Update branch with all changes which could be brought in from private branches

For a while I was keeping a private branch where there were a lot of
non-public things included, and that became the de-facto branch while
this one lagged. This one is now up-to-date, all private stuff is dealt
with via config files which are not committed.

6 files changed, 432 insertions, 922 deletions

diff --git a/bin/dual-monitor b/bin/dual-monitor
new file mode 100755
index 0000000..9ed4d10
--- /dev/null
+++ b/bin/dual-monitor
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+xrandr \
+    --output eDP-1 \
+        --primary \
+        --mode 1920x1080 \
+        --pos 0x0 \
+        --rotate normal \
+    --output DP-1 --off \
+    --output HDMI-1 --off \
+    --output DP-2 --off \
+    --output HDMI-2 \
+        --mode 1920x1080 \
+        --pos 0x0 \
+        --rotate normal \
+        --brightness 0.9
diff --git a/bin/git-remote-gcrypt b/bin/git-remote-gcrypt
deleted file mode 100755
index 8b66f2f..0000000
--- a/bin/git-remote-gcrypt
+++ /dev/null
@@ -1,921 +0,0 @@
-#!/bin/sh
-
-#  git-remote-gcrypt
-#
-#  Copyright (c) 2013 engla
-#  Copyright (c) 2013, 2014 Joey Hess <id@joeyh.name>
-#  Copyright (c) 2016 Sean Whitton <spwhitton@spwhitton.name> and contributors
-#
-#  This program is free software: you can redistribute it and/or modify
-#  it under the terms of the GNU General Public License as published by
-#  the Free Software Foundation, either version 3 of the License, or
-#  (at your option) version 2 or any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-#
-#  See README.rst for usage instructions
-
-set -e # errexit
-set -f # noglob
-set -C # noclobber
-
-export GITCEPTION="${GITCEPTION:-}+" # Reuse $Gref except when stacked
-Gref="refs/gcrypt/gitception$GITCEPTION"
-Gref_rbranch="refs/heads/master"
-Packkey_bytes=63  # nbr random bytes for packfile keys, any >= 256 bit is ok
-Hashtype=SHA256   # SHA512 SHA384 SHA256 SHA224 supported.
-Manifestfile=91bd0c092128cf2e60e1a608c31e92caf1f9c1595f83f2890ef17c0e4881aa0a
-Hex40="[a-f0-9]"
-Hex40=$Hex40$Hex40$Hex40$Hex40$Hex40$Hex40$Hex40$Hex40
-Hex40=$Hex40$Hex40$Hex40$Hex40$Hex40 # Match SHA-1 hexdigest
-GPG="$(git config --get "gpg.program" '.+' || echo gpg)"
-
-Did_find_repo=  # yes for connected, no for no repo
-Localdir="${GIT_DIR:=.git}/remote-gcrypt"
-Tempdir=
-
-Repoid=
-Refslist=
-Packlist=
-Keeplist=
-Extnlist=
-Repack_limit=25
-
-Recipients=
-
-# compat/utility functions
-# xfeed: The most basic output function puts $1 into the stdin of $2..$#
-xfeed()
-{
-	local input_=
-	input_=$1; shift
-	"$@" <<EOF
-$input_
-EOF
-}
-xecho() { xfeed "$*" cat; }
-xecho_n() { xecho "$@" | tr -d \\n ; } # kill newlines
-echo_git() { xecho "$@" ; }  # Code clarity
-echo_info() { xecho "gcrypt:" "$@" >&2; }
-echo_die() { echo_info "$@" ; exit 1; }
-
-isnull() { case "$1" in "") return 0;; *) return 1;; esac; }
-isnonnull() { ! isnull "$1"; }
-iseq() { case "$1" in "$2") return 0;; *) return 1;; esac; }
-isnoteq() { ! iseq "$1" "$2"; }
-negate() { ! "$@"; }
-
-# Execute $@ or die
-pipefail()
-{
-	"$@" || { echo_info "'$1' failed!"; kill $$; exit 1; }
-}
-
-isurl() { isnull "${2%%$1://*}"; }
-islocalrepo() { isnull "${1##/*}" && [ ! -e "$1/HEAD" ]; }
-
-xgrep() { command grep "$@" || : ; }
-
-# setvar is used for named return variables
-# $1 *must* be a valid variable name, $2 is any value
-#
-# Conventions
-#   return variable names are passed with a @ prefix
-#   return variable functions use f_ prefix local vars
-#   return var consumers use r_ prefix vars (or Titlecase globals)
-setvar()
-{
-	isnull "${1##@*}" || echo_die "Missing @ for return variable: $1"
-	eval ${1#@}=\$2
-}
-
-Newline="
-"
-
-# $1 is return var, $2 is value appended with newline separator
-append_to()
-{
-	local f_append_tmp_=
-	eval f_append_tmp_=\$${1#@}
-	isnull "$f_append_tmp_" || f_append_tmp_=$f_append_tmp_$Newline
-	setvar "$1" "$f_append_tmp_$2"
-}
-
-# Pick words from each line
-# $1 return variable name
-# $2 input value
-pick_fields_1_2()
-{
-	local f_ret= f_one= f_two=
-	while read f_one f_two _ # from << here-document
-	do
-		f_ret="$f_ret$f_one $f_two$Newline"
-	done <<EOF
-$2
-EOF
-	setvar "$1" "${f_ret#$Newline}"
-}
-
-# Take all lines matching $2 (full line)
-# $1 return variable name
-# $2 filter word
-# $3 input value
-#  if $1 is a literal `!', the match is reversed (and arguments shift)
-#  we instead remove all lines matching
-filter_to()
-{
-	local f_neg= f_line= f_ret= IFS=
-	isnoteq "$1" "!" || { f_neg=negate; shift; }
-	IFS=$Newline
-	for f_line in $3
-	do
-		$f_neg isnonnull "${f_line##$2}" || f_ret=$f_ret$f_line$Newline
-	done
-	setvar "$1" "${f_ret%$Newline}"
-}
-
-# Output the number of lines in $1
-line_count()
-{
-	local IFS=
-	IFS=$Newline
-	set -- $1
-	xecho "$#"
-}
-
-
-## gitception part
-# Fetch giturl $1, file $2
-gitception_get()
-{
-	# Take care to preserve FETCH_HEAD
-	local ret_=: obj_id= fet_head="$GIT_DIR/FETCH_HEAD"
-	[ -e "$fet_head" ] && command mv -f "$fet_head" "$fet_head.$$~" || :
