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 # Source git-sh-i18n for gettext support.
  47 . "$(git --exec-path)/git-sh-i18n"
  48
  49 die () {
  50         die_with_status 1 "$@"
  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         [ -n "$OPTIONS_STUCKLONG" ] &&
  79                 parseopt_extra="$parseopt_extra --stuck-long"
  80
  81         eval "$(
  82                 echo "$OPTIONS_SPEC" |
  83                         git rev-parse --parseopt $parseopt_extra -- "$@" ||
  84                 echo exit $?
  85         )"
  86 else
  87         dashless=$(basename -- "$0" | sed -e 's/-/ /')
  88         usage() {
  89                 die "$(eval_gettext "usage: \$dashless \$USAGE")"
  90         }
  91
  92         if [ -z "$LONG_USAGE" ]
  93         then
  94                 LONG_USAGE="$(eval_gettext "usage: \$dashless \$USAGE")"
  95         else
  96                 LONG_USAGE="$(eval_gettext "usage: \$dashless \$USAGE
  97
  98 $LONG_USAGE")"
  99         fi
 100
 101         case "$1" in
 102                 -h)
 103                 echo "$LONG_USAGE"
 104                 case "$0" in *git-legacy-stash) exit 129;; esac
 105                 exit
 106         esac
 107 fi
 108
 109 # Set the name of the end-user facing command in the reflog when the
 110 # script may update refs.  When GIT_REFLOG_ACTION is already set, this
 111 # will not overwrite it, so that a scripted Porcelain (e.g. "git
 112 # rebase") can set it to its own name (e.g. "rebase") and then call
 113 # another scripted Porcelain (e.g. "git am") and a call to this
 114 # function in the latter will keep the name of the end-user facing
 115 # program (e.g. "rebase") in GIT_REFLOG_ACTION, ensuring whatever it
 116 # does will be record as actions done as part of the end-user facing
 117 # operation (e.g. "rebase").
 118 #
 119 # NOTE NOTE NOTE: consequently, after assigning a specific message to
 120 # GIT_REFLOG_ACTION when calling a "git" command to record a custom
 121 # reflog message, do not leave that custom value in GIT_REFLOG_ACTION,
 122 # after you are done.  Other callers of "git" commands that rely on
 123 # writing the default "program name" in reflog expect the variable to
 124 # contain the value set by this function.
 125 #
 126 # To use a custom reflog message, do either one of these three:
 127 #
 128 # (a) use a single-shot export form:
 129 #     GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: preparing frotz" \
 130 #         git command-that-updates-a-ref
 131 #
 132 # (b) save the original away and restore:
 133 #     SAVED_ACTION=$GIT_REFLOG_ACTION
 134 #     GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: preparing frotz"
 135 #     git command-that-updates-a-ref
 136 #     GIT_REFLOG_ACITON=$SAVED_ACTION
 137 #
 138 # (c) assign the variable in a subshell:
 139 #     (
 140 #         GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: preparing frotz"
 141 #         git command-that-updates-a-ref
 142 #     )
 143 set_reflog_action() {
 144         if [ -z "${GIT_REFLOG_ACTION:+set}" ]
 145         then
 146                 GIT_REFLOG_ACTION="$*"
 147                 export GIT_REFLOG_ACTION
 148         fi
 149 }
 150
 151 git_editor() {
 152         if test -z "${GIT_EDITOR:+set}"
 153         then
 154                 GIT_EDITOR="$(git var GIT_EDITOR)" || return $?
 155         fi
 156
 157         eval "$GIT_EDITOR" '"$@"'
 158 }
 159
 160 git_pager() {
 161         if test -t 1
 162         then
 163                 GIT_PAGER=$(git var GIT_PAGER)
 164         else
 165                 GIT_PAGER=cat
 166         fi
 167         for vardef in @@PAGER_ENV@@
 168         do
 169                 var=${vardef%%=*}
 170                 eval ": \"\${$vardef}\" && export $var"
 171         done
 172
 173         eval "$GIT_PAGER" '"$@"'
 174 }
 175
 176 is_bare_repository () {
 177         git rev-parse --is-bare-repository
 178 }
 179
 180 cd_to_toplevel () {
 181         cdup=$(git rev-parse --show-toplevel) &&
 182         cd "$cdup" || {
 183                 gettextln "Cannot chdir to \$cdup, the toplevel of the working tree" >&2
 184                 exit 1
 185         }
 186 }
 187
 188 require_work_tree_exists () {
 189         if test "z$(git rev-parse --is-bare-repository)" != zfalse
 190         then
 191                 program_name=$0
 192                 die "$(eval_gettext "fatal: \$program_name cannot be used without a working tree.")"
 193         fi
 194 }
 195
 196 require_work_tree () {
 197         test "$(git rev-parse --is-inside-work-tree 2>/dev/null)" = true || {
 198                 program_name=$0
 199                 die "$(eval_gettext "fatal: \$program_name cannot be used without a working tree.")"
 200         }
 201 }
 202
 203 require_clean_work_tree () {
 204         git rev-parse --verify HEAD >/dev/null || exit 1
 205         git update-index -q --ignore-submodules --refresh
 206         err=0
 207
 208         if ! git diff-files --quiet --ignore-submodules
 209         then
 210                 action=$1
 211                 case "$action" in
 212                 "rewrite branches")
 213                         gettextln "Cannot rewrite branches: You have unstaged changes." >&2
 214                         ;;
 215                 *)
 216                         eval_gettextln "Cannot \$action: You have unstaged changes." >&2
 217                         ;;
 218                 esac
 219                 err=1
 220         fi
 221
 222         if ! git diff-index --cached --quiet --ignore-submodules HEAD --
 223         then
 224                 if test $err = 0
 225                 then
 226                         action=$1
 227                         eval_gettextln "Cannot \$action: Your index contains uncommitted changes." >&2
 228                 else
 229                     gettextln "Additionally, your index contains uncommitted changes." >&2
 230                 fi
 231                 err=1
 232         fi
 233
 234         if test $err = 1
 235         then
 236                 test -n "$2" && echo "$2" >&2
 237                 exit 1
 238         fi
 239 }
 240
 241 # Generate a sed script to parse identities from a commit.
