123 lines
3.2 KiB
Go
123 lines
3.2 KiB
Go
package commands
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import (
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"bufio"
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"io"
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"os"
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"strings"
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"github.com/git-lfs/git-lfs/git"
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"github.com/rubyist/tracerx"
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"github.com/spf13/cobra"
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)
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var (
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prePushDryRun = false
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prePushDeleteBranch = strings.Repeat("0", 40)
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)
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// prePushCommand is run through Git's pre-push hook. The pre-push hook passes
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// two arguments on the command line:
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//
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// 1. Name of the remote to which the push is being done
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// 2. URL to which the push is being done
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//
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// The hook receives commit information on stdin in the form:
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// <local ref> <local sha1> <remote ref> <remote sha1>
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//
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// In the typical case, prePushCommand will get a list of git objects being
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// pushed by using the following:
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//
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// git rev-list --objects <local sha1> ^<remote sha1>
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//
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// If any of those git objects are associated with Git LFS objects, those
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// objects will be pushed to the Git LFS API.
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//
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// In the case of pushing a new branch, the list of git objects will be all of
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// the git objects in this branch.
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//
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// In the case of deleting a branch, no attempts to push Git LFS objects will be
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// made.
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func prePushCommand(cmd *cobra.Command, args []string) {
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if len(args) == 0 {
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Print("This should be run through Git's pre-push hook. Run `git lfs update` to install it.")
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os.Exit(1)
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}
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requireGitVersion()
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// Remote is first arg
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if err := cfg.SetValidRemote(args[0]); err != nil {
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Exit("Invalid remote name %q: %s", args[0], err)
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}
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ctx := newUploadContext(prePushDryRun)
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gitscanner, err := ctx.buildGitScanner()
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if err != nil {
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ExitWithError(err)
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}
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defer gitscanner.Close()
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updates := prePushRefs(os.Stdin)
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verifyLocksForUpdates(ctx.lockVerifier, updates)
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for _, update := range updates {
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if err := uploadLeftOrAll(gitscanner, ctx, update); err != nil {
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Print("Error scanning for Git LFS files in %+v", update.Left())
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ExitWithError(err)
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}
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}
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ctx.Await()
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}
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// prePushRefs parses commit information that the pre-push git hook receives:
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//
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// <local ref> <local sha1> <remote ref> <remote sha1>
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//
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// Each line describes a proposed update of the remote ref at the remote sha to
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// the local sha. Multiple updates can be received on multiple lines (such as
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// from 'git push --all'). These updates are typically received over STDIN.
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func prePushRefs(r io.Reader) []*refUpdate {
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scanner := bufio.NewScanner(r)
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refs := make([]*refUpdate, 0, 1)
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// We can be passed multiple lines of refs
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for scanner.Scan() {
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line := strings.TrimSpace(scanner.Text())
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if len(line) == 0 {
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continue
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}
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tracerx.Printf("pre-push: %s", line)
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left, right := decodeRefs(line)
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if left.Sha == prePushDeleteBranch {
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continue
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}
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refs = append(refs, newRefUpdate(cfg.Git, cfg.Remote(), left, right))
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}
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return refs
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}
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// decodeRefs pulls the sha1s out of the line read from the pre-push
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// hook's stdin.
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func decodeRefs(input string) (*git.Ref, *git.Ref) {
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refs := strings.Split(strings.TrimSpace(input), " ")
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for len(refs) < 4 {
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refs = append(refs, "")
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}
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leftRef := git.ParseRef(refs[0], refs[1])
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rightRef := git.ParseRef(refs[2], refs[3])
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return leftRef, rightRef
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}
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func init() {
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RegisterCommand("pre-push", prePushCommand, func(cmd *cobra.Command) {
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cmd.Flags().BoolVarP(&prePushDryRun, "dry-run", "d", false, "Do everything except actually send the updates")
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})
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}
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