-	git fetch -q -f "$1" "$Gref_rbranch:$Gref" >/dev/null &&
-		obj_id="$(git ls-tree "$Gref" | xgrep -E '\b'"$2"'$' | awk '{print $3}')" &&
-		isnonnull "$obj_id" && git cat-file blob "$obj_id" && ret_=: ||
-		{ ret_=false && : ; }
-	[ -e "$fet_head.$$~" ] && command mv -f "$fet_head.$$~" "$fet_head" || :
-	$ret_
-}
-
-anon_commit()
-{
-	GIT_AUTHOR_NAME="root" GIT_AUTHOR_EMAIL="root@localhost" \
-	GIT_AUTHOR_DATE="1356994801 -0400" GIT_COMMITTER_NAME="root" \
-	GIT_COMMITTER_EMAIL="root@localhost" \
-	GIT_COMMITTER_DATE="1356994801 -0400" \
-		git commit-tree "$@" <<EOF
-Initial commit
-EOF
-}
-
-# Get 'tree' from $1, change file $2 to obj id $3
-update_tree()
-{
-	local tab_="	"
-	# $2 is a filename from the repo format
-	(set +e;
-		git ls-tree "$1" | xgrep -v -E '\b'"$2"'$';
-		xecho "100644 blob $3$tab_$2"
-	) | git mktree
-}
-
-# Put giturl $1, file $2
-# depends on previous GET to set $Gref and depends on PUT_FINAL later
-gitception_put()
-{
-	local obj_id= tree_id= commit_id=
-	obj_id=$(git hash-object -w --stdin) &&
-		tree_id=$(update_tree "$Gref" "$2" "$obj_id") &&
-		commit_id=$(anon_commit "$tree_id") &&
-		git update-ref "$Gref" "$commit_id"
-}
-
-# Remove giturl $1, file $2
-# depends on previous GET like put
-gitception_remove()
-{
-	local tree_id= commit_id= tab_="	"
-	# $2 is a filename from the repo format
-	tree_id=$(git ls-tree "$Gref" | xgrep -v -E '\b'"$2"'$' | git mktree) &&
-		commit_id=$(anon_commit "$tree_id") &&
-		git update-ref "$Gref" "$commit_id"
-}
-
-gitception_new_repo()
-{
-	local commit_id= empty_tree=4b825dc642cb6eb9a060e54bf8d69288fbee4904
-	# get any file to update Gref, and if it's not updated we create empty
-	git update-ref -d "$Gref" || :
-	gitception_get "$1" "x" 2>/dev/null >&2 || :
-	git rev-parse -q --verify "$Gref" >/dev/null && return 0 ||
-		commit_id=$(anon_commit "$empty_tree") &&
-		git update-ref "$Gref" "$commit_id"
-}
-## end gitception
-
-# Fetch repo $1, file $2, tmpfile in $3
-GET()
-{
-	if isurl sftp "$1"
-	then
-		(exec 0>&-; curl -s -S -k "$1/$2") > "$3"
-	elif isurl rsync "$1"
-	then
-		(exec 0>&-; rsync -I -W "${1#rsync://}"/"$2" "$3" >&2)
-	elif islocalrepo "$1"
-	then
-		cat "$1/$2" > "$3"
-	else
-		gitception_get "${1#gitception://}" "$2" > "$3"
-	fi
-}
-
-# Put repo $1, file $2 or fail, tmpfile in $3
-PUT()
-{
-	if isurl sftp "$1"
-	then
-		curl -s -S -k --ftp-create-dirs -T "$3" "$1/$2"
-	elif isurl rsync "$1"
-	then
-		rsync -I -W "$3" "${1#rsync://}"/"$2" >&2
-	elif islocalrepo "$1"
-	then
-		cat >| "$1/$2" < "$3"
-	else
-		gitception_put "${1#gitception://}" "$2" < "$3"
-	fi
-}
-
-# Put all PUT changes for repo $1 at once
-PUT_FINAL()
-{
-	if isurl sftp "$1" || islocalrepo "$1" || isurl rsync "$1"
-	then
-		:
-	else
-		git push --quiet -f "${1#gitception://}" "$Gref:$Gref_rbranch"
-	fi
-}
-
-# Put directory for repo $1
-PUTREPO()
-{
-	if isurl sftp "$1"
-	then
-		:
-	elif isurl rsync "$1"
-	then
-		rsync -q -r --exclude='*' "$Localdir/" "${1#rsync://}" >&2
-	elif islocalrepo "$1"
-	then
-		mkdir -p "$1"
-	else
-		gitception_new_repo "${1#gitception://}"
-	fi
-}
-
-# For repo $1, delete all newline-separated files in $2
-REMOVE()
-{
-	local fn_=
-	if isurl sftp "$1"
-	then
-		# FIXME
-		echo_info "sftp: Ignore remove request $1/$2"
-	elif isurl rsync "$1"
-	then
-		xfeed "$2" rsync -I -W -v -r --delete --include-from=- \
-			--exclude='*' "$Localdir"/ "${1#rsync://}/" >&2
-	elif islocalrepo "$1"
-	then
-		for fn_ in $2; do
-			rm -f "$1"/"$fn_"
-		done
-	else
-		for fn_ in $2; do
-			gitception_remove "${1#gitception://}" "$fn_"
-		done
-	fi
-}
-
-CLEAN_FINAL()
-{
-	if isurl sftp "$1" || islocalrepo "$1" || isurl rsync "$1"
-	then
-		:
-	else
-		git update-ref -d "$Gref" || :
-	fi
-}
-
-ENCRYPT()
-{
-	rungpg --batch --force-mdc --compress-algo none --trust-model=always --passphrase-fd 3 -c 3<<EOF
-$1
-EOF
-}
-
-DECRYPT()
-{
-	rungpg -q --batch --no-default-keyring --secret-keyring /dev/null \
-		--keyring /dev/null --passphrase-fd 3 -d  3<<EOF
-$1
-EOF
-}
-
-# Encrypt to recipients $1
-PRIVENCRYPT()
-{
-	set -- $1
-	if isnonnull "$Conf_signkey"; then
-		set -- "$@" -u "$Conf_signkey"
-	fi
-	rungpg --compress-algo none --trust-model=always -se "$@"
-}
-
-# $1 is the match for good signature, $2 is the textual signers list
-PRIVDECRYPT()
-{
-	local status_=
-	exec 4>&1 &&
-	status_=$(rungpg --status-fd 3 -q -d 3>&1 1>&4) &&
-	xfeed "$status_" grep "^\[GNUPG:\] ENC_TO " >/dev/null &&
-	(xfeed "$status_" grep -e "$1" >/dev/null || {
-		echo_info "Failed to verify manifest signature!" &&
-		echo_info "Only accepting signatories: ${2:-(none)}" &&
-		return 1
-	})
-}
-
-# Generate $1 random bytes
-genkey()
-{
-	rungpg --armor --gen-rand 1 "$1"
-}
-
-gpg_hash()
-{
-	local hash_=
-	hash_=$(rungpg --with-colons --print-md "$1" | tr A-F a-f)
-	hash_=${hash_#:*:}
-	xecho "${hash_%:}"
-}
-
-rungpg()
-{
-	if isnonnull "$Conf_gpg_args"; then
-		set -- "$Conf_gpg_args" "$@"
-	fi
-	# gpg will fail to run when there is no controlling tty,
-	# due to trying to print messages to it, even if a gpg agent is set
-	# up. --no-tty fixes this.
