Allow installation of spkgs whose names don't match their top-level directories.

[robertwb]

This is handy to be able to pull the archive directly from services such as github, e.g. ​https://github.com/user/project/archive/master.tar.gz

[robertwb]

New commits:

​56769ae

Install from arbitrary tarball with spkg-install script.

[jdemeyer]

Instead of grepping the output of tar tf -, I would prefer a simple shell script along the lines of

# Find the unique subdirectory name
PKG_SUBDIR=""
for d in *; do
    if [ -d "$d" ]; then
        if [ -z "$PKG_SUBDIR" ]; then
            PKG_SUBDIR="$d"
        else
            echo >&2 "Multiple directories in package, no idea what to do..."
            exit 1
        fi
    fi
done
if [ -z "$PKG_SUBDIR" ]; then
    echo >&2 "No directory found in package, no idea what to do..."
    exit 1
fi
cd "$PKG_SUBDIR" || exit $?

This also deals with the case that there are multiple directories, and there are less worries about portability of tar tf -.

[jdemeyer]

While you're at it, could you add 2>/dev/null to the mv command in

if [ "$USE_LOCAL_SCRIPTS" = yes ]; then
    shopt -s nocaseglob      # see trac:16415
    mv "${PKG_NAME_UPSTREAM%.tar*}"* src
    shopt -u nocaseglob
    echo "Finished set up"

[embray]

I think probably this can be closed as of #20721.

[embray]

I like to actually close tickets, so... I think I'll close as a duplicate of #20721 (even though this one came first).

[mkoeppe]

Thanks!