git-sh-setup.sh

   1 # This shell scriplet is meant to be included by other shell scripts
   2 # to set up some variables pointing at the normal git directories and
   3 # a few helper shell functions.
   4
   5 # Having this variable in your environment would break scripts because
   6 # you would cause "cd" to be taken to unexpected places.  If you
   7 # like CDPATH, define it for your interactive shell sessions without
   8 # exporting it.
   9 # But we protect ourselves from such a user mistake nevertheless.
  10 unset CDPATH
  11
  12 # Similarly for IFS, but some shells (e.g. FreeBSD 7.2) are buggy and
  13 # do not equate an unset IFS with IFS with the default, so here is
  14 # an explicit SP HT LF.
  15 IFS='
  16 '
  17
  18 git_broken_path_fix () {
  19         case ":$PATH:" in
  20         *:$1:*) : ok ;;
  21         *)
  22                 PATH=$(
  23                         SANE_TOOL_PATH="$1"
  24                         IFS=: path= sep=
  25                         set x $PATH
  26                         shift
  27                         for elem
  28                         do
  29                                 case "$SANE_TOOL_PATH:$elem" in
  30                                 (?*:/bin | ?*:/usr/bin)
  31                                         path="$path$sep$SANE_TOOL_PATH"
  32                                         sep=:
  33                                         SANE_TOOL_PATH=
  34                                 esac
  35                                 path="$path$sep$elem"
  36                                 sep=:
  37                         done
  38                         echo "$path"
  39                 )
  40                 ;;
  41         esac
  42 }
  43
  44 # @@BROKEN_PATH_FIX@@
  45
  46 die () {
  47         die_with_status 1 "$@"
  48 }
  49
  50 die_with_status () {
  51         status=$1
  52         shift
  53         printf >&2 '%s\n' "$*"
  54         exit "$status"
  55 }
  56
  57 GIT_QUIET=
  58
  59 say () {
  60         if test -z "$GIT_QUIET"
  61         then
  62                 printf '%s\n' "$*"
  63         fi
  64 }
  65
  66 if test -n "$OPTIONS_SPEC"; then
  67         usage() {
  68                 "$0" -h
  69                 exit 1
  70         }
  71
  72         parseopt_extra=
  73         [ -n "$OPTIONS_KEEPDASHDASH" ] &&
  74                 parseopt_extra="--keep-dashdash"
  75
  76         eval "$(
  77                 echo "$OPTIONS_SPEC" |
  78                         git rev-parse --parseopt $parseopt_extra -- "$@" ||
  79                 echo exit $?
  80         )"
  81 else
  82         dashless=$(basename "$0" | sed -e 's/-/ /')
  83         usage() {
  84                 die "usage: $dashless $USAGE"
  85         }
  86
  87         if [ -z "$LONG_USAGE" ]
  88         then
  89                 LONG_USAGE="usage: $dashless $USAGE"
  90         else
  91                 LONG_USAGE="usage: $dashless $USAGE
  92
  93 $LONG_USAGE"
  94         fi
  95
  96         case "$1" in
  97                 -h)
  98                 echo "$LONG_USAGE"
  99                 exit
 100         esac
 101 fi
 102
 103 # Set the name of the end-user facing command in the reflog when the
 104 # script may update refs.  When GIT_REFLOG_ACTION is already set, this
 105 # will not overwrite it, so that a scripted Porcelain (e.g. "git
 106 # rebase") can set it to its own name (e.g. "rebase") and then call
 107 # another scripted Porcelain (e.g. "git am") and a call to this
 108 # function in the latter will keep the name of the end-user facing
 109 # program (e.g. "rebase") in GIT_REFLOG_ACTION, ensuring whatever it
 110 # does will be record as actions done as part of the end-user facing
 111 # operation (e.g. "rebase").
 112 #
 113 # NOTE NOTE NOTE: consequently, after assigning a specific message to
 114 # GIT_REFLOG_ACTION when calling a "git" command to record a custom
 115 # reflog message, do not leave that custom value in GIT_REFLOG_ACTION,
 116 # after you are done.  Other callers of "git" commands that rely on
 117 # writing the default "program name" in reflog expect the variable to
 118 # contain the value set by this function.
