Small utilities specifically written for s6-overlay.
s6-overlay-helpers centralizes all the additional C programs and libraries that are not part of any skarnet.org package but are used specifically in s6-overlay.
See the INSTALL file.
ISC; see the COPYING file.
This is a small program that can only be run as pid 1; it ensures that a given block of code is always run as root, even if the container is run with the USER directive. After the root block exits, if the USER directive has been given, privileges are dropped again and the rest of the execution proceeds as a normal user.
This is used in s6-overlay to make sure that a portion of the filesystem hierarchy always exists and is owned by the current user.
This binary needs the suid bit enabled so it can gain privileges to execute its argument as root. Since it can only be run as part of the pid 1 process chain, it does not endanger the security of the system; nevertheless, please audit the code until you have full confidence that it is secure.
In an execline script: s6-overlay-suexec { root_block... } normal_init...
On the command line: s6-overlay-suexec root_block... '' normal_init...
A simple utility that prints the uid and gid (and user and group, if available
in /etc/passwd and /etc/group) of a file given as argument. The output
is suitable for setting the uid, gid, user, group and perms variables for
the rest of the script.
In an execline script: pipeline { s6-overlay-stat file } envfile - prog...
In a shell script: eval `s6-overlay-stat file`