36 lines
1.4 KiB
Plaintext
36 lines
1.4 KiB
Plaintext
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#!/bin/bash
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# anaconda-cleanup-initramfs - clean up initramfs to save RAM.
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#
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# Normal systems just throw away the initramfs after boot, since they have a
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# copy of it in /boot/initramfs-$(uname -r).img that they can unpack and use
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# to shut down the system cleanly. (See dracut-shutdown.service.)
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#
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# We have to keep initramfs because we don't have it laying around in /boot,
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# and we might want to read some files out of it (e.g. /etc/cmdline*)
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#
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# There are still redundant/unneeded files, though, and we can save RAM by
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# cleaning those up.
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systemd-notify --pid --status="Removing unneeded files..."
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# the runtime has all the firmware/modules we need.
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# removing the ssl certs saves another easy ~1MB.
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rm -rf /run/initramfs/usr/lib/{firmware,modules} \
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/run/initramfs/etc/ssl
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# Try to compress the remaining initramfs contents.
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# 99% of the RAM used by initramfs is in usr/, so just compress/remove that.
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# (this also means we save etc/cmdline* and we don't have to move mounts)
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# check for cpio and pigz/gzip.
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# (xz would be ~4MB smaller but uses 100MB RAM (!). gzip uses ~2MB.)
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type -P cpio >/dev/null || exit 0
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gzip=$(type -P pigz || type -P gzip) || exit 0
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# systemd-notify --ready --> continue startup, do the rest in the background
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systemd-notify --ready --status="Compressing initramfs contents..."
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mkdir -p /boot
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initramfs=/boot/initramfs-$(uname -r).img
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find /run/initramfs/usr | cpio -co 2>/dev/null | $gzip -c > $initramfs
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rm -rf /run/initramfs/usr
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