Uses/cargo: Rework git source support based on patch-in-config sections

Git sources from `Cargo.lock` are added to `CARGO_CRATES` through
the normal mechanism of `make cargo-crates` by the porter.  They
are used to populate `MASTER_SITES`, `DISTFILES` with static
git-archive(1) tarballs a la `USE_GITHUB`, `USE_GITLAB`.  In the
configure phase we generate `[patch]` sections in the config file
which will cause `cargo update` to auto-update `Cargo.lock` to point
to the appropriate extraction directories.

Normally `cargo update` would connect to the network to update all
Git sources but since rust-1.55.0 our cargo has been patched to
skip this when `CARGO_FREEBSD_PORTS_SKIP_GIT_UPDATE` is set in the
environment.

This replaces the old `CARGO_USE_GITHUB`, `CARGO_USE_GITLAB` hacks
where this was done by editing all `Cargo.toml` with sed(1) calls.

Additionally, we try to automatically infer the individiual crate
sub-directories inside the Git sources based on `package.name` in
`Cargo.toml` to remove the need for `CARGO_GIT_SUBDIR`.

USES=cargo also now sets `WRKSRC_crate_$name` for each crate to
point to the crate extraction directories.

PR:		256581
Reviewed by:	jbeich

1 files changed, 20 insertions, 0 deletions

diff --git a/Mk/Scripts/cargo-crates-git-fetch.awk b/Mk/Scripts/cargo-crates-git-fetch.awk
new file mode 100644
index 000000000000..241b6d3b72f2
--- /dev/null
+++ b/Mk/Scripts/cargo-crates-git-fetch.awk
@@ -0,0 +1,20 @@
+# MAINTAINER: rust@FreeBSD.org
+#
+# Return (index, site, filename, wrksrc, crates) 5-tuples from git URL specs in CARGO_CRATES
+
+END {
+	split(GIT_SOURCES, git_sources)
+	for (i = 1; i <= length(git_sources); i++) {
+		git_source = git_sources[i]
+		j = index(git_source, "@")
+		if (j == 0) {
+			warn("invalid source: %s", git_source)
+		} else {
+			crate_source = substr(git_source, j + 1)
+			crates = substr(git_source, 0, j - 1)
+			if (split_git_url(git_info, crate_source)) {
+				printf("%d %s %s %s %s\n", group++, git_info["site"], git_info["filename"], git_info["dir"], crates)
+			}
+		}
+	}
+}