Implement (initial) support for fake bare git repositories

Fake bare git repositories are non-bare git repositories with a detached
worktree. Thus, they require core.worktree set in the configuration. The
current implementation assumes that such repositories are named foo.git.

So far, support has only been added for register, update, log, and
status. Specifically diff and commit do not work yet.

diff --git a/mr b/mr
index 84f1a58a6abc878ddd6efa558d83e0a3948a91a5..b26802738f284d84e53c7f0d3536e488e11dc2cd 100755 (executable)
--- a/mr
+++ b/mr
@@ -960,12 +960,15 @@ lib =
 update =
        if [ -d "$MR_REPO"/.svn ]; then
                svn update "$@"
-       elif [ -d "$MR_REPO"/.git ]; then
+       elif [ -d "$MR_REPO"/.git ] || [ "${MR_REPO%.git/}" != "$MR_REPO" ]; then
+               # this is a bug in git-fetch, which requires GIT_DIR set
+               [ "${MR_REPO%.git/}" != "$MR_REPO" ] && GIT_DIR="$MR_REPO" && export GIT_DIR
                if [ -z "$@" ]; then
                        git pull -t origin master
                else
                        git pull "$@"
                fi
+               unset GIT_DIR
        elif [ -d "$MR_REPO"/.bzr ]; then
                bzr merge "$@"
        elif [ -d "$MR_REPO"/CVS ]; then
@@ -980,7 +983,7 @@ update =
 status =
        if [ -d "$MR_REPO"/.svn ]; then
                svn status "$@"
-       elif [ -d "$MR_REPO"/.git ]; then
+       elif [ -d "$MR_REPO"/.git ] || [ "${MR_REPO%.git/}" != "$MR_REPO" ]; then
                git status "$@" || true
        elif [ -d "$MR_REPO"/.bzr ]; then
                bzr status "$@"
@@ -998,6 +1001,8 @@ commit =
                svn commit "$@"
        elif [ -d "$MR_REPO"/.git ]; then
                git commit -a "$@" && git push --all
+       elif [ "${MR_REPO%.git/}" != "$MR_REPO" ]; then
+               error "commit does not work for fake bare git repositories (yet)."
        elif [ -d "$MR_REPO"/.bzr ]; then
                bzr commit "$@" && bzr push
        elif [ -d "$MR_REPO"/CVS ]; then
@@ -1014,6 +1019,8 @@ diff =
                svn diff "$@"
        elif [ -d "$MR_REPO"/.git ]; then
                git diff "$@"
+       elif [ "${MR_REPO%.git/}" != "$MR_REPO" ]; then
+               error "commit does not work for fake bare git repositories (yet)."
        elif [ -d "$MR_REPO"/.bzr ]; then
                bzr diff "$@"
        elif [ -d "$MR_REPO"/CVS ]; then
@@ -1028,7 +1035,7 @@ diff =
 log =
        if [ -d "$MR_REPO"/.svn ]; then
                svn log"$@"
-       elif [ -d "$MR_REPO"/.git ]; then
+       elif [ -d "$MR_REPO"/.git ] || [ "${MR_REPO%.git/}" != "$MR_REPO" ]; then
                git log "$@"
        elif [ -d "$MR_REPO"/.bzr ]; then
                bzr log "$@"
@@ -1053,12 +1060,37 @@ register =
                fi
                echo "Registering svn url: $url in $MR_CONFIG"
                mr -c "$MR_CONFIG" config "$(pwd)" checkout="svn co $url $basedir"
-       elif [ -d .git ]; then
-               url=$(LANG=C git-config --get remote.origin.url)
+       elif [ -d .git ] || [ "${basedir%.git}" != "$basedir" ]; then
+               GIT_CONFIG=.git/config
+               [ ! -f $GIT_CONFIG ] && GIT_CONFIG=config
+               export GIT_CONFIG
+               url="$(LANG=C git-config --get remote.origin.url)"
                if [ -z "$url" ]; then
                        error "cannot determine git url"
                fi
-               echo "Registering git url: $url in $MR_CONFIG"
+               if [ $GIT_CONFIG = config ]; then
+                       # this seems like a bare repo as it has no worktree.
+                       # mr needs a worktree and cannot work with bare
+                       # repositories, so ensure that it's "fake bare" and
+                       # has a worktree configured.
+                       case "$(git-config --get core.bare)" in
+                               true) error "cannot register a bare git repository";;
+                       esac
+                       GIT_WORK_TREE="$(git-config --get core.worktree)" || :
+                       case "$GIT_WORK_TREE" in
+                               '') error "cannot register a fake bare git repository without core.worktree";;
+                               *)
+                                       if [ ! -d "$GIT_WORK_TREE" ]; then
+                                               error "git worktree $GIT_WORK_TREE does not exist"
+                                       fi;;
+                       esac
+                       suffix=" (with worktree $GIT_WORK_TREE)"
+                       mr -c "$MR_CONFIG" config "$(pwd)" \
+                               lib="GIT_WORK_TREE=$GIT_WORK_TREE; export GIT_WORK_TREE"
+                       unset GIT_WORK_TREE
+               fi
+               echo "Registering git url: $url in $MR_CONFIG${suffix:-}"
+               unset GIT_CONFIG
                mr -c "$MR_CONFIG" config "$(pwd)" checkout="git clone $url $basedir"
        elif [ -d .bzr ]; then
                url=$(cat .bzr/branch/parent)