"git submodule add" initializes the name of a submodule to its path. This
was ok as long as the .git directory lived inside the submodule's work
tree, but since 1.7.8 it is stored in the .git/modules/<name> directory of
the superproject, making the submodule name survive the removal of the
submodule's work tree. This leads to problems when the user tries to add a
different submodule at the same path - and thus the same name - later, as
that will happily try to restore the submodule from the old repository
instead of the one the user specified and will lead to a checkout of the
wrong repository.

Add the new "--name" option to let the user provide a name for the
submodule. This enables the user to solve this conflict without having to
remove .git/modules/<name> by hand (which is no viable solution as it
makes it impossible to checkout a commit that records the old submodule
and populate it, as that will still check out the new submodule for the
same reason).

To achieve that the submodule's name is added to the parameter list of
the module_clone() helper function. This makes it possible to remove the
call of module_name() there because both callers of module_clone() already
know the name and can provide it as argument number two.

Reported-by: Jonathan Johnson <m...@jondavidjohn.com>
Signed-off-by: Jens Lehmann <jens.lehm...@web.de>
---
 Documentation/git-submodule.txt |  7 ++++++-
 Documentation/gitmodules.txt    |  4 +++-
 git-submodule.sh                | 32 ++++++++++++++++++++---------
 t/t7400-submodule-basic.sh      | 45 +++++++++++++++++++++++++++++++++++++++++
 4 files changed, 76 insertions(+), 12 deletions(-)

diff --git a/Documentation/git-submodule.txt b/Documentation/git-submodule.txt
index 2de7bf0..22efca0 100644
--- a/Documentation/git-submodule.txt
+++ b/Documentation/git-submodule.txt
@@ -9,7 +9,7 @@ git-submodule - Initialize, update or inspect submodules
 SYNOPSIS
 --------
 [verse]
-'git submodule' [--quiet] add [-b branch] [-f|--force]
+'git submodule' [--quiet] add [-b branch] [-f|--force] [--name <name>]
              [--reference <repository>] [--] <repository> [<path>]
 'git submodule' [--quiet] status [--cached] [--recursive] [--] [<path>...]
 'git submodule' [--quiet] init [--] [<path>...]
@@ -266,6 +266,11 @@ OPTIONS
        Initialize all submodules for which "git submodule init" has not been
        called so far before updating.

+--name::
+       This option is only valid for the add command. It sets the submodule's
+       name to the given string instead of defaulting to its path. The name
+       must be valid as a directory name and may not end with a '/'.
+
 --reference <repository>::
        This option is only valid for add and update commands.  These
        commands sometimes need to clone a remote repository. In this case,
diff --git a/Documentation/gitmodules.txt b/Documentation/gitmodules.txt
index 4effd78..ab3e91c 100644
--- a/Documentation/gitmodules.txt
+++ b/Documentation/gitmodules.txt
@@ -18,7 +18,9 @@ working tree, is a text file with a syntax matching the 
requirements
 of linkgit:git-config[1].

 The file contains one subsection per submodule, and the subsection value
-is the name of the submodule. Each submodule section also contains the
+is the name of the submodule. The name is set to the path where the
+submodule has been added unless it was customized with the '--name'
+option of 'git submodule add'. Each submodule section also contains the
 following required keys:

 submodule.<name>.path::
diff --git a/git-submodule.sh b/git-submodule.sh
index 3e2045e..22febb1 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -5,7 +5,7 @@
 # Copyright (c) 2007 Lars Hjemli

 dashless=$(basename "$0" | sed -e 's/-/ /')
-USAGE="[--quiet] add [-b branch] [-f|--force] [--reference <repository>] [--] 
<repository> [<path>]
+USAGE="[--quiet] add [-b branch] [-f|--force] [--name <name>] [--reference 
<repository>] [--] <repository> [<path>]
    or: $dashless [--quiet] status [--cached] [--recursive] [--] [<path>...]
    or: $dashless [--quiet] init [--] [<path>...]
    or: $dashless [--quiet] update [--init] [-N|--no-fetch] [-f|--force] 
[--rebase] [--reference <repository>] [--merge] [--recursive] [--] [<path>...]
@@ -29,6 +29,7 @@ files=
 nofetch=
 update=
 prefix=
+custom_name=

