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feat(firmware): wire libgit2 component + bind git2 in system mode

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Adds the extra_components metadata, git2 as an optional dep behind the
`git` feature (default-features off -> no openssl-sys/libssh2-sys), and a
git_smoke bin gated on it. libgit2-sys/libz-sys run in system mode against
fake pkg-config files (empty Libs) so they emit no link flags -- symbols
come from the esp-idf component. Proven on device: git2 version + a blob
SHA1 through the mbedTLS backend.
This commit is contained in:
Julien Calixte
2026-07-05 21:28:47 +02:00
parent bea3058004
commit 2b268fe168
4 changed files with 99 additions and 0 deletions
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14
firmware/pkgconfig/libgit2.pc Normal file
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# Fake pkg-config file for the libgit2 esp-idf component (Spike 7, Path 2).
#
# libgit2-sys in system mode (LIBGIT2_NO_VENDOR=1) probes for a system libgit2
# via pkg-config; without one it aborts, with one it emits link flags. We don't
# want it to build OR link anything — esp-idf already builds liblibgit2.a and
# puts it in the final link group (that's how git_smoke's 538 symbols resolved).
# So this .pc makes the probe *succeed* (right version, in range [1.9.4,1.10.0))
# while emitting NOTHING (empty Libs/Cflags). The symbols come from the
# component; libgit2-sys supplies only its hand-written Rust bindings.
Name: libgit2
Description: libgit2 built as an esp-idf component (mbedTLS)
Version: 1.9.4
Libs:
Cflags: