echo 'b'
 449                         ;;
 450                 hg+http://* | hg+https://* | hg+file://* | hg+ssh://* | hg::*)
 451                         echo 'h'
 452                         ;;
 453                 mediawiki::*)
 454                         echo 'w'
 455                         ;;
 456                 *)
 457                         echo 'm'
 458                         ;;
 459         esac
 460         return 0
 461 }
 462
 463 # returns false for empty string
 464 # returns true if the passed in url is a mirror using git fast-import
 465 is_gfi_mirror_url() {
 466         [ -n "$1" ] || return 1
 467         case "$(get_url_mirror_type "$1" 2>/dev/null || :)" in
 468                 d|b|h|w|f)
 469                         # darcs, bzr, hg and mediawiki mirrors use git fast-import
 470                         # and so do generic "f" fast-import mirrors
 471                         return 0
 472                         ;;
 473                 *)
 474                         # Don't think git-svn currently uses git fast-import
 475                         # And Git mirrors certainly do not
 476                         return 1
 477                         ;;
 478         esac
 479         # assume it does not use git fast-import
 480         return 1
 481 }
 482
 483 # returns mirror url for gitweb.baseurl of git directory
 484 # (GIT_DIR) passed in as the argument (which defaults to "." if omitted)
 485 # will fail if the directory does not have .nofetch and gitweb.baseurl
 486 # comes back empty -- otherwise .nofetch directories succeed with a "" return
 487 # automatically strips any leading "disabled " prefix before returning result
 488 get_mirror_url() {
 489         _gitdir="${1:-.}"
 490         # always return empty for non-mirrors
 491         [ ! -e "$_gitdir/.nofetch" ] || return 0
 492         _url="$(GIT_DIR="$_gitdir" config_get baseurl 2>/dev/null || :)"
 493         _url="${_url##* }"
 494         [ -n "$_url" ] || return 1
 495         printf '%s\n' "$_url"
 496         return 0
 497 }
 498
 499 # returns get_url_mirror_type for gitweb.baseurl of git directory
 500 # (GIT_DIR) passed in as the argument (which defaults to "." if omitted)
 501 # will fail if the directory does not have .nofetch and gitweb.baseurl
 502 # comes back empty -- otherwise .nofetch directories succeed with a "" return
 503 # automatically strips any leading "disabled " prefix before testing
 504 get_mirror_type() {
 505         _url="$(get_mirror_url "$@")" || return 1
 506         get_url_mirror_type "$_url"
 507 }
 508
 509 # returns true if the passed in git dir (defaults to ".") is a mirror using git fast-import
 510 is_gfi_mirror() {
 511         _url="$(get_mirror_url "$@")" || return 1
 512         is_gfi_mirror_url "$_url"
 513 }
 514
 515 # returns true if the passed in git dir (defaults to ".") is a mirror using git-svn
 516 is_svn_mirror() {
 517         [ "$(get_mirror_type "$1" 2>/dev/null || :)" = "s" ]
 518 }
 519
 520 # A well-known UTF-8 locale is required for some of the fast-import providers
 521 # in order to avoid mangling characters.  Ideally we could use "POSIX.UTF-8"
 522 # but that is not reliably UTF-8 but rather usually US-ASCII.
 523 # We parse the output of `locale -a` and select a suitable UTF-8 locale at
 524 # install time and store that in $var_utf8_locale if one is found.
 525 # If we cannot find one in the `locale -a` output then we just use a well-known
 526 # UTF-8 locale and hope for the best.  We set LC_ALL to our choice and export
 527 # it.  We only set this temporarily when running the fast-import providers.
 528 set_utf8_locale() {
 529         LC_ALL="${var_utf8_locale:-en_US.UTF-8}"
 530         export LC_ALL
 531 }
 532
 533 # hg-fast-export | git fast-import with error handling in current directory GIT_DIR
 534 git_hg_fetch() (
 535         set_utf8_locale
 536         _python="${PYTHON:-python}"
 537         [ -e hg2git-marks ] || >hg2git-marks
 538         rm -f hg2git-marks.new
 539         _err1=
 540         _err2=
 541         exec 3>&1
 542         { read -r _err1 || :; read -r _err2 || :; } <<-EOT
 543         $(
 544                 exec 4>&3 3>&1 1>&4 4>&-
 545                 {
 546                         _e1=0
 547                         _af="$(git config hg.authorsfile || :)"
 548                         _cmd='GIT_DIR="$(pwd)" "$_python" "$cfg_basedir/bin/hg-fast-export.py" \
 549                                 --repo    "$(pwd)/repo.hg" \
 550                                 --marks   "$(pwd)/hg2git-marks" \
 551                                 --mapping "$(pwd)/hg2git-mapping" \
 552                                 --heads   "$(pwd)/hg2git-heads" \
 553                                 --status  "$(pwd)/hg2git-state" \
 554                                 -U unknown --force --flatten --hg-hash'
 555                         [ -z "$_af" ] || _cmd="$_cmd"' --authors "$_af"'
 556                         eval "$_cmd" 3>&- || _e1=$?
 557                         echo $_e1 >&3
 558                 } | \
 559                 {
 560                         _e2=0
 561                         git fast-import \
 562                                 --import-marks="$(pwd)/hg2git-marks" \
 563                                 --export-marks="$(pwd)/hg2git-marks.new" \
 564                                 --export-pack-edges="$(pwd)/gfi-packs" \
 565                                 --force 3>&- || _e2=$?
 566                         echo $_e2 >&3
 567                 }
 568         )
 569         EOT
 570         exec 3>&-
 571         [ "$_err1" = 0 -a "$_err2" = 0 ] || return 1
 572         mv -f hg2git-marks.new hg2git-marks
 573         git for-each-ref --format='%(refname) %(objectname)' refs/heads | \
 574         LC_ALL=C sed -e 's,^refs/heads/,:,' >hg2git-heads
 575 )