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94 lines
2.6 KiB
Bash
94 lines
2.6 KiB
Bash
#!/usr/bin/env bash
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set -eo pipefail
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# set -x
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[[ $# -ge 3 ]]
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archive="$(realpath "$1")"
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epoch="$2"
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shift 2
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options=()
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for a in "$@"; do
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shift
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case "${a}" in
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--) break ;;
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-*) options+=("${a}") ;;
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*) break ;;
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esac
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done
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[[ $# -gt 0 ]]
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patterns=("$@")
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# We need to use the full path to the executable to avoid
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# a weird issue when using the p7zip project pre-built
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# binary (`Can't load './7z.dll' (7z.so)...`).
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sevenzip="$(which 7z)"
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# echo "archive : ${archive}"
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# echo "epoch : ${epoch}"
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# echo "options : ${options[@]}"
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# echo "patterns: ${patterns[@]}"
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tmpdir="$(mktemp -d -t tmp7z.XXXXXXXXXX)"
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trap 'rm -rf "${tmpdir}"' EXIT
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manifest="${tmpdir}/manifest"
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# Detect if that version of 7z deferences symlinks by default.
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sevenzip_manifest_cmd=("${sevenzip}" -ba h)
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ln -s /dev/null "${tmpdir}/symlink"
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checksum="$("${sevenzip_manifest_cmd[@]}" "${tmpdir}/symlink" | awk '{ print $1 }')"
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if [[ "${checksum}" != '00000000' ]]; then
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sevenzip_manifest_cmd+=(-l)
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fi
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rm -f "${tmpdir}/symlink"
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# Note: remove trailing `/` appended to directories in some 7z versions.
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"${sevenzip_manifest_cmd[@]}" "${patterns[@]}" |
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awk '{ if ($3!="") print $3, $2, $1; else { gsub("/$", "", $1); print $1 } }' |
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sort >"${manifest}"
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# cat "${manifest}" | less
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if [[ -r "${archive}" ]]; then
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if diff --brief --label 'in archive' \
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<(
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"${sevenzip}" -slt l "${archive}" |
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awk '
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/^([^=]+) = / { entry[$1] = $3; }
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/^CRC =/ { if ($3!="") print entry["Path"], entry["Size"], $3; else print entry["Path"] }
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' | sort
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) --label 'to add' "${manifest}"; then
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exit
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fi
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# There's no 7z option to overwrite the archive
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# if it already exists (instead of updating it)…
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rm -f "${archive}"
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fi
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# Extract list of paths from manifest.
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rev <"${manifest}" | cut -f3- -d' ' | rev >"${tmpdir}/paths"
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# Quick sanity check: no path outside the current directory.
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if grep '^(/|\.\./)' <"${tmpdir}/paths"; then
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echo "^ some paths are outside the current directory!"
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exit 1
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fi
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# Make a copy of everything so we can later
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# patch timestamp to ensure reproducibility.
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mkdir "${tmpdir}/contents"
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# We want to copy "empty" (with ignored files) directories.
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tar --dereference --no-recursion --create \
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--verbatim-files-from --files-from="${tmpdir}/paths" |
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tar --extract --directory="${tmpdir}/contents"
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cd "${tmpdir}/contents"
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# Fix timestamps.
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find . -depth -print0 | xargs -0 touch --date="${epoch}"
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# And create the final archive.
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"${sevenzip}" -mqs "${options[@]}" a "${archive}" .
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# vim: sw=4
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