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 $cfg_* shell variables.
   5
   6 # SHA-1 pattern
   7 octet='[0-9a-f][0-9a-f]'
   8 octet4="$octet$octet$octet$octet"
   9 octet19="$octet4$octet4$octet4$octet4$octet$octet$octet"
  10 octet20="$octet4$octet4$octet4$octet4$octet4"
  11
  12 get_girocco_config_var_list() {
  13         # Export all the variables from Girocco::Config to suitable var= lines
  14         # prefixing them with 'cfg_'. E.g. $cfg_admin is admin's mail address now
  15         # and also setting a 'defined_cfg_' prefix to 1 if they are not undef.
  16         __girocco_conf="$GIROCCO_CONF"
  17         [ -n "$__girocco_conf" ] || __girocco_conf="Girocco::Config"
  18         [ -z "$basedir" ] || __girocco_extrainc="-I$basedir"
  19         perl -I@basedir@ $__girocco_extrainc -M$__girocco_conf -le \
  20                 'foreach (sort {uc($a) cmp uc($b)} keys %Girocco::Config::) {
  21                         my $val = ${$Girocco::Config::{$_}}; defined($val) or $val="";
  22                         $val =~ s/([\\"\$\`])/\\$1/gos;
  23                         $val =~ s/(?:\r\n|\r|\n)$//os;
  24                         print "cfg_$_=\"$val\"";
  25                         print "defined_cfg_$_=",
  26                                 (defined(${$Girocco::Config::{$_}})?"1":"");
  27                 }'
  28 }
  29
  30 # If basedir has been replaced, and shlib_vars.sh exists, get the config
  31 # definitions from it rather than running Perl.
  32 if [ "@basedir@" = '@'basedir'@' ] || ! [ -r "@basedir@/shlib_vars.sh" ]; then
  33         # Import all the variables from Girocco::Config to the local environment,
  34         eval "$(get_girocco_config_var_list)"
  35 else
  36         # Import the variables from shlib_vars.sh which avoids needlessly
  37         # running another copy of Perl
  38         . "@basedir@/shlib_vars.sh"
  39 fi
  40
  41 # We cannot use a git() {} or nc_openbsd() {} function to redirect git
  42 # and nc_openbsd to the desired executables because when using
  43 # "ENV_VAR=xxx func" the various /bin/sh implementations behave in various
  44 # different and unexpected ways:
  45 #   a) treat "ENV_VAR=xxx" like a separate, preceding "export ENV_VAR=xxx"
  46 #   b) treat "ENV_VAR=xxx" like a separate, prededing "ENV_VAR=xxx"
  47 #   c) treat "ENV_VAR=xxx" like a temporary setting only while running func
  48 # None of these are good.  We want a temporary "export ENV_VAR=xxx"
  49 # setting only while running func which none of the /bin/sh's do.
  50 #
  51 # Instead we'd like to use an alias that provides the desired behavior without
  52 # any of the bad (a), (b) or (c) effects.
  53 #
  54 # However, unfortunately, some of the crazy /bin/sh implementations do not
  55 # recognize alias expansions when preceded by variable assignments!
  56 #
  57 # So we are left with git() {} and nc_openbsd() {} functions and in the
  58 # case of git() {} we can compensate for (b) and (c) failing to export
  59 # but not (a) and (b) persisting the values so the caller will simply
  60 # have to beware and explicitly unset any variables that should not persist
  61 # beyond the function call itself.
