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         [ -n "$OPTIONS_STUCKLONG" ] &&
  76                 parseopt_extra="$parseopt_extra --stuck-long"
  77
  78         eval "$(
  79                 echo "$OPTIONS_SPEC" |
  80                         git rev-parse --parseopt $parseopt_extra -- "$@" ||
  81                 echo exit $?
  82         )"
  83 else
  84         dashless=$(basename "$0" | sed -e 's/-/ /')
  85         usage() {
  86                 die "usage: $dashless $USAGE"
  87         }
  88
  89         if [ -z "$LONG_USAGE" ]
  90         then
  91                 LONG_USAGE="usage: $dashless $USAGE"
  92         else
  93                 LONG_USAGE="usage: $dashless $USAGE
  94
  95 $LONG_USAGE"
  96         fi
  97
  98         case "$1" in
  99                 -h)
 100                 echo "$LONG_USAGE"
 101                 exit
 102         esac
 103 fi
 104
 105 # Set the name of the end-user facing command in the reflog when the
 106 # script may update refs.  When GIT_REFLOG_ACTION is already set, this
 107 # will not overwrite it, so that a scripted Porcelain (e.g. "git
 108 # rebase") can set it to its own name (e.g. "rebase") and then call
 109 # another scripted Porcelain (e.g. "git am") and a call to this
 110 # function in the latter will keep the name of the end-user facing
 111 # program (e.g. "rebase") in GIT_REFLOG_ACTION, ensuring whatever it
 112 # does will be record as actions done as part of the end-user facing
 113 # operation (e.g. "rebase").
 114 #
 115 # NOTE NOTE NOTE: consequently, after assigning a specific message to
 116 # GIT_REFLOG_ACTION when calling a "git" command to record a custom
 117 # reflog message, do not leave that custom value in GIT_REFLOG_ACTION,
 118 # after you are done.  Other callers of "git" commands that rely on
 119 # writing the default "program name" in reflog expect the variable to
 120 # contain the value set by this function.
 121 #
 122 # To use a custom reflog message, do either one of these three:
 123 #
 124 # (a) use a single-shot export form:
 125 #     GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: preparing frotz" \
 126 #         git command-that-updates-a-ref
 127 #
 128 # (b) save the original away and restore:
 129 #     SAVED_ACTION=$GIT_REFLOG_ACTION
 130 #     GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: preparing frotz"
 131 #     git command-that-updates-a-ref
 132 #     GIT_REFLOG_ACITON=$SAVED_ACTION
 133 #
 134 # (c) assign the variable in a subshell:
 135 #     (
 136 #         GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: preparing frotz"
 137 #         git command-that-updates-a-ref
 138 #     )
 139 set_reflog_action() {
 140         if [ -z "${GIT_REFLOG_ACTION:+set}" ]
 141         then
 142                 GIT_REFLOG_ACTION="$*"
 143                 export GIT_REFLOG_ACTION
 144         fi
 145 }
 146
 147 git_editor() {
 148         if test -z "${GIT_EDITOR:+set}"
 149         then
 150                 GIT_EDITOR="$(git var GIT_EDITOR)" || return $?
 151         fi
 152
 153         eval "$GIT_EDITOR" '"$@"'
 154 }
 155
 156 git_pager() {
 157         if test -t 1
 158         then
 159                 GIT_PAGER=$(git var GIT_PAGER)
 160         else
 161                 GIT_PAGER=cat
 162         fi
 163         : ${LESS=-FRX}
 164         : ${LV=-c}
 165         export LESS LV
 166
 167         eval "$GIT_PAGER" '"$@"'
 168 }
 169
 170 sane_grep () {
 171         GREP_OPTIONS= LC_ALL=C grep "$@"
 172 }
 173
 174 sane_egrep () {
 175         GREP_OPTIONS= LC_ALL=C egrep "$@"
 176 }
 177
 178 is_bare_repository () {
 179         git rev-parse --is-bare-repository
 180 }
 181
 182 cd_to_toplevel () {
 183         cdup=$(git rev-parse --show-toplevel) &&
 184         cd "$cdup" || {
 185                 echo >&2 "Cannot chdir to $cdup, the toplevel of the working tree"
 186                 exit 1
 187         }
 188 }
 189
 190 require_work_tree_exists () {
 191         if test "z$(git rev-parse --is-bare-repository)" != zfalse
 192         then
 193                 die "fatal: $0 cannot be used without a working tree."
 194         fi
 195 }
 196
 197 require_work_tree () {
 198         test "$(git rev-parse --is-inside-work-tree 2>/dev/null)" = true ||
 199         die "fatal: $0 cannot be used without a working tree."
 200 }
 201
 202 require_clean_work_tree () {
 203         git rev-parse --verify HEAD >/dev/null || exit 1
 204         git update-index -q --ignore-submodules --refresh
 205         err=0
 206
 207         if ! git diff-files --quiet --ignore-submodules
 208         then
 209                 echo >&2 "Cannot $1: You have unstaged changes."
 210                 err=1
 211         fi
 212
 213         if ! git diff-index --cached --quiet --ignore-submodules HEAD --
 214         then
 215                 if [ $err = 0 ]
 216                 then
 217                     echo >&2 "Cannot $1: Your index contains uncommitted changes."
