doc: chapter "Building from Git" in "Contributing" misses to list required packages

Hi!

The chapter "Building form Git" starts with two git commands to clone and verify the code. Unfortunately it misses to mention before that two packages are required for this to be working: git and gnupg.

While the former is obvious, the gnupg package is not that obvious. If you missed to install it, then the "git verify-commit" prints some error messages with "error: cannot run gpg". And unfortunately gpg is not the package name to install to solve this error.

It would be beneficial, if the two required packages git (or git-minimal?) and gnupg would be mentioned before starting with commands which would fail otherwise.

It would further help to repeat the wget command from the installation section to fetch the keys necessary for this verification, as there are other numbers printed beside the mentioned 3CE4645…

However that wget command requires yet another package to be installed: wget.

Finally trying to verify commit f84b0363053e5479464f6ce6ded45f80360d90fc it leaves this unresolved key:

gpg: Signatur vom Sa 28 Mär 2020 21:30:07 CET

gpg: mittels RSA-Schlüssel 39B33C8D94480D2DDCC2A4988B44A0CDC7B956F2

gpg: Signatur kann nicht geprüft werden: Kein öffentlicher Schlüssel

The next command mentioned then is "make authenticate". It fails because the make package first needs to be installed. But even if this is done, it fails with "make: *** Keine Regel, um „authenticate“ zu erstellen. Schluss." There has yet no Makefile been created.

Further down the commands "./bootstrap" and ".configure" are mentioned, which are both required to create the needed Makefile. But to be able to run this, all the listed dependencies need to be installed.

Only after struggling down to the failing "make authenticate" there is the finally helpful command "guix environment guix —pure".

So to sum it all up: the packages to install and missed to mention are

• git (or git-minimal?)

• gnupg

• wget

The wget command to download the key should ideally be repeated. The "make authenticate" command is not helpful at all to be mentioned that early.

It would instead be very helpful, if first "guix environment guix —pure" would be mentioned, and if this (or a similar command) would also provide git, gnupg and wget to be able to fetch and verify the source code of guix as described by the first two commands "git clone …" and "git verify-commit …".

The "make authenticate" command must not be mentioned before but only after the "./bootstrap" and "./configure" commands. Both "./bootstrap" and "./configure" should ideally be boxed like the other commands. This boxing would also help the important argument "--localstatedir=/var" to not be overseen.

In my case after all this and running ".configure" successfully, "make authenticate" still failed, because I relied on "guix environment guix —pure" to have a dependency to gnupg to have the gpg command accessible, which is unfortunately not the case.

I then exited the environment and started a new one with "guix environment guix --pure --ad-hoc gnupg" and ran "make authenticate" now with this result:

stefan@guix ~/development/guix [env]$ make authenticate

Authenticating Git checkout...

Authenticating d68de95 to f84b036 (14629 commits)...

[### ]Backtrace:

12 (apply-smob/1 #<catch-closure 3e6b3140>)

In ice-9/boot-9.scm:

705:2 11 (call-with-prompt _ _ #<procedure default-prompt-handle?>)

In ice-9/eval.scm:

619:8 10 (_ #(#(#<directory (guile-user) 3e77d140>)))

293:34 9 (_ #(#(#(#(#(#(#(#(#(#(#<?> ?) ?) ?) ?) ?) ?) ?) ?) ?) ?))

In ice-9/boot-9.scm:

142:2 8 (dynamic-wind _ _ #<procedure stop ()>)

152:2 7 (with-fluid* _ _ _)

In srfi/srfi-1.scm:

466:18 6 (fold #<procedure 45b346c0 at ice-9/eval.scm:336:13 (a?> ?)

In ice-9/eval.scm:

293:34 5 (_ #(#(#<directory (guile-user) 3e77d140> #<proce?> ?) ?))

619:8 4 (_ #(#(#(#<directory (guile-user) 3e77d140>) #<gi?> ?) ?))

626:19 3 (_ #(#(#(#<directory (guile-user) 3e77d140>) #<gi?> ?) ?))

In ice-9/boot-9.scm:

152:2 2 (with-fluid* _ _ _)

142:2 1 (dynamic-wind #<procedure 45cb9240 at ice-9/eval.scm:3?> ?)

142:2 0 (dynamic-wind #<procedure 45cb9100 at ice-9/eval.scm:3?> ?)

ice-9/boot-9.scm:142:2: In procedure dynamic-wind:

Throw to key `srfi-34' with args `(#<condition &message [message: "could not authenticate commit 77704cb13e5bebf412297dab764a00849a3cfdc0: key A0C5E3522EF8EF5C64CDB7F0FD73CAC719D32566 is missing"] 45cbb800>)'.

make: *** [Makefile:5895: authenticate] Error 1

The documentation then finally suggest to run "make check". Isn't the actual build step with "make" missing?

I'm currently using

guix describe

Generation 5 28. März 2020 18:44:49 (aktuell)

guix e425713

Repository-URL: https://git.savannah.gnu.org/git/guix.git

Branch: master

Commit: e4257138fe1d924c56c9979b75319585b9251fb7

My profile is empty, no installed packages – I removed all packages again after obtaining the source code and before running "guix environment guix --pure --ad-hoc gnupg".

Bye

Stefan