-	if [ "x$GPG_AGENT_INFO" != "x" ]; then
-		${GPG} --no-tty $@
-	else
-		${GPG} $@
-	fi
-}
-
-# Pass the branch/ref by pipe to git
-safe_git_rev_parse()
-{
-	git cat-file --batch-check 2>/dev/null |
-		xgrep -v "missing" | cut -f 1 -d ' '
-}
-
-make_new_repo()
-{
-	echo_info "Setting up new repository"
-	PUTREPO "$URL"
-
-	# Needed assumption: the same user should have no duplicate Repoid
-	Repoid=":id:$(genkey 15)"
-	iseq "${NAME#gcrypt::}" "$URL" ||
-		git config "remote.$NAME.gcrypt-id" "$Repoid"
-	echo_info "Remote ID is $Repoid"
-	Extnlist="extn comment"
-}
-
-
-# $1 return var for goodsig match, $2 return var for signers text
-read_config()
-{
-	local recp_= r_tail= r_keyinfo= r_keyfpr= gpg_list= cap_= conf_part= good_sig= signers_=
-	Conf_signkey=$(git config --get "remote.$NAME.gcrypt-signingkey" '.+' ||
-		git config --path user.signingkey || :)
-	conf_part=$(git config --get "remote.$NAME.gcrypt-participants" '.+' ||
-		    git config --get gcrypt.participants '.+' || :)
-	Conf_pubish_participants=$(git config --get --bool "remote.$NAME.gcrypt-publish-participants" '.+' ||
-		git config --get --bool gcrypt.publish-participants || :)
-	Conf_gpg_args=$(git config --get gcrypt.gpg-args '.+' || :)
-
-	# Figure out which keys we should encrypt to or accept signatures from
-	if isnull "$conf_part" || iseq "$conf_part" simple
-	then
-		signers_="(default keyring)"
-		Recipients="--throw-keyids --default-recipient-self"
-		good_sig="^\[GNUPG:\] GOODSIG "
-		setvar "$1" "$good_sig"
-		setvar "$2" "$signers_"
-		return 0
-	fi
-
-	for recp_ in $conf_part
-	do
-		gpg_list=$(rungpg --with-colons --fingerprint -k "$recp_")
-		r_tail_=$(echo "$recp_" | sed -e 's/^0x//')
-		filter_to @r_keyinfo "pub*" "$gpg_list"
-		if echo "$recp_" | grep -E -q '^[xA-F0-9]+$'; then # is $recp_ a keyid?
-			filter_to @r_keyfpr "fpr*$r_tail_*" "$gpg_list"
-		else
-			filter_to @r_keyfpr "fpr*" "$gpg_list"
-		fi
-		isnull "$r_keyinfo" || isnonnull "${r_keyinfo##*"$Newline"*}" ||
-		echo_info "WARNING: '$recp_' matches multiple keys, using one"
-		isnull "$r_keyfpr" || isnonnull "${r_keyfpr##*"$Newline"*}" ||
-		echo_info "WARNING: '$recp_' matches multiple fingerprints, using one"
-		r_keyinfo=${r_keyinfo%%"$Newline"*}
-		r_keyfpr=${r_keyfpr%%"$Newline"*}
-		keyid_=$(xfeed "$r_keyinfo" cut -f 5 -d :)
-		fprid_=$(xfeed "$r_keyfpr" cut -f 10 -d :)
-
-		isnonnull "$fprid_" &&
-		signers_="$signers_ $keyid_" &&
-		append_to @good_sig "^\[GNUPG:\] VALIDSIG .*$fprid_$" || {
-			echo_info "WARNING: Skipping missing key $recp_"
-			continue
-		}
-		# Check 'E'ncrypt capability
-		cap_=$(xfeed "$r_keyinfo" cut -f 12 -d :)
-		if ! iseq "${cap_#*E}" "$cap_"; then
-			if [ "$Conf_pubish_participants" = true ]; then
-				Recipients="$Recipients -r $keyid_"
-			else
-				Recipients="$Recipients -R $keyid_"
-			fi
-		fi
-	done
-
-	if isnull "$Recipients"
-	then
-		echo_info "You have not configured any keys you can encrypt to" \
-			"for this repository"
-		echo_info "Use ::"
-		echo_info "  git config gcrypt.participants YOURKEYID"
-		exit 1
-	fi
-	setvar "$1" "$good_sig"
-	setvar "$2" "$signers_"
-}
-
-ensure_connected()
-{
-	local manifest_= r_repoid= r_name= url_frag= r_sigmatch= r_signers= \
-		tmp_manifest=
-
-	if isnonnull "$Did_find_repo"
-	then
-		return
-	fi
-	Did_find_repo=no
-	read_config @r_sigmatch @r_signers
-
-	iseq "${NAME#gcrypt::}" "$URL" || r_name=$NAME
-
-	if isurl gitception "$URL" && isnonnull "$r_name"; then
-		git config "remote.$r_name.url" "gcrypt::${URL#gitception://}"
-		echo_info "Updated URL for $r_name, gitception:// -> ()"
-	fi
-
-	# Find the URL fragment
-	url_frag=${URL##*"#"}
-	isnoteq "$url_frag" "$URL" || url_frag=
-	URL=${URL%"#$url_frag"}
-
-	# manifestfile -- sha224 hash if we can, else the default location
-	if isurl sftp "$URL" || islocalrepo "$URL" || isurl rsync "$URL"
-	then
-		# not for gitception
-		isnull "$url_frag" ||
-			Manifestfile=$(xecho_n "$url_frag" | gpg_hash SHA224)
-	else
-		isnull "$url_frag" || Gref_rbranch="refs/heads/$url_frag"
-	fi
-
-	Repoid=
-	isnull "$r_name" ||
-		Repoid=$(git config "remote.$r_name.gcrypt-id" || :)
-
-
-	tmp_manifest="$Tempdir/maniF"
-	GET "$URL" "$Manifestfile" "$tmp_manifest" 2>/dev/null || {
-		echo_info "Repository not found: $URL"
-		if ! isnull "$Repoid"; then
-			echo_info "..but repository ID is set. Aborting."