  62
  63 git() (
  64         [ "${GIT_DIR+set}" = "set" ] && export GIT_DIR
  65         [ "${GIT_SSL_NO_VERIFY+set}" = "set" ] && export GIT_SSL_NO_VERIFY
  66         [ "${GIT_TRACE_PACKET+set}" = "set" ] && export GIT_TRACE_PACKET
  67         [ "${GIT_USER_AGENT+set}" = "set" ] && export GIT_USER_AGENT
  68         XDG_CONFIG_HOME="$cfg_chroot/var/empty"
  69         HOME="$cfg_chroot/etc/girocco"
  70         GIT_CONFIG_NOSYSTEM=1
  71         GIT_ATTR_NOSYSTEM=1
  72         export XDG_CONFIG_HOME
  73         export HOME
  74         export GIT_CONFIG_NOSYSTEM
  75         export GIT_ATTR_NOSYSTEM
  76         exec "$cfg_git_bin" "$@"
  77 )
  78
  79 nc_openbsd() { "$cfg_nc_openbsd_bin" "$@"; }
  80
  81 _addrlist() {
  82         _list=
  83         for _addr in "$@"; do
  84                 [ -z "$_list" ] || _list="$_list, "
  85                 _list="$_list$_addr"
  86         done
  87         echo "$_list"
  88 }
  89
  90 _sendmail() {
  91         _mailer="${cfg_sendmail_bin:-/usr/sbin/sendmail}"
  92         if [ -n "$cfg_sender" ]; then
  93                 "$_mailer" -i -f "$cfg_sender" "$@"
  94         else
  95                 "$_mailer" -i "$@"
  96         fi
  97 }
  98
  99 mail() {
 100         _subject=
 101         if [ "$1" = "-s" ]; then
 102                 shift
 103                 _subject="$1"
 104                 shift
 105         fi
 106         {
 107                 echo "From: \"$cfg_name\" ($cfg_title) <$cfg_admin>"
 108                 echo "To: $(_addrlist "$@")"
 109                 [ -z "$_subject" ] || echo "Subject: $_subject"
 110                 echo "MIME-Version: 1.0"
 111                 echo "Content-Type: text/plain; charset=utf-8"
 112                 echo "Content-Transfer-Encoding: 8bit"
 113                 echo "Auto-Submitted: auto-generated"
 114                 echo ""
 115                 cat
 116         } | _sendmail "$@"
 117 }
 118
 119 # bang CMD... will execute the command with well-defined failure mode;
 120 # set bang_action to string of the failed action ('clone', 'update', ...);
 121 # pre-set bang_once=1 to make sure jobs banging on a repo repeatedly will
 122 # not spam the owner; re-define the bang_trap() function to do custom
 123 # cleanup before bailing out
 124 bang() {
 125         if [ -n "$show_progress" ]; then
 126                 exec 3>&1
 127                 errcode=
 128                 read -r errcode <<-EOT || :
 129                 $(
 130                         exec 4>&3 3>&1 1>&4 4>&-
 131                         { "$@" 3>&- || echo $? >&3; } 2>&1 | tee -a "$bang_log"
 132                 )
 133                 EOT
 134                 exec 3>&-
 135                 if [ -z "$errcode" ]; then
 136                         # All right. Cool.
 137                         return;
 138                 fi
 139         else
 140                 if "$@" >>"$bang_log" 2>&1; then
 141                         # All right. Cool.
 142                         return;
 143                 else
 144                         errcode="$?"
 145                 fi
 146         fi
 147         if ! [ -e .banged ] || [ -e .bangagain ]; then
 148                 rm -f .bangagain
 149                 bangmailok=true
 150                 ! [ -f HEAD -a -f config -a -d objects ] ||
 151                 bangmailok="$(GIT_DIR=. git config --bool gitweb.statusupdates 2>/dev/null || echo true)"
 152                 bangaddrs=''
 153                 [ "$bangmailok" = "false" -o -z "$mail" ] || bangaddrs="$mail"
 154                 [ -z "$cfg_admincc" -o "$cfg_admincc" = "0" -o -z "$cfg_admin" ] ||
 155                 if [ -z "$bangaddrs" ]; then bangaddrs="$cfg_admin"; else bangaddrs="$bangaddrs,$cfg_admin"; fi
 156                 [ -z "$bangaddrs" ] ||
 157                 {
 158                         echo "$* failed with error code $errcode"
 159                         echo ""
 160                         [ ! -n "$bang_once" ] || echo "you will not receive any more notifications until recovery"
 161                         echo "this status message may be disabled on the project admin page"
 162                         echo ""
 163                         echo "Log follows:"
 164                         echo ""
 165                         cat "$bang_log"
 166                 } | mail -s "[$cfg_name] $proj $bang_action failed" "$bangaddrs"
 167         fi
 168         touch .banged
 169         bang_trap
 170         exit 1
 171 }
 172
 173 # bang_eval CMD... will evaluate the command with well-defined failure mode;
 174 # Identical to bang CMD... except the command is eval'd instead of executed.