 119 #
 120 # To use a custom reflog message, do either one of these three:
 121 #
 122 # (a) use a single-shot export form:
 123 #     GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: preparing frotz" \
 124 #         git command-that-updates-a-ref
 125 #
 126 # (b) save the original away and restore:
 127 #     SAVED_ACTION=$GIT_REFLOG_ACTION
 128 #     GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: preparing frotz"
 129 #     git command-that-updates-a-ref
 130 #     GIT_REFLOG_ACITON=$SAVED_ACTION
 131 #
 132 # (c) assign the variable in a subshell:
 133 #     (
 134 #         GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: preparing frotz"
 135 #         git command-that-updates-a-ref
 136 #     )
 137 set_reflog_action() {
 138         if [ -z "${GIT_REFLOG_ACTION:+set}" ]
 139         then
 140                 GIT_REFLOG_ACTION="$*"
 141                 export GIT_REFLOG_ACTION
 142         fi
 143 }
 144
 145 git_editor() {
 146         if test -z "${GIT_EDITOR:+set}"
 147         then
 148                 GIT_EDITOR="$(git var GIT_EDITOR)" || return $?
 149         fi
 150
 151         eval "$GIT_EDITOR" '"$@"'
 152 }
 153
 154 git_pager() {
 155         if test -t 1
 156         then
 157                 GIT_PAGER=$(git var GIT_PAGER)
 158         else
 159                 GIT_PAGER=cat
 160         fi
 161         : ${LESS=-FRSX}
 162         : ${LV=-c}
 163         export LESS LV
 164
 165         eval "$GIT_PAGER" '"$@"'
 166 }
 167
 168 sane_grep () {
 169         GREP_OPTIONS= LC_ALL=C grep "$@"
 170 }
 171
 172 sane_egrep () {
 173         GREP_OPTIONS= LC_ALL=C egrep "$@"
 174 }
 175
 176 is_bare_repository () {
 177         git rev-parse --is-bare-repository
 178 }
 179
 180 cd_to_toplevel () {
 181         cdup=$(git rev-parse --show-toplevel) &&
 182         cd "$cdup" || {
 183                 echo >&2 "Cannot chdir to $cdup, the toplevel of the working tree"
 184                 exit 1
 185         }
 186 }
 187
 188 require_work_tree_exists () {
 189         if test "z$(git rev-parse --is-bare-repository)" != zfalse
 190         then
 191                 die "fatal: $0 cannot be used without a working tree."
 192         fi
 193 }
 194
 195 require_work_tree () {
 196         test "$(git rev-parse --is-inside-work-tree 2>/dev/null)" = true ||
 197         die "fatal: $0 cannot be used without a working tree."
 198 }
 199
 200 require_clean_work_tree () {
 201         git rev-parse --verify HEAD >/dev/null || exit 1
 202         git update-index -q --ignore-submodules --refresh
 203         err=0
 204
 205         if ! git diff-files --quiet --ignore-submodules
 206         then
 207                 echo >&2 "Cannot $1: You have unstaged changes."
 208                 err=1
 209         fi
 210
 211         if ! git diff-index --cached --quiet --ignore-submodules HEAD --
 212         then
 213                 if [ $err = 0 ]
 214                 then
 215                     echo >&2 "Cannot $1: Your index contains uncommitted changes."
 216                 else
 217                     echo >&2 "Additionally, your index contains uncommitted changes."
 218                 fi
 219                 err=1
 220         fi
 221
 222         if [ $err = 1 ]
 223         then
 224                 test -n "$2" && echo >&2 "$2"
 225                 exit 1
 226         fi
 227 }
 228
 229 # Generate a sed script to parse identities from a commit.
 230 #
 231 # Reads the commit from stdin, which should be in raw format (e.g., from
 232 # cat-file or "--pretty=raw").
 233 #
 234 # The first argument specifies the ident line to parse (e.g., "author"), and
 235 # the second specifies the environment variable to put it in (e.g., "AUTHOR"
 236 # for "GIT_AUTHOR_*"). Multiple pairs can be given to parse author and
 237 # committer.
