[PATCH 2/2] filter-branch: Handle rewritting (very) old style tags which lack tagger

From: Ian Campbell <ijc@hellion.org.uk>
Date: Aug 8, 2017, 08:06 UTC
Message-ID: <20170808080620.9536-2-ijc@hellion.org.uk>
In-Reply-To: <1502179560.2735.22.camel@hellion.org.uk>

Such as v2.6.12-rc2..v2.6.13-rc3 in the Linux kernel source tree.

Insert a fake tag header, since newer `git mktag` wont accept the input otherwise:

    $ git cat-file tag v2.6.12-rc2
    object 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
    type commit
    tag v2.6.12-rc2

    Linux v2.6.12-rc2 release
    -----BEGIN PGP SIGNATURE-----
    Version: GnuPG v1.2.4 (GNU/Linux)

    iD8DBQBCbW8ZF3YsRnbiHLsRAgFRAKCq/TkuDaEombFABkPqYgGCgWN2lQCcC0qc
    wznDbFU45A54dZC8RZ5JxyE=
    =ESRP
    -----END PGP SIGNATURE-----

    $ git cat-file tag v2.6.12-rc2 | git mktag
    error: char76: could not find "tagger "
    fatal: invalid tag signature file
    $ git cat-file tag v2.6.13-rc4 | git mktag
    7eab951de91d95875ba34ec4c599f37e1208db93

Signed-off-by: Ian Campbell <ijc@hellion.org.uk>
---
 git-filter-branch.sh | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index d07db3fee..6927aa2da 100755
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -540,6 +540,9 @@ if [ "$filter_tag_name" ]; then
 			new_sha1=$( ( printf 'object %s\ntype commit\ntag %s\n' \
 						"$new_sha1" "$new_ref"
 				git cat-file tag "$ref" |
+				awk '/^tagger/	{ tagged=1 }
+				     /^$/	{ if (!tagged && !done) { print "tagger Unknown <unknown@example.com> 0 +0000" } ; done=1 }
+				     //		{ print }' |
 				sed -n \
 				    -e '1,/^$/{
 					  /^object /d

-- 
2.11.0