StackWalker¶

EESSI, somebody else’s stack
Reading a stack off the wire: CernVM-FS
The same stack somewhere else
An easystack is the list the bot will build
The bot is three processes and a comment
A site stack next to EESSI, not inside it

StackWalker

A stack forms a tree of modules on a machine that may never have built them. EESSI is one such tree. [1] CernVM-FS provides the mechanism by which it arrives. [2] A site stack resides alongside it. This part describes the arrival: the stratum, the bot, the easystack file, and the host injection.

stratum-0 to stratum-1 to CernVM-FS to client mount to module tree — StackWalker: a stratum becomes a module tree.¶

StackWalker: CernVM-FS, bot, easystack, host injection — StackWalker is a stratum becoming a module tree. Arrival is EESSI, CernVM-FS, the same stack elsewhere, the easystack, the bot, and host injections.¶

EESSI, somebody else’s stack is the first read when the machine lacks its own software.

EESSI
EESSI docs
software-layer
CernVM-FS