mirror of
https://github.com/commaai/agnos-builder.git
synced 2026-09-08 01:13:40 +08:00
Adeeb Shihadeh
48 lines
1.5 KiB
Bash
Executable File
48 lines
1.5 KiB
Bash
Executable File
#!/bin/bash
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# Directory containing the root filesystem
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ROOTFS_DIR="build/agnos-rootfs"
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# Output file name for the BTRFS image
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IMAGE_FILE="agnos-rootfs.img"
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# Temporary directory for the BTRFS filesystem
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TEMP_DIR=$(mktemp -d)
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# Size for the initial BTRFS image (adjust as necessary)
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INITIAL_SIZE="10G"
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# Compression to use for BTRFS (LZO is commonly supported, but ZSTD might be better if available)
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COMPRESSION="lzo" # or "zstd" if your kernel supports it
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# Create a BTRFS filesystem in a loopback file
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truncate -s "$INITIAL_SIZE" "$IMAGE_FILE"
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mkfs.btrfs --compress=$COMPRESSION "$IMAGE_FILE"
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# Mount the BTRFS filesystem
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sudo mount -o compress=$COMPRESSION "$IMAGE_FILE" "$TEMP_DIR"
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# Copy the rootfs into the mounted BTRFS filesystem
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sudo rsync -aHAXx --info=progress2 "$ROOTFS_DIR"/ "$TEMP_DIR"/
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# Unmount the filesystem
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sudo umount "$TEMP_DIR"
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# Attempt to shrink the filesystem
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sudo losetup -fP "$IMAGE_FILE"
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LOOPDEV=$(losetup -j "$IMAGE_FILE" | awk '{print $1}' | sed 's/://')
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sudo btrfs filesystem resize min /dev/$LOOPDEV
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sudo btrfs check --repair /dev/$LOOPDEV
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sudo losetup -d /dev/$LOOPDEV
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# Resize the image file to the actual size of the filesystem
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# Note: This step requires knowing or estimating the exact size needed
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# Here, we'll use the size of the last block used by BTRFS
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SIZE=$(sudo btrfs inspect-internal dump-super "$IMAGE_FILE" | grep "total bytes" | awk '{print $3}')
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truncate -s "$SIZE" "$IMAGE_FILE"
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# Clean up
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rmdir "$TEMP_DIR"
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echo "BTRFS image created and shrunk: $IMAGE_FILE"
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