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author | Junio C Hamano <gitster@pobox.com> | 2011-03-15 14:22:16 -0700 |
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committer | Junio C Hamano <gitster@pobox.com> | 2011-03-15 14:22:16 -0700 |
commit | ccf6d62d1e8d9a725b4c5a374c2d0e2cd01dd6a7 (patch) | |
tree | 566babe2b10ed9b4d25748777f6002b0c0d2f82e /builtin | |
parent | Merge branch 'jh/maint-do-not-track-non-branches' (diff) | |
parent | commit: give final warning when reattaching HEAD to leave commits behind (diff) | |
download | tgif-ccf6d62d1e8d9a725b4c5a374c2d0e2cd01dd6a7.tar.xz |
Merge branch 'jc/checkout-orphan-warning'
* jc/checkout-orphan-warning:
commit: give final warning when reattaching HEAD to leave commits behind
Diffstat (limited to 'builtin')
-rw-r--r-- | builtin/checkout.c | 101 |
1 files changed, 95 insertions, 6 deletions
diff --git a/builtin/checkout.c b/builtin/checkout.c index cc97dbc30f..2bf02f2841 100644 --- a/builtin/checkout.c +++ b/builtin/checkout.c @@ -582,6 +582,100 @@ static void update_refs_for_switch(struct checkout_opts *opts, report_tracking(new); } +struct rev_list_args { + int argc; + int alloc; + const char **argv; +}; + +static void add_one_rev_list_arg(struct rev_list_args *args, const char *s) +{ + ALLOC_GROW(args->argv, args->argc + 1, args->alloc); + args->argv[args->argc++] = s; +} + +static int add_one_ref_to_rev_list_arg(const char *refname, + const unsigned char *sha1, + int flags, + void *cb_data) +{ + add_one_rev_list_arg(cb_data, refname); + return 0; +} + + +static void describe_one_orphan(struct strbuf *sb, struct commit *commit) +{ + struct pretty_print_context ctx = { 0 }; + + parse_commit(commit); + strbuf_addstr(sb, " - "); + pretty_print_commit(CMIT_FMT_ONELINE, commit, sb, &ctx); + strbuf_addch(sb, '\n'); +} + +#define ORPHAN_CUTOFF 4 +static void suggest_reattach(struct commit *commit, struct rev_info *revs) +{ + struct commit *c, *last = NULL; + struct strbuf sb = STRBUF_INIT; + int lost = 0; + while ((c = get_revision(revs)) != NULL) { + if (lost < ORPHAN_CUTOFF) + describe_one_orphan(&sb, c); + last = c; + lost++; + } + if (ORPHAN_CUTOFF < lost) { + int more = lost - ORPHAN_CUTOFF; + if (more == 1) + describe_one_orphan(&sb, last); + else + strbuf_addf(&sb, " ... and %d more.\n", more); + } + + fprintf(stderr, + "Warning: you are leaving %d commit%s behind, " + "not connected to\n" + "any of your branches:\n\n" + "%s\n" + "If you want to keep them by creating a new branch, " + "this may be a good time\nto do so with:\n\n" + " git branch new_branch_name %s\n\n", + lost, ((1 < lost) ? "s" : ""), + sb.buf, + sha1_to_hex(commit->object.sha1)); + strbuf_release(&sb); +} + +/* + * We are about to leave commit that was at the tip of a detached + * HEAD. If it is not reachable from any ref, this is the last chance + * for the user to do so without resorting to reflog. + */ +static void orphaned_commit_warning(struct commit *commit) +{ + struct rev_list_args args = { 0, 0, NULL }; + struct rev_info revs; + + add_one_rev_list_arg(&args, "(internal)"); + add_one_rev_list_arg(&args, sha1_to_hex(commit->object.sha1)); + add_one_rev_list_arg(&args, "--not"); + for_each_ref(add_one_ref_to_rev_list_arg, &args); + add_one_rev_list_arg(&args, "--"); + add_one_rev_list_arg(&args, NULL); + + init_revisions(&revs, NULL); + if (setup_revisions(args.argc - 1, args.argv, &revs, NULL) != 1) + die("internal error: only -- alone should have been left"); + if (prepare_revision_walk(&revs)) + die("internal error in revision walk"); + if (!(commit->object.flags & UNINTERESTING)) + suggest_reattach(commit, &revs); + else + describe_detached_head("Previous HEAD position was", commit); +} + static int switch_branches(struct checkout_opts *opts, struct branch_info *new) { int ret = 0; @@ -609,13 +703,8 @@ static int switch_branches(struct checkout_opts *opts, struct branch_info *new) if (ret) return ret; - /* - * If we were on a detached HEAD, but have now moved to - * a new commit, we want to mention the old commit once more - * to remind the user that it might be lost. - */ if (!opts->quiet && !old.path && old.commit && new->commit != old.commit) - describe_detached_head("Previous HEAD position was", old.commit); + orphaned_commit_warning(old.commit); update_refs_for_switch(opts, &old, new); |