git-sh-setup.sh

   1 #!/bin/sh
   2 #
   3 # This is included in commands that either have to be run from the toplevel
   4 # of the repository, or with GIT_DIR environment variable properly.
   5 # If the GIT_DIR does not look like the right correct git-repository,
   6 # it dies.
   7
   8 # Having this variable in your environment would break scripts because
   9 # you would cause "cd" to be taken to unexpected places.  If you
  10 # like CDPATH, define it for your interactive shell sessions without
  11 # exporting it.
  12 # But we protect ourselves from such a user mistake nevertheless.
  13 unset CDPATH
  14
  15 # Similarly for IFS, but some shells (e.g. FreeBSD 7.2) are buggy and
  16 # do not equate an unset IFS with IFS with the default, so here is
  17 # an explicit SP HT LF.
  18 IFS='
  19 '
  20
  21 git_broken_path_fix () {
  22         case ":$PATH:" in
  23         *:$1:*) : ok ;;
  24         *)
  25                 PATH=$(
  26                         SANE_TOOL_PATH="$1"
  27                         IFS=: path= sep=
  28                         set x $PATH
  29                         shift
  30                         for elem
  31                         do
  32                                 case "$SANE_TOOL_PATH:$elem" in
  33                                 (?*:/bin | ?*:/usr/bin)
  34                                         path="$path$sep$SANE_TOOL_PATH"
  35                                         sep=:
  36                                         SANE_TOOL_PATH=
  37                                 esac
  38                                 path="$path$sep$elem"
  39                                 sep=:
  40                         done
  41                         echo "$path"
  42                 )
  43                 ;;
  44         esac
  45 }
  46
  47 # @@BROKEN_PATH_FIX@@
  48
  49 die () {
  50         die_with_status 1 "$@"
  51 }
  52
  53 die_with_status () {
  54         status=$1
  55         shift
  56         printf >&2 '%s\n' "$*"
  57         exit "$status"
  58 }
  59
  60 GIT_QUIET=
  61
  62 say () {
  63         if test -z "$GIT_QUIET"
  64         then
  65                 printf '%s\n' "$*"
  66         fi
  67 }
  68
  69 if test -n "$OPTIONS_SPEC"; then
  70         usage() {
  71                 "$0" -h
  72                 exit 1
  73         }
  74
  75         parseopt_extra=
  76         [ -n "$OPTIONS_KEEPDASHDASH" ] &&
  77                 parseopt_extra="--keep-dashdash"
  78
  79         eval "$(
  80                 echo "$OPTIONS_SPEC" |
  81                         git rev-parse --parseopt $parseopt_extra -- "$@" ||
  82                 echo exit $?
  83         )"
  84 else
  85         dashless=$(basename "$0" | sed -e 's/-/ /')
  86         usage() {
  87                 die "usage: $dashless $USAGE"
  88         }
  89
  90         if [ -z "$LONG_USAGE" ]
  91         then
  92                 LONG_USAGE="usage: $dashless $USAGE"
  93         else
  94                 LONG_USAGE="usage: $dashless $USAGE
  95
  96 $LONG_USAGE"
  97         fi
  98
  99         case "$1" in
 100                 -h)
 101                 echo "$LONG_USAGE"
 102                 exit
 103         esac
 104 fi
 105
 106 # Set the name of the end-user facing command in the reflog when the
 107 # script may update refs.  When GIT_REFLOG_ACTION is already set, this
 108 # will not overwrite it, so that a scripted Porcelain (e.g. "git
 109 # rebase") can set it to its own name (e.g. "rebase") and then call
 110 # another scripted Porcelain (e.g. "git am") and a call to this
 111 # function in the latter will keep the name of the end-user facing
 112 # program (e.g. "rebase") in GIT_REFLOG_ACTION, ensuring whatever it
 113 # does will be record as actions done as part of the end-user facing
 114 # operation (e.g. "rebase").
 115 #
 116 # NOTE NOTE NOTE: consequently, after assigning a specific message to
 117 # GIT_REFLOG_ACTION when calling a "git" command to record a custom
 118 # reflog message, do not leave that custom value in GIT_REFLOG_ACTION,
 119 # after you are done.  Other callers of "git" commands that rely on
 120 # writing the default "program name" in reflog expect the variable to
 121 # contain the value set by this function.
 122 #
 123 # To use a custom reflog message, do either one of these three:
 124 #
 125 # (a) use a single-shot export form:
 126 #     GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: preparing frotz" \
 127 #         git command-that-updates-a-ref
 128 #
 129 # (b) save the original away and restore:
 130 #     SAVED_ACTION=$GIT_REFLOG_ACTION
 131 #     GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: preparing frotz"
 132 #     git command-that-updates-a-ref
 133 #     GIT_REFLOG_ACITON=$SAVED_ACTION
 134 #
 135 # (c) assign the variable in a subshell:
 136 #     (
 137 #         GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: preparing frotz"
 138 #         git command-that-updates-a-ref
 139 #     )
 140 set_reflog_action() {
 141         if [ -z "${GIT_REFLOG_ACTION:+set}" ]
 142         then
 143                 GIT_REFLOG_ACTION="$*"
 144                 export GIT_REFLOG_ACTION
 145         fi
 146 }
 147
 148 git_editor() {
 149         if test -z "${GIT_EDITOR:+set}"
 150         then
 151                 GIT_EDITOR="$(git var GIT_EDITOR)" || return $?
 152         fi
 153
 154         eval "$GIT_EDITOR" '"$@"'
 155 }
 156
 157 git_pager() {
 158         if test -t 1
 159         then
 160                 GIT_PAGER=$(git var GIT_PAGER)
 161         else
 162                 GIT_PAGER=cat
 163         fi
 164         : ${LESS=-FRSX}
 165         export LESS
 166
 167         eval "$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 }