 175 bang_eval() {
 176         bang eval "$*"
 177 }
 178
 179 # Default bang settings:
 180 bang_setup() {
 181         bang_action="lame_programmer"
 182         bang_once=
 183         bang_trap() { :; }
 184         bang_log="$(mktemp -t repomgr-XXXXXX)"
 185         trap "rm \"\$bang_log\"" EXIT
 186 }
 187
 188
 189 # Progress report - if show_progress is set, shows the given message.
 190 progress() {
 191         [ ! -n "$show_progress" ] || echo "$@"
 192 }
 193
 194
 195 # Project config accessors; must be run in project directory
 196 config_get() {
 197         git config "gitweb.$1"
 198 }
 199
 200 config_set() {
 201         git config "gitweb.$1" "$2" && chgrp repo config && chmod g+w config
 202 }
 203
 204 config_set_raw() {
 205         git config "$1" "$2"        && chgrp repo config && chmod g+w config
 206 }
 207
 208 config_get_date_seconds() {
 209         _dt="$(config_get "$1" || :)"
 210         [ -n "$_dt" ] || return 1
 211         _ds="$(perl -I@basedir@ -MGirocco::Util -e "print parse_rfc2822_date('$_dt')")"
 212         [ -n "$_ds" ] || return 1
 213         echo "$_ds"
 214 }
 215
 216 # Tool for checking whether given number of seconds has not passed yet
 217 check_interval() {
 218         os="$(config_get_date_seconds "$1")" || return 1
 219         ns="$(date +%s)"
 220         [ $ns -lt $(($os+$2)) ]
 221 }
 222
 223
 224 # List all Git repositories, with given prefix if specified, one-per-line
 225 get_repo_list() {
 226         if [ -n "$1" ]; then
 227                 cut -d : -f 1,3 "$cfg_chroot"/etc/group | grep "^$1"
 228         else
 229                 cut -d : -f 1,3 "$cfg_chroot"/etc/group
 230         fi | while IFS=: read name id; do
 231                 [ $id -lt 65536 ] || echo "$name"
 232         done
 233 }
 234
 235 # returns true if the passed in git dir (defaults to ".") is a mirror using git fast-import
 236 is_gfi_mirror() {
 237         _gitdir="${1-.}"
 238         # always return false for non-mirrors
 239         [ ! -e "$_gitdir/.nofetch" ] || return 1
 240         _url="$(GIT_DIR="$_gitdir" config_get baseurl 2>/dev/null || :)"
 241         case "$_url" in
 242                 svn://* | svn+http://* | svn+https://*)
 243                         # Don't think git-svn currently uses git fast-import
 244                         return 1
 245                         ;;
 246                 darcs://*)
 247                         # darcs mirrors use git fast-import
 248                         return 0
 249                         ;;
 250                 bzr://*)
 251                         # bzr mirrors use git fast-import
 252                         return 0
 253                         ;;
 254                 hg+http://* | hg+https://*)
 255                         # hg mirrors use git fast-import
 256                         return 0
 257                         ;;
 258         esac
 259         # assume it does not use git fast-import
 260         return 1
 261 }
 262
 263 # returns true if the passed in git dir (defaults to ".") is a mirror using git-svn
 264 is_svn_mirror() {
 265         _gitdir="${1-.}"
 266         # always return false for non-mirrors
 267         [ ! -e "$_gitdir/.nofetch" ] || return 1
 268         _url="$(GIT_DIR="$_gitdir" config_get baseurl 2>/dev/null || :)"
 269         case "$_url" in
 270                 svn://* | svn+http://* | svn+https://*)
 271                         return 0
 272         esac
 273         return 1
 274 }
 275
 276 # A well-known UTF-8 locale is required for some of the fast-import providers
 277 # in order to avoid mangling characters.  Ideally we could use "POSIX.UTF-8"
 278 # but that is not reliably UTF-8 but rather usually US-ASCII.
