mkinitfs: add optional support for pigz
pigz(1) is a parallel gzip implementation. As such, it significantly faster than gzip(1). This patch uses pigz(1) instead of gzip(1), if it is installed, otherwise it just falls back to gzip(1). This is similar to the current pigz support in abuild. Without this patch: $ time mkinitfs ==> initramfs: creating /boot/initramfs-lts real 0m 38.19s user 0m 35.47s sys 0m 0.49s With this patch applied and pigz installed: ==> initramfs: creating /boot/initramfs-lts real 0m 13.24s user 0m 38.30s sys 0m 0.56s This change was discussed on IRC with _ikke_ and mps.
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