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author | Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk> | 2019-11-12 14:27:06 +0000 |
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committer | Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk> | 2019-11-12 15:43:14 +0000 |
commit | dfd8c45a98f82c69cad7a622016aa70210b025c5 (patch) | |
tree | e01971c0b3a464556a6aefa19fcb0f337445fe63 /tools/e2fsprogs | |
parent | 6becc37f33be4c2f2b5d58467bdda41c251d9e2e (diff) | |
download | upstream-dfd8c45a98f82c69cad7a622016aa70210b025c5.tar.gz upstream-dfd8c45a98f82c69cad7a622016aa70210b025c5.tar.bz2 upstream-dfd8c45a98f82c69cad7a622016aa70210b025c5.zip |
build: image: posix compatibility cut v head
Replace 2 instances of non posix use of 'head' with posix compliant
'cut'.
'head -c n' cuts 'n' bytes from the passed string and happens to work on
Linux & Mac OS X even though '-c' is not posix.
'head --bytes n' does the same thing and happens to work on linux but
not on Mac OS X and is also not posix.
'cut -b1-8' cuts the first 8 bytes from the passed string and is posix
compliant, hence works on Linux & Mac OS X.
Our usage of 'head --bytes' was particularly unfortunate since it was
used to calculated the RootFS UUID passed to grub - the net result being
a non-functioning system waiting for the root file system to appear.
Thanks to karlp, ynezz & others for pointers on solving this.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Diffstat (limited to 'tools/e2fsprogs')
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