[Libguestfs] [PATCH 3/4] Call febootstrap-supermin-helper using the new -u and -g options

Use febootstrap-supermin-helper's new -u and -g command line options to setuid, rather than doing it in libguestfs. This resolves an issue with the generation of the cached appliance checksum. The checksum was being generated by a call to febootstrap-supermin-helper through popen(). Unfortunately, a bash misfeature meant that euid would be reset to uid, and the checksum was generated for uid, not euid. When virt-v2v is writing to a RHEV target, uid == 0 and euid == 36, which resulted in a cached appliance being created for root with permissions for uid 36. --- src/appliance.c | 51 +++++++++++++++++++++------------------------------ 1 files changed, 21 insertions(+), 30 deletions(-)