-			return 1
-		else
-			return 0
-		fi
-	}
-
-	Did_find_repo=yes
-	echo_info "Decrypting manifest"
-	manifest_=$(PRIVDECRYPT "$r_sigmatch" "$r_signers" < "$tmp_manifest") &&
-		isnonnull "$manifest_" ||
-		echo_die "Failed to decrypt manifest!"
-	rm -f "$tmp_manifest"
-
-	filter_to @Refslist "$Hex40 *" "$manifest_"
-	filter_to @Packlist "pack :*:* *" "$manifest_"
-	filter_to @Keeplist "keep :*:*" "$manifest_"
-	filter_to @Extnlist "extn *" "$manifest_"
-	filter_to @r_repoid "repo *" "$manifest_"
-
-	r_repoid=${r_repoid#repo }
-	r_repoid=${r_repoid% *}
-	if isnull "$Repoid"
-	then
-		echo_info "Remote ID is $r_repoid"
-		Repoid=$r_repoid
-	elif isnoteq "$r_repoid" "$Repoid"
-	then
-		echo_info "WARNING:"
-		echo_info "WARNING: Remote ID has changed!"
-		echo_info "WARNING: from $Repoid"
-		echo_info "WARNING: to   $r_repoid"
-		echo_info "WARNING:"
-		Repoid=$r_repoid
-	else
-		return 0
-	fi
-
-	isnull "$r_name" || git config "remote.$r_name.gcrypt-id" "$r_repoid"
-}
-
-# $1 is the hash type (SHA256 etc)
-# $2 the pack id
-# $3 the key
-get_verify_decrypt_pack()
-{
-	local rcv_id= tmp_encrypted=
-	tmp_encrypted="$Tempdir/packF"
-	GET "$URL" "$2" "$tmp_encrypted" &&
-	rcv_id=$(gpg_hash "$1" < "$tmp_encrypted") &&
-	iseq "$rcv_id" "$2" || echo_die "Packfile $2 does not match digest!"
-	DECRYPT "$3" < "$tmp_encrypted"
-	rm -f "$tmp_encrypted"
-}
-
-# download all packlines (pack :SHA256:a32abc1231) from stdin (or die)
-# $1 destdir (when repack, else "")
-get_pack_files()
-{
-	local pack_id= r_pack_key_line= htype_= pack_= key_=
-	while IFS=': ' read -r _ htype_ pack_ # <<here-document
-	do
-		isnonnull "$pack_" || continue
-
-		# Get the Packlist line with the key
-		pack_id=":${htype_}:$pack_"
-		filter_to @r_pack_key_line "pack $pack_id *" "$Packlist"
-		key_=${r_pack_key_line#pack $pack_id }
-
-		if isnonnull "${pack_##$Hex40*}" ||
-			isnoteq "$htype_" SHA256 && isnoteq "$htype_" SHA224 &&
-			isnoteq "$htype_" SHA384 && isnoteq "$htype_" SHA512
-		then
-			echo_die "Packline malformed: $pack_id"
-		fi
-
-		get_verify_decrypt_pack "$htype_" "$pack_" "$key_" | \
-		if isnull "${1:-}"
-		then
-			# add to local pack list
-			git index-pack -v --stdin >/dev/null
-			xecho "pack $pack_id" >> "$Localdir/have_packs$GITCEPTION"
-		else
-			git index-pack -v --stdin "$1/${pack_}.pack" >/dev/null
-		fi
-	done
-}
-
-# Download and unpack remote packfiles
-# $1 return var for list of packfiles to delete
-repack_if_needed()
-{
-	local n_= m_= kline_= r_line= r_keep_packlist= r_del_list=
-
-	isnonnull "$Packlist" || return 0
-
-	if isnonnull "${GCRYPT_FULL_REPACK:-}"
-	then
-		Keeplist=
-		Repack_limit=0
-	fi
-
-	pick_fields_1_2 @r_del_list "$Packlist"
-
-	n_=$(line_count "$Packlist")
-	m_=$(line_count "$Keeplist")
-	if iseq 0 "$(( $Repack_limit < ($n_ - $m_) ))"; then
-		return
-	fi
-	echo_info "Repacking remote $NAME, ..."
-
-	mkdir "$Tempdir/pack"
-
-	# Split packages to keep and to repack
-	if isnonnull "$Keeplist"; then
-		while read -r _ kline_ _ # <<here-document
-		do
-			isnonnull "$kline_" || continue
-			filter_to @r_line "pack $kline_ *" "$Packlist"
-			append_to @r_keep_packlist "$r_line"
-			filter_to ! @r_del_list "pack $kline_" "$r_del_list"
-		done <<EOF
-$Keeplist
-EOF
-	fi
-
-	xfeed "$r_del_list" get_pack_files "$Tempdir/pack/"
-
-	(set +f; pipefail git verify-pack -v "$Tempdir"/pack/*.idx) |
-		grep -E '^[0-9a-f]{40}' | cut -f 1 -d ' '
-
-	Packlist=$r_keep_packlist
-	setvar "$1" "$r_del_list"
-}
-
-do_capabilities()
-{
-	echo_git fetch
-	echo_git push
-	echo_git
-}
-
-do_list()
-{
-	local obj_id= ref_name= line_=
-	ensure_connected
-
-	xecho "$Refslist" | while read line_
-	do
-		isnonnull "$line_" || break
-		obj_id=${line_%% *}
-		ref_name=${line_##* }
-		echo_git "$obj_id" "$ref_name"
-		if iseq "$ref_name" "refs/heads/master"
-		then
-			echo_git "@refs/heads/master HEAD"
-		fi
-	done
-
-	# end with blank line
-	echo_git
-}
-
-do_fetch()
-{
-	# Download packs in the manifest that don't appear in have_packs
-	local pneed_= premote_=
-
-	ensure_connected
-
-	# The `+` for $GITCEPTION is pointless but we will be safe for stacking
-	pick_fields_1_2 @premote_ "$Packlist"
-	if [ -s "$Localdir/have_packs+" ]
-	then
-		pneed_=$(xfeed "$premote_" xgrep -v -x -f "$Localdir/have_packs+")
-	else
-		pneed_=$premote_
-	fi
-
-	xfeed "$pneed_" get_pack_files
-
-	echo_git # end with blank line
-}
-
-# do_push PUSHARGS (multiple lines like +src:dst, with both + and src opt.)