 242 #
 243 # Reads the commit from stdin, which should be in raw format (e.g., from
 244 # cat-file or "--pretty=raw").
 245 #
 246 # The first argument specifies the ident line to parse (e.g., "author"), and
 247 # the second specifies the environment variable to put it in (e.g., "AUTHOR"
 248 # for "GIT_AUTHOR_*"). Multiple pairs can be given to parse author and
 249 # committer.
 250 pick_ident_script () {
 251         while test $# -gt 0
 252         do
 253                 lid=$1; shift
 254                 uid=$1; shift
 255                 printf '%s' "
 256                 /^$lid /{
 257                         s/'/'\\\\''/g
 258                         h
 259                         s/^$lid "'\([^<]*\) <[^>]*> .*$/\1/'"
 260                         s/.*/GIT_${uid}_NAME='&'/p
 261
 262                         g
 263                         s/^$lid "'[^<]* <\([^>]*\)> .*$/\1/'"
 264                         s/.*/GIT_${uid}_EMAIL='&'/p
 265
 266                         g
 267                         s/^$lid "'[^<]* <[^>]*> \(.*\)$/@\1/'"
 268                         s/.*/GIT_${uid}_DATE='&'/p
 269                 }
 270                 "
 271         done
 272         echo '/^$/q'
 273 }
 274
 275 # Create a pick-script as above and feed it to sed. Stdout is suitable for
 276 # feeding to eval.
 277 parse_ident_from_commit () {
 278         LANG=C LC_ALL=C sed -ne "$(pick_ident_script "$@")"
 279 }
 280
 281 # Parse the author from a commit given as an argument. Stdout is suitable for
 282 # feeding to eval to set the usual GIT_* ident variables.
 283 get_author_ident_from_commit () {
 284         encoding=$(git config i18n.commitencoding || echo UTF-8)
 285         git show -s --pretty=raw --encoding="$encoding" "$1" -- |
 286         parse_ident_from_commit author AUTHOR
 287 }
 288
 289 # Clear repo-local GIT_* environment variables. Useful when switching to
 290 # another repository (e.g. when entering a submodule). See also the env
 291 # list in git_connect()
 292 clear_local_git_env() {
 293         unset $(git rev-parse --local-env-vars)
 294 }
 295
 296 # Generate a virtual base file for a two-file merge. Uses git apply to
 297 # remove lines from $1 that are not in $2, leaving only common lines.
 298 create_virtual_base() {
 299         sz0=$(wc -c <"$1")
 300         @@DIFF@@ -u -La/"$1" -Lb/"$1" "$1" "$2" | git apply --no-add
 301         sz1=$(wc -c <"$1")
 302
 303         # If we do not have enough common material, it is not
 304         # worth trying two-file merge using common subsections.
 305         expr $sz0 \< $sz1 \* 2 >/dev/null || : >"$1"
 306 }
 307
 308
 309 # Platform specific tweaks to work around some commands
 310 case $(uname -s) in
 311 *MINGW*)
 312         # Windows has its own (incompatible) sort and find
 313         sort () {
 314                 /usr/bin/sort "$@"
 315         }
 316         find () {
 317                 /usr/bin/find "$@"
 318         }
 319         # git sees Windows-style pwd
 320         pwd () {
 321                 builtin pwd -W
 322         }
 323         is_absolute_path () {
 324                 case "$1" in
 325                 [/\\]* | [A-Za-z]:*)
 326                         return 0 ;;
 327                 esac
 328                 return 1
 329         }
 330         ;;
 331 *)
 332         is_absolute_path () {
 333                 case "$1" in
 334                 /*)
 335                         return 0 ;;
 336                 esac
 337                 return 1
 338         }
 339 esac
 340
 341 # Make sure we are in a valid repository of a vintage we understand,
 342 # if we require to be in a git repository.
 343 git_dir_init () {
 344         GIT_DIR=$(git rev-parse --git-dir) || exit
 345         if [ -z "$SUBDIRECTORY_OK" ]
 346         then
 347                 test -z "$(git rev-parse --show-cdup)" || {
 348                         exit=$?
 349                         gettextln "You need to run this command from the toplevel of the working tree." >&2
 350                         exit $exit
 351                 }
 352         fi
 353         test -n "$GIT_DIR" && GIT_DIR=$(cd "$GIT_DIR" && pwd) || {
 354                 gettextln "Unable to determine absolute path of git directory" >&2
 355                 exit 1
 356         }
 357         : "${GIT_OBJECT_DIRECTORY="$(git rev-parse --git-path objects)"}"
 358 }
 359
 360 if test -z "$NONGIT_OK"
 361 then
 362         git_dir_init
 363 fi
 364
 365 peel_committish () {
 366         case "$1" in
 367         :/*)
 368                 peeltmp=$(git rev-parse --verify "$1") &&
 369                 git rev-parse --verify "${peeltmp}^0"
 370                 ;;
 371         *)
 372                 git rev-parse --verify "${1}^0"
 373                 ;;
 374         esac
 375 }