app-arch/tarsync: 0.2.1-r2 for symlink support

Bug: https://bugs.gentoo.org/815823
Package-Manager: Portage-3.0.28, Repoman-3.0.3
Signed-off-by: Zac Medico <zmedico@gentoo.org>

2 files changed, 173 insertions, 0 deletions

diff --git a/app-arch/tarsync/files/tarsync-0.2.1-symlink.patch b/app-arch/tarsync/files/tarsync-0.2.1-symlink.patch
new file mode 100644
index 000000000000..cb0efd01b1ba
--- /dev/null
+++ b/app-arch/tarsync/files/tarsync-0.2.1-symlink.patch
@@ -0,0 +1,139 @@
+From 6654d41a14da2fc521e889f01669f0dbb89aef15 Mon Sep 17 00:00:00 2001
+From: Zac Medico <zmedico@gentoo.org>
+Date: Tue, 5 Oct 2021 23:21:53 -0700
+Subject: [PATCH] Symlink support
+
+Bug: https://bugs.gentoo.org/815823
+Signed-off-by: Zac Medico <zmedico@gentoo.org>
+---
+ main.c | 37 +++++++++++++++++++++++++++++++++++--
+ tar.c  | 16 ++++++++++++++--
+ tar.h  |  2 ++
+ 3 files changed, 51 insertions(+), 4 deletions(-)
+
+diff --git a/main.c b/main.c
+index 2c2da3e..448a9d0 100644
+--- a/main.c
++++ b/main.c
+@@ -257,7 +257,14 @@ main(int argc, char **argv)
+ 	// no need to seek.  cfile handles resetting streams as needed
+ 	
+ 	for(x=0; x < missing_count; x++) {
+-		if(copy_whole_file(&tar_cfh, missing[x]) != 0) {
++		if (missing[x]->type == SYMTYPE) {
++			if(copy_symlink(&tar_cfh, missing[x]) != 0) {
++				v0printf("failed transfering symlink %s\n", missing[x]->fullname);
++				exit(9);
++			}
++			continue;
++		}
++		else if(copy_whole_file(&tar_cfh, missing[x]) != 0) {
+ 			v0printf("failed transfering file %s\n", missing[x]->fullname);
+ 			exit(9);
+ 		}
+@@ -673,6 +680,8 @@ int
+ check_existing_node(const struct dirent *de, const tar_entry *t, struct stat *st)
+ {
+ 	int type;
++	unsigned char linkname[TAR_LINKNAME_LEN];
++	ssize_t linkname_len;
+ 	type = convert_lstat_type_tar_type(de->d_name, st);
+ 	if(type < 0)
+ 		return -1;
+@@ -682,6 +691,15 @@ check_existing_node(const struct dirent *de, const tar_entry *t, struct stat *st
+ 		return 2;
+ 	if(REGTYPE == type && (st->st_size != t->size || (check_mtime && t->mtime != st->st_mtime)))
+ 		return 3;
++	if (SYMTYPE == type) {
++		if ((linkname_len = readlink(de->d_name, linkname, TAR_LINKNAME_LEN)) == -1) {
++			return -1;
++		}
++		if(strncmp((const char *)linkname, (const char *)t->linkname, linkname_len) != 0) {
++			remove_node(de->d_name, st);
++			return 3;
++		}
++	}
+ 	return 0;
+ }
+ 
+@@ -703,7 +721,22 @@ enforce_owner(const char *path, const tar_entry *t, struct stat *st)
+ 	}
+ 	return 0;
+ }
+-	
++
++int
++copy_symlink(cfile *tar_cfh, const tar_entry *ttent)
++{
++	v1printf("creating %s\n", ttent->fullname);
++
++	if (symlink(ttent->linkname, ttent->fullname) != 0) {
++		v0printf("failed creating symlink %s -> %s\n", ttent->fullname, ttent->linkname);
++		return -1;
++	}
++	if(lchown(ttent->fullname, ttent->uid, ttent->gid) != 0) {
