Constant ENV_TMPFS 

pub const ENV_TMPFS: &str = "MSB_TMPFS";

Environment variable carrying tmpfs mount specs for guest init.

Format: path[,key=value,...][;path[,key=value,...];...]

• path — guest mount path (required, always the first element)
• size=N — size limit in MiB (optional)
• noexec — mount with noexec flag (optional)
• mode=N — permission mode as octal integer (optional, e.g. mode=1777)

Entries are separated by ;. Within an entry, the path comes first followed by comma-separated options.

Examples:

• MSB_TMPFS=/tmp,size=256 — 256 MiB tmpfs at /tmp
• MSB_TMPFS=/tmp,size=256;/var/tmp,size=128 — two tmpfs mounts
• MSB_TMPFS=/tmp — tmpfs at /tmp with defaults
• MSB_TMPFS=/tmp,size=256,noexec — with noexec flag