BOOTC-CONT...EFS-DIGEST(8)

💖 NAME 💖

bootc-container-composefs-digest — bestie, this one outputs the bootable composefs digest for a directory. That's it. That's the whole job. She's a one-trick pony and she ate. 💅

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✨ SYNOPSIS ✨

bootc container compute-composefs-digest [OPTIONS] [PATH]

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🦋 DESCRIPTION 🦋

okay so. This command outputs the bootable composefs digest for a directory. Slay.

This is literally the digest that bootc container ukify embeds in the kernel command line of a UKI. It's a 128-character SHA-512 hex string that identifies the filesystem contents. So like, it's the fingerprint of ur filesystem. Her vibe check, if u will. 🔥

Most image builds should be using bootc-container-ukify(8) instead, which computes it internally anyway — so if that's ur flow, u don't even need to be here, babes. This command is for scripting and debugging outside of that flow. It's giving "I know a guy who knows a guy" energy.

The digest depends on the EROFS format; see --erofs-version. And heads up:

⚠️ It must be run against a separate mount of the root filesystem, not the running root. Not the live one. Do not. not me running it against the running root and wondering why everything's cursed 💀

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👑 OPTIONS 👑

• PATH — Path to the filesystem root. Tell her where the root is at. 🫶
• --write-dumpfile-to=WRITE_DUMPFILE_TO — Oh u want receipts? This additionally generates a dumpfile for the preferred digest, written to the target path. Perfect for comparing builds side by side, no cap.
• --erofs-version=EROFS_VERSION — EROFS format version to use when computing the composefs digest. Which flavor of EROFS are we doing today bestie 🌸

Possible values:

• v1
• v2

Default: v1

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🌈 EXAMPLES 🌈

Compute the digest of a root filesystem mounted at /target:

bootc container compute-composefs-digest /target

Also write a composefs dumpfile, to compare against another build:

bootc container compute-composefs-digest --write-dumpfile-to /tmp/rootfs.dump /target

See? Easy. Iconic behaviour honestly. ⭐

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🎀 SEE ALSO 🎀

bootc(8), bootc-container-ukify(8)

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💜 VERSION 💜

v1.17.1

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and that's the whole page, bestie 💖 this was BOOTC-CONT...EFS-DIGEST(8) from the System Manager's Manual, rockin' v1.17.1 — go forth and compute those digests, u absolute main character 👑✨