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Johnathan Corgan
01be207274
The build image had no git, so build.rs could not read the revision and every binary built through the container carried none: -V printed only the version. The image now installs git, and trusts the source mounted at /src, which is owned by the host user while the build runs as root; without that entry git refuses the repository and the revision is silently empty just the same. The image tag now includes a hash of Dockerfile.build. Before, the tag named only the floor image and the toolchain, so a host with the image cached kept using it after the Dockerfile changed, and this change would never have reached it. A build from a git worktree still has no revision, because the worktree's git directory is outside the mounted tree. That is documented, with the -V reference noting that the revision is omitted when it could not be read, rather than worked around; release and CI builds use full checkouts.