build a minimal chroot/container/vm filesystem by taking a list of files and putting them and their necessary libs into a target rootfs directory example: ``` rascul@coyote:~/mkroot$ cargo run -- -h Finished dev [unoptimized + debuginfo] target(s) in 0.03s Running `target/debug/mkroot -h` mkroot 0.1.0 rascul USAGE: mkroot [FLAGS] [OPTIONS] ... FLAGS: -h, --help Prints help information -V, --version Prints version information -v, --verbose Verbose OPTIONS: --ldd Path to LDD [default: /usr/bin/ldd] --osname OS name (for /etc/os-release) [default: mkroot] --osversion OS version (for /etc/os-release) [default: 1.0] ARGS: Directory for root filesystem ... Files to parse rascul@coyote:~/mkroot$ cargo run -- -v rootfs /bin/bash /usr/bin/tree Finished dev [unoptimized + debuginfo] target(s) in 0.04s Running `target/debug/mkroot -v rootfs /bin/bash /usr/bin/tree` Building root fs for ["/bin/bash", "/usr/bin/tree"] in rootfs Checking /bin/bash Adding /lib64/libreadline.so.7 Adding /lib64/libdl.so.2 Adding /lib64/libc.so.6 Adding /lib64/libtinfo.so.6 Adding /lib64/ld-linux-x86-64.so.2 Checking /usr/bin/tree Adding /lib64/libc.so.6 Adding /lib64/ld-linux-x86-64.so.2 Creating directory rootfs Creating directory rootfs/bin Creating directory rootfs/dev Creating directory rootfs/etc Creating directory rootfs/home Creating directory rootfs/lib Creating directory rootfs/lib64 Creating directory rootfs/proc Creating directory rootfs/root Creating directory rootfs/run Creating directory rootfs/sbin Creating directory rootfs/sys Creating directory rootfs/tmp Creating directory rootfs/usr Creating directory rootfs/var Creating directory rootfs/usr/bin Copying /bin/bash to rootfs/bin/bash Copying /usr/bin/tree to rootfs/bin/tree Copying /lib64/ld-linux-x86-64.so.2 to rootfs/lib64/ld-linux-x86-64.so.2 Copying /lib64/libc.so.6 to rootfs/lib64/libc.so.6 Copying /lib64/libdl.so.2 to rootfs/lib64/libdl.so.2 Copying /lib64/libreadline.so.7 to rootfs/lib64/libreadline.so.7 Copying /lib64/libtinfo.so.6 to rootfs/lib64/libtinfo.so.6 Setting linker rootfs/lib64/ld-linux-x86-64.so.2 to mode 0o755 Creating file etc/os-release rascul@coyote:~/mkroot$ sudo chroot rootfs /bin/bash bash-4.4# exit exit rascul@coyote:~/mkroot$ wget -q -O rootfs/sbin/init https://github.com/Yelp/dumb-init/releases/download/v1.2.2/dumb-init_1.2.2_amd64 rascul@coyote:~/mkroot$ chmod 0755 rootfs/sbin/init rascul@coyote:~/mkroot$ sudo systemd-nspawn -D rootfs/ /sbin/init /bin/bash Spawning container rootfs on /home/rascul/mkroot/rootfs. Press ^] three times within 1s to kill container. Timezone America/Chicago does not exist in container, not updating container timezone. bash-4.4# tree -x . |-- bin | |-- bash | `-- tree |-- dev |-- etc | |-- os-release | `-- resolv.conf |-- home |-- lib |-- lib64 | |-- ld-linux-x86-64.so.2 | |-- libc.so.6 | |-- libdl.so.2 | |-- libreadline.so.7 | `-- libtinfo.so.6 |-- proc |-- root |-- run |-- sbin | `-- init |-- sys |-- tmp |-- usr | `-- bin `-- var `-- log `-- journal 17 directories, 10 files bash-4.4# exit exit Container rootfs exited successfully. ```