update buildroot to 2017.02.11

bsp/buildroot-2017.02.11/support/download/git

@@ -0,0 +1,101 @@
+#!/usr/bin/env bash
+
+# We want to catch any unexpected failure, and exit immediately
+set -e
+
+# Download helper for git, to be called from the download wrapper script
+#
+# Call it as:
+#   .../git [-q] [-r] OUT_FILE REPO_URL CSET BASENAME
+#
+#   -q  Be quiet.
+#   -r  Clone and archive sub-modules.
+#
+# Environment:
+#   GIT      : the git command to call
+
+verbose=
+recurse=0
+while getopts :qr OPT; do
+    case "${OPT}" in
+    q)  verbose=-q; exec >/dev/null;;
+    r)  recurse=1;;
+    \?) printf "unknown option '%s'\n" "${OPTARG}" >&2; exit 1;;
+    esac
+done
+shift $((OPTIND-1))
+
+output="${1}"
+repo="${2}"
+cset="${3}"
+basename="${4}"
+
+shift 4 # Get rid of our options
+
+# Caller needs to single-quote its arguments to prevent them from
+# being expanded a second time (in case there are spaces in them)
+_git() {
+    eval ${GIT} "${@}"
+}
+
+# Try a shallow clone, since it is faster than a full clone - but that only
+# works if the version is a ref (tag or branch). Before trying to do a shallow
+# clone we check if ${cset} is in the list provided by git ls-remote. If not
+# we fall back on a full clone.
+#
+# Messages for the type of clone used are provided to ease debugging in case of
+# problems
+git_done=0
+if [ -n "$(_git ls-remote "'${repo}'" "'${cset}'" 2>&1)" ]; then
+    printf "Doing shallow clone\n"
+    if _git clone ${verbose} "${@}" --depth 1 -b "'${cset}'" "'${repo}'" "'${basename}'"; then
+        git_done=1
+    else
+        printf "Shallow clone failed, falling back to doing a full clone\n"
+    fi
+fi
+if [ ${git_done} -eq 0 ]; then
+    printf "Doing full clone\n"
+    _git clone ${verbose} "${@}" "'${repo}'" "'${basename}'"
+fi
+
+pushd "${basename}" >/dev/null
+
+# Try to get the special refs exposed by some forges (pull-requests for
+# github, changes for gerrit...). There is no easy way to know whether
+# the cset the user passed us is such a special ref or a tag or a sha1
+# or whatever else. We'll eventually fail at checking out that cset,
+# below, if there is an issue anyway. Since most of the cset we're gonna
+# have to clone are not such special refs, consign the output to oblivion
+# so as not to alarm unsuspecting users, but still trace it as a warning.
+if ! _git fetch origin "'${cset}:${cset}'" >/dev/null 2>&1; then
+    printf "Could not fetch special ref '%s'; assuming it is not special.\n" "${cset}"
+fi
+
+# Checkout the required changeset, so that we can update the required
+# submodules.
+_git checkout -q "'${cset}'"
+
+# Get date of commit to generate a reproducible archive.
+# %cD is RFC2822, so it's fully qualified, with TZ and all.
+date="$( _git log -1 --pretty=format:%cD )"
+
+# There might be submodules, so fetch them.
+if [ ${recurse} -eq 1 ]; then
+    _git submodule update --init --recursive
+fi
+
+# We do not need the .git dir; we keep other .git files, in case they
+# are the only files in their directory.
+rm -rf .git
+
+popd >/dev/null
+
+# Generate the archive, sort with the C locale so that it is reproducible
+find "${basename}" -not -type d >"${basename}.list"
+LC_ALL=C sort <"${basename}.list" >"${basename}.list.sorted"
+# Create GNU-format tarballs, since that's the format of the tarballs on
+# sources.buildroot.org and used in the *.hash files
+tar cf - --numeric-owner --owner=0 --group=0 --mtime="${date}" --format=gnu \
+         -T "${basename}.list.sorted" >"${output}.tar"
+gzip -6 -n <"${output}.tar" >"${output}"