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#!/bin/sh
info() { printf >&2 %s\\n "$*" ; }
die() { info "$*" ; exit 1 ; }
ensure_HEAD() {
[ "$1" = 'POST_GIT' ] || die "unsupported trigger '$1'"
cd "$GL_REPO_BASE/$2.git"
# everything OK if the default in HEAD points to a real branch
git show-ref --quiet --verify "$(git symbolic-ref HEAD)" && return 0
# there *might* be a mismatch, so let's find out a real branch
local head
head="$(git show-ref --heads | head -1 | sed -e 's/^.* //')"
# the repo might still be empty
[ -n "$head" ] || return 0
# we have a default branch that we can set here
info "setting HEAD to <$head>"
git symbolic-ref HEAD "$head" -m "Default HEAD to branch <$head>"
}
set -eu
ensure_HEAD "$@"
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