-do_push()
-{
-	# Security protocol:
-	# Each git packfile is encrypted and then named for the encrypted
-	# file's hash. The manifest is updated with the pack id.
-	# The manifest is encrypted.
-	local r_revlist= pack_id= key_= obj_= src_= dst_= \
-		r_pack_delete= tmp_encrypted= tmp_objlist= tmp_manifest=
-
-	ensure_connected
-
-	if iseq "$Did_find_repo" "no"
-	then
-		make_new_repo
-	fi
-
-	if isnonnull "$Refslist"
-	then
-		# mark all remote refs with  ^<sha-1> (if sha-1 exists locally)
-		r_revlist=$(xfeed "$Refslist" cut -f 1 -d ' ' |
-			safe_git_rev_parse | sed -e 's/^\(.\)/^&/')
-	fi
-
-	while IFS=: read -r src_ dst_ # << +src:dst
-	do
-		src_=${src_#+}
-		filter_to ! @Refslist "$Hex40 $dst_" "$Refslist"
-
-		if isnonnull "$src_"
-		then
-			append_to @r_revlist "$src_"
-			obj_=$(xfeed "$src_" safe_git_rev_parse)
-			append_to @Refslist "$obj_ $dst_"
-		fi
-	done <<EOF
-$1
-EOF
-
-	tmp_encrypted="$Tempdir/packP"
-	tmp_objlist="$Tempdir/objlP"
-
-	{
-		xfeed "$r_revlist" git rev-list --objects --stdin --
-		repack_if_needed @r_pack_delete
-	} > "$tmp_objlist"
-
-	# Only send pack if we have any objects to send
-	if [ -s "$tmp_objlist" ]
-	then
-		key_=$(genkey "$Packkey_bytes")
-		pack_id=$(export GIT_ALTERNATE_OBJECT_DIRECTORIES=$Tempdir;
-			pipefail git pack-objects --stdout < "$tmp_objlist" |
-			pipefail ENCRYPT "$key_" |
-			tee "$tmp_encrypted" | gpg_hash "$Hashtype")
-
-		append_to @Packlist "pack :${Hashtype}:$pack_id $key_"
-		if isnonnull "$r_pack_delete"
-		then
-			append_to @Keeplist "keep :${Hashtype}:$pack_id 1"
-		fi
-	fi
-
-	# Generate manifest
-	echo_info "Encrypting to: $Recipients"
-	echo_info "Requesting manifest signature"
-
-	tmp_manifest="$Tempdir/maniP"
-	PRIVENCRYPT "$Recipients" > "$tmp_manifest" <<EOF
-$Refslist
-$Packlist
-$Keeplist
-repo $Repoid
-$Extnlist
-EOF
-
-	# Upload pack
-	if [ -s "$tmp_objlist" ]
-	then
-		PUT "$URL" "$pack_id" "$tmp_encrypted"
-	fi
-
-	# Upload manifest
-	PUT "$URL" "$Manifestfile" "$tmp_manifest"
-
-	rm -f "$tmp_encrypted"
-	rm -f "$tmp_objlist"
-	rm -f "$tmp_manifest"
-
-	# Delete packs
-	if isnonnull "$r_pack_delete"; then
-		REMOVE "$URL" "$(xecho "$r_pack_delete" | \
-			while IFS=': ' read -r _ _ pack_
-			do
-				isnonnull "$pack_" || continue
-				xecho "$pack_"
-			done)"
-	fi
-
-	PUT_FINAL "$URL"
-
-	# ok all updates
-	while IFS=: read -r src_ dst_ # << +src:dst
-	do
-		echo_git "ok $dst_"
-	done <<EOF
-$1
-EOF
-	
-	echo_git 
-}
-
-cleanup_tmpfiles()
-{
-	if isnonnull "${Tempdir%%*."$$"}"; then
-		echo_die "Unexpected Tempdir value: $Tempdir"
-	fi
-	rm -r -f -- "${Tempdir}" >&2
-}
-
-setup()
-{
-	mkdir -p "$Localdir"
-
-	# Set up a subdirectory in /tmp
-	temp_key=$(genkey 9 | tr '/' _)
-	Tempdir="${TMPDIR:-/tmp}/git-remote-gcrypt-${temp_key}.$$"
-	case "${MSYSTEM:-unknown}" in
-	MSYS*|MINGW*)
-		mkdir "${Tempdir}"
-		echo_info "Warning: Not securing tempdir ${Tempdir} because we are on mingw/msys"
-		;;
-	unknown|*)
-		mkdir -m 700 "${Tempdir}"
-		;;
-	esac
-
-	trap cleanup_tmpfiles EXIT
-	trap 'exit 1' 1 2 3 15
-}
-
-# handle git-remote-helpers protocol
-gcrypt_main_loop()
-{
-	local input_= input_inner= r_args= temp_key=
-
-	NAME=$1  # Remote name
-	URL=$2   # Remote URL
-
-	setup
-
-	while read input_
-	do
-		case "$input_" in
-		capabilities)
-			do_capabilities
-			;;
-		list|list\ for-push)
-			do_list
-			;;
-		fetch\ *)
-			r_args=${input_##fetch }
-			while read input_inner
-			do
-				case "$input_inner" in
-				fetch*)
-				r_args= #ignored
-				;;
-				*)
-				break
-				;;
-				esac
-			done
-			do_fetch "$r_args"
-			;;
-		push\ *)
-			r_args=${input_##push }
-			while read input_inner
-			do
-				case "$input_inner" in
-				push\ *)
-					append_to @r_args "${input_inner#push }"
-				;;
-				*)
-					break
-				;;
-				esac
-			done
-			do_push "$r_args"
-			;;
-		?*)
-			echo_die "Unknown input!"
