this post was submitted on 22 Jan 2025
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    1108
    Let's start some fights (lemmy.world)
    submitted 13 hours ago by [email protected] to c/[email protected]
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    [–] [email protected] 22 points 10 hours ago (1 children)

    mostly enterprise people

    [–] [email protected] 7 points 9 hours ago (2 children)

    But, like, is for support and stuff, no?

    [–] [email protected] 36 points 9 hours ago (2 children)

    A lot of industries are semi-forced into it. Let me give you an example I know of first-hand. Modern SAP stacks support 3 operating systems. Windows Server, RHEL, and SuSE.

    You're probably thinking to yourself: "but rhel is just regular linux, surely you can install it on anything if you have the appropriate dependencies, I'll bet it even just works on rhel-compatibles like rocky, alma, or centos stream!"

    And you would be ~sort of~ right, but wrong in the most dystopian way possible. The installer itself does hardcoded checks for "compatible" operating systems, using /etc/os-release and a few other common system files. Spoofing those to rhel 8.5 or whatever is easy enough, but the one that really gets you is a dependency for compat-glibc-X.Y-ZZZZ.x86_64. This "glibc compatibility library" is conveniently only accessible via a super special redhat repository granted by a super special sap license (which is like ~$2,000/year/cpu). Looking at the redhat sources it is actually just a bog-standard semi-modern glibc compile with nothing special. The only other thing you get with this license as far as I can tell is another metapackage that installs dependencies, and makes a few kernel tweaks recommended by SAP.

    So you can install it on alma/rocky by impersonating rhel in /etc/os-release, and then compiling a version of glibc and linking it in a special hardcoded location, but SAP/Redhat put as many roadblocks in your way as possible to do this. It took me weeks of reverse-engineering the installer to get our farm off of the ~100k/yr that redhat wanted to charge us for essentially:

    ./configure --enable-bootstrap --enable-languages=c,c++,lto --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --enable-plugin --with-linker-hash-style=gnu --enable-initfini-array --disable-libquadmath --disable-libsanitizer --disable-libvtv --disable-libgomp --disable-libitm --disable-libssp --disable-libatomic --disable-libcilkrts --without-isl --disable-libmpx --enable-gnu-indirect-function --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux
Thread model: posix
gcc version 9.1.1 20190605 (Red Hat 9.1.1-2) (GCC)

    definitely worth $100,000/yr... much capitalism, many line go up

    [–] [email protected] 16 points 9 hours ago (1 children)

    Finally... I found it... Evil Linux...

    [–] [email protected] 1 points 3 hours ago (1 children)

    There is nothing evil about it? Like sources are available, rhel itself is cheap and actually invests a lot in oss. If you want an unsupported system you are free to do something like this.

    [–] [email protected] 1 points 3 hours ago

    I said evil as in the meme, like the evil version of something is its total opposite. And RHEL sound like the total opposite of what I associate whit Linux.

    [–] [email protected] 4 points 6 hours ago* (last edited 6 hours ago) (1 children)

    I assumed that you could just run fedora and spoof RHEL. The fact that you need to use a specific GCC is insane. They must share their source code right? Or, are they no longer sharing it as they are legally required to?

    Anyways, RHEL is deep suck.

    [–] [email protected] 1 points 4 hours ago

    The source to this compat library is in their sources last I checked, but because it's not part of their standard repos it doesn't technically have to be. I suspect this is eventually the end-goal.

    [–] [email protected] 10 points 9 hours ago (1 children)

    RHEL is subscription based. Not just support anymore. Also for product.

    [–] [email protected] 5 points 9 hours ago

    Don't know what to think about it... 😬