1 files changed, 75 insertions, 0 deletions
diff --git a/fpga/usrp3/tools/scripts/git-hash.sh b/fpga/usrp3/tools/scripts/git-hash.sh
new file mode 100755
index 000000000..ed8d7963f
--- /dev/null
+++ b/fpga/usrp3/tools/scripts/git-hash.sh
@@ -0,0 +1,75 @@
+#!/bin/bash
+
+function help {
+    cat <<EOHELP
+Utilities to read/write the git hash for the project.
+
+The script will attempt to get info in the following order:
+- Using a git command
+- Using a hash file (if speficied by user)
+- Otherwise hash = 0xFFFFFFFF
+
+Usage: $0 [--help|-h] [--write] [--hashfile=HASH_FILE]
+
+--hashfile : Location of git hash file [project.githash]
+--write    : Write the git hash to HASH_FILE in the Ettus 32-bit register format
+--help     : Shows this message
+
+EOHELP
+}
+
+hashfile="project.githash"
+write=0
+for arg in "$@"; do
+    if [[ $arg == "--help" ]]; then
+        help
+        exit 0
+    elif [[ $arg =~ "--hashfile="(.*) ]]; then
+        hashfile=${BASH_REMATCH[1]}
+    elif [[ $arg =~ "--write" ]]; then
+        write=1
+    fi
+done
+
+# Default hash value (failsafe)
+ettus_githash32="ffffffff"
+
+if [[ $write -eq 0 ]]; then
+    git_success=0
+    # First attempt: Use git
+    if [[ $(command -v git) != "" ]]; then
+        # Attempt to get hash from git.
+        # This command will fail if we are not in a git tree
+        short_hash="$(git rev-parse --verify HEAD --short=7 2>/dev/null)" && git_success=1
+        if [[ $git_success -eq 1 ]]; then
+            # Check if tree is clean. If yes, the top 4 bits are 0
+            if (git diff --quiet 2>/dev/null); then
+                ettus_githash32="0$short_hash"
+            else
+                ettus_githash32="f$short_hash"
+            fi
+        fi
+    fi
+    # Second attempt: Read from file if it exists
+    if [[ $git_success -eq 0 ]]; then
+        if [[ -f $hashfile ]]; then
+            ettus_githash32=$(cat $hashfile)
+        fi
+    fi
+    echo ${ettus_githash32}
+    exit 0
+else
+    # Require git
+    command -v git >/dev/null || { echo "ERROR: git not found"; exit 1; }
+    # Get hash from git
+    short_hash="$(git rev-parse --verify HEAD --short=7 2>/dev/null)" || { echo "ERROR: Not a git tree"; exit 2; }
+    # Check if tree is clean. If yes, the top 4 bits are 0
+    if (git diff --quiet 2>/dev/null); then
+        ettus_githash32="0$short_hash"
+    else
+        ettus_githash32="f$short_hash"
+    fi
+    echo $ettus_githash32 > $hashfile
+    echo "INFO: Wrote $ettus_githash32 to $hashfile"
+    exit 0
+fi