lib.sh: more unified config handling

replace it with logic that simply uses "." to load
files directly. for this, "vcfg" is added as a variable
in coreboot target.cfg files, referring to a directory
in config/vendor/ containing a file named pkg.cfg, and
this file then contains the same variables as the
erstwhile config/vendor/sources

config/git files are now directories, also containing
pkg.cfg files each with the same variables as before,
such as repository link and commit hash

this change results in a noticeable reduction in code
complexity within the build system.

unified reading of config files: new function setcfg()
added to lib.sh

setcfg checks if a config exists. if a 2nd argument is
passed, it is used as a return value for eval, otherwise
a string calling err is passed. setcfg output is passed
through eval, to set strings based on config; eval must
be used, so that the variables are set within the same
scope, otherwise they'd be set within setcfg which could
lead to some whacky results.

there's still a bit more more to do, but this single change
results in a substantial reduction in code complexity.

Signed-off-by: Leah Rowe <leah@libreboot.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/config/git/stm32-vserprog/pkg.cfg b/config/git/stm32-vserprog/pkg.cfg
new file mode 100644
index 00000000..9fb12c63
--- /dev/null
+++ b/config/git/stm32-vserprog/pkg.cfg
@@ -0,0 +1,3 @@
+rev="8fcf0a4d41800631b571fa7bbd1d8b251f0a2111"
+url="https://codeberg.org/libreboot/stm32-vserprog"
+bkup_url="https://git.disroot.org/libreboot/stm32-vserprog"