++		v0printf("failed chown'ing %s\n", ttent->fullname);
++		return -1;
++	}
++	return 0;
++}
+ 
+ int
+ copy_whole_file(cfile *tar_cfh, const tar_entry *ttent) 
+diff --git a/tar.c b/tar.c
+index 42dc8e7..514e5fb 100644
+--- a/tar.c
++++ b/tar.c
+@@ -214,8 +214,7 @@ read_entry(cfile *src_cfh, off_u64 start, tar_entry *entry)
+ 		case AREGTYPE:
+ 			entry->type = REGTYPE;	break;
+ 		case SYMTYPE:
+-			v0printf("symlinks not supported\n");
+-			entry->type = TTAR_UNSUPPORTED_TYPE; break;
++			entry->type = SYMTYPE; break;
+ 		case LNKTYPE:
+ 			v0printf("hardlinks not supported!\n");
+ 			entry->type = TTAR_UNSUPPORTED_TYPE; break;
+@@ -242,6 +241,17 @@ read_entry(cfile *src_cfh, off_u64 start, tar_entry *entry)
+ 	if(get_uid(block + TAR_UNAME_LOC, &entry->uid))
+ 		entry->uid = octal_str2long(block + TAR_UID_LOC, TAR_UID_LOC);
+ 
++	if (entry->type == SYMTYPE) {
++		name_len = strnlen((char *)block + TAR_LINKNAME_LOC, TAR_LINKNAME_LEN);
++		if((entry->linkname = (char *)malloc(name_len + 1)) == NULL){
++			v0printf("unable to allocate needed memory, bailing\n");
++			return MEM_ERROR;
++		}
++		memcpy(entry->linkname, block + TAR_LINKNAME_LOC, name_len);
++		entry->linkname[name_len] = '\0';
++		entry->linkname_len = name_len;
++	}
++
+ //	if(entry->end % 512)
+ //		entry->end += 512 - (entry->end % 512);
+ 	return 0;
+@@ -256,6 +266,8 @@ convert_lstat_type_tar_type(const char *path, struct stat *st)
+ 	if(S_ISREG(st->st_mode)) {
+ 		if(st->st_nlink == 1)
+ 			return REGTYPE;
++	} else if(S_ISLNK(st->st_mode)) {
++			return SYMTYPE;
+ 	} else if(S_ISDIR(st->st_mode))
+ 			return DIRTYPE;
+ 
+diff --git a/tar.h b/tar.h
+index e9d9ee9..95f957c 100644
+--- a/tar.h
++++ b/tar.h
+@@ -78,6 +78,8 @@ typedef struct {
+ 	off_u64			size;
+ 	unsigned int	fullname_len;
+ 	char			*fullname;
++	unsigned int	linkname_len;
++	char			*linkname;
+ 	time_t			mtime;
+ 	uid_t			uid;
+ 	gid_t			gid;
+-- 
+2.32.0
+
diff --git a/app-arch/tarsync/tarsync-0.2.1-r2.ebuild b/app-arch/tarsync/tarsync-0.2.1-r2.ebuild
new file mode 100644
index 000000000000..295c7e7cbef1
--- /dev/null
+++ b/app-arch/tarsync/tarsync-0.2.1-r2.ebuild
@@ -0,0 +1,34 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit toolchain-funcs
+
+DESCRIPTION="Delta compression suite for using/generating binary patches"
+HOMEPAGE="https://wiki.gentoo.org/wiki/No_homepage"
+SRC_URI="mirror://gentoo/${P}.tar.bz2"
+
+LICENSE="GPL-2"
+SLOT="0"
+KEYWORDS="~amd64 ~hppa ~ppc ~x86 ~amd64-linux"
+
+DEPEND=">=dev-util/diffball-0.7"
+RDEPEND="${DEPEND}"
+
+S="${WORKDIR}/${PN}"
+
+PATCHES=(
+	"${FILESDIR}"/${P}-make.patch
+	"${FILESDIR}"/${P}-gcc5.patch
+	"${FILESDIR}"/${P}-symlink.patch
+)
+
+src_configure() {
+	tc-export CC
+}
+
+src_install() {
+	dobin tarsync #make install doesn't support prefix
+	einstalldocs
+}