 238 pick_ident_script () {
 239         while test $# -gt 0
 240         do
 241                 lid=$1; shift
 242                 uid=$1; shift
 243                 printf '%s' "
 244                 /^$lid /{
 245                         s/'/'\\\\''/g
 246                         h
 247                         s/^$lid "'\([^<]*\) <[^>]*> .*$/\1/'"
 248                         s/.*/GIT_${uid}_NAME='&'/p
 249
 250                         g
 251                         s/^$lid "'[^<]* <\([^>]*\)> .*$/\1/'"
 252                         s/.*/GIT_${uid}_EMAIL='&'/p
 253
 254                         g
 255                         s/^$lid "'[^<]* <[^>]*> \(.*\)$/@\1/'"
 256                         s/.*/GIT_${uid}_DATE='&'/p
 257                 }
 258                 "
 259         done
 260         echo '/^$/q'
 261 }
 262
 263 # Create a pick-script as above and feed it to sed. Stdout is suitable for
 264 # feeding to eval.
 265 parse_ident_from_commit () {
 266         LANG=C LC_ALL=C sed -ne "$(pick_ident_script "$@")"
 267 }
 268
 269 # Parse the author from a commit given as an argument. Stdout is suitable for
 270 # feeding to eval to set the usual GIT_* ident variables.
 271 get_author_ident_from_commit () {
 272         encoding=$(git config i18n.commitencoding || echo UTF-8)
 273         git show -s --pretty=raw --encoding="$encoding" "$1" -- |
 274         parse_ident_from_commit author AUTHOR
 275 }
 276
 277 # Clear repo-local GIT_* environment variables. Useful when switching to
 278 # another repository (e.g. when entering a submodule). See also the env
 279 # list in git_connect()
 280 clear_local_git_env() {
 281         unset $(git rev-parse --local-env-vars)
 282 }
 283
 284 # Generate a virtual base file for a two-file merge. Uses git apply to
 285 # remove lines from $1 that are not in $2, leaving only common lines.
 286 create_virtual_base() {
 287         sz0=$(wc -c <"$1")
 288         @@DIFF@@ -u -La/"$1" -Lb/"$1" "$1" "$2" | git apply --no-add
 289         sz1=$(wc -c <"$1")
 290
 291         # If we do not have enough common material, it is not
 292         # worth trying two-file merge using common subsections.
 293         expr $sz0 \< $sz1 \* 2 >/dev/null || : >"$1"
 294 }
 295
 296
 297 # Platform specific tweaks to work around some commands
 298 case $(uname -s) in
 299 *MINGW*)
 300         # Windows has its own (incompatible) sort and find
 301         sort () {
 302                 /usr/bin/sort "$@"
 303         }
 304         find () {
 305                 /usr/bin/find "$@"
 306         }
 307         # git sees Windows-style pwd
 308         pwd () {
 309                 builtin pwd -W
 310         }
 311         is_absolute_path () {
 312                 case "$1" in
 313                 [/\\]* | [A-Za-z]:*)
 314                         return 0 ;;
 315                 esac
 316                 return 1
 317         }
 318         ;;
 319 *)
 320         is_absolute_path () {
 321                 case "$1" in
 322                 /*)
 323                         return 0 ;;
 324                 esac
 325                 return 1
 326         }
 327 esac
 328
 329 # Make sure we are in a valid repository of a vintage we understand,
 330 # if we require to be in a git repository.
 331 if test -z "$NONGIT_OK"
 332 then
 333         GIT_DIR=$(git rev-parse --git-dir) || exit
 334         if [ -z "$SUBDIRECTORY_OK" ]
 335         then
 336                 test -z "$(git rev-parse --show-cdup)" || {
 337                         exit=$?
 338                         echo >&2 "You need to run this command from the toplevel of the working tree."
 339                         exit $exit
 340                 }
 341         fi
 342         test -n "$GIT_DIR" && GIT_DIR=$(cd "$GIT_DIR" && pwd) || {
 343                 echo >&2 "Unable to determine absolute path of git directory"
 344                 exit 1
 345         }
 346         : ${GIT_OBJECT_DIRECTORY="$GIT_DIR/objects"}
 347 fi
 348
 349 peel_committish () {
 350         case "$1" in
 351         :/*)
 352                 peeltmp=$(git rev-parse --verify "$1") &&
 353                 git rev-parse --verify "${peeltmp}^0"
 354                 ;;
 355         *)
 356                 git rev-parse --verify "${1}^0"
 357                 ;;
 358         esac
 359 }