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Simon Law 6db30a10f7 cmd/tailscale: shrink QR codes using half blocks (#17084) ... When running `tailscale up --qr`, the QR code is rendered using two full blocks ██ to form a square pixel. This is a problem for people with smaller terminals, because the output is 37 lines high. All modern terminals support half block characters, like ▀ and ▄, which only takes 19 lines and can easily fit in a regular terminal window. For example, https://login.tailscale.com/a/0123456789 is now rendered: ``` user@host:~$ tailscale up --qr █████████████████████████████████████ █████████████████████████████████████ ████ ▄▄▄▄▄ █ ▀▀ █▄▀▀ ▄ █ ▄▄▄▄▄ ████ ████ █ █ █▀ ▄▄▄█▀█▄▀ ▄█ █ █ ████ ████ █▄▄▄█ ██▄ ▄▀▀▄▄ ▀▀ ▀█ █▄▄▄█ ████ ████▄▄▄▄▄▄▄█ ▀▄▀ █▄▀▄▀▄█ █▄▄▄▄▄▄▄████ ████▄█▄ ▀▄▄▄█▀▄█▀ ▀▄ ▄ ▀▀ ▀▀▄█▄ ████ ████▄▀▄▀▄█▄ █ ▄▄▄▄█▀██▀██▄▄█▀█▄▄▀████ ████▄█▀ ▀ ▄█▄▄▀▄▀█ ▄ ▄█▀█▄▀██▄ ▀▀████ █████▀ ▀ ▄▀▀▀▀▄▀▄▀▀ ▄▄ ▄ ▀ █▄ ▄████ ██████ ▄▄█▄▄▄▄▄▀ █ ▄▀▀▄█▀ █ ▄ ▀ █████ ████▄█▄▄ ▄▀ ▀██▀ ▄█▀▀████▄▀█ ██████ █████▄▄▄█▄▄▄▀▀ █▄▄▄▄▄ ▀█ ▄▄▄ ▀▀████ ████ ▄▄▄▄▄ █ ██▄ ▀ █▀█ ▄ █▄█ █▄█████ ████ █ █ █▀ █ ▀█▄▄ █▀ ▄ ▀▄▀▄████ ████ █▄▄▄█ █▄█▀█▄▀██▀██▄ ▀█▄▀▀▄▀▄████ ████▄▄▄▄▄▄▄█▄▄███▄▄▄███▄▄▄██▄██▄█████ █████████████████████████████████████ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ``` To render a QR code with full blocks, like we did in the past, use the new `--qr-format` flag: ``` user@host:~$ tailscale up --qr --qr-format=large ██████████████████████████████████████████████████████████████████████████ ██████████████████████████████████████████████████████████████████████████ ██████████████████████████████████████████████████████████████████████████ ██████████████████████████████████████████████████████████████████████████ ████████ ██ ████ ██ ████ ██ ████████ ████████ ██████████ ██ ████ ██ ██ ██████████ ████████ ████████ ██ ██ ████ ██████ ██ ██ ██ ██ ████████ ████████ ██ ██ ██ ████████ ████ ████ ██ ██ ████████ ████████ ██ ██ ████ ████ ████ ████ ██ ██ ████████ ████████ ██████████ ██████ ██ ████ ██ ██████████ ████████ ████████ ██ ██ ██ ██ ██ ██ ██ ██ ████████ ████████████████████████ ██ ████ ██ ████ ████████████████████████ ████████ ██ ██ ████ ████ ██ ████ ████ ██ ████████ ██████████████ ████████ ████ ██ ██ ██████ ████████ ████████ ██ ██ ██ ██ ██████████████ ██████ ██████████ ██████████ ██ ██████ ██ ██████████ ████ ██████████ ██████ ████████ ████████ ████ ██ ██ ██ ████ ██████ ██████ ████████████ ████████████ ████████ ██ ██ ██ ████ ████ ██████ ████████ ████████████ ██ ████████ ██ ████ ██ ██ ████████ ██████████ ██ ██ ██ ████ ██ ████ ██████████ ████████████ ██ ██ ██ ████ ████ ██ ██ ██████████ ████████████ ████████████████ ██ ██ ████ ██ ██ ██████████ ████████ ██ ██ ████████ ██████████████ ████ ████████████ ████████████████ ██ ████ ████ ██████████ ██ ████████████ ██████████ ██ ████ ██ ████ ████████████ ████████████████████████ ████████████ ██ ██████ ████████ ████████ ██ ████ ██ ██████ ██ ██ ██ ██████████ ████████ ██████████ ██ ██████ ██ ██ ██ ██████ ██████████████ ████████ ██ ██ ████ ██ ████ ████ ██ ██ ████████ ████████ ██ ██ ██ ██ ██████ ██ ██ ██ ██████████ ████████ ██ ██ ██ ██████ ████████████ ████ ████ ██ ████████ ████████ ██████████ ██████ ████ ████ ██████ ████ ██ ██████████ ████████ ██ ██████ ██████ ████ ████ ██████████ ██████████████████████████████████████████████████████████████████████████ ██████████████████████████████████████████████████████████████████████████ ██████████████████████████████████████████████████████████████████████████ ██████████████████████████████████████████████████████████████████████████ ``` Fixes #17083 Signed-off-by: Simon Law <sfllaw@tailscale.com>		3 months ago
..