-			;;
-		*)
-			CLEAN_FINAL "$URL"
-			exit 0
-			;;
-		esac
-	done
-}
-
-if [ "x$1" = x--check ]
-then
-	NAME=dummy-gcrypt-check
-	URL=$2
-	setup
-	ensure_connected
-	git remote remove $NAME 2>/dev/null || true
-	if iseq "$Did_find_repo" "no"
-	then
-		exit 100
-	fi
-else
-	gcrypt_main_loop "$@"
-fi
diff --git a/bin/go-playground b/bin/go-playground
index 37675d0..64633a9 100755
--- a/bin/go-playground
+++ b/bin/go-playground
@@ -1,5 +1,5 @@
 #!/bin/sh
 cd "$(mktemp -d)";
 go mod init local-playground;
-echo -e 'package main\n\nimport (\n\t"fmt"\n)\n\nfunc main() {\n\tfmt.Println("aloha")\n}\n' > main.go;
+echo 'package main\n\nimport (\n\t"fmt"\n)\n\nfunc main() {\n\tfmt.Println("aloha")\n}\n' > main.go;
 $EDITOR main.go;
diff --git a/bin/quick-reboot b/bin/quick-reboot
new file mode 100755
index 0000000..9f7b751
--- /dev/null
+++ b/bin/quick-reboot
@@ -0,0 +1,31 @@
+#!/bin/sh
+
+set -e
+
+# This assumes that /proc/cmdline contains a cryptdevice with a UUID identifier,
+# like:
+#
+# cryptdevice=UUID=1ff1d6f7-7540-4500-8011-1abe1e9ac00d:cryptroot
+uuid=$(cat /proc/cmdline | \
+    tr ' ' '\n' | \
+    grep cryptdevice | \
+    cut -d= -f3 | \
+    cut -d: -f1)
+
+device=$(lsblk -o PATH,UUID | grep "$uuid" | awk '{print $1}')
+echo "Root device is $device"
+
+echo -n "Enter root key: "
+read -s pw
+echo ""
+
+# This will check if the key is right, and cause the process to exit if not due
+# to the "set -e"
+echo "Checking key..."
+echo "$pw" | sudo cryptsetup open --test-passphrase "$device"
+
+echo "Good job, writing /boot/keyfile..."
+echo -n "$pw" | sudo tee /boot/keyfile >/dev/null
+
+echo "Rebooting..."
+sudo systemctl reboot
diff --git a/bin/quick-shutdown b/bin/quick-shutdown
new file mode 100755
index 0000000..f5a5259
--- /dev/null
+++ b/bin/quick-shutdown
@@ -0,0 +1,31 @@
+#!/bin/sh
+
+set -e
+
+# This assumes that /proc/cmdline contains a cryptdevice with a UUID identifier,
+# like:
+#
+# cryptdevice=UUID=1ff1d6f7-7540-4500-8011-1abe1e9ac00d:cryptroot
+uuid=$(cat /proc/cmdline | \
+    tr ' ' '\n' | \
+    grep cryptdevice | \
+    cut -d= -f3 | \
+    cut -d: -f1)
+
+device=$(lsblk -o PATH,UUID | grep "$uuid" | awk '{print $1}')
+echo "Root device is $device"
+
+echo -n "Enter root key: "
+read -s pw
+echo ""
+
+# This will check if the key is right, and cause the process to exit if not due
+# to the "set -e"
+echo "Checking key..."
+echo "$pw" | sudo cryptsetup open --test-passphrase "$device"
+
+echo "Good job, writing /boot/keyfile..."
+echo -n "$pw" | sudo tee /boot/keyfile >/dev/null
+
+echo "Shutting down..."
+sudo systemctl poweroff
diff --git a/bin/rotcheck b/bin/rotcheck
new file mode 100755
index 0000000..c8a59fe
--- /dev/null
+++ b/bin/rotcheck
@@ -0,0 +1,353 @@
+#!/bin/sh
+set -uf
+IFS="$(printf '\n\t')"
+LC_ALL="C"
+
+# Copyright (C) 2019 Jamie Nguyen <j@jamielinux.com>
+#
+# A simple shell script to recursively generate, update and verify checksums
+# for files you care about. It's useful for detecting bit rot.
+#
+# It's written in POSIX shell, but requires GNU coreutils, BusyBox or some
+# other collection that includes similar checksum tools.
+
+VERSION=1.1.2
+COMMAND="sha512sum"
+CHECKFILE="./.rotcheck"
+
+APPEND_MODE=0
+CHECK_MODE=0
+DELETE_MODE=0
+UPDATE_MODE=0
+
+IGNORE_MISSING=0
+FOLLOW_SYMLINKS=1
+VERBOSE=0
+WARN_FORMATTING=0
+EXCLUDE_HIDDEN=0
+FORCE_UPDATE=0
+
+usage() {
+    cat << EOF
+rotcheck $VERSION
+Usage: rotcheck MODE [OPTIONS]
+   or: rotcheck MODE [OPTIONS] -- [DIRECTORY]... [ARBITRARY FIND OPTION]...
+Recursively generate, update and verify checksums.
+
+MODES:
+ -a           APPEND mode: Record checksums for any files without a checksum
+              already. Never modify existing checksums.
+ -c           CHECK mode: Check that files checksums are the same.
+ -d           DELETE mode: Remove checksums for files that don't exist.
+ -u           APPEND-AND-UPDATE mode: Like append-only mode, but also update
+              checksums for files with a modification date newer than the
+              the checksum file. (NB: Also see \`-M\`.)
+
+OPTIONS:
+ -b COMMAND   Checksum command to use. Default: sha512sum
+ -f FILE      File to store checksums. For relative paths, prefix with "./"
+              or the checksum file will be checksummed. Default: ./.rotcheck
+ -h           Display this help.
+ -n           Don't follow symlinks. The default is to follow symlinks.
+ -v           Be more verbose when adding, deleting, changing or verifying
+              checksums.
+ -w           Warn about improperly formatted checksum lines.
+ -x           Exclude all hidden files and directories when generating
+              checksums. The default is to include them.
+ -M           Use with \`-u\` to update checksums regardless of modification
+              time. This is very slow so avoid if possible; try \`touch\`
+              instead to bump the modification time of specific files.
+              WARNING: The checksums might have changed due to bit rot so
+              use this option with care!
+
+ (specific to GNU coreutils >= 8.25)
+ -i           Ignore missing files when verifying checksums.
