There is already a check for invalid reference, however `git rev-parse
reference` doesn't fail on unknown commit hash unless `^{object}`
peeling operator is used (`^{commit}` can be used as well).
Change-Id: I7ef39aeee2e902ac2fad6ac41b546c47418e1dec
Signed-off-by: Sergii Dmytruk <sergii.dmytruk@3mdeb.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84292
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
ffc48178de