 # The function takes at most 2 arguments. The first argument is the
 # URL that navigates to the submodule origin repo. When relative, this URL
@@ -179,8 +180,9 @@ module_name()
 module_clone()
 {
        sm_path=$1
-       url=$2
-       reference="$3"
+       name=$2
+       url=$3
+       reference="$4"
        quiet=
        if test -n "$GIT_QUIET"
        then
@@ -189,8 +191,6 @@ module_clone()

        gitdir=
        gitdir_base=
-       name=$(module_name "$sm_path" 2>/dev/null)
-       test -n "$name" || name="$sm_path"
        base_name=$(dirname "$name")

        gitdir=$(git rev-parse --git-dir)
@@ -272,6 +272,11 @@ cmd_add()
                        reference="$1"
                        shift
                        ;;
+               --name)
+                       case "$2" in '') usage ;; esac
+                       custom_name=$2
+                       shift
+                       ;;
                --)
                        shift
                        break
@@ -336,6 +341,13 @@ Use -f if you really want to add it." >&2
                exit 1
        fi

+       if test -n "$custom_name"
+       then
+               sm_name="$custom_name"
+       else
+               sm_name="$sm_path"
+       fi
+
        # perhaps the path exists and is already a git repo, else clone it
        if test -e "$sm_path"
        then
@@ -348,7 +360,7 @@ Use -f if you really want to add it." >&2

        else

-               module_clone "$sm_path" "$realrepo" "$reference" || exit
+               module_clone "$sm_path" "$sm_name" "$realrepo" "$reference" || 
exit
                (
                        clear_local_git_env
                        cd "$sm_path" &&
@@ -359,13 +371,13 @@ Use -f if you really want to add it." >&2
                        esac
                ) || die "$(eval_gettext "Unable to checkout submodule 
'\$sm_path'")"
        fi
-       git config submodule."$sm_path".url "$realrepo"
+       git config submodule."$sm_name".url "$realrepo"

        git add $force "$sm_path" ||
        die "$(eval_gettext "Failed to add submodule '\$sm_path'")"

-       git config -f .gitmodules submodule."$sm_path".path "$sm_path" &&
-       git config -f .gitmodules submodule."$sm_path".url "$repo" &&
+       git config -f .gitmodules submodule."$sm_name".path "$sm_path" &&
+       git config -f .gitmodules submodule."$sm_name".url "$repo" &&
        git add --force .gitmodules ||
        die "$(eval_gettext "Failed to register submodule '\$sm_path'")"
 }
@@ -594,7 +606,7 @@ Maybe you want to use 'update --init'?")"

                if ! test -d "$sm_path"/.git -o -f "$sm_path"/.git
                then
-                       module_clone "$sm_path" "$url" "$reference"|| exit
+                       module_clone "$sm_path" "$name" "$url" "$reference" || 
exit
                        cloned_modules="$cloned_modules;$name"
                        subsha1=
                else
diff --git a/t/t7400-submodule-basic.sh b/t/t7400-submodule-basic.sh
index 56a81cd..78bf739 100755
--- a/t/t7400-submodule-basic.sh
+++ b/t/t7400-submodule-basic.sh
@@ -681,4 +681,49 @@ test_expect_success 'moving the superproject does not 
break submodules' '
        )
 '

+test_expect_success 'submodule add --name allows to replace a submodule with 
another at the same path' '
+       (
+               cd addtest2 &&
+               (
+                       cd repo &&
+                       echo "$submodurl/repo" >expect &&
+                       git config remote.origin.url >actual &&
+                       test_cmp expect actual &&
+                       echo "gitdir: ../.git/modules/repo" >expect &&
+                       test_cmp expect .git
+               ) &&
+               rm -rf repo &&
+               git rm repo &&
+               git submodule add -q --name repo_new "$submodurl/bare.git" repo 
>actual &&
+               test ! -s actual &&
+               echo "gitdir: ../.git/modules/submod" >expect &&
+               test_cmp expect submod/.git &&
+               (
+                       cd repo &&
+                       echo "$submodurl/bare.git" >expect &&
+                       git config remote.origin.url >actual &&
+                       test_cmp expect actual &&
+                       echo "gitdir: ../.git/modules/repo_new" >expect &&
+                       test_cmp expect .git
+               ) &&
+               echo "repo" >expect &&
+               git config -f .gitmodules submodule.repo.path >actual &&
+               test_cmp expect actual &&
+               git config -f .gitmodules submodule.repo_new.path >actual &&
+               test_cmp expect actual&&
+               echo "$submodurl/repo" >expect &&
+               git config -f .gitmodules submodule.repo.url >actual &&
+               test_cmp expect actual &&
+               echo "$submodurl/bare.git" >expect &&
+               git config -f .gitmodules submodule.repo_new.url >actual &&
+               test_cmp expect actual &&
+               echo "$submodurl/repo" >expect &&
+               git config submodule.repo.url >actual &&
+               test_cmp expect actual &&
+               echo "$submodurl/bare.git" >expect &&
+               git config submodule.repo_new.url >actual &&
+               test_cmp expect actual
+       )
+'
+
 test_done
-- 
1.7.12.1.430.g4fd6dc4


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