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Added
git-sync convert-sha256: one-off conversion that fetches a pack over smart HTTP from a SHA1 source, walks every reachable object via a two-pass topological DFS, and writes a fresh SHA256 bare repository with every tree/commit/tag reference re-encoded — including abbreviated SHA1 prefixes in commit messages. All branches and tags are always converted to avoid stranding cross-branch references; sharp edges and operational characteristics are documented in docs/convert-sha256.md (#66)
Changed
HTTP auth now matches git's own flow: try anonymous first and only consult the credential helper after a 401, instead of proactively running git credential fill for every endpoint. This stops git-sync from dropping into an interactive Username:/Password: prompt on unauthenticated hosts and from leaking tokens to public repos. Expired credentials (401, or 403 from token services like Cloudflare) trigger a helper reject so the next run starts clean; the helper runs with GIT_TERMINAL_PROMPT=0 to fail fast rather than block on a tty (#65)
Outbound requests now identify git-sync in the User-Agent instead of advertising only go-git's default. Git wire-protocol traffic (smart-HTTP info-refs, upload-pack/receive-pack, and the protocol v2 agent= capability) sends git-sync/<version> go-git/<v> to preserve go-git attribution; non-git HTTP (the GitHub repo metadata call during bootstrap) sends just git-sync/<version>. A new internal/useragent package centralises the format, wired from versioninfo.Version at startup so --version and the User-Agent agree, and overridable by SDK consumers (#69)
Bootstrap planning streams the commit-graph fetch instead of materializing the full commit set: a new ExtractCommitParents path parses the tree:0 pack incrementally, extracting only (commit -> parent hashes) tuples with a bounded LRU for delta resolution. On torvalds/linux this cut peak Go heap from 5.42 GiB to 1.47 GiB (-73%), peak RSS from 5.69 GiB to 1.63 GiB (-71%), and wall time from 32m to 19m (-40%) (#61)
Fixed
Materialized push against CDN-fronted HTTP targets (e.g. Cloudflare) no longer fails mid-upload with use of closed network connection. Two independent causes: a stale keep-alive pool entry expiring on the CDN edge during the gap between info-refs and receive-pack (fixed by disabling keep-alives on the default transport), and a mid-stream stall while go-git ran delta selection synchronously inside Encode() (fixed via packfile.WithObjectSelector to run selection up front and stream the write phase through io.Pipe). Adds GITSYNC_HTTP_TRACE=1 for per-request lifecycle tracing with redacted auth, plus in-place verbose progress for the materialized encode/write phases (#64)
