Danny Canter
8b39713a00
Optimize unpack a little by trying to reduce allocations in the hot path. Today for every file we read the entire file into memory and then pass the data blob to the ext4 writer to eventually be written to the sparse file. Before being written to the sparse file the data is copied *again* to a temp buffer before finally hitting write(2) in FileHandle. This change moves things around such that we can pass an optional buffer to the ext4 create() (so we can reuse a buffer for file writes), as well as stops reading entire files into memory by passing the archive entry itself (wrapped in a ReaderStream object albeit) down to the writer. Testing with unpacking every platform for `docker.io/jenkins/jenkins:lts` on an M1 Max: Old Avg (5 runs): 7.43s New Avg (5 runs): 5.31s
ContainerizationEXT4
ContainerizationEXT4 provides functionality to read the superblock of an existing ext4 block device and format a new block device with
the ext4 file system.