[gnome-build-meta/valentindavid/eos-installer: 4/5] eos-installer: Tweak detection of valid image

[Valentin David <valentindavid src gnome org>]

commit 7ab57f74c5c42bdd8d4d7f66978762e0aa6bde65
Author: Valentin David <valentin david codethink co uk>
Date:   Thu Mar 26 16:53:53 2020 +0100

    eos-installer: Tweak detection of valid image

 elements/iso/eos-installer.bst           |  2 +
 files/eos-installer/two-partitions.patch | 63 ++++++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+)
---
diff --git a/elements/iso/eos-installer.bst b/elements/iso/eos-installer.bst
index adc3de78..45ae6fd7 100644
--- a/elements/iso/eos-installer.bst
+++ b/elements/iso/eos-installer.bst
@@ -16,6 +16,8 @@ sources:
   path: files/eos-installer/xattr-path.patch
 - kind: patch
   path: files/eos-installer/vfat-eosimages.patch
+- kind: patch
+  path: files/eos-installer/two-partitions.patch
 
 depends:
 - freedesktop-sdk.bst:bootstrap-import.bst
diff --git a/files/eos-installer/two-partitions.patch b/files/eos-installer/two-partitions.patch
new file mode 100644
index 00000000..c41181ec
--- /dev/null
+++ b/files/eos-installer/two-partitions.patch
@@ -0,0 +1,63 @@
+diff --git a/gnome-image-installer/util/gpt.c b/gnome-image-installer/util/gpt.c
+index c056769..8d23cf6 100644
+--- a/gnome-image-installer/util/gpt.c
++++ b/gnome-image-installer/util/gpt.c
+@@ -190,7 +190,7 @@ int is_eos_gpt_valid(struct ptable *pt, uint64_t *size)
+         //  invalid partition size
+         return 0;
+     }
+-    if(pt->header.ptable_count < 3 ) {
++    if(pt->header.ptable_count < 2 ) {
+         //  need at least 3 partitions
+         return 0;
+     }
+@@ -200,12 +200,6 @@ int is_eos_gpt_valid(struct ptable *pt, uint64_t *size)
+             return 0;
+         }
+     }
+-    uint64_t flags = 0;
+-    memcpy(&flags, pt->partitions[2].attributes, 8);
+-    if(!is_nth_flag_set(flags, 55)) {
+-        //  55th flag must be 1 for EOS images
+-        return 0;
+-    }
+     //  crc32 of header, with 'crc' field zero'ed
+     struct gpt_header testcrc_header;
+     memset(&testcrc_header, 0, GPT_HEADER_SIZE);
+@@ -234,17 +228,26 @@ int is_eos_gpt_valid(struct ptable *pt, uint64_t *size)
+         // invalid first partition GUID
+         return 0;
+     }
+-    if(memcmp(&pt->partitions[1].type_guid, GPT_GUID_BOOT, 16)!=0) {
+-        // invalid second partition GUID
+-        return 0;
+-    }
+-    if(memcmp(&pt->partitions[2].type_guid, GPT_GUID_LINUX_DATA, 16)!=0
+-    && memcmp(&pt->partitions[2].type_guid, GPT_GUID_LINUX_ROOTFS1, 16)!=0
+-    && memcmp(&pt->partitions[2].type_guid, GPT_GUID_LINUX_ROOTFS2, 16)!=0
+-    && memcmp(&pt->partitions[2].type_guid, GPT_GUID_LINUX_ROOTFS3, 16)!=0
+-    && memcmp(&pt->partitions[2].type_guid, GPT_GUID_LINUX_ROOTFS4, 16)!=0) {
++    int has_root = 0;
++    for (i = 1; i < pt->header.ptable_count; ++i) {
++      if (memcmp(&pt->partitions[i].type_guid, GPT_GUID_LINUX_DATA, 16)==0
++          || memcmp(&pt->partitions[i].type_guid, GPT_GUID_LINUX_ROOTFS1, 16)==0
++          || memcmp(&pt->partitions[i].type_guid, GPT_GUID_LINUX_ROOTFS2, 16)==0
++          || memcmp(&pt->partitions[i].type_guid, GPT_GUID_LINUX_ROOTFS3, 16)==0
++          || memcmp(&pt->partitions[i].type_guid, GPT_GUID_LINUX_ROOTFS4, 16)==0) {
+         // invalid third partition GUID
+-        return 0;
++        uint64_t flags = 0;
++        memcpy(&flags, pt->partitions[i].attributes, 8);
++        if(!is_nth_flag_set(flags, 55)) {
++          //  55th flag must be 1 for EOS images
++          continue ;
++        }
++        has_root=1;
++        break ;
++      }
++    }
++    if (!has_root) {
++      return 0;
+     }
+ 
+     if (size != NULL) {