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|
#! /bin/sh
#
# usage: lgoinstall
#
# This script tries to goinstall $PWD
#
# target=local/$(basename $PWD)
# ensure there's a symlink local/$target somewhere in $GOROOT or $GOPATH
# goinstall local/$(dirname $PWD)
#
set -euf
#fqtarget="$(readlink -f "$PWD")"
fqtarget="$PWD"
target="local/$(basename "$fqtarget")"
#
# resolve PATH [relpath [FS]] # ====> abspath...
#
# Resolve relpath to abspath for each component x separated by FS in PATH
# where x/relpath is an existing file.
#
# relpath defaults to ""
# FS defaults to ":"
#
# Example:
#
# resolve "/bin:/usr/bin" sh # ====> /bin/sh
#
resolve() {
set -- "$1" "${2+/$2}" "${3-:}" "$IFS"
IFS="$3"
for i in $1; do
! test -x "$i$2" || echo "$i$2"
done
unset i
IFS="$3"
}
#
# xargstest TEST_ARGS...
#
# Read filenames from stdin and
# write each filename that satisfies test # $TEST_ARGS to stdout.
#
# Each %x in TEST_ARGS gets replaced by the readlink -f of the filename.
#
# Example:
#
# xargstest -d %x <<EOF
# /bin/sh
# /usr
# EOF
# # ====> /usr
#
xargstest() {
while read x; do
fqx="$(readlink -f "$x")"
if sub %x "$x" sub %fqx "$fqx" test "$@"; then
#if test "${@//%x/$fqx}"; then
echo "$x"
fi
done | grep .
}
sub() {
sub1="$1"
sub2="$2"
shift 2
set -- "${@//$sub1/$sub2}"
unset sub1 sub2
"$@"
}
path="${GOROOT-}${GOPATH+:$GOPATH}"
#
# if there's a src/$target that points to $PWD, then succeed
#
if x="`resolve "$path" src/$target | xargstest "$fqtarget" = %fqx`"
then
echo "good $target: $x -> $PWD" >&2
exec goinstall "$target"
fi
#
# if there's some other src/$target then die
#
if x="`resolve "$path" src/$target | xargstest ! -x %x -o "$fqtarget" != %fqx`"
then
echo bad $target: $x >&2
echo check your GOROOT and/or GOPATH or eliminate that $target >&2
exit 23
fi
#
# if we've no Go-source in $PWD then die to prevent clobbering $GOPATH & co.
#
if ! ls | grep '\.go$'; then
echo "Your \$PWD seems to contain no Go-source... abort." >&2
exit 23
fi
#
# if we can write to some src/local then symlink $PWD and retry
#
if x="`resolve "$path" src/local | xargstest -w %x`"
then
#echo writable src/local: $x
ln -vsnf $fqtarget $x
exec "$0" "$@"
fi
#
# if we can write to some src then mkdir src/local and retry
#
if x="`resolve "$path" src | xargstest -w %x`"
then
#echo writable src: $x
mkdir "$x/local"
exec "$0" "$@"
fi
echo "This script failed: good luck, you're on your own!" >&2
exit 23
|
