fast export and import fixes and features

This is a series of small fixes and features for fast-export and fast-import, mostly on the fast-export side.

Changes since v2 (full range-diff below):
* Dropped the final patch; going to try to use Peff's suggestion of rev-list and diff-tree to get what I need instead
* Inserted a new patch at the beginning to convert pre-existing sha1 stuff to oid (rename sha1_to_hex() -> oid_to_hex(), rename anonymize_sha1() to anonymize_oid(), etc.)
* Modified other patches in the series to add calls to oid_to_hex() rather

    than sha1_to_hex()

Elijah Newren (11):
fast-export: convert sha1 to oid
git-fast-import.txt: fix documentation for --quiet option git-fast-export.txt: clarify misleading documentation about rev-list
args
fast-export: use value from correct enum
fast-export: avoid dying when filtering by paths and old tags exist
fast-export: move commit rewriting logic into a function for reuse
fast-export: when using paths, avoid corrupt stream with non-existent
mark
fast-export: ensure we export requested refs
fast-export: add --reference-excluded-parents option
fast-import: remove unmaintained duplicate documentation
fast-export: add a --show-original-ids option to show original names

 Documentation/git-fast-export.txt |  23 +++-
 Documentation/git-fast-import.txt |  23 +++-
 builtin/fast-export.c             | 190 +++++++++++++++++++++---------
 fast-import.c                     | 166 ++------------------------
 t/t9350-fast-export.sh            |  80 ++++++++++++-
 5 files changed, 268 insertions(+), 214 deletions(-)

 -:  ---------- >  1:  4c3370c85f fast-export: convert sha1 to oid
 1:  8870fb1340 =  2:  6ffa30e3c7 git-fast-import.txt: fix documentation for --quiet option
 2:  16d1c3e22d =  3:  1e278f009a git-fast-export.txt: clarify misleading documentation about rev-list args
 3:  e19f6b36f9 =  4:  9d7b2aef49 fast-export: use value from correct enum
 4:  2b305561d5 !  5:  b65a591d4d fast-export: avoid dying when filtering by paths and old tags exist
    @@ -29,7 +29,7 @@
     -					     oid_to_hex(&tag->object.oid));
     +				if (!p->parents) {
     +					printf("reset %s\nfrom %s\n\n",
    -+					       name, sha1_to_hex(null_sha1));
    ++					       name, oid_to_hex(&null_oid));
     +					free(buf);
     +					return;
     +				}
 5:  607b1dc2b2 !  6:  dde52c9cb6 fast-export: move commit rewriting logic into a function for reuse
    @@ -47,7 +47,7 @@
     -					break;
     -				if (!p->parents) {
     -					printf("reset %s\nfrom %s\n\n",
    --					       name, sha1_to_hex(null_sha1));
    +-					       name, oid_to_hex(&null_oid));
     -					free(buf);
     -					return;
     -				}
    @@ -55,7 +55,7 @@
     +			p = rewrite_commit((struct commit *)tagged);
     +			if (!p) {
     +				printf("reset %s\nfrom %s\n\n",
    -+				       name, sha1_to_hex(null_sha1));
    ++				       name, oid_to_hex(&null_oid));
     +				free(buf);
     +				return;
      			}
 6:  ec1862e858 !  7:  d9b2e326f0 fast-export: when using paths, avoid corrupt stream with non-existent mark
    @@ -35,7 +35,7 @@
     +				 * it.
     +				 */
     +				printf("reset %s\nfrom %s\n\n",
    -+				       name, sha1_to_hex(null_sha1));
    ++				       name, oid_to_hex(&null_oid));
     +				continue;
     +			}
      			printf("reset %s\nfrom :%d\n\n", name,
 7:  9da26e3ccb !  8:  9ddb155a70 fast-export: ensure we export requested refs
    @@ -97,7 +97,7 @@
      		case OBJ_TAG:
      			handle_tag(name, (struct tag *)object);
     @@
    - 				       name, sha1_to_hex(null_sha1));
    + 				       name, oid_to_hex(&null_oid));
      				continue;
      			}
     -			printf("reset %s\nfrom :%d\n\n", name,
    @@ -114,7 +114,7 @@
     +				 * like a ref deletion to me.
     +				 */
     +				printf("reset %s\nfrom %s\n\n",
    -+				       name, sha1_to_hex(null_sha1));
    ++				       name, oid_to_hex(&null_oid));
     +				continue;
     +			}
     +
 8:  7e5fe2f02e !  9:  595d2e5d30 fast-export: add --reference-excluded-parents option
    @@ -117,9 +117,9 @@
     +			printf(":%d\n", mark);
      		else
     -			printf("merge :%d\n", mark);
    -+			printf("%s\n", sha1_to_hex(anonymize ?
    -+						   anonymize_sha1(&obj->oid) :
    -+						   obj->oid.hash));
    ++			printf("%s\n", oid_to_hex(anonymize ?
    ++						  anonymize_oid(&obj->oid) :
    ++						  &obj->oid));
      		i++;
      	}
      
    @@ -138,16 +138,16 @@
     +				 * just means deletion of the ref.
      				 */
     -				printf("reset %s\nfrom %s\n\n",
    --				       name, sha1_to_hex(null_sha1));
    +-				       name, oid_to_hex(&null_oid));
     +				if (!reference_excluded_commits) {
     +					/* delete the ref */
     +					printf("reset %s\nfrom %s\n\n",
    -+					       name, sha1_to_hex(null_sha1));
    ++					       name, oid_to_hex(&null_oid));
     +					continue;
     +				}
     +				/* set ref to commit using oid, not mark */
     +				printf("reset %s\nfrom %s\n\n", name,
    -+				       sha1_to_hex(commit->object.oid.hash));
    ++				       oid_to_hex(&commit->object.oid));
      				continue;
      			}
      
    @@ -156,7 +156,7 @@
      			     N_("Apply refspec to exported refs")),
      		OPT_BOOL(0, "anonymize", &anonymize, N_("anonymize output")),
     +		OPT_BOOL(0, "reference-excluded-parents",
    -+			 &reference_excluded_commits, N_("Reference parents which are not in fast-export stream by sha1sum")),
    ++			 &reference_excluded_commits, N_("Reference parents which are not in fast-export stream by object id")),
     +
      		OPT_END()
      	};
 9:  14306a8436 = 10:  2686246a89 fast-import: remove unmaintained duplicate documentation
10:  72487a61e4 ! 11:  b78d548e7d fast-export: add a --show-original-ids option to show original names
    @@ -141,9 +141,9 @@
     @@
      		OPT_BOOL(0, "anonymize", &anonymize, N_("anonymize output")),
      		OPT_BOOL(0, "reference-excluded-parents",
    - 			 &reference_excluded_commits, N_("Reference parents which are not in fast-export stream by sha1sum")),
    + 			 &reference_excluded_commits, N_("Reference parents which are not in fast-export stream by object id")),
     +		OPT_BOOL(0, "show-original-ids", &show_original_ids,
    -+			    N_("Show original sha1sums of blobs/commits")),
    ++			    N_("Show original object ids of blobs/commits")),
      
      		OPT_END()
      	};

2.19.1.1063.g1796373474.dirty