Support using the PKGBUMPING variable set by pkgbump/pkgdiff-mg to avoid
respectively fetching and unpacking crates, to speed up using these
tools.

Signed-off-by: Michał Górny <mgo...@gentoo.org>
---
 eclass/cargo.eclass | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/eclass/cargo.eclass b/eclass/cargo.eclass
index 1e1a6e3ddfe2..b66b7247bd97 100644
--- a/eclass/cargo.eclass
+++ b/eclass/cargo.eclass
@@ -175,6 +175,9 @@ ECARGO_VENDOR="${ECARGO_HOME}/gentoo"
 # If no arguments are provided, it uses the CRATES variable.
 # The value is set as CARGO_CRATE_URIS.
 _cargo_set_crate_uris() {
+       # when called by pkgbump, do not fetch crates
+       [[ ${PKGBUMPING} == ${PVR} ]] && return
+
        local -r regex='^([a-zA-Z0-9_\-]+)-([0-9]+\.[0-9]+\.[0-9]+.*)$'
        local crates=${1}
        local crate
@@ -331,6 +334,9 @@ cargo_src_unpack() {
        for archive in ${A}; do
                case "${archive}" in
                        *.crate)
+                               # when called by pkgdiff-mg, do not unpack 
crates
+                               [[ ${PKGBUMPING} == ${PVR} ]] && continue
+
                                ebegin "Loading ${archive} into Cargo registry"
                                tar -xf "${DISTDIR}"/${archive} -C 
"${ECARGO_VENDOR}/" || die
                                # generate sha256sum of the crate itself as 
cargo needs this
-- 
2.43.0


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