diff options
| -rwxr-xr-x | bin/fetchgit | 71 |
1 files changed, 57 insertions, 14 deletions
diff --git a/bin/fetchgit b/bin/fetchgit index b9fe90854..293cc31f3 100755 --- a/bin/fetchgit +++ b/bin/fetchgit @@ -1,25 +1,68 @@ #! /bin/sh -# usage: fetchgit REVISION URL WORKTREE +# +# usage: fetchgit git_rev git_url out_link +# +# Clone the specified Git repository and make it available as out_link. +# set -euf git_rev=$1 git_url=$2 -worktree=$3 +out_link=$3 -if [ ! -d "$worktree" ]; then - mkdir -p "$worktree" -fi +# Put all bases in the same place as out_link. +# Notice how out_link must not clash with cache_dir and work_dir. +cache_base=$(dirname "$out_link") +work_base=$(dirname "$out_link") -cd "$worktree" +# cache_dir points to a (maybe non-existent) directory, where a shared cache of +# the repository should be maintained. The shared cache is used to create +# multiple working trees of the repository. +cache_dir=$cache_base/$(echo "$git_url" | urlencode) -git init -q +# work_dir points to a (maybe non-existent) directory, where a specific +# revision of the repository is checked out. +work_dir=$work_base/$(echo "$git_rev") -if ! current_url=$(git config remote.src.url); then - git remote add src "$git_url" -elif [ "$current_url" != "$git_url" ]; then - git remote set-url src "$git_url" -fi +cache_git() { + git --git-dir="$cache_dir" "$@" +} + +work_git() { + git -C "$work_dir" "$@" +} -git fetch src +is_up_to_date() { + test -d "$cache_dir" && + test -d "$work_dir" && + test "$(work_git rev-parse HEAD)" = "$git_rev" +} -git checkout "$git_rev" +if ! is_up_to_date; then + if ! test -d "$cache_dir"; then + mkdir -p "$cache_dir" + cache_git init --bare + fi + if ! cache_git_url=$(cache_git config remote.origin.url); then + cache_git remote add origin "$git_url" + elif test "$cache_git_url" != "$git_url"; then + cache_git remote set-url origin "$git_url" + fi + cache_git fetch origin + if ! test -d "$work_dir"; then + git clone -n --shared "$cache_dir" "$work_dir" + fi + work_git checkout "$git_rev" -- "$(readlink -f "$work_dir")" + work_git checkout -b master "$git_rev" + work_git submodule init + work_git submodule update +fi +work_git clean -dxf + +# Relative links are nicer, and actually we know that work_dir and out_link are +# the same. But, for robustness, check anyway.. :) +if test "$(dirname "$work_dir")" = "$(dirname "$out_link")"; then + ln -snf "$(basename "$work_dir")" "$out_link" +else + ln -snf "$work_dir" "$out_link" +fi |