+
+
+Supported commands:
+  GNU coreutils:
+    md5sum, sha1sum, sha224sum, sha256sum, sha384sum, sha512sum, b2sum
+
+  BusyBox (applets must be symlinked):
+    md5sum, sha1sum, sha256sum, sha512sum, sha3sum
+
+  BSD & macOS (install GNU coreutils):
+    gmd5sum, gsha1sum, gsha224sum, gsha256sum, gsha384sum, gsha512sum, gb2sum
+
+
+Examples:
+  # Create checksum file (located at "./.rotcheck"):
+  rotcheck -a
+
+  # You've added some new files and need to append some checksums:
+  rotcheck -va
+
+  # You've edited some files and need to update the checksums (for files with
+  # a modification time newer than the checksum file):
+  rotcheck -vu
+
+  # Verify checksums:
+  rotcheck -c
+
+  # Search other directories instead of the current directory.
+  # WARNING: checksums might get duplicated if mixing relative and absolute
+  # paths, or if you change the way you specify directory paths!
+  rotcheck -a -- /mnt/archive-2018/ /mnt/archive-2019/
+
+  # Exclude .git folders (these arguments are passed directly to find):
+  rotcheck -a -- ! -path '*/\\.git/*'
+
+EOF
+    exit 0
+}
+
+fail() {
+    printf '%s\n' "$@"; exit 1
+}
+
+# Curiously, I stumbled across a bug in bash-3.0.16 (c. 2004) or older
+# where \0177 (DEL) isn't handled properly. See the `find_safe` function below.
+# bash-3.1 (c. 2005), dash-0.5.2 (c. 2005), and zsh-3.1 (c. 2000) all work
+# and probably others too.
+if [ -n ${BASH+x} ] && [ -n ${BASH_VERSION+x} ]; then
+    if printf '%s' "${BASH_VERSION:-x}" | grep -qE '^[0-2]+|^3\.0'; then
+        fail "bash-3.0.16 and older are broken." \
+             "Try bash>=3.1, dash, zsh, or another POSIX shell."
+    fi
+fi
+
+# Command-line arguments. `getopts` is POSIX, while `getopt` is not.
+[ $# -gt 0 ] && [ "$1" = "--help" ] && usage
+while getopts ":acdub:f:hinvwxM" opt; do
+    case "$opt" in
+        a)  APPEND_MODE=1;;
+        c)  CHECK_MODE=1;;
+        d)  DELETE_MODE=1;;
+        u)  UPDATE_MODE=1;;
+        b)  COMMAND="$OPTARG";;
+        f)  CHECKFILE="$OPTARG";;
+        h)  usage;;
+        i)  IGNORE_MISSING=1;;
+        n)  FOLLOW_SYMLINKS=0;;
+        v)  VERBOSE=1;;
+        w)  WARN_FORMATTING=1;;
+        x)  EXCLUDE_HIDDEN=1;;
+        M)  FORCE_UPDATE=1;;
+        \?) fail "-$OPTARG: Invalid argument";;
+        :)  fail "-$OPTARG requires an argument";;
+    esac
+done; shift $(($OPTIND - 1))
+
+
+
+# A few sanity checks.
+MODE=$(($APPEND_MODE + $CHECK_MODE + $DELETE_MODE + $UPDATE_MODE))
+if [ $MODE -eq 0 ]; then
+    fail "Please specify one of -a, -c, -d, or -u." \
+         "See \`rotcheck -h\` for help with usage."
+elif [ $MODE -gt 1 ]; then
+    fail "You can only use one of -a, -c, -d, or -u options." \
+         "See \`rotcheck -h\` for help with usage."
+elif [ $CHECK_MODE -eq 1 ] || [ $DELETE_MODE -eq 1 ]; then
+    if [ ! -f "$CHECKFILE" ]; then
+        fail "$CHECKFILE: No such file." \
+             "Try running \`rotcheck -a\` first, or see \`rotcheck -h\`."
+    fi
+elif ! command -v "$COMMAND" >/dev/null 2>/dev/null; then
+    fail "$COMMAND: command not found" \
+         "Try specifying a supported command using \`rotcheck -b COMMAND\`." \
+         "You may need to install GNU coreutils or BusyBox." \
+         "On *BSD, GNU coreutils commands begin with 'g', like 'gsha512sum'." \
+         "See \`rotcheck -h\` for help with usage."
+fi
+
+# When printing text to terminal, make sure it won't do anything unexpected.
+printf_sanitized() {
+    printf '%s' "$@" | tr -d '[:cntrl:]' | iconv -cs -f UTF-8 -t UTF-8
+    printf '\n'
+}
+
+verify_checksums() {
+    IGNORE="" ; [ $IGNORE_MISSING -eq 1 ]  && IGNORE="--ignore-missing"
+    WARN=""   ; [ $WARN_FORMATTING -eq 1 ] && WARN="-w"
+    $COMMAND -c $WARN $IGNORE -- "$CHECKFILE"
+}
+
+# Just verify checksums.
+if [ $CHECK_MODE -eq 1 ]; then
+    # Only GNU coreutils supports `--quiet`, so use `grep -v` instead.
+    # Unfortunately, pipefail isn't POSIX so to return the exit status from the
+    # checksum command, we have to be clever (aka crazy) with file descriptors
+    # and subshells instead.
+    if [ $VERBOSE -eq 1 ]; then
+        verify_checksums
+        exit $?
+    else
+        exec 4>&1
+            (
+                exec 3>&1
+                    (
+                        # 2>&1 preserves order of stdout/stderr.
+                        verify_checksums 2>&1; printf '%d' $? 1>&3
+                    ) | grep -Ev ': OK$' 1>&4
+                exec 3>&-
+            ) | ( read -r retval; exit $retval ); retval=$?
+        exec 4>&-
+        exit $retval
+    fi
+fi
+
+# Delete checksums for files that no longer exist.
+if [ $DELETE_MODE -eq 1 ]; then
+    i=1
+    for file in $(cut -d ' ' -f 3- -- "$CHECKFILE"); do
+        # `sed -i` isn't POSIX (nor is `mktemp`), so use `ex` instead.
+        if [ ! -f "$file" ]; then
+            cat << EOF | ex -s -- "$CHECKFILE"
+${i}d
+x
+EOF
+            # Print what checksums were deleted.
+            if [ $VERBOSE -eq 1 ]; then
+                printf '%s' "DELETED: "
+                printf_sanitized "$file"
+            fi
+        else
+            # Only increment the line number if we didn't delete a line.
+            i=$(($i + 1))
+        fi
+    done
+    exit $?
+fi
+
+# For safety and sanity, ignore all filenames that have control characters
+# like newline, tab, delete etc.
