DEV Community: Slava "nerfur" Voronzoff

I was system operator of Fidonet node from Russia, Ask Me Anything!

Slava "nerfur" Voronzoff — Tue, 02 Apr 2019 06:29:49 +0000

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Easy make and Makefile for beginners

Slava "nerfur" Voronzoff — Sun, 13 Jan 2019 11:55:29 +0000

make is one of the most important tools in programming. Both in past and present days. But also pretty scary, because many beginners see only Makefile from already established and big projects with huge amount of lines inside.

Don't be afraid! Basic Makefile is pretty easy after this short "trick".

For example let's imagine you have command line to compile your little C code like this:

gcc -I/usr/local/include -L/usr/local/lib -Wall -o my-c-app.out my-c-app.c

just open your favorite text editor and paste this command inside

now you just need to split it to sort of variables for make, you can choose names you want (there are some common practices, btw)
let's split it

CC = gcc

OBJECTS = my-c-app.c

OBJECT_OUT = my-c-app.out

CFLAGS = -Wall

INCLUDES = -I/usr/local/include -L/usr/local/lib

and swap values in your command with this variables

$(CC) $(INCLUDES) $(CFLAGS) -o $(OBJECT_OUT) $(OBJECTS)

and last touch - we need to add target for make - default one is all

so we transform our command line to
all: $(OBJECTS)
$(CC) $(INCLUDES) $(CFLAGS) -o $(OBJECT_OUT) $(OBJECTS) (this line always MUST start with Tab !!!)

so, now we have file like this

CC = gcc

OBJECTS = my-c-app.c

OBJECT_OUT = my-c-app.out

CFLAGS = -Wall

INCLUDES = -I/usr/local/include -L/usr/local/lib

all: $(OBJECTS)
    $(CC) $(INCLUDES) $(CFLAGS) -o $(OBJECT_OUT) $(OBJECTS)

now you can run make and enjoy beginning of your dive to Makefile magic!

Good Luck!

How to (re-)install OpenBSD on old disklabel

Slava "nerfur" Voronzoff — Sat, 12 Jan 2019 18:55:14 +0000

Once I found my good old samsung netbook (little NC10 model, it was amazing laptop for my needs) and found that it has good old OpenBSD (I expected that).

But problem arise... it was really old 5.7 version. Time to update! But how? Official FAQ only supports close versions upgrades. Do it step by step? Too much time... Reinstall! But I don't remember, maybe something important already exists at home.

I quickly check documentation and can't find info how to preserve one of disklabel partitions while installing... but I found how it can be achieved.

IMPORTANT. I ALWAYS USE SEPARATED PARTITIONS FOR /HOME AND RECOMMEND IT TO YOU!

Boot your installation media, get to fdisk part
Choose O for using already existing OpenBSD disk partition.
Next page will be default auto disklabel...

DONTPANIC;)

Just choose [C]ustom layout, check with 'p' that you see your old disklabels, now use 'n' to set mount points for all labels that you WANT to format.

!!! DONT TOUCH LABEL(s) THAT YOU WANT TO SAVE DATA ON !!!

after setting all mount points for "new" labels use 'q' to save&exit and watch how only "mounted" labels got formated :)

Continue installation and don't forget to fix /mnt/etc/fstab for other mount points before reboot.

Voila!