[Libguestfs] [PATCH 1/2] Add -u and -g options to febootstrap-supermin-helper

Bash automatically resets euid to uid when it executes. This can mean that the effective user id of a program at the point it calls febootstrap-supermin-helper can be lost if any part of execution chain involved bash. This in turn can result in: * the generation of an incorrect checksum, which contains the uid. * the generation of supermin files with differing owners The -u and -g options allow the caller to pass in an explicit user and group to run as. These will be used when generating a checksum. Additionally, febootstrap-supermin-helper will set(u|g)id as appropriate if they are given for non-checksum output. This ensures all generated files will have the correct ownership, regardless of how they are created. --- helper/checksum.c | 2 +- helper/helper.h | 2 + helper/main.c | 145 ++++++++++++++++++++++++++++++++++++++++++++++------- 3 files changed, 130 insertions(+), 19 deletions(-)