+find_safe() {
+    FIND_L=""
+    FIND_FOLLOW=""
+    if [ $FOLLOW_SYMLINKS -eq 1 ]; then
+        # Old versions of findutils don't have -L. Use it if available.
+        if find -L / -maxdepth 0 -type d >/dev/null 2>/dev/null; then
+            FIND_L="-L"
+        else
+            FIND_FOLLOW="-follow"
+        fi
+    fi
+
+    # POSIX find requires that you specify the search path either first
+    # or immediately after -H/-L. Use current directory by default unless
+    # user has specified a path.
+    FIND_DOT="./"
+    if [ $# -gt 0 ]; then
+        first_char="$(printf '%s' "$1" | cut -c 1)"
+        # Replace search path unless first arg is a non-path `find` option.
+        if [ "$first_char" != "-" ] \
+                && [ "$first_char" != "!" ] && [ "$first_char" != "(" ]; then
+            FIND_DOT=""
+        fi
+    fi
+
+    HIDDEN=""
+    [ $EXCLUDE_HIDDEN -eq 1 ] && HIDDEN='*/\.*'
+
+    find $FIND_L $FIND_DOT "$@" $FIND_FOLLOW \
+        -type f ! -path "$CHECKFILE" ! -path "$HIDDEN" \
+        ! -name "$(printf '*%b*' '\0001')" ! -name "$(printf '*%b*' '\0002')" \
+        ! -name "$(printf '*%b*' '\0003')" ! -name "$(printf '*%b*' '\0004')" \
+        ! -name "$(printf '*%b*' '\0005')" ! -name "$(printf '*%b*' '\0006')" \
+        ! -name "$(printf '*%b*' '\0007')" ! -name "$(printf '*%b*' '\0010')" \
+        ! -name "$(printf '*%b*' '\0011')" ! -name "$(printf '*%b*' '\0012')" \
+        ! -name "$(printf '*%b*' '\0013')" ! -name "$(printf '*%b*' '\0014')" \
+        ! -name "$(printf '*%b*' '\0015')" ! -name "$(printf '*%b*' '\0016')" \
+        ! -name "$(printf '*%b*' '\0017')" ! -name "$(printf '*%b*' '\0020')" \
+        ! -name "$(printf '*%b*' '\0021')" ! -name "$(printf '*%b*' '\0022')" \
+        ! -name "$(printf '*%b*' '\0023')" ! -name "$(printf '*%b*' '\0024')" \
+        ! -name "$(printf '*%b*' '\0025')" ! -name "$(printf '*%b*' '\0026')" \
+        ! -name "$(printf '*%b*' '\0027')" ! -name "$(printf '*%b*' '\0030')" \
+        ! -name "$(printf '*%b*' '\0031')" ! -name "$(printf '*%b*' '\0032')" \
+        ! -name "$(printf '*%b*' '\0033')" ! -name "$(printf '*%b*' '\0034')" \
+        ! -name "$(printf '*%b*' '\0035')" ! -name "$(printf '*%b*' '\0036')" \
+        ! -name "$(printf '*%b*' '\0037')" ! -name "$(printf '*%b*' '\0177')"
+}
+
+find_updated_files() {
+    if [ $FORCE_UPDATE -eq 1 ]; then
+        find_safe "$@"
+    else
+        find_safe "$@" -newer "$CHECKFILE"
+    fi
+}
+
+# This function could be replaced entirely with the much simpler:
+#   cut -d ' ' -f 3- "$CHECKFILE" | grep -Fxn -- "$file" | cut -d ':' -f 1
+# But this function is slightly faster as it avoids passing huge chunks of text
+# (ie, the whole checksum file minus the first column) through a pipe.
+get_line_number() {
+    # Avoid `grep -E` as filename characters might get interpreted (eg, $).
+    for l in $(grep -Fn -- "$file" "$CHECKFILE" | cut -d ':' -f 1); do
+        if sed -n -e "${l}p" -- "$CHECKFILE" \
+                | cut -d ' ' -f 3- | grep -Fxq -- "$file" >/dev/null; then
+            printf '%d' "$l"
+            return 0
+        fi
+    done
+    printf '%d' "0"
+}
+
+umask 077
+# For files with a modification date newer than the checksum file, if there's
+# an existing checksum then update it. Otherwise append a new checksum.
+if [ $UPDATE_MODE -eq 1 ] && [ -f "$CHECKFILE" ]; then
+    for file in $(find_updated_files "$@"); do
+        line_num="$(get_line_number)"
+        if [ ${line_num:-0} -eq 0 ]; then
+            # No checksum yet, so append one.
+            $COMMAND -- "$file" >> "$CHECKFILE"
+        else
+            old="$(sed -n -e "${line_num}p" -- "$CHECKFILE" | cut -d ' ' -f 1)"
+            new="$($COMMAND -- "$file")"
+            # Should never happen, but double check these aren't empty:
+            if [ -z ${old:+x} ] || [ -z ${new:+x} ]; then
+                continue
+            fi
+            # `sed -i` isn't POSIX (nor is `mktemp`), so use `ex` instead.
+            if [ "$old" != "${new%% *}" ]; then
+                cat << EOF | ex -s -- "$CHECKFILE"
+${line_num}c
+$new
+.
+x
+EOF
+                # Bail immediately if something went wrong.
+                [ $? -ne 0 ] && fail "Failed to update checksum file."
+
+                # Print what checksums were changed.
+                if [ $VERBOSE -eq 1 ]; then
+                    printf '%s' "CHANGED: "
+                    printf_sanitized "$file"
+                fi
+            fi
+        fi
+    done
+fi
+
+# Append checksums for files that have no checksum yet.
+if [ $APPEND_MODE -eq 1 ] || [ $UPDATE_MODE -eq 1 ]; then
+    for file in $(find_safe "$@"); do
+        # Avoid `grep -E` as filename characters might get interpreted (eg, $).
+        # The first grep isn't strictly needed, but grep+cut+grep is faster
+        # than just cut+grep here.
+        if [ ! -f "$CHECKFILE" ] || ! grep -- "$file" "$CHECKFILE" \
+                            | cut -d ' ' -f 3- | grep -Fxq -- "$file"; then
+            if ! $COMMAND -- "$file" >> "$CHECKFILE"; then
+                fail "Failed to write to checksum file."
+            fi
+
+            # Print what checksums were appended.
+            if [ $VERBOSE -eq 1 ]; then
+                printf '%s' "ADDED: "
+                printf_sanitized "$file"
+            fi
+        fi
+    done
+fi