make things work for older renv versions too

Author: lorenzwalthert

inst/update-renv-prepare.R

@@ -1,5 +1,10 @@
+# emulate renv::lockfile_read()$R$Repositories$RSPM, which is not available on previous version of renv
+
 options(
-  repos = c(RSPM = renv::lockfile_read()$R$Repositories$RSPM), # CRAN is not an option, always use PPM
+  repos = c(RSPM = {
+    all_repos <- jsonlite::read_json("renv.lock")$R$Repositories
+    all_repos[sapply(all_repos, \(x) x$Name == "RSPM")][[1]]$URL
+  }), # CRAN is not an option, always use PPM
   install.packages.check.source = "no", # don't check if source packages are available
   install.packages.compile.from.source = "never" # probably redundant with the above 'no': If source package is available, only use source if no code needs to be compiled (needs compilation flag on CRAN).
 )