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_reflog_action() {
 107         if [ -z "${GIT_REFLOG_ACTION:+set}" ]
 108         then
 109                 GIT_REFLOG_ACTION="$*"
 110                 export GIT_REFLOG_ACTION
 111         fi
 112 }
 113
 114 git_editor() {
 115         if test -z "${GIT_EDITOR:+set}"
 116         then
 117                 GIT_EDITOR="$(git var GIT_EDITOR)" || return $?
 118         fi
 119
 120         eval "$GIT_EDITOR" '"$@"'
 121 }
 122
 123 git_pager() {
 124         if test -t 1
 125         then
 126                 GIT_PAGER=$(git var GIT_PAGER)
 127         else
 128                 GIT_PAGER=cat
 129         fi
 130         : ${LESS=-FRSX}
 131         export LESS
 132
 133         eval "$GIT_PAGER" '"$@"'
 134 }
 135
 136 sane_grep () {
 137         GREP_OPTIONS= LC_ALL=C grep "$@"
 138 }
 139
 140 sane_egrep () {
 141         GREP_OPTIONS= LC_ALL=C egrep "$@"
 142 }
 143
 144 is_bare_repository () {
 145         git rev-parse --is-bare-repository
 146 }
 147
 148 cd_to_toplevel () {
 149         cdup=$(git rev-parse --show-toplevel) &&
 150         cd "$cdup" || {
 151                 echo >&2 "Cannot chdir to $cdup, the toplevel of the working tree"
 152                 exit 1
 153         }
 154 }
 155
 156 require_work_tree_exists () {
 157         if test "z$(git rev-parse --is-bare-repository)" != zfalse
 158         then
 159                 die "fatal: $0 cannot be used without a working tree."
 160         fi
 161 }
 162
 163 require_work_tree () {
 164         test "$(git rev-parse --is-inside-work-tree 2>/dev/null)" = true ||
 165         die "fatal: $0 cannot be used without a working tree."
 166 }
 167
 168 require_clean_work_tree () {
 169         git rev-parse --verify HEAD >/dev/null || exit 1
 170         git update-index -q --ignore-submodules --refresh
 171         err=0
 172
 173         if ! git diff-files --quiet --ignore-submodules
 174         then
 175                 echo >&2 "Cannot $1: You have unstaged changes."
 176                 err=1
 177         fi
 178
 179         if ! git diff-index --cached --quiet --ignore-submodules HEAD --
 180         then
 181                 if [ $err = 0 ]
 182                 then
 183                     echo >&2 "Cannot $1: Your index contains uncommitted changes."
 184                 else
 185                     echo >&2 "Additionally, your index contains uncommitted changes."
 186                 fi
 187                 err=1
 188         fi
 189
 190         if [ $err = 1 ]
 191         then
 192                 test -n "$2" && echo >&2 "$2"
 193                 exit 1
 194         fi
 195 }
 196
 197 # Generate a sed script to parse identities from a commit.
 198 #
 199 # Reads the commit from stdin, which should be in raw format (e.g., from
 200 # cat-file or "--pretty=raw").
 201 #
 202 # The first argument specifies the ident line to parse (e.g., "author"), and
 203 # the second specifies the environment variable to put it in (e.g., "AUTHOR"
 204 # for "GIT_AUTHOR_*"). Multiple pairs can be given to parse author and
 205 # committer.
 206 pick_ident_script () {
 207         while test $# -gt 0
 208         do
 209                 lid=$1; shift
 210                 uid=$1; shift
 211                 printf '%s' "
 212                 /^$lid /{
 213                         s/'/'\\\\''/g
 214                         h
 215                         s/^$lid "'\([^<]*\) <[^>]*> .*$/\1/'"
 216                         s/.*/GIT_${uid}_NAME='&'/p
 217
 218                         g
 219                         s/^$lid "'[^<]* <\([^>]*\)> .*$/\1/'"
 220                         s/.*/GIT_${uid}_EMAIL='&'/p
 221
 222                         g
 223                         s/^$lid "'[^<]* <[^>]*> \(.*\)$/@\1/'"
 224                         s/.*/GIT_${uid}_DATE='&'/p
 225                 }
 226                 "
 227         done
 228         echo '/^$/q'
 229 }
 230
 231 # Create a pick-script as above and feed it to sed. Stdout is suitable for
 232 # feeding to eval.
