STRLCPY/cdebug

Add demo
Ivan Velichko committed 2 years ago

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README.md

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2	2
3	3		Work in progres...
4	4
	5	+	## Demo
	6	+
	7	+	The command is very similar to `docker exec`. You point it to the target container,
	8	+	potentially ask the session to be interactive (`-it`), and specify the debugging
	9	+	toolkit image (`busybox` or anything starting from `nixery.dev/shell`).
	10	+
	11	+	Important: The target container isn't recreated and/or restarted. And no extra
	12	+	volumes is needed.
	13	+
	14	+	Notice, how the debugger's shell actually has the original distroless rootfs as it's root directory:
	15	+
	16	+	```sh
	17	+	$ docker run -d --rm \
	18	+	--name my-distroless gcr.io/distroless/nodejs \
	19	+	-e 'setTimeout(() => console.log("Done"), 99999999)'
	20	+
	21	+	$ go run main.go exec -it my-distroless
	22	+	{"status":"Pulling from library/busybox","id":"latest"}
	23	+	{"status":"Digest: sha256:9810966b5f712084ea05bf28fc8ba2c8fb110baa2531a10e2da52c1efc504698"}
	24	+	{"status":"Status: Image is up to date for busybox:latest"}
	25	+	+ rm -rf /proc/1/root/.cdebug
	26	+	+ ln -s /proc/55/root/bin/ /proc/1/root/.cdebug
	27	+	+ export 'PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/.cdebug'
	28	+	+ chroot /proc/1/root sh
	29	+	/ # ls -lah
	30	+	total 60K
	31	+	drwxr-xr-x 1 root root 4.0K Oct 17 23:49 .
	32	+	drwxr-xr-x 1 root root 4.0K Oct 17 23:49 ..
	33	+	lrwxrwxrwx 1 root root 18 Oct 17 23:49 .cdebug -> /proc/55/root/bin/
	34	+	-rwxr-xr-x 1 root root 0 Oct 17 19:49 .dockerenv
	35	+	drwxr-xr-x 2 root root 4.0K Jan 1 1970 bin
	36	+	drwxr-xr-x 2 root root 4.0K Jan 1 1970 boot
	37	+	drwxr-xr-x 5 root root 340 Oct 17 19:49 dev
	38	+	drwxr-xr-x 1 root root 4.0K Oct 17 19:49 etc
	39	+	drwxr-xr-x 3 nonroot nonroot 4.0K Jan 1 1970 home
	40	+	drwxr-xr-x 1 root root 4.0K Jan 1 1970 lib
	41	+	drwxr-xr-x 2 root root 4.0K Jan 1 1970 lib64
	42	+	drwxr-xr-x 5 root root 4.0K Jan 1 1970 nodejs
	43	+	dr-xr-xr-x 191 root root 0 Oct 17 19:49 proc
	44	+	drwx------ 1 root root 4.0K Oct 17 19:55 root
	45	+	drwxr-xr-x 2 root root 4.0K Jan 1 1970 run
	46	+	drwxr-xr-x 2 root root 4.0K Jan 1 1970 sbin
	47	+	dr-xr-xr-x 13 root root 0 Oct 17 19:49 sys
	48	+	drwxrwxrwt 2 root root 4.0K Jan 1 1970 tmp
	49	+	drwxr-xr-x 1 root root 4.0K Jan 1 1970 usr
	50	+	drwxr-xr-x 1 root root 4.0K Jan 1 1970 var
	51	+	```
	52	+

Add demo