addlicense	all: fix golangci-lint errors	12 months ago
build-webclient	client/web: precompress assets	2 years ago
checkmetrics	cmd/checkmetrics: add command for checking metrics against kb	1 year ago
cloner	cmd/viewer, types/views: implement support for json/v2 (#16852)	4 months ago
connector-gen	cmd/connector-gen: add helper tool for wide app connector configurations	2 years ago
containerboot	cmd/containerboot: do not reset state on non-existant secret (#17021)	4 months ago
derper	cmd/derper: add start of ACE support	3 months ago
derpprobe	cmd/derpprobe,prober: add run all probes handler (#16875)	4 months ago
dist	{cmd/dist,release/dist}: add support for intermediary QNAP signing certificates	4 months ago
featuretags	feature/featuretags: add auto-generated constants for all modular features	3 months ago
get-authkey	cmd,tsnet,internal/client: create internal shim to deprecated control plane API	10 months ago
gitops-pusher	scripts/check_license_headers.sh: delete, rewrite as a Go test	6 months ago
hello	cmd/hello: display native ipv4 (#15191)	10 months ago
k8s-nameserver	cmd/k8s-nameserver: fix AAAA record query response (#12412)	2 years ago
k8s-operator	feature/portmapper: make the portmapper & its debugging tools modular	3 months ago
k8s-proxy	cmd/k8s-proxy,k8s-operator: fix serve config for userspace mode (#16919)	4 months ago
mkmanifest	cmd/mkmanifest, cmd/tailscale, cmd/tailscaled: remove Windows arm32 resources from OSS	3 years ago
mkpkg	go.mod: upgrade nfpm to v2 (#8786)	2 years ago
mkversion	version/mkversion: open-source version generation logic	3 years ago
nardump	cmd/nardump: support symlinks, add basic test	9 months ago
natc	cmd/natc,tsconsensus: add cluster config admin	4 months ago
netlogfmt	all: use Go 1.22 range-over-int	2 years ago
nginx-auth	tailcfg,all: add and use Node.IsTagged()	3 years ago
omitsize	feature/portmapper: make the portmapper & its debugging tools modular	3 months ago
pgproxy	all: use new LocalAPI client package location	11 months ago
printdep	cmd/printdep: print correct toolchain URL	3 years ago
proxy-test-server	net/tlsdial: fix TLS cert validation of HTTPS proxies	6 months ago
proxy-to-grafana	scripts/check_license_headers.sh: delete, rewrite as a Go test	6 months ago
sniproxy	net/{netx,memnet},all: add netx.DialFunc, move memnet Network impl	9 months ago
speedtest	all: update copyright and license headers	3 years ago
ssh-auth-none-demo	ssh,tempfork/gliderlabs/ssh: replace github.com/tailscale/golang-x-crypto/ssh with golang.org/x/crypto/ssh	11 months ago
stunc	cmd/stunc: enforce read timeout deadline (#14309)	1 year ago
stund	go.toolchain.branch: bump to go1.25 (#16954)	4 months ago
stunstamp	cmd/stunstamp: add protocol context to timeout logs (#13422)	1 year ago
sync-containers	all: adjust some build tags for plan9	2 years ago
systray	client/systray: allow specifying tailscaled socket	5 months ago
tailscale	cmd/tailscale: shrink QR codes using half blocks (#17084)	3 months ago
tailscaled	feature/featuretags, all: add ts_omit_acme to disable TLS cert support	3 months ago
testcontrol	all: use Go 1.22 range-over-int	2 years ago
testwrapper	.github/workflows: shard the Windows builder	6 months ago
tl-longchain	all: use new LocalAPI client package location	11 months ago
tsconnect	health,ipn/ipnlocal: introduce eventbus in heath.Tracker (#17085)	3 months ago
tsidp	feature/portmapper: make the portmapper & its debugging tools modular	3 months ago
tsshd	all: update copyright and license headers	3 years ago
tta	all: use new LocalAPI client package location	11 months ago
viewer	cmd/viewer: add field comments to generated view methods	4 months ago
vnet	cmd/vnet: add wsproxy mode	9 months ago
xdpderper	tsweb: split promvarz into an optional dependency	9 months ago