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#638314431260324188 - bash script for creating reproducible .ISO images

create_iso.sh
System: Linux
125 downloads
Uploaded 9/27/2023 8:25 PM by feos (see all 191)
Script for creating reproducible .ISO images from a specified path.
Path can be specified as user input after running the script, or passed as an argument from the terminal.
Resulting file will be created near the script and called TAS_CD.iso.
To make it reproducible, we force date (2001-01-01) and mode (0444) on all files.
At the end we print paths and hashes of all packaged files (MD5 and SHA-1).
#!/bin/bash

# Script for creating reproducible .ISO images from a specified path.
# Path can be specified as user input after running the script,
# or passed as an argument from the terminal.
# Resulting file will be created near the script and called 'TAS_CD.iso'.
# To make it reproducible, we force date (2001-01-01) and mode (0444) on all files.
# At the end we print paths and hashes of all packaged files (MD5 and SHA-1).

export SOURCE_DATE_EPOCH="$(date -d20010101 -u +%s)"
output_filename=TAS_CD # also used as volume ID, so must be [A-Z_]+
file_mode=0444

folder="$1"
while [ ! -d "$folder" ]; do
	[ -z "$folder" ] || printf "'%s' not a directory?\n" "$folder"
	read -p "Enter path to dir containing source files: " folder
done
list="$(mktemp)"
(cd "$folder"; for f in *; do printf "%s\n" "$f=$PWD/$f"; done) \
	| LC_ALL=C sort >"$list"

xorriso \
	-preparer_id xorriso \
	-volume_date 'all_file_dates' "=$SOURCE_DATE_EPOCH" \
	-as mkisofs \
	-iso-level 3 \
	-volid "$output_filename" \
	-graft-points \
	-full-iso9660-filenames \
	-joliet \
	-file-mode $file_mode \
	-uid 0 \
	-gid 0 \
	-path-list "$list" \
	-output "$output_filename".iso

rm -f "$list"
cd "$folder"

echo "MD5:"
find . -type f -exec md5sum {} \;
echo
echo "SHA-1:"
find . -type f -exec sha1sum {} \;