 279 # We parse the output of `locale -a` and select a suitable UTF-8 locale.
 280 # If we cannot find one in the `locale -a` output then we just use a well-known
 281 # UTF-8 locale and hope for the best.  We set LC_ALL to our choice and export
 282 # it.  We only set this temporarily when running the fast-import providers.
 283 set_utf8_locale() {
 284         _guess_locale="$(locale -a | grep -viE '^(posix|c)(\..*)?$' | \
 285                 grep -iE '\.utf-?8$' | sed -e 's/\.[Uu][Tt][Ff]-*8$//' | \
 286                 sed -e '/en_US/ s/^/0 /; /en_US/ !s/^/1 /' | LC_ALL=C sort | \
 287                 head -n 1 | cut -d ' ' -f 2)"
 288         LC_ALL="${_guess_locale:-en_US}.UTF-8"
 289         export LC_ALL
 290 }
 291
 292 # hg-fast-export | git fast-import with error handling in current directory GIT_DIR
 293 git_hg_fetch() (
 294         set_utf8_locale
 295         _python="${PYTHON:-python}"
 296         _err1=
 297         _err2=
 298         exec 3>&1
 299         { read -r _err1 || :; read -r _err2 || :; } <<-EOT
 300         $(
 301                 exec 4>&3 3>&1 1>&4 4>&-
 302                 {
 303                         _e1=0
 304                         [ -f hg2git-marks ] || touch hg2git-marks
 305                         _af="$(git config hg.authorsfile || :)"
 306                         _cmd='GIT_DIR="$(pwd)" "$_python" "$cfg_basedir/bin/hg-fast-export.py" \
 307                                 --repo    "$(pwd)/repo.hg" \
 308                                 --marks   "$(pwd)/hg2git-marks" \
 309                                 --mapping "$(pwd)/hg2git-mapping" \
 310                                 --heads   "$(pwd)/hg2git-heads" \
 311                                 --status  "$(pwd)/hg2git-state" \
 312                                 -U unknown --force --flatten --hg-hash'
 313                         [ -z "$_af" ] || _cmd="$_cmd"' --authors "$_af"'
 314                         eval "$_cmd" 3>&- || _e1=$?
 315                         echo $_e1 >&3
 316                 } | \
 317                 {
 318                         _e2=0
 319                         rm -f hg2git-marks.new
 320                         git fast-import \
 321                                 --export-marks="$(pwd)/hg2git-marks.new" \
 322                                 --export-pack-edges="$(pwd)/gfi-packs" \
 323                                 --force 3>&- || _e2=$?
 324                         echo $_e2 >&3
 325                 }
 326         )
 327         EOT
 328         exec 3>&-
 329         [ "$_err1" = 0 -a "$_err2" = 0 ] || return 1
 330         if [ -f hg2git-marks ]; then
 331                 rm -f hg2git-marks.old
 332                 mv hg2git-marks hg2git-marks.old
 333         else
 334                 touch hg2git-marks.old
 335         fi
 336         cat hg2git-marks.old hg2git-marks.new | \
 337                 LC_ALL=C sort -t : -k2,2n -u | \
 338                 sed -ne "/^:[1-9][0-9]* $octet20\$/p" > hg2git-marks
 339         rm hg2git-marks.old hg2git-marks.new
 340         rm -f hg2git-heads
 341         git branch --no-color | \
 342         while IFS= read -r _head; do
 343                 echo ":${_head#??} $(git rev-parse "refs/heads/${_head#??}")"
 344         done > hg2git-heads
 345 )