 233 parse_ident_from_commit () {
 234         LANG=C LC_ALL=C sed -ne "$(pick_ident_script "$@")"
 235 }
 236
 237 # Parse the author from a commit given as an argument. Stdout is suitable for
 238 # feeding to eval to set the usual GIT_* ident variables.
 239 get_author_ident_from_commit () {
 240         encoding=$(git config i18n.commitencoding || echo UTF-8)
 241         git show -s --pretty=raw --encoding="$encoding" "$1" -- |
 242         parse_ident_from_commit author AUTHOR
 243 }
 244
 245 # Clear repo-local GIT_* environment variables. Useful when switching to
 246 # another repository (e.g. when entering a submodule). See also the env
 247 # list in git_connect()
 248 clear_local_git_env() {
 249         unset $(git rev-parse --local-env-vars)
 250 }
 251
 252 # Generate a virtual base file for a two-file merge. Uses git apply to
 253 # remove lines from $1 that are not in $2, leaving only common lines.
 254 create_virtual_base() {
 255         sz0=$(wc -c <"$1")
 256         @@DIFF@@ -u -La/"$1" -Lb/"$1" "$1" "$2" | git apply --no-add
 257         sz1=$(wc -c <"$1")
 258
 259         # If we do not have enough common material, it is not
 260         # worth trying two-file merge using common subsections.
 261         expr $sz0 \< $sz1 \* 2 >/dev/null || : >"$1"
 262 }
 263
 264
 265 # Platform specific tweaks to work around some commands
 266 case $(uname -s) in
 267 *MINGW*)
 268         # Windows has its own (incompatible) sort and find
 269         sort () {
 270                 /usr/bin/sort "$@"
 271         }
 272         find () {
 273                 /usr/bin/find "$@"
 274         }
 275         # git sees Windows-style pwd
 276         pwd () {
 277                 builtin pwd -W
 278         }
 279         is_absolute_path () {
 280                 case "$1" in
 281                 [/\\]* | [A-Za-z]:*)
 282                         return 0 ;;
 283                 esac
 284                 return 1
 285         }
 286         ;;
 287 *)
 288         is_absolute_path () {
 289                 case "$1" in
 290                 /*)
 291                         return 0 ;;
 292                 esac
 293                 return 1
 294         }
 295 esac
 296
 297 # Make sure we are in a valid repository of a vintage we understand,
 298 # if we require to be in a git repository.
 299 if test -z "$NONGIT_OK"
 300 then
 301         GIT_DIR=$(git rev-parse --git-dir) || exit
 302         if [ -z "$SUBDIRECTORY_OK" ]
 303         then
 304                 test -z "$(git rev-parse --show-cdup)" || {
 305                         exit=$?
 306                         echo >&2 "You need to run this command from the toplevel of the working tree."
 307                         exit $exit
 308                 }
 309         fi
 310         test -n "$GIT_DIR" && GIT_DIR=$(cd "$GIT_DIR" && pwd) || {
 311                 echo >&2 "Unable to determine absolute path of git directory"
 312                 exit 1
 313         }
 314         : ${GIT_OBJECT_DIRECTORY="$GIT_DIR/objects"}
 315 fi
 316
 317 peel_committish () {
 318         case "$1" in
 319         :/*)
 320                 peeltmp=$(git rev-parse --verify "$1") &&
 321                 git rev-parse --verify "${peeltmp}^0"
 322                 ;;
 323         *)
 324                 git rev-parse --verify "${1}^0"
 325                 ;;
 326         esac
 327 }