 218                 else
 219                     echo >&2 "Additionally, your index contains uncommitted changes."
 220                 fi
 221                 err=1
 222         fi
 223
 224         if [ $err = 1 ]
 225         then
 226                 test -n "$2" && echo >&2 "$2"
 227                 exit 1
 228         fi
 229 }
 230
 231 # Generate a sed script to parse identities from a commit.
 232 #
 233 # Reads the commit from stdin, which should be in raw format (e.g., from
 234 # cat-file or "--pretty=raw").
 235 #
 236 # The first argument specifies the ident line to parse (e.g., "author"), and
 237 # the second specifies the environment variable to put it in (e.g., "AUTHOR"
 238 # for "GIT_AUTHOR_*"). Multiple pairs can be given to parse author and
 239 # committer.
 240 pick_ident_script () {
 241         while test $# -gt 0
 242         do
 243                 lid=$1; shift
 244                 uid=$1; shift
 245                 printf '%s' "
 246                 /^$lid /{
 247                         s/'/'\\\\''/g
 248                         h
 249                         s/^$lid "'\([^<]*\) <[^>]*> .*$/\1/'"
 250                         s/.*/GIT_${uid}_NAME='&'/p
 251
 252                         g
 253                         s/^$lid "'[^<]* <\([^>]*\)> .*$/\1/'"
 254                         s/.*/GIT_${uid}_EMAIL='&'/p
 255
 256                         g
 257                         s/^$lid "'[^<]* <[^>]*> \(.*\)$/@\1/'"
 258                         s/.*/GIT_${uid}_DATE='&'/p
 259                 }
 260                 "
 261         done
 262         echo '/^$/q'
 263 }
 264
 265 # Create a pick-script as above and feed it to sed. Stdout is suitable for
 266 # feeding to eval.
 267 parse_ident_from_commit () {
 268         LANG=C LC_ALL=C sed -ne "$(pick_ident_script "$@")"
 269 }
 270
 271 # Parse the author from a commit given as an argument. Stdout is suitable for
 272 # feeding to eval to set the usual GIT_* ident variables.
 273 get_author_ident_from_commit () {
 274         encoding=$(git config i18n.commitencoding || echo UTF-8)
 275         git show -s --pretty=raw --encoding="$encoding" "$1" -- |
 276         parse_ident_from_commit author AUTHOR
 277 }
 278
 279 # Clear repo-local GIT_* environment variables. Useful when switching to
 280 # another repository (e.g. when entering a submodule). See also the env
 281 # list in git_connect()
 282 clear_local_git_env() {
 283         unset $(git rev-parse --local-env-vars)
 284 }
 285
 286 # Generate a virtual base file for a two-file merge. Uses git apply to
 287 # remove lines from $1 that are not in $2, leaving only common lines.
 288 create_virtual_base() {
 289         sz0=$(wc -c <"$1")
 290         @@DIFF@@ -u -La/"$1" -Lb/"$1" "$1" "$2" | git apply --no-add
 291         sz1=$(wc -c <"$1")
 292
 293         # If we do not have enough common material, it is not
 294         # worth trying two-file merge using common subsections.
 295         expr $sz0 \< $sz1 \* 2 >/dev/null || : >"$1"
 296 }
 297
 298
 299 # Platform specific tweaks to work around some commands
 300 case $(uname -s) in
 301 *MINGW*)
 302         # Windows has its own (incompatible) sort and find
 303         sort () {
 304                 /usr/bin/sort "$@"
 305         }
 306         find () {
 307                 /usr/bin/find "$@"
 308         }
 309         # git sees Windows-style pwd
 310         pwd () {
 311                 builtin pwd -W
 312         }
 313         is_absolute_path () {
 314                 case "$1" in
 315                 [/\\]* | [A-Za-z]:*)
 316                         return 0 ;;
 317                 esac
 318                 return 1
 319         }
 320         ;;
 321 *)
 322         is_absolute_path () {
 323                 case "$1" in
 324                 /*)
 325                         return 0 ;;
 326                 esac
 327                 return 1
 328         }
 329 esac
 330
 331 # Make sure we are in a valid repository of a vintage we understand,
 332 # if we require to be in a git repository.
 333 if test -z "$NONGIT_OK"
 334 then
 335         GIT_DIR=$(git rev-parse --git-dir) || exit
 336         if [ -z "$SUBDIRECTORY_OK" ]
 337         then
 338                 test -z "$(git rev-parse --show-cdup)" || {
 339                         exit=$?
 340                         echo >&2 "You need to run this command from the toplevel of the working tree."
 341                         exit $exit
 342                 }
 343         fi
 344         test -n "$GIT_DIR" && GIT_DIR=$(cd "$GIT_DIR" && pwd) || {
 345                 echo >&2 "Unable to determine absolute path of git directory"
 346                 exit 1
 347         }
 348         : ${GIT_OBJECT_DIRECTORY="$GIT_DIR/objects"}
 349 fi
 350
 351 peel_committish () {
 352         case "$1" in
 353         :/*)
 354                 peeltmp=$(git rev-parse --verify "$1") &&
 355                 git rev-parse --verify "${peeltmp}^0"
 356                 ;;
 357         *)
 358                 git rev-parse --verify "${1}^0"
 359                 ;;
 360         esac
 361 }